both magazine state R IUJNN L art pleased present uniqu report As will see author brought work home him TAILSPIN Flat spin other performed deliberate tailspins some time during very rapidly nose-high attitude Generally related terms phrases associated sport fun flying session Occasionally attempts recover useless model important hut little understood area airplane spin begunusually anew design non- crashes Rare unusual No Mysterious flight Most us fly RC models have standard styling model will begin rotate Yes Lest modelers feel lonely designers About release model 2-in span PSU-1 0~rvihg spin test operation tinyPenn State University Dave prepares flickDave retrieves PSU-1 through hatch model plainly seen through windowleft wing tiptunnel bottom certainly tiny 20 Model Aviation full-scale aircraft occasionally experience same dilemma Perhaps can imagine results study research aircraft tailspins has subject much energetic effort research teams ofthe valuable facilities research type spin tunnel concept involves wind tunnel standing vertically air being drawn upward fan mounted top Models launched whirling motion like frisbee rising air within spin tunnel fan rpm adjusted just balance descent rate model being tested result opportunity closely study motion behavior model Research facilities nature quite rare being two free world NASA has Langley Field Virginia other located France NASA spin tunnel measures twenty feet across test chamber usual model size about two feet wingspan models equipped RC operate controls thus making possible study recovery behavior work NASA-Langley am often exposed spin-tunnel tests have become quite fascinated very safe method testing critical motions model airplanes Lacking priority compete testing time ADJUST GAP TO CALIBRATE RELAY COIL C7j37ORTH MAGNET 3N DIA1/8 THICK WOOD OR PLASTIC6O NI1N34A 0 PM 0 aN magnetic tachometer made Radio Shack parts Magnets glued plastic disk glued fan assembly Relay coil mounted wood cross member position coil tweaked achieve desired output meter C B H9 10 rH B25 RADIUS INSIDE 3 fA TUNNEL CROSS SECTIONS ALL DIMENSIONS ARE INSIDE tunnel made cardboard Plexiglass windows hinged strapping tape Masking tape liberally used hold things together along Titebond glue II 3 lur lower area rapidly spinning Beechcraft 33 right-turn spin RELAY COIL 8KfL vi IOmF c-c I5 F 15BB // AA / rirai evaion moaels aii Z- Span lop Bottom Bede BD5-J Cessna 150 Piper Arapahoe Penn State PS U-i 30 05 3M I--5 i ASIC WINC WFH urn / V /1/ / ESi VELOCITY 20 0 30 40 graph shows effect leading edge flaps wing lift Full-size airfoil top right NASA spin tunnel began wonder about constructing very own having budget federal agency began realize spin tunnel would have just bit smaller perhaps little less elegant search house shop tumed up floor fan 20-inch diameter blades variable transformer controlled just fine Finding contours wind tunnels small sizes rather tricky business chose cardboard structural material avail able wherever grocery stores found easily modified miniature spin tunnel scale model larger unit specific design tailored job intended detailed construction article therefore will speak general terms omit detailed construction information spin tunnel fashioned cardboard has Plexiglass viewing windows used jigsaw cut launching hatch window hinged strapping tape Masking tape used jiberally hold things together along Titebond glue Strips wood support fan unit top well providing bottom frame legs flow-straightener grid bottom too may cardboard silk-like polyester fabric net stretched across grid serves two purposes smooth airflow catch models bottom rather large hatch cut bottom cone purpose retrieving 22 Model Aviation 8 6 CL / f. / oz U UlO rz z 0 C I1 0 0 I1 IThe launch padd9e Model placed nose facing launcher held theopentrapdoor launching using finger same hand hold open door Tools used making miniscule planes scales Iauncn paddle Models Mooney M2OC left four 2- span Yankees variety tail configurations EAA biplane 0-1 gram scale6-in machiniaL rule ulCyluUllu models desk lamp borrowed son s room used light jAterior painted interior flat black could see models spray-painted outside silver aerosol canlooks better assorted grocery cartons tachometer shown constructed parts purchased local Radio Shack store See sketch schematic details magnets glued plastic disk glued fan assembly mounted relay coil wooden cross-member tweaked position coil achieve desired output meter As spin tunnel began taking shape became obvious size models would quite small experience industrial test models aware need properly scale weight balance inertias dimensions spin test models measure values another matter have found six-inch long machinists ruler best friend measur ing tiny model dimensions can bought graduations / 100-inch found wherever machinist tools sold Try Sears Roebuck Measuring weight another problemi General ly complete model will weigh between one-tenth N I IIII liii I I Ifer 800 600 1 0 20C 0 j K MINIATURE SPIN TUNNEL MAXIMUM OUTPUT 21FPS AT 980 RPM inL --II 12 16 VELOCITY RPS graph provides values air velocity ft/sec read against rpm fan gram gram depending model scale prototype weight solution construct scales job simple spring wire scale shown handy weighing parts quickly during construction exotic beam scale super weighing complete models Check drawings specific details scale custom job Construction follows same theme specific variations noted Generally used Hot Stuff type glue throughout bonding 20 halta wood structure beam scale pivots two strips copper wire resting new razor blade no nicks please Calibration tiny scales accomplish ed follows length 1/32-in wire solder trimmed until weighed exactly gramlocal druggist piece measured length recorded Short pieces solder cut length one-tenth long 1/100 full length gave calibration weights Balance Notes 1 balsa 2 Assemble Hot Stuff 3 Two slide weights ten times weight other 4 Lead counterweight just balances 5 Maximum range determined slide-weights Dave sets balance 1 gram pan both maximum travel Again reduce size drawing Bottom piece plus 3/16 sq right measures B inches 1/32 PAN I/16X 1/16 / STOP PINS 0 3116x 3/16 3/16X 3/40 V March 1980 23 0 Three 2-in canards top bottom Zonker Rutan Variviggen Rutan VariEze COUNTER WEIGHTSLIDE WEIGHTS -TWO WIRE BEARINGS DBR-2 Special hypothetical full-scale prototype Span 25 ft area 104 sq ft. weight 1500 lbs Model 1/100th scale Span 3 in. area 15 sq weight 68 grams CG 25% chord As shown model should have flat no-recovery spin mode moving stab higher T-tail interesting effect would immediately noticed .-i ri-rn PANJ} 1132 H 1/32 X 3/16 x 112 ALL WOCO IS BALSA I/ l14X 3/4e BASE WIRE WITHOUT PAN 3/l6aX 3/16 gram one-tenth gram 1/100 gram used calibrating marks various scale bars Checking balance tiny models also requires special set-up None old fingertip under wingtips use 020-in music wire length wire passing through fuselage desired balance location Two lengths wire glued strip wood model suspended across handiest material ballast thin lead cut small slivers pointed shapes push nose needed trimming lead until model hangs level balance wires aircraft spinning moments inertia about various axis have major influence spin behavior value have developed proper technique measur ing would appreciate suggestions present method construct models simulate empty weight prototype airplane add weight center model until matches scale gross weight prototype Additionally distribution mass prototype must considered since twinengine design tip tanks will very different single-engine planes respect Construction dwarf scale models much less difficult first appearances Real ly patient reader will share some techniques hope shedding some light matter tools expensive exotic yet has purpose Tweezers nearly essential really sharp knife prefer Uber Skiver No 11 blade however really sharp X-Acto will job too Good sharp single-edge razor blades always handy especially broken special shapes pliers hollow out fuselages models X-Acto gouges great usual sanding blocks out question use sandpaper glued onto coffee stirring sticks can made up shapes different sandpaper grits six-in ruler just right measurements magnifying glass real asset Any other tools equipment found under miscellaneous pins razor saw etc Balsa wood favorite material far just has lightest easiest working material available tiny models require little sheet seems last forever am real choosy wood selecting clear-grained unwarped extremely light stock favorite Sig Contest Balsa although plenty Continued page 96 Scale calibrated short lengths wire solder Ex 125 1/32 solder equals 1 gram 125 equals 01 gram could show drawing full-size prepared author dimensions base piece rear upright both 4 inches 24 Model Aviation Beechcraft Sundowner 0-25 gram springwire scales Dave dreams someday finding RC system fit little aircraftJ DRAWN FULL SIZE QL ii L OPTIONAL TAPE FLAPS QHARP A-A CORNER 3FA -LA II 0 5 dii SPORT AEROBATICS Ron Van Putte COUPLE months ago 1 mentioned instructor problem some clubs have tunately club has excellent instruction program beginners largely due enthusiasm club instructors feature program other clubs might like copy awarding solo certificates novice pilot instructor club meeting Blank certificates printed up club president Ed Moorman AMA DistrictS AVP North Florida Ed types appropriate information about novice pilot gives completed certificate instructor presentation Both novice pilots instructors like idea club might like try too Good instructors leave helpful hints students reading club newsletters ModelAviations publisher Carl Wheeley sends came across great article Ed Cocciola Cedar Rapids low Skyhawks newsletter Logbook good advice contained Eds article bears repeating printing slightly edited version Notes Novices Since 1973 have seen lot Skyhawks pass through club Some made quite contribution own way talking about couple dont mean slight ofthose dont mention also made contribution said have reason bringing up particular ones wanting solo summer still needed someone take off after wandering around sky fur 10 15 minutes Id yell someone land Sound familiar bet doing since summer before day plane starting spin trying figure out should giving left turn right turn Bill Birkey grabbed trans mitter straightened Out regained lost altitude still wasnt flying less three mistakes high done count less times before Jim Clark once grabbed transmitter pulled Falcon 56 out spin about four feet off deck day stood watching crash However Bill Birkey did something different stuck handed back transmitter day said shes coming Ed watch low wing straighten up just push stick low wing Now isnt simple time trying mentally sort out plane coming turning toward right really planes left means have push stick? Oh hell has crashed now anyway quick easy just push toward low wing need know left right Maybe thats problem Right quit getting much trouble began really enjoying flying wasnt getting closer making landings day later summer George Moger came over asked flying plane flying up doing usual aimless wandering routine did know what meant explained wasnt leading airplane just following around keep ing range wasnt trying anything keep crashing plane went wanted within radio range George said want solo have start making plane go directly point another fly predetermined route wandering chang ing course have accomplish order able set up landing approach course stay landing simply matter flying approach pattern lower lower until finally can just cut throttle let settle runway Well next few weeks flying pattern constantly remember first time came down runway 15 feet air thought skimming deck George usually would still yell him someone land thought fuel getting low day yelled George entered base leg said Cut throttle As did turned hand him transmitter walking away yelled just said Land kept walking Falcon rolled stop still its wheels piece happiest guy Linn County George Bill club now other guys around can much George Bill Jim others did Just give chance Happy landings Thanks Ed beginners can put selves article benefit Maybe epitaph some airplanes can postponed Speaking epitaphs John Thomas editor West Orange Sunfliers Orlando FL newsletter Sun beam published following RIP lies airplane red blue white turned left should have turned right last two weeks have enjoying new exciting phase radio control modeling purchased Kraft Eleck Rider motorcycle KP-2A radio systern After about three hours assembly cycle operating Continued page 96 26 Model Aviation Van Putte Mustang sports license plate 10 conTests aii over oeep uuth Ron says honk wave see car give him call CB airplanes may get crack two out coupie 01 keep going Celastic patches decorated Magic Marker ld Roberts ship looks luxurious nocing ne put iii painted interior adhesive sprinkled flocking Purchasing R/C Aircraft easy YOUNIQUE AT Hobby Capital keep large ready supply af Custom-Bilt RC Aircraft Kits Engines RC Units times And. thanks ta years af experience dealing people sections af US. prepare special ane-of-a-kind RC Aircraft far special one-ofa-kind RC Flyer wha demands unique laok express tastes Chances youll find custom paint finish exquisite detailed cockpit interiors glassed engine compartments real scale wheels custom grilled nose section will knock socks offi. youll probably never see another like cause Hobby Capitol expert stressed preparation goes far beyond standard checkout RC shoppers turning up increasing numbers convenient showroom because word out. outstanding buys service finest selection unique RC Aircraft anywhere its HOBBY CAPITOL Old Ignition Trode4n Buy sell old time ignition engines Box up what have send us honest appraisal could worth new proportional set have engines can also start collection welcome built-up airplanes used proportionals old time ignition engines Come trade us lop dollar paid Built Order Rons Kt stock choose Its s400OO Pipet Tri-Poce Quarter Scale 89 wingspan 42 Sq Ft detailed plans $1699 PR Send $i00 self addressed stamped envelope far detailed list Built-Up R/C Models ond 50% Sale Hobby Capitol 46 N Oak St Ventura CA 93001 Phone 805 643-7616 / 642-8465 efforts promote models look fly like full-size counterparts may finally blossom ing full bloom Las Vegas TOC thing andthe IMAC organization promoting aerobatic models have copies full scale machines CAP addition pack hopefully add pleasure others just did Glen Hazel Sig gang up Iowa doing share promote IMAC philosophy decide build CAP sashay up next year enjoy bash put benefit us modelers RC Aerobatics/Van Putte continued page 26 street front house said technique faultless beginning Eleck Rider performed perfectly Id half truthful cycle did perform perfectly technique left lot desired initially poor driving ability its advant ages Whenever lost control cycle spun out ran curb dashed under car clobbered mailbox post demonstrated durability system After two weeks hard use 13 novice drivers cycle has scuff marks acetate fairing evidence its hard life its tough first questions someone has never seen perform asks difficult keep upright answer very simple Its easy Unless driver does something upset cycle will happily drive forever straight line want turn thats different story Eleck Rider requires coordination ofthrottle steering negotiate turn tighter turn coordination required Steering accomplished turning front forlc done tilting fork front wheeVfork castered free turn direction So does cycle steer Very nicely thank extremely stable too have hit number obstructions include rocks manhole cover cracks pavement acorns jumping ramp etc very few exceptions cycle has stabilized itself motored electric motor operated servodriven rheostat throttle stick has spring return center Forward movement stick provides proportional forward speed Pulling back stick causes motor function like generator acts brake dead man throttle feature nice beginners since cycle will stop itself let go stick best place leam operate Eleck Rider large smooth area like parking lot Once driving proficiency achieved large area smaller places can tried out cycle started holding upright advancing throttle holding stable briefly acceler ates Initial operation should about R3 throttle gentle tums should attempted Sharper turns must accomplished throttling back turning cycle throttling up about halfway through turn slower cycle sharper turn can cycle will fall over gets too slow key success proper coordination throttle takes proficient RC pilot less half hour learn operate Eleck Rider Part problem RC newcomers will have deciding way move stick cycle heading toward An experienced pilot has advantage area because has already learned control airplane coming toward him Unfortunately old rule stick toward low wing doesnt help much motorcycle Am enjoying Eleck Rider Well weekday huny home work drive 30 minutes before gets dark weekends tough get chores done before taking out So far havent able racing others because first kid block have However several others way will probably racing around water-filled milk jugs local parking lot read Get case youve wondering next Pattern Problem Month will appear answer ts receive someone response request problems has very underwhelming Ron Von Puttg 12 Connie Drive Slzalimart FL 32579 Spin Tunnel Robelen continued page 24 good brands really am stuck Hot Stuff type glue truly superior Very light weight will never warp thinnest tail surface course dries immediately other brands Zap Jet etc areallfine Imsure Ijusthavenothadmuch experience Various finish techniques useful Sometimes apply coat sanding sealer Testors Hot Fuel Proof trim color am also pleased results using spray dyes use Deep-flex brand spray can found local variety store usual method construction start fuselage lightly tack glue two blocks together part vertical centerline first shape top view side view followed careful shaping 96 Model Aviation MAMMOTH SCALERS nce have available reeglete line enganeasmts alal eufflers enat 90 So 15 engines srsis OIaDRA WEBRA ar etc Wgite call far catalog emS price info Quarter Headquarters U 12321 5am raulmCaS4iI2 334,, contours After shaping pop blocks apart hollow out inside gouge blades nose area may left solidz however tail aft wing must quite light wing shaped suitable thickness balsa sheetfirst cutting planform forming airfoil finally setting dihedral place wings usually mounted cutting away appropriate area fuselage glueing wing place fairing necessary tail surfaces must very light therefore attempt form airfoil shapes etc Rather sand piece sheet balsa quite thin 0 10inch cut tail pieces fastened place tiny drops Hot Stuff finish may now applied after model ready balancing addition al ballasting scale weight etc As rule have able set control surfaces models moistening lightly bending have yet found need hinging controls nor could have built models good starting point controls set elevator up rudder spin direction ailerons against spinfor example up elevator left rudder right aileron aid launching made small paddle dowel handle wire rim fine mesh fabric center model placed nose facing launcher held open trap-door launching using finger same hand hold trap-door open model launched gently flicking wing tip finger other hand both starts model spinning propels tunnel throat trap-door allowed fall shut tunnel rpm adjusted balance spinning model Take word it whole lot easier show try describe old expression practice makes perfect really applies things happen pretty quickly As much research things always simple appear case am referring specific phenomena encounter ed tiny models cases models would maintain spin given set conditions though certain should looking answers already assuming lack agreement due Reynolds Number some other scaling effect Disturbing was still pleased overall effect models would spin smoothly fine demonstrations etc Playing hunch evening fastened strip scotch tape wing leading edges problem models form crude flap result dramatic model would spin readily rate spin spin angle-of-attack etc quite close what expected Fine tuning trimming tape produced flap about one-half wingspan one-tenth chord tape flaps place almost models will spin expected considering general lack knowledge prototype behavior effort better understand phenomena constructed small wing mounted force measurement scale another small wind tunnel Runs made tape flaps place As lift curves show lift developed especially higher angles attack such encountered tail spin will try draw lofty conclusions thisjust pass along data As photographs would indicate models patterned after current general aviation lightplanes has both good bad Bad because general lack information about spin behavior full scale aircraft prevents direct comparisons However category airplanes has areas March 1 980 97 Al Superiority HOT STUFE FOR THE MODELER WHO MUST HAVE MAXIMUM STRENGTH DEEP PENETRATION LIGHTEST WEIGHT VERSATILITY UNCOMPROMISING QUALITY INSTANTLY TIP BOOKLETS FREE ATOR YOUR HOBBY DEALER SEND SELF ADDRESSED STAMPED ENVELOPE TO iiGtfldO PROPELLERS Made polyester boil color Go GRISH propeller True helical pitch airfoil win-power Sizes pitches styles needs AT YOUR DEALER 2 Blade Tractor 5-3each 545354USc 63645Cc 747678Sc 8486887Cc 949-697 9810410-6Sc 11411-6118 *1 12412612-6815 2 Blade Pusher 5b3 5-4 6-36-4 Nc 8-6 Sc 9-610-681 3 Blade Tractor 53 6-364Nc 3 Blade Pusher 63Nc Metallic- Color Tractor 7678*1 8688*13 96 061041N Pusher06*15 design sensitivity small changes make dramatic differences tailspin behavior sensitive areas include wing airfoils wing location high wing low wing tail design fuselage contours especially behind wing control surface deflections C G location mass distri bution etc no perfect size spin models started models about two-in wingspan very convenient launching ease staying away tunnel walls recently have begun build larger models three-in wingspan have advantages easier construction possible interchangeable parts well being likely meet ballpark inertia requirements main drawback relates launching tunnel larger models tend strike walls easily sensitive design areas especially tailspin motions decided design own general aviation research modeL model theDBR-2 Special includes blend GRISH LARGE WOOD PROPELLERS HARDWOOD too hard minimizes chance costly plane engine damage True pitch airfoil fully finished balanced ready coating 3/8 BOREALL SIZES IN18 57 6 8 & 10 PITCH 20 8 22 10 24 13 RIGHT HAND TRACTOR BROS GRUSH ST JOHN INDIANA 46373 shapes found modern full-scale designs As drawn model portrays force set-up will tend have flat no-recovery spin mode may changed altering areas modeL have made several tail assemblies T-tail etc alone make dramatic differ ences spin behavior using basic model changing just piece time possible analyze results proposed design changes introducing too variables once also very interesting build actual scale models familiar airplanes Please very cautious about drawing conclusions live era product liability lawsuits simply amazing would want ever take chance falsely accusing brand airplane usual obstacle building scale models still applies namely lack information scrounging around have found several sources very helpful Jones Pocket Book Series great reference source some company brochures also excellent three-view drawings published various magazines Mass data typically hard find probably will require cross-referencing Generally published drawings larger desired larger cities will hae some photocopy machine capable making copies reduced size very 100 Model Aviation ALWAYS AVAILABLE AT YOUR HOBBY DEALER Satellite City PO Box 836 Simi CA 93065 805 522-0062 1 / 3 NEW SIZE IN 8 & 10 PITCH 26 $16 MINIATURE SPIN TUNNEL Model Test comparisons Models Approx 2 Wingspan ModelTunnel RPMSpin RateSpin AOA R PSDegrees Yankee #4 Tail410 0 85 Yankee #6 Tail610 50 ankee V Tail530 50 55 Yankee r Tail510 0 55 Sundowner520 30 35 PSU-1380 0- 75 BD-55580 5-80 BDSL480 5-80 F4U corsair580 5 50 cessnalso610 25-30 Piper Twin420 5 70 Variviggen520 30- 35 Zonker480Oscillatory VariezeNO SPIN handy shrinking job Photographic techniques would fine available use handy pocket calculator reduce dimensions draw plan grid paper As rule small detail may safely omitted antenna door latches etc changing results According tests NASA spin tunnel landing gear does affect model spin behavior measurable way reason leave delicate parts off models always refinements possible type project method measuring air velocity would real asset would method easily measuring spin rate models have experimented strobe light Seemingly no end variations possible project sort will always looking opportunities improve equipment techniques involved Maybe some day can find RC system tiny enough fit models could observe recovery behavior also Todays dream to-1 morrows project has theme through effort anyone would like correspond will try answer mail especially selfaddressed stamped envelope Happy spinning REFERENCES I Janet Pocket Book Series such Light Aircraft etc 2 Burt S M. Jr Bowman J S. Jr white E L SpinTunnel Investigation Spinning Characteristics Typical Single-Engine General Aviation Airplane Designs NASA Technical Paper 1009 September 1977 3 Beechcraft Today company hrochnre 4 Powers Bradford Ahout Size Model riarian January 1978 5 Powers Bradford Lets Talk About Reynolds Numbers Model Aviation February 1979 RC Pylon/Hager continued page 27 100% profit ideas get members wife bake cookies cupcakes brownies items sell very well 100% profit Always buy large size jars catsup mustard relish creamer sugar coffee Buy cups case What isnt used can saved another contest Dont sell items too high price want make profit dont overdo club can make several hundred dollars just well-run concession stand good example well-planned race annual Fort Wayne Flying Circuits Pylon Races run Jim Gager Jim club spend lot time before race day promoting As non-profit club can usually get free publicity local radio stations television helps promote sport gets public out see racing people also spend money club also gives out several hundred dollars prize money seems working year turn-out up 79 contest 28 entries Formula 36 entries Quarter Midget results Formula 11 Jim Moorehead 2 Bob Reuther 3 Dave Keats 4 Bill Johnason 5 Bob Onori 6 William Preis 7 Wayne Yeager 8 Eric Meyers 9 Al Grove 10 Art Arro Quarter Midget 1 Doug Bebensee 2 Duane Gall 3 Gail Jacobson 4 Dennis Sumner 5 Brian Richmond 6 Floyd Fitzgerald 7 Ken Heatlie 8 John Kilsdonk 9 Dave Timcoe 10 Allen Booth Any might have some ideas tips running successful race send will pass Bill Hager 4622 Bridgeport Dr Garland TX 75043 Inexpensive key word ACES new line R/C kits called Silver Series line offers unique combination value wide range versatility found todays R/C market until now cutting out biggeal costs Labor furnish kit furnish labor allows us give top-quality product inexpensive price comparable $800 radios its featuren * SERVO REVERSAL SWITCHES--With ists flip aft switch terso travel direcriae etch four psievasy channets rue reversed INDEPENDENT THROW ADJUST-On chavuels amount servo travel can cos stalled independeerty * EtETH CHANNEL ADItJST--Seeno position whea retract switch either le Up Down posirice ledepeedeutly adiastabte * TRtM LOCATtON rARtABLES-flee marion af trims us builders discrerivo cue have standard trim crossed trim cemhiaatioe two TRtM AUTI-IORITY PROORAMMABILITYBy ebasgiag plug-in lived resistors amouas remo esoursios whes tIre trims mooed programmable * DUAL RATE--Switches aed adiusemeet pats famished provide DUAL RATE up three channels EXPONENTIAL RATE OPTtONThis ptughs option provides ean-liarar servo teasel se klatioe snob movement up three vhannels 5t795 ELECTRONIC MIXER OPEIONWith plug-in modate two functices cue N k-i together tither onidirectiaerlly arhidireosioeally lSlt95 * PROGRAMMABLE PUSH BUTTON OPTION-te-tight adiustable peepeogeammed covasot surface muermena may obtained push g h $89 THE SILVER SEVEN $28495 Full ni cd system kit receiver four servos two classics Flyline Farman Moustique SEE YOUR LOCAL HOBBY DEALER send 25c catalog 34 span 020 power $1595 QUAKER FLASH single Channel nC Power free flight Y9 Wtngspan FLYLINE MODELS INC aaaa DORR AVENUE lB FAIRFAX VtAGINIA aunas 17031 5732t38 March 1980 101 Cheek wish Ane dealer metre naIl nomptate datailt crws S complete Catalogs $100 lasid $BOfo CaunMa urnl Box 511E 119W 19th. Higginsville Mo 64037 816 584-7121 COMING SOON 117e READY NOW
Edition: Model Aviation - 1980/03
Page Numbers: 20, 21, 22, 23, 24, 96, 97, 98, 99
both magazine state R IUJNN L art pleased present uniqu report As will see author brought work home him TAILSPIN Flat spin other performed deliberate tailspins some time during very rapidly nose-high attitude Generally related terms phrases associated sport fun flying session Occasionally attempts recover useless model important hut little understood area airplane spin begunusually anew design non- crashes Rare unusual No Mysterious flight Most us fly RC models have standard styling model will begin rotate Yes Lest modelers feel lonely designers About release model 2-in span PSU-1 0~rvihg spin test operation tinyPenn State University Dave prepares flickDave retrieves PSU-1 through hatch model plainly seen through windowleft wing tiptunnel bottom certainly tiny 20 Model Aviation full-scale aircraft occasionally experience same dilemma Perhaps can imagine results study research aircraft tailspins has subject much energetic effort research teams ofthe valuable facilities research type spin tunnel concept involves wind tunnel standing vertically air being drawn upward fan mounted top Models launched whirling motion like frisbee rising air within spin tunnel fan rpm adjusted just balance descent rate model being tested result opportunity closely study motion behavior model Research facilities nature quite rare being two free world NASA has Langley Field Virginia other located France NASA spin tunnel measures twenty feet across test chamber usual model size about two feet wingspan models equipped RC operate controls thus making possible study recovery behavior work NASA-Langley am often exposed spin-tunnel tests have become quite fascinated very safe method testing critical motions model airplanes Lacking priority compete testing time ADJUST GAP TO CALIBRATE RELAY COIL C7j37ORTH MAGNET 3N DIA1/8 THICK WOOD OR PLASTIC6O NI1N34A 0 PM 0 aN magnetic tachometer made Radio Shack parts Magnets glued plastic disk glued fan assembly Relay coil mounted wood cross member position coil tweaked achieve desired output meter C B H9 10 rH B25 RADIUS INSIDE 3 fA TUNNEL CROSS SECTIONS ALL DIMENSIONS ARE INSIDE tunnel made cardboard Plexiglass windows hinged strapping tape Masking tape liberally used hold things together along Titebond glue II 3 lur lower area rapidly spinning Beechcraft 33 right-turn spin RELAY COIL 8KfL vi IOmF c-c I5 F 15BB // AA / rirai evaion moaels aii Z- Span lop Bottom Bede BD5-J Cessna 150 Piper Arapahoe Penn State PS U-i 30 05 3M I--5 i ASIC WINC WFH urn / V /1/ / ESi VELOCITY 20 0 30 40 graph shows effect leading edge flaps wing lift Full-size airfoil top right NASA spin tunnel began wonder about constructing very own having budget federal agency began realize spin tunnel would have just bit smaller perhaps little less elegant search house shop tumed up floor fan 20-inch diameter blades variable transformer controlled just fine Finding contours wind tunnels small sizes rather tricky business chose cardboard structural material avail able wherever grocery stores found easily modified miniature spin tunnel scale model larger unit specific design tailored job intended detailed construction article therefore will speak general terms omit detailed construction information spin tunnel fashioned cardboard has Plexiglass viewing windows used jigsaw cut launching hatch window hinged strapping tape Masking tape used jiberally hold things together along Titebond glue Strips wood support fan unit top well providing bottom frame legs flow-straightener grid bottom too may cardboard silk-like polyester fabric net stretched across grid serves two purposes smooth airflow catch models bottom rather large hatch cut bottom cone purpose retrieving 22 Model Aviation 8 6 CL / f. / oz U UlO rz z 0 C I1 0 0 I1 IThe launch padd9e Model placed nose facing launcher held theopentrapdoor launching using finger same hand hold open door Tools used making miniscule planes scales Iauncn paddle Models Mooney M2OC left four 2- span Yankees variety tail configurations EAA biplane 0-1 gram scale6-in machiniaL rule ulCyluUllu models desk lamp borrowed son s room used light jAterior painted interior flat black could see models spray-painted outside silver aerosol canlooks better assorted grocery cartons tachometer shown constructed parts purchased local Radio Shack store See sketch schematic details magnets glued plastic disk glued fan assembly mounted relay coil wooden cross-member tweaked position coil achieve desired output meter As spin tunnel began taking shape became obvious size models would quite small experience industrial test models aware need properly scale weight balance inertias dimensions spin test models measure values another matter have found six-inch long machinists ruler best friend measur ing tiny model dimensions can bought graduations / 100-inch found wherever machinist tools sold Try Sears Roebuck Measuring weight another problemi General ly complete model will weigh between one-tenth N I IIII liii I I Ifer 800 600 1 0 20C 0 j K MINIATURE SPIN TUNNEL MAXIMUM OUTPUT 21FPS AT 980 RPM inL --II 12 16 VELOCITY RPS graph provides values air velocity ft/sec read against rpm fan gram gram depending model scale prototype weight solution construct scales job simple spring wire scale shown handy weighing parts quickly during construction exotic beam scale super weighing complete models Check drawings specific details scale custom job Construction follows same theme specific variations noted Generally used Hot Stuff type glue throughout bonding 20 halta wood structure beam scale pivots two strips copper wire resting new razor blade no nicks please Calibration tiny scales accomplish ed follows length 1/32-in wire solder trimmed until weighed exactly gramlocal druggist piece measured length recorded Short pieces solder cut length one-tenth long 1/100 full length gave calibration weights Balance Notes 1 balsa 2 Assemble Hot Stuff 3 Two slide weights ten times weight other 4 Lead counterweight just balances 5 Maximum range determined slide-weights Dave sets balance 1 gram pan both maximum travel Again reduce size drawing Bottom piece plus 3/16 sq right measures B inches 1/32 PAN I/16X 1/16 / STOP PINS 0 3116x 3/16 3/16X 3/40 V March 1980 23 0 Three 2-in canards top bottom Zonker Rutan Variviggen Rutan VariEze COUNTER WEIGHTSLIDE WEIGHTS -TWO WIRE BEARINGS DBR-2 Special hypothetical full-scale prototype Span 25 ft area 104 sq ft. weight 1500 lbs Model 1/100th scale Span 3 in. area 15 sq weight 68 grams CG 25% chord As shown model should have flat no-recovery spin mode moving stab higher T-tail interesting effect would immediately noticed .-i ri-rn PANJ} 1132 H 1/32 X 3/16 x 112 ALL WOCO IS BALSA I/ l14X 3/4e BASE WIRE WITHOUT PAN 3/l6aX 3/16 gram one-tenth gram 1/100 gram used calibrating marks various scale bars Checking balance tiny models also requires special set-up None old fingertip under wingtips use 020-in music wire length wire passing through fuselage desired balance location Two lengths wire glued strip wood model suspended across handiest material ballast thin lead cut small slivers pointed shapes push nose needed trimming lead until model hangs level balance wires aircraft spinning moments inertia about various axis have major influence spin behavior value have developed proper technique measur ing would appreciate suggestions present method construct models simulate empty weight prototype airplane add weight center model until matches scale gross weight prototype Additionally distribution mass prototype must considered since twinengine design tip tanks will very different single-engine planes respect Construction dwarf scale models much less difficult first appearances Real ly patient reader will share some techniques hope shedding some light matter tools expensive exotic yet has purpose Tweezers nearly essential really sharp knife prefer Uber Skiver No 11 blade however really sharp X-Acto will job too Good sharp single-edge razor blades always handy especially broken special shapes pliers hollow out fuselages models X-Acto gouges great usual sanding blocks out question use sandpaper glued onto coffee stirring sticks can made up shapes different sandpaper grits six-in ruler just right measurements magnifying glass real asset Any other tools equipment found under miscellaneous pins razor saw etc Balsa wood favorite material far just has lightest easiest working material available tiny models require little sheet seems last forever am real choosy wood selecting clear-grained unwarped extremely light stock favorite Sig Contest Balsa although plenty Continued page 96 Scale calibrated short lengths wire solder Ex 125 1/32 solder equals 1 gram 125 equals 01 gram could show drawing full-size prepared author dimensions base piece rear upright both 4 inches 24 Model Aviation Beechcraft Sundowner 0-25 gram springwire scales Dave dreams someday finding RC system fit little aircraftJ DRAWN FULL SIZE QL ii L OPTIONAL TAPE FLAPS QHARP A-A CORNER 3FA -LA II 0 5 dii SPORT AEROBATICS Ron Van Putte COUPLE months ago 1 mentioned instructor problem some clubs have tunately club has excellent instruction program beginners largely due enthusiasm club instructors feature program other clubs might like copy awarding solo certificates novice pilot instructor club meeting Blank certificates printed up club president Ed Moorman AMA DistrictS AVP North Florida Ed types appropriate information about novice pilot gives completed certificate instructor presentation Both novice pilots instructors like idea club might like try too Good instructors leave helpful hints students reading club newsletters ModelAviations publisher Carl Wheeley sends came across great article Ed Cocciola Cedar Rapids low Skyhawks newsletter Logbook good advice contained Eds article bears repeating printing slightly edited version Notes Novices Since 1973 have seen lot Skyhawks pass through club Some made quite contribution own way talking about couple dont mean slight ofthose dont mention also made contribution said have reason bringing up particular ones wanting solo summer still needed someone take off after wandering around sky fur 10 15 minutes Id yell someone land Sound familiar bet doing since summer before day plane starting spin trying figure out should giving left turn right turn Bill Birkey grabbed trans mitter straightened Out regained lost altitude still wasnt flying less three mistakes high done count less times before Jim Clark once grabbed transmitter pulled Falcon 56 out spin about four feet off deck day stood watching crash However Bill Birkey did something different stuck handed back transmitter day said shes coming Ed watch low wing straighten up just push stick low wing Now isnt simple time trying mentally sort out plane coming turning toward right really planes left means have push stick? Oh hell has crashed now anyway quick easy just push toward low wing need know left right Maybe thats problem Right quit getting much trouble began really enjoying flying wasnt getting closer making landings day later summer George Moger came over asked flying plane flying up doing usual aimless wandering routine did know what meant explained wasnt leading airplane just following around keep ing range wasnt trying anything keep crashing plane went wanted within radio range George said want solo have start making plane go directly point another fly predetermined route wandering chang ing course have accomplish order able set up landing approach course stay landing simply matter flying approach pattern lower lower until finally can just cut throttle let settle runway Well next few weeks flying pattern constantly remember first time came down runway 15 feet air thought skimming deck George usually would still yell him someone land thought fuel getting low day yelled George entered base leg said Cut throttle As did turned hand him transmitter walking away yelled just said Land kept walking Falcon rolled stop still its wheels piece happiest guy Linn County George Bill club now other guys around can much George Bill Jim others did Just give chance Happy landings Thanks Ed beginners can put selves article benefit Maybe epitaph some airplanes can postponed Speaking epitaphs John Thomas editor West Orange Sunfliers Orlando FL newsletter Sun beam published following RIP lies airplane red blue white turned left should have turned right last two weeks have enjoying new exciting phase radio control modeling purchased Kraft Eleck Rider motorcycle KP-2A radio systern After about three hours assembly cycle operating Continued page 96 26 Model Aviation Van Putte Mustang sports license plate 10 conTests aii over oeep uuth Ron says honk wave see car give him call CB airplanes may get crack two out coupie 01 keep going Celastic patches decorated Magic Marker ld Roberts ship looks luxurious nocing ne put iii painted interior adhesive sprinkled flocking Purchasing R/C Aircraft easy YOUNIQUE AT Hobby Capital keep large ready supply af Custom-Bilt RC Aircraft Kits Engines RC Units times And. thanks ta years af experience dealing people sections af US. prepare special ane-of-a-kind RC Aircraft far special one-ofa-kind RC Flyer wha demands unique laok express tastes Chances youll find custom paint finish exquisite detailed cockpit interiors glassed engine compartments real scale wheels custom grilled nose section will knock socks offi. youll probably never see another like cause Hobby Capitol expert stressed preparation goes far beyond standard checkout RC shoppers turning up increasing numbers convenient showroom because word out. outstanding buys service finest selection unique RC Aircraft anywhere its HOBBY CAPITOL Old Ignition Trode4n Buy sell old time ignition engines Box up what have send us honest appraisal could worth new proportional set have engines can also start collection welcome built-up airplanes used proportionals old time ignition engines Come trade us lop dollar paid Built Order Rons Kt stock choose Its s400OO Pipet Tri-Poce Quarter Scale 89 wingspan 42 Sq Ft detailed plans $1699 PR Send $i00 self addressed stamped envelope far detailed list Built-Up R/C Models ond 50% Sale Hobby Capitol 46 N Oak St Ventura CA 93001 Phone 805 643-7616 / 642-8465 efforts promote models look fly like full-size counterparts may finally blossom ing full bloom Las Vegas TOC thing andthe IMAC organization promoting aerobatic models have copies full scale machines CAP addition pack hopefully add pleasure others just did Glen Hazel Sig gang up Iowa doing share promote IMAC philosophy decide build CAP sashay up next year enjoy bash put benefit us modelers RC Aerobatics/Van Putte continued page 26 street front house said technique faultless beginning Eleck Rider performed perfectly Id half truthful cycle did perform perfectly technique left lot desired initially poor driving ability its advant ages Whenever lost control cycle spun out ran curb dashed under car clobbered mailbox post demonstrated durability system After two weeks hard use 13 novice drivers cycle has scuff marks acetate fairing evidence its hard life its tough first questions someone has never seen perform asks difficult keep upright answer very simple Its easy Unless driver does something upset cycle will happily drive forever straight line want turn thats different story Eleck Rider requires coordination ofthrottle steering negotiate turn tighter turn coordination required Steering accomplished turning front forlc done tilting fork front wheeVfork castered free turn direction So does cycle steer Very nicely thank extremely stable too have hit number obstructions include rocks manhole cover cracks pavement acorns jumping ramp etc very few exceptions cycle has stabilized itself motored electric motor operated servodriven rheostat throttle stick has spring return center Forward movement stick provides proportional forward speed Pulling back stick causes motor function like generator acts brake dead man throttle feature nice beginners since cycle will stop itself let go stick best place leam operate Eleck Rider large smooth area like parking lot Once driving proficiency achieved large area smaller places can tried out cycle started holding upright advancing throttle holding stable briefly acceler ates Initial operation should about R3 throttle gentle tums should attempted Sharper turns must accomplished throttling back turning cycle throttling up about halfway through turn slower cycle sharper turn can cycle will fall over gets too slow key success proper coordination throttle takes proficient RC pilot less half hour learn operate Eleck Rider Part problem RC newcomers will have deciding way move stick cycle heading toward An experienced pilot has advantage area because has already learned control airplane coming toward him Unfortunately old rule stick toward low wing doesnt help much motorcycle Am enjoying Eleck Rider Well weekday huny home work drive 30 minutes before gets dark weekends tough get chores done before taking out So far havent able racing others because first kid block have However several others way will probably racing around water-filled milk jugs local parking lot read Get case youve wondering next Pattern Problem Month will appear answer ts receive someone response request problems has very underwhelming Ron Von Puttg 12 Connie Drive Slzalimart FL 32579 Spin Tunnel Robelen continued page 24 good brands really am stuck Hot Stuff type glue truly superior Very light weight will never warp thinnest tail surface course dries immediately other brands Zap Jet etc areallfine Imsure Ijusthavenothadmuch experience Various finish techniques useful Sometimes apply coat sanding sealer Testors Hot Fuel Proof trim color am also pleased results using spray dyes use Deep-flex brand spray can found local variety store usual method construction start fuselage lightly tack glue two blocks together part vertical centerline first shape top view side view followed careful shaping 96 Model Aviation MAMMOTH SCALERS nce have available reeglete line enganeasmts alal eufflers enat 90 So 15 engines srsis OIaDRA WEBRA ar etc Wgite call far catalog emS price info Quarter Headquarters U 12321 5am raulmCaS4iI2 334,, contours After shaping pop blocks apart hollow out inside gouge blades nose area may left solidz however tail aft wing must quite light wing shaped suitable thickness balsa sheetfirst cutting planform forming airfoil finally setting dihedral place wings usually mounted cutting away appropriate area fuselage glueing wing place fairing necessary tail surfaces must very light therefore attempt form airfoil shapes etc Rather sand piece sheet balsa quite thin 0 10inch cut tail pieces fastened place tiny drops Hot Stuff finish may now applied after model ready balancing addition al ballasting scale weight etc As rule have able set control surfaces models moistening lightly bending have yet found need hinging controls nor could have built models good starting point controls set elevator up rudder spin direction ailerons against spinfor example up elevator left rudder right aileron aid launching made small paddle dowel handle wire rim fine mesh fabric center model placed nose facing launcher held open trap-door launching using finger same hand hold trap-door open model launched gently flicking wing tip finger other hand both starts model spinning propels tunnel throat trap-door allowed fall shut tunnel rpm adjusted balance spinning model Take word it whole lot easier show try describe old expression practice makes perfect really applies things happen pretty quickly As much research things always simple appear case am referring specific phenomena encounter ed tiny models cases models would maintain spin given set conditions though certain should looking answers already assuming lack agreement due Reynolds Number some other scaling effect Disturbing was still pleased overall effect models would spin smoothly fine demonstrations etc Playing hunch evening fastened strip scotch tape wing leading edges problem models form crude flap result dramatic model would spin readily rate spin spin angle-of-attack etc quite close what expected Fine tuning trimming tape produced flap about one-half wingspan one-tenth chord tape flaps place almost models will spin expected considering general lack knowledge prototype behavior effort better understand phenomena constructed small wing mounted force measurement scale another small wind tunnel Runs made tape flaps place As lift curves show lift developed especially higher angles attack such encountered tail spin will try draw lofty conclusions thisjust pass along data As photographs would indicate models patterned after current general aviation lightplanes has both good bad Bad because general lack information about spin behavior full scale aircraft prevents direct comparisons However category airplanes has areas March 1 980 97 Al Superiority HOT STUFE FOR THE MODELER WHO MUST HAVE MAXIMUM STRENGTH DEEP PENETRATION LIGHTEST WEIGHT VERSATILITY UNCOMPROMISING QUALITY INSTANTLY TIP BOOKLETS FREE ATOR YOUR HOBBY DEALER SEND SELF ADDRESSED STAMPED ENVELOPE TO iiGtfldO PROPELLERS Made polyester boil color Go GRISH propeller True helical pitch airfoil win-power Sizes pitches styles needs AT YOUR DEALER 2 Blade Tractor 5-3each 545354USc 63645Cc 747678Sc 8486887Cc 949-697 9810410-6Sc 11411-6118 *1 12412612-6815 2 Blade Pusher 5b3 5-4 6-36-4 Nc 8-6 Sc 9-610-681 3 Blade Tractor 53 6-364Nc 3 Blade Pusher 63Nc Metallic- Color Tractor 7678*1 8688*13 96 061041N Pusher06*15 design sensitivity small changes make dramatic differences tailspin behavior sensitive areas include wing airfoils wing location high wing low wing tail design fuselage contours especially behind wing control surface deflections C G location mass distri bution etc no perfect size spin models started models about two-in wingspan very convenient launching ease staying away tunnel walls recently have begun build larger models three-in wingspan have advantages easier construction possible interchangeable parts well being likely meet ballpark inertia requirements main drawback relates launching tunnel larger models tend strike walls easily sensitive design areas especially tailspin motions decided design own general aviation research modeL model theDBR-2 Special includes blend GRISH LARGE WOOD PROPELLERS HARDWOOD too hard minimizes chance costly plane engine damage True pitch airfoil fully finished balanced ready coating 3/8 BOREALL SIZES IN18 57 6 8 & 10 PITCH 20 8 22 10 24 13 RIGHT HAND TRACTOR BROS GRUSH ST JOHN INDIANA 46373 shapes found modern full-scale designs As drawn model portrays force set-up will tend have flat no-recovery spin mode may changed altering areas modeL have made several tail assemblies T-tail etc alone make dramatic differ ences spin behavior using basic model changing just piece time possible analyze results proposed design changes introducing too variables once also very interesting build actual scale models familiar airplanes Please very cautious about drawing conclusions live era product liability lawsuits simply amazing would want ever take chance falsely accusing brand airplane usual obstacle building scale models still applies namely lack information scrounging around have found several sources very helpful Jones Pocket Book Series great reference source some company brochures also excellent three-view drawings published various magazines Mass data typically hard find probably will require cross-referencing Generally published drawings larger desired larger cities will hae some photocopy machine capable making copies reduced size very 100 Model Aviation ALWAYS AVAILABLE AT YOUR HOBBY DEALER Satellite City PO Box 836 Simi CA 93065 805 522-0062 1 / 3 NEW SIZE IN 8 & 10 PITCH 26 $16 MINIATURE SPIN TUNNEL Model Test comparisons Models Approx 2 Wingspan ModelTunnel RPMSpin RateSpin AOA R PSDegrees Yankee #4 Tail410 0 85 Yankee #6 Tail610 50 ankee V Tail530 50 55 Yankee r Tail510 0 55 Sundowner520 30 35 PSU-1380 0- 75 BD-55580 5-80 BDSL480 5-80 F4U corsair580 5 50 cessnalso610 25-30 Piper Twin420 5 70 Variviggen520 30- 35 Zonker480Oscillatory VariezeNO SPIN handy shrinking job Photographic techniques would fine available use handy pocket calculator reduce dimensions draw plan grid paper As rule small detail may safely omitted antenna door latches etc changing results According tests NASA spin tunnel landing gear does affect model spin behavior measurable way reason leave delicate parts off models always refinements possible type project method measuring air velocity would real asset would method easily measuring spin rate models have experimented strobe light Seemingly no end variations possible project sort will always looking opportunities improve equipment techniques involved Maybe some day can find RC system tiny enough fit models could observe recovery behavior also Todays dream to-1 morrows project has theme through effort anyone would like correspond will try answer mail especially selfaddressed stamped envelope Happy spinning REFERENCES I Janet Pocket Book Series such Light Aircraft etc 2 Burt S M. Jr Bowman J S. Jr white E L SpinTunnel Investigation Spinning Characteristics Typical Single-Engine General Aviation Airplane Designs NASA Technical Paper 1009 September 1977 3 Beechcraft Today company hrochnre 4 Powers Bradford Ahout Size Model riarian January 1978 5 Powers Bradford Lets Talk About Reynolds Numbers Model Aviation February 1979 RC Pylon/Hager continued page 27 100% profit ideas get members wife bake cookies cupcakes brownies items sell very well 100% profit Always buy large size jars catsup mustard relish creamer sugar coffee Buy cups case What isnt used can saved another contest Dont sell items too high price want make profit dont overdo club can make several hundred dollars just well-run concession stand good example well-planned race annual Fort Wayne Flying Circuits Pylon Races run Jim Gager Jim club spend lot time before race day promoting As non-profit club can usually get free publicity local radio stations television helps promote sport gets public out see racing people also spend money club also gives out several hundred dollars prize money seems working year turn-out up 79 contest 28 entries Formula 36 entries Quarter Midget results Formula 11 Jim Moorehead 2 Bob Reuther 3 Dave Keats 4 Bill Johnason 5 Bob Onori 6 William Preis 7 Wayne Yeager 8 Eric Meyers 9 Al Grove 10 Art Arro Quarter Midget 1 Doug Bebensee 2 Duane Gall 3 Gail Jacobson 4 Dennis Sumner 5 Brian Richmond 6 Floyd Fitzgerald 7 Ken Heatlie 8 John Kilsdonk 9 Dave Timcoe 10 Allen Booth Any might have some ideas tips running successful race send will pass Bill Hager 4622 Bridgeport Dr Garland TX 75043 Inexpensive key word ACES new line R/C kits called Silver Series line offers unique combination value wide range versatility found todays R/C market until now cutting out biggeal costs Labor furnish kit furnish labor allows us give top-quality product inexpensive price comparable $800 radios its featuren * SERVO REVERSAL SWITCHES--With ists flip aft switch terso travel direcriae etch four psievasy channets rue reversed INDEPENDENT THROW ADJUST-On chavuels amount servo travel can cos stalled independeerty * EtETH CHANNEL ADItJST--Seeno position whea retract switch either le Up Down posirice ledepeedeutly adiastabte * TRtM LOCATtON rARtABLES-flee marion af trims us builders discrerivo cue have standard trim crossed trim cemhiaatioe two TRtM AUTI-IORITY PROORAMMABILITYBy ebasgiag plug-in lived resistors amouas remo esoursios whes tIre trims mooed programmable * DUAL RATE--Switches aed adiusemeet pats famished provide DUAL RATE up three channels EXPONENTIAL RATE OPTtONThis ptughs option provides ean-liarar servo teasel se klatioe snob movement up three vhannels 5t795 ELECTRONIC MIXER OPEIONWith plug-in modate two functices cue N k-i together tither onidirectiaerlly arhidireosioeally lSlt95 * PROGRAMMABLE PUSH BUTTON OPTION-te-tight adiustable peepeogeammed covasot surface muermena may obtained push g h $89 THE SILVER SEVEN $28495 Full ni cd system kit receiver four servos two classics Flyline Farman Moustique SEE YOUR LOCAL HOBBY DEALER send 25c catalog 34 span 020 power $1595 QUAKER FLASH single Channel nC Power free flight Y9 Wtngspan FLYLINE MODELS INC aaaa DORR AVENUE lB FAIRFAX VtAGINIA aunas 17031 5732t38 March 1980 101 Cheek wish Ane dealer metre naIl nomptate datailt crws S complete Catalogs $100 lasid $BOfo CaunMa urnl Box 511E 119W 19th. Higginsville Mo 64037 816 584-7121 COMING SOON 117e READY NOW
Edition: Model Aviation - 1980/03
Page Numbers: 20, 21, 22, 23, 24, 96, 97, 98, 99
both magazine state R IUJNN L art pleased present uniqu report As will see author brought work home him TAILSPIN Flat spin other performed deliberate tailspins some time during very rapidly nose-high attitude Generally related terms phrases associated sport fun flying session Occasionally attempts recover useless model important hut little understood area airplane spin begunusually anew design non- crashes Rare unusual No Mysterious flight Most us fly RC models have standard styling model will begin rotate Yes Lest modelers feel lonely designers About release model 2-in span PSU-1 0~rvihg spin test operation tinyPenn State University Dave prepares flickDave retrieves PSU-1 through hatch model plainly seen through windowleft wing tiptunnel bottom certainly tiny 20 Model Aviation full-scale aircraft occasionally experience same dilemma Perhaps can imagine results study research aircraft tailspins has subject much energetic effort research teams ofthe valuable facilities research type spin tunnel concept involves wind tunnel standing vertically air being drawn upward fan mounted top Models launched whirling motion like frisbee rising air within spin tunnel fan rpm adjusted just balance descent rate model being tested result opportunity closely study motion behavior model Research facilities nature quite rare being two free world NASA has Langley Field Virginia other located France NASA spin tunnel measures twenty feet across test chamber usual model size about two feet wingspan models equipped RC operate controls thus making possible study recovery behavior work NASA-Langley am often exposed spin-tunnel tests have become quite fascinated very safe method testing critical motions model airplanes Lacking priority compete testing time ADJUST GAP TO CALIBRATE RELAY COIL C7j37ORTH MAGNET 3N DIA1/8 THICK WOOD OR PLASTIC6O NI1N34A 0 PM 0 aN magnetic tachometer made Radio Shack parts Magnets glued plastic disk glued fan assembly Relay coil mounted wood cross member position coil tweaked achieve desired output meter C B H9 10 rH B25 RADIUS INSIDE 3 fA TUNNEL CROSS SECTIONS ALL DIMENSIONS ARE INSIDE tunnel made cardboard Plexiglass windows hinged strapping tape Masking tape liberally used hold things together along Titebond glue II 3 lur lower area rapidly spinning Beechcraft 33 right-turn spin RELAY COIL 8KfL vi IOmF c-c I5 F 15BB // AA / rirai evaion moaels aii Z- Span lop Bottom Bede BD5-J Cessna 150 Piper Arapahoe Penn State PS U-i 30 05 3M I--5 i ASIC WINC WFH urn / V /1/ / ESi VELOCITY 20 0 30 40 graph shows effect leading edge flaps wing lift Full-size airfoil top right NASA spin tunnel began wonder about constructing very own having budget federal agency began realize spin tunnel would have just bit smaller perhaps little less elegant search house shop tumed up floor fan 20-inch diameter blades variable transformer controlled just fine Finding contours wind tunnels small sizes rather tricky business chose cardboard structural material avail able wherever grocery stores found easily modified miniature spin tunnel scale model larger unit specific design tailored job intended detailed construction article therefore will speak general terms omit detailed construction information spin tunnel fashioned cardboard has Plexiglass viewing windows used jigsaw cut launching hatch window hinged strapping tape Masking tape used jiberally hold things together along Titebond glue Strips wood support fan unit top well providing bottom frame legs flow-straightener grid bottom too may cardboard silk-like polyester fabric net stretched across grid serves two purposes smooth airflow catch models bottom rather large hatch cut bottom cone purpose retrieving 22 Model Aviation 8 6 CL / f. / oz U UlO rz z 0 C I1 0 0 I1 IThe launch padd9e Model placed nose facing launcher held theopentrapdoor launching using finger same hand hold open door Tools used making miniscule planes scales Iauncn paddle Models Mooney M2OC left four 2- span Yankees variety tail configurations EAA biplane 0-1 gram scale6-in machiniaL rule ulCyluUllu models desk lamp borrowed son s room used light jAterior painted interior flat black could see models spray-painted outside silver aerosol canlooks better assorted grocery cartons tachometer shown constructed parts purchased local Radio Shack store See sketch schematic details magnets glued plastic disk glued fan assembly mounted relay coil wooden cross-member tweaked position coil achieve desired output meter As spin tunnel began taking shape became obvious size models would quite small experience industrial test models aware need properly scale weight balance inertias dimensions spin test models measure values another matter have found six-inch long machinists ruler best friend measur ing tiny model dimensions can bought graduations / 100-inch found wherever machinist tools sold Try Sears Roebuck Measuring weight another problemi General ly complete model will weigh between one-tenth N I IIII liii I I Ifer 800 600 1 0 20C 0 j K MINIATURE SPIN TUNNEL MAXIMUM OUTPUT 21FPS AT 980 RPM inL --II 12 16 VELOCITY RPS graph provides values air velocity ft/sec read against rpm fan gram gram depending model scale prototype weight solution construct scales job simple spring wire scale shown handy weighing parts quickly during construction exotic beam scale super weighing complete models Check drawings specific details scale custom job Construction follows same theme specific variations noted Generally used Hot Stuff type glue throughout bonding 20 halta wood structure beam scale pivots two strips copper wire resting new razor blade no nicks please Calibration tiny scales accomplish ed follows length 1/32-in wire solder trimmed until weighed exactly gramlocal druggist piece measured length recorded Short pieces solder cut length one-tenth long 1/100 full length gave calibration weights Balance Notes 1 balsa 2 Assemble Hot Stuff 3 Two slide weights ten times weight other 4 Lead counterweight just balances 5 Maximum range determined slide-weights Dave sets balance 1 gram pan both maximum travel Again reduce size drawing Bottom piece plus 3/16 sq right measures B inches 1/32 PAN I/16X 1/16 / STOP PINS 0 3116x 3/16 3/16X 3/40 V March 1980 23 0 Three 2-in canards top bottom Zonker Rutan Variviggen Rutan VariEze COUNTER WEIGHTSLIDE WEIGHTS -TWO WIRE BEARINGS DBR-2 Special hypothetical full-scale prototype Span 25 ft area 104 sq ft. weight 1500 lbs Model 1/100th scale Span 3 in. area 15 sq weight 68 grams CG 25% chord As shown model should have flat no-recovery spin mode moving stab higher T-tail interesting effect would immediately noticed .-i ri-rn PANJ} 1132 H 1/32 X 3/16 x 112 ALL WOCO IS BALSA I/ l14X 3/4e BASE WIRE WITHOUT PAN 3/l6aX 3/16 gram one-tenth gram 1/100 gram used calibrating marks various scale bars Checking balance tiny models also requires special set-up None old fingertip under wingtips use 020-in music wire length wire passing through fuselage desired balance location Two lengths wire glued strip wood model suspended across handiest material ballast thin lead cut small slivers pointed shapes push nose needed trimming lead until model hangs level balance wires aircraft spinning moments inertia about various axis have major influence spin behavior value have developed proper technique measur ing would appreciate suggestions present method construct models simulate empty weight prototype airplane add weight center model until matches scale gross weight prototype Additionally distribution mass prototype must considered since twinengine design tip tanks will very different single-engine planes respect Construction dwarf scale models much less difficult first appearances Real ly patient reader will share some techniques hope shedding some light matter tools expensive exotic yet has purpose Tweezers nearly essential really sharp knife prefer Uber Skiver No 11 blade however really sharp X-Acto will job too Good sharp single-edge razor blades always handy especially broken special shapes pliers hollow out fuselages models X-Acto gouges great usual sanding blocks out question use sandpaper glued onto coffee stirring sticks can made up shapes different sandpaper grits six-in ruler just right measurements magnifying glass real asset Any other tools equipment found under miscellaneous pins razor saw etc Balsa wood favorite material far just has lightest easiest working material available tiny models require little sheet seems last forever am real choosy wood selecting clear-grained unwarped extremely light stock favorite Sig Contest Balsa although plenty Continued page 96 Scale calibrated short lengths wire solder Ex 125 1/32 solder equals 1 gram 125 equals 01 gram could show drawing full-size prepared author dimensions base piece rear upright both 4 inches 24 Model Aviation Beechcraft Sundowner 0-25 gram springwire scales Dave dreams someday finding RC system fit little aircraftJ DRAWN FULL SIZE QL ii L OPTIONAL TAPE FLAPS QHARP A-A CORNER 3FA -LA II 0 5 dii SPORT AEROBATICS Ron Van Putte COUPLE months ago 1 mentioned instructor problem some clubs have tunately club has excellent instruction program beginners largely due enthusiasm club instructors feature program other clubs might like copy awarding solo certificates novice pilot instructor club meeting Blank certificates printed up club president Ed Moorman AMA DistrictS AVP North Florida Ed types appropriate information about novice pilot gives completed certificate instructor presentation Both novice pilots instructors like idea club might like try too Good instructors leave helpful hints students reading club newsletters ModelAviations publisher Carl Wheeley sends came across great article Ed Cocciola Cedar Rapids low Skyhawks newsletter Logbook good advice contained Eds article bears repeating printing slightly edited version Notes Novices Since 1973 have seen lot Skyhawks pass through club Some made quite contribution own way talking about couple dont mean slight ofthose dont mention also made contribution said have reason bringing up particular ones wanting solo summer still needed someone take off after wandering around sky fur 10 15 minutes Id yell someone land Sound familiar bet doing since summer before day plane starting spin trying figure out should giving left turn right turn Bill Birkey grabbed trans mitter straightened Out regained lost altitude still wasnt flying less three mistakes high done count less times before Jim Clark once grabbed transmitter pulled Falcon 56 out spin about four feet off deck day stood watching crash However Bill Birkey did something different stuck handed back transmitter day said shes coming Ed watch low wing straighten up just push stick low wing Now isnt simple time trying mentally sort out plane coming turning toward right really planes left means have push stick? Oh hell has crashed now anyway quick easy just push toward low wing need know left right Maybe thats problem Right quit getting much trouble began really enjoying flying wasnt getting closer making landings day later summer George Moger came over asked flying plane flying up doing usual aimless wandering routine did know what meant explained wasnt leading airplane just following around keep ing range wasnt trying anything keep crashing plane went wanted within radio range George said want solo have start making plane go directly point another fly predetermined route wandering chang ing course have accomplish order able set up landing approach course stay landing simply matter flying approach pattern lower lower until finally can just cut throttle let settle runway Well next few weeks flying pattern constantly remember first time came down runway 15 feet air thought skimming deck George usually would still yell him someone land thought fuel getting low day yelled George entered base leg said Cut throttle As did turned hand him transmitter walking away yelled just said Land kept walking Falcon rolled stop still its wheels piece happiest guy Linn County George Bill club now other guys around can much George Bill Jim others did Just give chance Happy landings Thanks Ed beginners can put selves article benefit Maybe epitaph some airplanes can postponed Speaking epitaphs John Thomas editor West Orange Sunfliers Orlando FL newsletter Sun beam published following RIP lies airplane red blue white turned left should have turned right last two weeks have enjoying new exciting phase radio control modeling purchased Kraft Eleck Rider motorcycle KP-2A radio systern After about three hours assembly cycle operating Continued page 96 26 Model Aviation Van Putte Mustang sports license plate 10 conTests aii over oeep uuth Ron says honk wave see car give him call CB airplanes may get crack two out coupie 01 keep going Celastic patches decorated Magic Marker ld Roberts ship looks luxurious nocing ne put iii painted interior adhesive sprinkled flocking Purchasing R/C Aircraft easy YOUNIQUE AT Hobby Capital keep large ready supply af Custom-Bilt RC Aircraft Kits Engines RC Units times And. thanks ta years af experience dealing people sections af US. prepare special ane-of-a-kind RC Aircraft far special one-ofa-kind RC Flyer wha demands unique laok express tastes Chances youll find custom paint finish exquisite detailed cockpit interiors glassed engine compartments real scale wheels custom grilled nose section will knock socks offi. youll probably never see another like cause Hobby Capitol expert stressed preparation goes far beyond standard checkout RC shoppers turning up increasing numbers convenient showroom because word out. outstanding buys service finest selection unique RC Aircraft anywhere its HOBBY CAPITOL Old Ignition Trode4n Buy sell old time ignition engines Box up what have send us honest appraisal could worth new proportional set have engines can also start collection welcome built-up airplanes used proportionals old time ignition engines Come trade us lop dollar paid Built Order Rons Kt stock choose Its s400OO Pipet Tri-Poce Quarter Scale 89 wingspan 42 Sq Ft detailed plans $1699 PR Send $i00 self addressed stamped envelope far detailed list Built-Up R/C Models ond 50% Sale Hobby Capitol 46 N Oak St Ventura CA 93001 Phone 805 643-7616 / 642-8465 efforts promote models look fly like full-size counterparts may finally blossom ing full bloom Las Vegas TOC thing andthe IMAC organization promoting aerobatic models have copies full scale machines CAP addition pack hopefully add pleasure others just did Glen Hazel Sig gang up Iowa doing share promote IMAC philosophy decide build CAP sashay up next year enjoy bash put benefit us modelers RC Aerobatics/Van Putte continued page 26 street front house said technique faultless beginning Eleck Rider performed perfectly Id half truthful cycle did perform perfectly technique left lot desired initially poor driving ability its advant ages Whenever lost control cycle spun out ran curb dashed under car clobbered mailbox post demonstrated durability system After two weeks hard use 13 novice drivers cycle has scuff marks acetate fairing evidence its hard life its tough first questions someone has never seen perform asks difficult keep upright answer very simple Its easy Unless driver does something upset cycle will happily drive forever straight line want turn thats different story Eleck Rider requires coordination ofthrottle steering negotiate turn tighter turn coordination required Steering accomplished turning front forlc done tilting fork front wheeVfork castered free turn direction So does cycle steer Very nicely thank extremely stable too have hit number obstructions include rocks manhole cover cracks pavement acorns jumping ramp etc very few exceptions cycle has stabilized itself motored electric motor operated servodriven rheostat throttle stick has spring return center Forward movement stick provides proportional forward speed Pulling back stick causes motor function like generator acts brake dead man throttle feature nice beginners since cycle will stop itself let go stick best place leam operate Eleck Rider large smooth area like parking lot Once driving proficiency achieved large area smaller places can tried out cycle started holding upright advancing throttle holding stable briefly acceler ates Initial operation should about R3 throttle gentle tums should attempted Sharper turns must accomplished throttling back turning cycle throttling up about halfway through turn slower cycle sharper turn can cycle will fall over gets too slow key success proper coordination throttle takes proficient RC pilot less half hour learn operate Eleck Rider Part problem RC newcomers will have deciding way move stick cycle heading toward An experienced pilot has advantage area because has already learned control airplane coming toward him Unfortunately old rule stick toward low wing doesnt help much motorcycle Am enjoying Eleck Rider Well weekday huny home work drive 30 minutes before gets dark weekends tough get chores done before taking out So far havent able racing others because first kid block have However several others way will probably racing around water-filled milk jugs local parking lot read Get case youve wondering next Pattern Problem Month will appear answer ts receive someone response request problems has very underwhelming Ron Von Puttg 12 Connie Drive Slzalimart FL 32579 Spin Tunnel Robelen continued page 24 good brands really am stuck Hot Stuff type glue truly superior Very light weight will never warp thinnest tail surface course dries immediately other brands Zap Jet etc areallfine Imsure Ijusthavenothadmuch experience Various finish techniques useful Sometimes apply coat sanding sealer Testors Hot Fuel Proof trim color am also pleased results using spray dyes use Deep-flex brand spray can found local variety store usual method construction start fuselage lightly tack glue two blocks together part vertical centerline first shape top view side view followed careful shaping 96 Model Aviation MAMMOTH SCALERS nce have available reeglete line enganeasmts alal eufflers enat 90 So 15 engines srsis OIaDRA WEBRA ar etc Wgite call far catalog emS price info Quarter Headquarters U 12321 5am raulmCaS4iI2 334,, contours After shaping pop blocks apart hollow out inside gouge blades nose area may left solidz however tail aft wing must quite light wing shaped suitable thickness balsa sheetfirst cutting planform forming airfoil finally setting dihedral place wings usually mounted cutting away appropriate area fuselage glueing wing place fairing necessary tail surfaces must very light therefore attempt form airfoil shapes etc Rather sand piece sheet balsa quite thin 0 10inch cut tail pieces fastened place tiny drops Hot Stuff finish may now applied after model ready balancing addition al ballasting scale weight etc As rule have able set control surfaces models moistening lightly bending have yet found need hinging controls nor could have built models good starting point controls set elevator up rudder spin direction ailerons against spinfor example up elevator left rudder right aileron aid launching made small paddle dowel handle wire rim fine mesh fabric center model placed nose facing launcher held open trap-door launching using finger same hand hold trap-door open model launched gently flicking wing tip finger other hand both starts model spinning propels tunnel throat trap-door allowed fall shut tunnel rpm adjusted balance spinning model Take word it whole lot easier show try describe old expression practice makes perfect really applies things happen pretty quickly As much research things always simple appear case am referring specific phenomena encounter ed tiny models cases models would maintain spin given set conditions though certain should looking answers already assuming lack agreement due Reynolds Number some other scaling effect Disturbing was still pleased overall effect models would spin smoothly fine demonstrations etc Playing hunch evening fastened strip scotch tape wing leading edges problem models form crude flap result dramatic model would spin readily rate spin spin angle-of-attack etc quite close what expected Fine tuning trimming tape produced flap about one-half wingspan one-tenth chord tape flaps place almost models will spin expected considering general lack knowledge prototype behavior effort better understand phenomena constructed small wing mounted force measurement scale another small wind tunnel Runs made tape flaps place As lift curves show lift developed especially higher angles attack such encountered tail spin will try draw lofty conclusions thisjust pass along data As photographs would indicate models patterned after current general aviation lightplanes has both good bad Bad because general lack information about spin behavior full scale aircraft prevents direct comparisons However category airplanes has areas March 1 980 97 Al Superiority HOT STUFE FOR THE MODELER WHO MUST HAVE MAXIMUM STRENGTH DEEP PENETRATION LIGHTEST WEIGHT VERSATILITY UNCOMPROMISING QUALITY INSTANTLY TIP BOOKLETS FREE ATOR YOUR HOBBY DEALER SEND SELF ADDRESSED STAMPED ENVELOPE TO iiGtfldO PROPELLERS Made polyester boil color Go GRISH propeller True helical pitch airfoil win-power Sizes pitches styles needs AT YOUR DEALER 2 Blade Tractor 5-3each 545354USc 63645Cc 747678Sc 8486887Cc 949-697 9810410-6Sc 11411-6118 *1 12412612-6815 2 Blade Pusher 5b3 5-4 6-36-4 Nc 8-6 Sc 9-610-681 3 Blade Tractor 53 6-364Nc 3 Blade Pusher 63Nc Metallic- Color Tractor 7678*1 8688*13 96 061041N Pusher06*15 design sensitivity small changes make dramatic differences tailspin behavior sensitive areas include wing airfoils wing location high wing low wing tail design fuselage contours especially behind wing control surface deflections C G location mass distri bution etc no perfect size spin models started models about two-in wingspan very convenient launching ease staying away tunnel walls recently have begun build larger models three-in wingspan have advantages easier construction possible interchangeable parts well being likely meet ballpark inertia requirements main drawback relates launching tunnel larger models tend strike walls easily sensitive design areas especially tailspin motions decided design own general aviation research modeL model theDBR-2 Special includes blend GRISH LARGE WOOD PROPELLERS HARDWOOD too hard minimizes chance costly plane engine damage True pitch airfoil fully finished balanced ready coating 3/8 BOREALL SIZES IN18 57 6 8 & 10 PITCH 20 8 22 10 24 13 RIGHT HAND TRACTOR BROS GRUSH ST JOHN INDIANA 46373 shapes found modern full-scale designs As drawn model portrays force set-up will tend have flat no-recovery spin mode may changed altering areas modeL have made several tail assemblies T-tail etc alone make dramatic differ ences spin behavior using basic model changing just piece time possible analyze results proposed design changes introducing too variables once also very interesting build actual scale models familiar airplanes Please very cautious about drawing conclusions live era product liability lawsuits simply amazing would want ever take chance falsely accusing brand airplane usual obstacle building scale models still applies namely lack information scrounging around have found several sources very helpful Jones Pocket Book Series great reference source some company brochures also excellent three-view drawings published various magazines Mass data typically hard find probably will require cross-referencing Generally published drawings larger desired larger cities will hae some photocopy machine capable making copies reduced size very 100 Model Aviation ALWAYS AVAILABLE AT YOUR HOBBY DEALER Satellite City PO Box 836 Simi CA 93065 805 522-0062 1 / 3 NEW SIZE IN 8 & 10 PITCH 26 $16 MINIATURE SPIN TUNNEL Model Test comparisons Models Approx 2 Wingspan ModelTunnel RPMSpin RateSpin AOA R PSDegrees Yankee #4 Tail410 0 85 Yankee #6 Tail610 50 ankee V Tail530 50 55 Yankee r Tail510 0 55 Sundowner520 30 35 PSU-1380 0- 75 BD-55580 5-80 BDSL480 5-80 F4U corsair580 5 50 cessnalso610 25-30 Piper Twin420 5 70 Variviggen520 30- 35 Zonker480Oscillatory VariezeNO SPIN handy shrinking job Photographic techniques would fine available use handy pocket calculator reduce dimensions draw plan grid paper As rule small detail may safely omitted antenna door latches etc changing results According tests NASA spin tunnel landing gear does affect model spin behavior measurable way reason leave delicate parts off models always refinements possible type project method measuring air velocity would real asset would method easily measuring spin rate models have experimented strobe light Seemingly no end variations possible project sort will always looking opportunities improve equipment techniques involved Maybe some day can find RC system tiny enough fit models could observe recovery behavior also Todays dream to-1 morrows project has theme through effort anyone would like correspond will try answer mail especially selfaddressed stamped envelope Happy spinning REFERENCES I Janet Pocket Book Series such Light Aircraft etc 2 Burt S M. Jr Bowman J S. Jr white E L SpinTunnel Investigation Spinning Characteristics Typical Single-Engine General Aviation Airplane Designs NASA Technical Paper 1009 September 1977 3 Beechcraft Today company hrochnre 4 Powers Bradford Ahout Size Model riarian January 1978 5 Powers Bradford Lets Talk About Reynolds Numbers Model Aviation February 1979 RC Pylon/Hager continued page 27 100% profit ideas get members wife bake cookies cupcakes brownies items sell very well 100% profit Always buy large size jars catsup mustard relish creamer sugar coffee Buy cups case What isnt used can saved another contest Dont sell items too high price want make profit dont overdo club can make several hundred dollars just well-run concession stand good example well-planned race annual Fort Wayne Flying Circuits Pylon Races run Jim Gager Jim club spend lot time before race day promoting As non-profit club can usually get free publicity local radio stations television helps promote sport gets public out see racing people also spend money club also gives out several hundred dollars prize money seems working year turn-out up 79 contest 28 entries Formula 36 entries Quarter Midget results Formula 11 Jim Moorehead 2 Bob Reuther 3 Dave Keats 4 Bill Johnason 5 Bob Onori 6 William Preis 7 Wayne Yeager 8 Eric Meyers 9 Al Grove 10 Art Arro Quarter Midget 1 Doug Bebensee 2 Duane Gall 3 Gail Jacobson 4 Dennis Sumner 5 Brian Richmond 6 Floyd Fitzgerald 7 Ken Heatlie 8 John Kilsdonk 9 Dave Timcoe 10 Allen Booth Any might have some ideas tips running successful race send will pass Bill Hager 4622 Bridgeport Dr Garland TX 75043 Inexpensive key word ACES new line R/C kits called Silver Series line offers unique combination value wide range versatility found todays R/C market until now cutting out biggeal costs Labor furnish kit furnish labor allows us give top-quality product inexpensive price comparable $800 radios its featuren * SERVO REVERSAL SWITCHES--With ists flip aft switch terso travel direcriae etch four psievasy channets rue reversed INDEPENDENT THROW ADJUST-On chavuels amount servo travel can cos stalled independeerty * EtETH CHANNEL ADItJST--Seeno position whea retract switch either le Up Down posirice ledepeedeutly adiastabte * TRtM LOCATtON rARtABLES-flee marion af trims us builders discrerivo cue have standard trim crossed trim cemhiaatioe two TRtM AUTI-IORITY PROORAMMABILITYBy ebasgiag plug-in lived resistors amouas remo esoursios whes tIre trims mooed programmable * DUAL RATE--Switches aed adiusemeet pats famished provide DUAL RATE up three channels EXPONENTIAL RATE OPTtONThis ptughs option provides ean-liarar servo teasel se klatioe snob movement up three vhannels 5t795 ELECTRONIC MIXER OPEIONWith plug-in modate two functices cue N k-i together tither onidirectiaerlly arhidireosioeally lSlt95 * PROGRAMMABLE PUSH BUTTON OPTION-te-tight adiustable peepeogeammed covasot surface muermena may obtained push g h $89 THE SILVER SEVEN $28495 Full ni cd system kit receiver four servos two classics Flyline Farman Moustique SEE YOUR LOCAL HOBBY DEALER send 25c catalog 34 span 020 power $1595 QUAKER FLASH single Channel nC Power free flight Y9 Wtngspan FLYLINE MODELS INC aaaa DORR AVENUE lB FAIRFAX VtAGINIA aunas 17031 5732t38 March 1980 101 Cheek wish Ane dealer metre naIl nomptate datailt crws S complete Catalogs $100 lasid $BOfo CaunMa urnl Box 511E 119W 19th. Higginsville Mo 64037 816 584-7121 COMING SOON 117e READY NOW
Edition: Model Aviation - 1980/03
Page Numbers: 20, 21, 22, 23, 24, 96, 97, 98, 99
both magazine state R IUJNN L art pleased present uniqu report As will see author brought work home him TAILSPIN Flat spin other performed deliberate tailspins some time during very rapidly nose-high attitude Generally related terms phrases associated sport fun flying session Occasionally attempts recover useless model important hut little understood area airplane spin begunusually anew design non- crashes Rare unusual No Mysterious flight Most us fly RC models have standard styling model will begin rotate Yes Lest modelers feel lonely designers About release model 2-in span PSU-1 0~rvihg spin test operation tinyPenn State University Dave prepares flickDave retrieves PSU-1 through hatch model plainly seen through windowleft wing tiptunnel bottom certainly tiny 20 Model Aviation full-scale aircraft occasionally experience same dilemma Perhaps can imagine results study research aircraft tailspins has subject much energetic effort research teams ofthe valuable facilities research type spin tunnel concept involves wind tunnel standing vertically air being drawn upward fan mounted top Models launched whirling motion like frisbee rising air within spin tunnel fan rpm adjusted just balance descent rate model being tested result opportunity closely study motion behavior model Research facilities nature quite rare being two free world NASA has Langley Field Virginia other located France NASA spin tunnel measures twenty feet across test chamber usual model size about two feet wingspan models equipped RC operate controls thus making possible study recovery behavior work NASA-Langley am often exposed spin-tunnel tests have become quite fascinated very safe method testing critical motions model airplanes Lacking priority compete testing time ADJUST GAP TO CALIBRATE RELAY COIL C7j37ORTH MAGNET 3N DIA1/8 THICK WOOD OR PLASTIC6O NI1N34A 0 PM 0 aN magnetic tachometer made Radio Shack parts Magnets glued plastic disk glued fan assembly Relay coil mounted wood cross member position coil tweaked achieve desired output meter C B H9 10 rH B25 RADIUS INSIDE 3 fA TUNNEL CROSS SECTIONS ALL DIMENSIONS ARE INSIDE tunnel made cardboard Plexiglass windows hinged strapping tape Masking tape liberally used hold things together along Titebond glue II 3 lur lower area rapidly spinning Beechcraft 33 right-turn spin RELAY COIL 8KfL vi IOmF c-c I5 F 15BB // AA / rirai evaion moaels aii Z- Span lop Bottom Bede BD5-J Cessna 150 Piper Arapahoe Penn State PS U-i 30 05 3M I--5 i ASIC WINC WFH urn / V /1/ / ESi VELOCITY 20 0 30 40 graph shows effect leading edge flaps wing lift Full-size airfoil top right NASA spin tunnel began wonder about constructing very own having budget federal agency began realize spin tunnel would have just bit smaller perhaps little less elegant search house shop tumed up floor fan 20-inch diameter blades variable transformer controlled just fine Finding contours wind tunnels small sizes rather tricky business chose cardboard structural material avail able wherever grocery stores found easily modified miniature spin tunnel scale model larger unit specific design tailored job intended detailed construction article therefore will speak general terms omit detailed construction information spin tunnel fashioned cardboard has Plexiglass viewing windows used jigsaw cut launching hatch window hinged strapping tape Masking tape used jiberally hold things together along Titebond glue Strips wood support fan unit top well providing bottom frame legs flow-straightener grid bottom too may cardboard silk-like polyester fabric net stretched across grid serves two purposes smooth airflow catch models bottom rather large hatch cut bottom cone purpose retrieving 22 Model Aviation 8 6 CL / f. / oz U UlO rz z 0 C I1 0 0 I1 IThe launch padd9e Model placed nose facing launcher held theopentrapdoor launching using finger same hand hold open door Tools used making miniscule planes scales Iauncn paddle Models Mooney M2OC left four 2- span Yankees variety tail configurations EAA biplane 0-1 gram scale6-in machiniaL rule ulCyluUllu models desk lamp borrowed son s room used light jAterior painted interior flat black could see models spray-painted outside silver aerosol canlooks better assorted grocery cartons tachometer shown constructed parts purchased local Radio Shack store See sketch schematic details magnets glued plastic disk glued fan assembly mounted relay coil wooden cross-member tweaked position coil achieve desired output meter As spin tunnel began taking shape became obvious size models would quite small experience industrial test models aware need properly scale weight balance inertias dimensions spin test models measure values another matter have found six-inch long machinists ruler best friend measur ing tiny model dimensions can bought graduations / 100-inch found wherever machinist tools sold Try Sears Roebuck Measuring weight another problemi General ly complete model will weigh between one-tenth N I IIII liii I I Ifer 800 600 1 0 20C 0 j K MINIATURE SPIN TUNNEL MAXIMUM OUTPUT 21FPS AT 980 RPM inL --II 12 16 VELOCITY RPS graph provides values air velocity ft/sec read against rpm fan gram gram depending model scale prototype weight solution construct scales job simple spring wire scale shown handy weighing parts quickly during construction exotic beam scale super weighing complete models Check drawings specific details scale custom job Construction follows same theme specific variations noted Generally used Hot Stuff type glue throughout bonding 20 halta wood structure beam scale pivots two strips copper wire resting new razor blade no nicks please Calibration tiny scales accomplish ed follows length 1/32-in wire solder trimmed until weighed exactly gramlocal druggist piece measured length recorded Short pieces solder cut length one-tenth long 1/100 full length gave calibration weights Balance Notes 1 balsa 2 Assemble Hot Stuff 3 Two slide weights ten times weight other 4 Lead counterweight just balances 5 Maximum range determined slide-weights Dave sets balance 1 gram pan both maximum travel Again reduce size drawing Bottom piece plus 3/16 sq right measures B inches 1/32 PAN I/16X 1/16 / STOP PINS 0 3116x 3/16 3/16X 3/40 V March 1980 23 0 Three 2-in canards top bottom Zonker Rutan Variviggen Rutan VariEze COUNTER WEIGHTSLIDE WEIGHTS -TWO WIRE BEARINGS DBR-2 Special hypothetical full-scale prototype Span 25 ft area 104 sq ft. weight 1500 lbs Model 1/100th scale Span 3 in. area 15 sq weight 68 grams CG 25% chord As shown model should have flat no-recovery spin mode moving stab higher T-tail interesting effect would immediately noticed .-i ri-rn PANJ} 1132 H 1/32 X 3/16 x 112 ALL WOCO IS BALSA I/ l14X 3/4e BASE WIRE WITHOUT PAN 3/l6aX 3/16 gram one-tenth gram 1/100 gram used calibrating marks various scale bars Checking balance tiny models also requires special set-up None old fingertip under wingtips use 020-in music wire length wire passing through fuselage desired balance location Two lengths wire glued strip wood model suspended across handiest material ballast thin lead cut small slivers pointed shapes push nose needed trimming lead until model hangs level balance wires aircraft spinning moments inertia about various axis have major influence spin behavior value have developed proper technique measur ing would appreciate suggestions present method construct models simulate empty weight prototype airplane add weight center model until matches scale gross weight prototype Additionally distribution mass prototype must considered since twinengine design tip tanks will very different single-engine planes respect Construction dwarf scale models much less difficult first appearances Real ly patient reader will share some techniques hope shedding some light matter tools expensive exotic yet has purpose Tweezers nearly essential really sharp knife prefer Uber Skiver No 11 blade however really sharp X-Acto will job too Good sharp single-edge razor blades always handy especially broken special shapes pliers hollow out fuselages models X-Acto gouges great usual sanding blocks out question use sandpaper glued onto coffee stirring sticks can made up shapes different sandpaper grits six-in ruler just right measurements magnifying glass real asset Any other tools equipment found under miscellaneous pins razor saw etc Balsa wood favorite material far just has lightest easiest working material available tiny models require little sheet seems last forever am real choosy wood selecting clear-grained unwarped extremely light stock favorite Sig Contest Balsa although plenty Continued page 96 Scale calibrated short lengths wire solder Ex 125 1/32 solder equals 1 gram 125 equals 01 gram could show drawing full-size prepared author dimensions base piece rear upright both 4 inches 24 Model Aviation Beechcraft Sundowner 0-25 gram springwire scales Dave dreams someday finding RC system fit little aircraftJ DRAWN FULL SIZE QL ii L OPTIONAL TAPE FLAPS QHARP A-A CORNER 3FA -LA II 0 5 dii SPORT AEROBATICS Ron Van Putte COUPLE months ago 1 mentioned instructor problem some clubs have tunately club has excellent instruction program beginners largely due enthusiasm club instructors feature program other clubs might like copy awarding solo certificates novice pilot instructor club meeting Blank certificates printed up club president Ed Moorman AMA DistrictS AVP North Florida Ed types appropriate information about novice pilot gives completed certificate instructor presentation Both novice pilots instructors like idea club might like try too Good instructors leave helpful hints students reading club newsletters ModelAviations publisher Carl Wheeley sends came across great article Ed Cocciola Cedar Rapids low Skyhawks newsletter Logbook good advice contained Eds article bears repeating printing slightly edited version Notes Novices Since 1973 have seen lot Skyhawks pass through club Some made quite contribution own way talking about couple dont mean slight ofthose dont mention also made contribution said have reason bringing up particular ones wanting solo summer still needed someone take off after wandering around sky fur 10 15 minutes Id yell someone land Sound familiar bet doing since summer before day plane starting spin trying figure out should giving left turn right turn Bill Birkey grabbed trans mitter straightened Out regained lost altitude still wasnt flying less three mistakes high done count less times before Jim Clark once grabbed transmitter pulled Falcon 56 out spin about four feet off deck day stood watching crash However Bill Birkey did something different stuck handed back transmitter day said shes coming Ed watch low wing straighten up just push stick low wing Now isnt simple time trying mentally sort out plane coming turning toward right really planes left means have push stick? Oh hell has crashed now anyway quick easy just push toward low wing need know left right Maybe thats problem Right quit getting much trouble began really enjoying flying wasnt getting closer making landings day later summer George Moger came over asked flying plane flying up doing usual aimless wandering routine did know what meant explained wasnt leading airplane just following around keep ing range wasnt trying anything keep crashing plane went wanted within radio range George said want solo have start making plane go directly point another fly predetermined route wandering chang ing course have accomplish order able set up landing approach course stay landing simply matter flying approach pattern lower lower until finally can just cut throttle let settle runway Well next few weeks flying pattern constantly remember first time came down runway 15 feet air thought skimming deck George usually would still yell him someone land thought fuel getting low day yelled George entered base leg said Cut throttle As did turned hand him transmitter walking away yelled just said Land kept walking Falcon rolled stop still its wheels piece happiest guy Linn County George Bill club now other guys around can much George Bill Jim others did Just give chance Happy landings Thanks Ed beginners can put selves article benefit Maybe epitaph some airplanes can postponed Speaking epitaphs John Thomas editor West Orange Sunfliers Orlando FL newsletter Sun beam published following RIP lies airplane red blue white turned left should have turned right last two weeks have enjoying new exciting phase radio control modeling purchased Kraft Eleck Rider motorcycle KP-2A radio systern After about three hours assembly cycle operating Continued page 96 26 Model Aviation Van Putte Mustang sports license plate 10 conTests aii over oeep uuth Ron says honk wave see car give him call CB airplanes may get crack two out coupie 01 keep going Celastic patches decorated Magic Marker ld Roberts ship looks luxurious nocing ne put iii painted interior adhesive sprinkled flocking Purchasing R/C Aircraft easy YOUNIQUE AT Hobby Capital keep large ready supply af Custom-Bilt RC Aircraft Kits Engines RC Units times And. thanks ta years af experience dealing people sections af US. prepare special ane-of-a-kind RC Aircraft far special one-ofa-kind RC Flyer wha demands unique laok express tastes Chances youll find custom paint finish exquisite detailed cockpit interiors glassed engine compartments real scale wheels custom grilled nose section will knock socks offi. youll probably never see another like cause Hobby Capitol expert stressed preparation goes far beyond standard checkout RC shoppers turning up increasing numbers convenient showroom because word out. outstanding buys service finest selection unique RC Aircraft anywhere its HOBBY CAPITOL Old Ignition Trode4n Buy sell old time ignition engines Box up what have send us honest appraisal could worth new proportional set have engines can also start collection welcome built-up airplanes used proportionals old time ignition engines Come trade us lop dollar paid Built Order Rons Kt stock choose Its s400OO Pipet Tri-Poce Quarter Scale 89 wingspan 42 Sq Ft detailed plans $1699 PR Send $i00 self addressed stamped envelope far detailed list Built-Up R/C Models ond 50% Sale Hobby Capitol 46 N Oak St Ventura CA 93001 Phone 805 643-7616 / 642-8465 efforts promote models look fly like full-size counterparts may finally blossom ing full bloom Las Vegas TOC thing andthe IMAC organization promoting aerobatic models have copies full scale machines CAP addition pack hopefully add pleasure others just did Glen Hazel Sig gang up Iowa doing share promote IMAC philosophy decide build CAP sashay up next year enjoy bash put benefit us modelers RC Aerobatics/Van Putte continued page 26 street front house said technique faultless beginning Eleck Rider performed perfectly Id half truthful cycle did perform perfectly technique left lot desired initially poor driving ability its advant ages Whenever lost control cycle spun out ran curb dashed under car clobbered mailbox post demonstrated durability system After two weeks hard use 13 novice drivers cycle has scuff marks acetate fairing evidence its hard life its tough first questions someone has never seen perform asks difficult keep upright answer very simple Its easy Unless driver does something upset cycle will happily drive forever straight line want turn thats different story Eleck Rider requires coordination ofthrottle steering negotiate turn tighter turn coordination required Steering accomplished turning front forlc done tilting fork front wheeVfork castered free turn direction So does cycle steer Very nicely thank extremely stable too have hit number obstructions include rocks manhole cover cracks pavement acorns jumping ramp etc very few exceptions cycle has stabilized itself motored electric motor operated servodriven rheostat throttle stick has spring return center Forward movement stick provides proportional forward speed Pulling back stick causes motor function like generator acts brake dead man throttle feature nice beginners since cycle will stop itself let go stick best place leam operate Eleck Rider large smooth area like parking lot Once driving proficiency achieved large area smaller places can tried out cycle started holding upright advancing throttle holding stable briefly acceler ates Initial operation should about R3 throttle gentle tums should attempted Sharper turns must accomplished throttling back turning cycle throttling up about halfway through turn slower cycle sharper turn can cycle will fall over gets too slow key success proper coordination throttle takes proficient RC pilot less half hour learn operate Eleck Rider Part problem RC newcomers will have deciding way move stick cycle heading toward An experienced pilot has advantage area because has already learned control airplane coming toward him Unfortunately old rule stick toward low wing doesnt help much motorcycle Am enjoying Eleck Rider Well weekday huny home work drive 30 minutes before gets dark weekends tough get chores done before taking out So far havent able racing others because first kid block have However several others way will probably racing around water-filled milk jugs local parking lot read Get case youve wondering next Pattern Problem Month will appear answer ts receive someone response request problems has very underwhelming Ron Von Puttg 12 Connie Drive Slzalimart FL 32579 Spin Tunnel Robelen continued page 24 good brands really am stuck Hot Stuff type glue truly superior Very light weight will never warp thinnest tail surface course dries immediately other brands Zap Jet etc areallfine Imsure Ijusthavenothadmuch experience Various finish techniques useful Sometimes apply coat sanding sealer Testors Hot Fuel Proof trim color am also pleased results using spray dyes use Deep-flex brand spray can found local variety store usual method construction start fuselage lightly tack glue two blocks together part vertical centerline first shape top view side view followed careful shaping 96 Model Aviation MAMMOTH SCALERS nce have available reeglete line enganeasmts alal eufflers enat 90 So 15 engines srsis OIaDRA WEBRA ar etc Wgite call far catalog emS price info Quarter Headquarters U 12321 5am raulmCaS4iI2 334,, contours After shaping pop blocks apart hollow out inside gouge blades nose area may left solidz however tail aft wing must quite light wing shaped suitable thickness balsa sheetfirst cutting planform forming airfoil finally setting dihedral place wings usually mounted cutting away appropriate area fuselage glueing wing place fairing necessary tail surfaces must very light therefore attempt form airfoil shapes etc Rather sand piece sheet balsa quite thin 0 10inch cut tail pieces fastened place tiny drops Hot Stuff finish may now applied after model ready balancing addition al ballasting scale weight etc As rule have able set control surfaces models moistening lightly bending have yet found need hinging controls nor could have built models good starting point controls set elevator up rudder spin direction ailerons against spinfor example up elevator left rudder right aileron aid launching made small paddle dowel handle wire rim fine mesh fabric center model placed nose facing launcher held open trap-door launching using finger same hand hold trap-door open model launched gently flicking wing tip finger other hand both starts model spinning propels tunnel throat trap-door allowed fall shut tunnel rpm adjusted balance spinning model Take word it whole lot easier show try describe old expression practice makes perfect really applies things happen pretty quickly As much research things always simple appear case am referring specific phenomena encounter ed tiny models cases models would maintain spin given set conditions though certain should looking answers already assuming lack agreement due Reynolds Number some other scaling effect Disturbing was still pleased overall effect models would spin smoothly fine demonstrations etc Playing hunch evening fastened strip scotch tape wing leading edges problem models form crude flap result dramatic model would spin readily rate spin spin angle-of-attack etc quite close what expected Fine tuning trimming tape produced flap about one-half wingspan one-tenth chord tape flaps place almost models will spin expected considering general lack knowledge prototype behavior effort better understand phenomena constructed small wing mounted force measurement scale another small wind tunnel Runs made tape flaps place As lift curves show lift developed especially higher angles attack such encountered tail spin will try draw lofty conclusions thisjust pass along data As photographs would indicate models patterned after current general aviation lightplanes has both good bad Bad because general lack information about spin behavior full scale aircraft prevents direct comparisons However category airplanes has areas March 1 980 97 Al Superiority HOT STUFE FOR THE MODELER WHO MUST HAVE MAXIMUM STRENGTH DEEP PENETRATION LIGHTEST WEIGHT VERSATILITY UNCOMPROMISING QUALITY INSTANTLY TIP BOOKLETS FREE ATOR YOUR HOBBY DEALER SEND SELF ADDRESSED STAMPED ENVELOPE TO iiGtfldO PROPELLERS Made polyester boil color Go GRISH propeller True helical pitch airfoil win-power Sizes pitches styles needs AT YOUR DEALER 2 Blade Tractor 5-3each 545354USc 63645Cc 747678Sc 8486887Cc 949-697 9810410-6Sc 11411-6118 *1 12412612-6815 2 Blade Pusher 5b3 5-4 6-36-4 Nc 8-6 Sc 9-610-681 3 Blade Tractor 53 6-364Nc 3 Blade Pusher 63Nc Metallic- Color Tractor 7678*1 8688*13 96 061041N Pusher06*15 design sensitivity small changes make dramatic differences tailspin behavior sensitive areas include wing airfoils wing location high wing low wing tail design fuselage contours especially behind wing control surface deflections C G location mass distri bution etc no perfect size spin models started models about two-in wingspan very convenient launching ease staying away tunnel walls recently have begun build larger models three-in wingspan have advantages easier construction possible interchangeable parts well being likely meet ballpark inertia requirements main drawback relates launching tunnel larger models tend strike walls easily sensitive design areas especially tailspin motions decided design own general aviation research modeL model theDBR-2 Special includes blend GRISH LARGE WOOD PROPELLERS HARDWOOD too hard minimizes chance costly plane engine damage True pitch airfoil fully finished balanced ready coating 3/8 BOREALL SIZES IN18 57 6 8 & 10 PITCH 20 8 22 10 24 13 RIGHT HAND TRACTOR BROS GRUSH ST JOHN INDIANA 46373 shapes found modern full-scale designs As drawn model portrays force set-up will tend have flat no-recovery spin mode may changed altering areas modeL have made several tail assemblies T-tail etc alone make dramatic differ ences spin behavior using basic model changing just piece time possible analyze results proposed design changes introducing too variables once also very interesting build actual scale models familiar airplanes Please very cautious about drawing conclusions live era product liability lawsuits simply amazing would want ever take chance falsely accusing brand airplane usual obstacle building scale models still applies namely lack information scrounging around have found several sources very helpful Jones Pocket Book Series great reference source some company brochures also excellent three-view drawings published various magazines Mass data typically hard find probably will require cross-referencing Generally published drawings larger desired larger cities will hae some photocopy machine capable making copies reduced size very 100 Model Aviation ALWAYS AVAILABLE AT YOUR HOBBY DEALER Satellite City PO Box 836 Simi CA 93065 805 522-0062 1 / 3 NEW SIZE IN 8 & 10 PITCH 26 $16 MINIATURE SPIN TUNNEL Model Test comparisons Models Approx 2 Wingspan ModelTunnel RPMSpin RateSpin AOA R PSDegrees Yankee #4 Tail410 0 85 Yankee #6 Tail610 50 ankee V Tail530 50 55 Yankee r Tail510 0 55 Sundowner520 30 35 PSU-1380 0- 75 BD-55580 5-80 BDSL480 5-80 F4U corsair580 5 50 cessnalso610 25-30 Piper Twin420 5 70 Variviggen520 30- 35 Zonker480Oscillatory VariezeNO SPIN handy shrinking job Photographic techniques would fine available use handy pocket calculator reduce dimensions draw plan grid paper As rule small detail may safely omitted antenna door latches etc changing results According tests NASA spin tunnel landing gear does affect model spin behavior measurable way reason leave delicate parts off models always refinements possible type project method measuring air velocity would real asset would method easily measuring spin rate models have experimented strobe light Seemingly no end variations possible project sort will always looking opportunities improve equipment techniques involved Maybe some day can find RC system tiny enough fit models could observe recovery behavior also Todays dream to-1 morrows project has theme through effort anyone would like correspond will try answer mail especially selfaddressed stamped envelope Happy spinning REFERENCES I Janet Pocket Book Series such Light Aircraft etc 2 Burt S M. Jr Bowman J S. Jr white E L SpinTunnel Investigation Spinning Characteristics Typical Single-Engine General Aviation Airplane Designs NASA Technical Paper 1009 September 1977 3 Beechcraft Today company hrochnre 4 Powers Bradford Ahout Size Model riarian January 1978 5 Powers Bradford Lets Talk About Reynolds Numbers Model Aviation February 1979 RC Pylon/Hager continued page 27 100% profit ideas get members wife bake cookies cupcakes brownies items sell very well 100% profit Always buy large size jars catsup mustard relish creamer sugar coffee Buy cups case What isnt used can saved another contest Dont sell items too high price want make profit dont overdo club can make several hundred dollars just well-run concession stand good example well-planned race annual Fort Wayne Flying Circuits Pylon Races run Jim Gager Jim club spend lot time before race day promoting As non-profit club can usually get free publicity local radio stations television helps promote sport gets public out see racing people also spend money club also gives out several hundred dollars prize money seems working year turn-out up 79 contest 28 entries Formula 36 entries Quarter Midget results Formula 11 Jim Moorehead 2 Bob Reuther 3 Dave Keats 4 Bill Johnason 5 Bob Onori 6 William Preis 7 Wayne Yeager 8 Eric Meyers 9 Al Grove 10 Art Arro Quarter Midget 1 Doug Bebensee 2 Duane Gall 3 Gail Jacobson 4 Dennis Sumner 5 Brian Richmond 6 Floyd Fitzgerald 7 Ken Heatlie 8 John Kilsdonk 9 Dave Timcoe 10 Allen Booth Any might have some ideas tips running successful race send will pass Bill Hager 4622 Bridgeport Dr Garland TX 75043 Inexpensive key word ACES new line R/C kits called Silver Series line offers unique combination value wide range versatility found todays R/C market until now cutting out biggeal costs Labor furnish kit furnish labor allows us give top-quality product inexpensive price comparable $800 radios its featuren * SERVO REVERSAL SWITCHES--With ists flip aft switch terso travel direcriae etch four psievasy channets rue reversed INDEPENDENT THROW ADJUST-On chavuels amount servo travel can cos stalled independeerty * EtETH CHANNEL ADItJST--Seeno position whea retract switch either le Up Down posirice ledepeedeutly adiastabte * TRtM LOCATtON rARtABLES-flee marion af trims us builders discrerivo cue have standard trim crossed trim cemhiaatioe two TRtM AUTI-IORITY PROORAMMABILITYBy ebasgiag plug-in lived resistors amouas remo esoursios whes tIre trims mooed programmable * DUAL RATE--Switches aed adiusemeet pats famished provide DUAL RATE up three channels EXPONENTIAL RATE OPTtONThis ptughs option provides ean-liarar servo teasel se klatioe snob movement up three vhannels 5t795 ELECTRONIC MIXER OPEIONWith plug-in modate two functices cue N k-i together tither onidirectiaerlly arhidireosioeally lSlt95 * PROGRAMMABLE PUSH BUTTON OPTION-te-tight adiustable peepeogeammed covasot surface muermena may obtained push g h $89 THE SILVER SEVEN $28495 Full ni cd system kit receiver four servos two classics Flyline Farman Moustique SEE YOUR LOCAL HOBBY DEALER send 25c catalog 34 span 020 power $1595 QUAKER FLASH single Channel nC Power free flight Y9 Wtngspan FLYLINE MODELS INC aaaa DORR AVENUE lB FAIRFAX VtAGINIA aunas 17031 5732t38 March 1980 101 Cheek wish Ane dealer metre naIl nomptate datailt crws S complete Catalogs $100 lasid $BOfo CaunMa urnl Box 511E 119W 19th. Higginsville Mo 64037 816 584-7121 COMING SOON 117e READY NOW
Edition: Model Aviation - 1980/03
Page Numbers: 20, 21, 22, 23, 24, 96, 97, 98, 99
both magazine state R IUJNN L art pleased present uniqu report As will see author brought work home him TAILSPIN Flat spin other performed deliberate tailspins some time during very rapidly nose-high attitude Generally related terms phrases associated sport fun flying session Occasionally attempts recover useless model important hut little understood area airplane spin begunusually anew design non- crashes Rare unusual No Mysterious flight Most us fly RC models have standard styling model will begin rotate Yes Lest modelers feel lonely designers About release model 2-in span PSU-1 0~rvihg spin test operation tinyPenn State University Dave prepares flickDave retrieves PSU-1 through hatch model plainly seen through windowleft wing tiptunnel bottom certainly tiny 20 Model Aviation full-scale aircraft occasionally experience same dilemma Perhaps can imagine results study research aircraft tailspins has subject much energetic effort research teams ofthe valuable facilities research type spin tunnel concept involves wind tunnel standing vertically air being drawn upward fan mounted top Models launched whirling motion like frisbee rising air within spin tunnel fan rpm adjusted just balance descent rate model being tested result opportunity closely study motion behavior model Research facilities nature quite rare being two free world NASA has Langley Field Virginia other located France NASA spin tunnel measures twenty feet across test chamber usual model size about two feet wingspan models equipped RC operate controls thus making possible study recovery behavior work NASA-Langley am often exposed spin-tunnel tests have become quite fascinated very safe method testing critical motions model airplanes Lacking priority compete testing time ADJUST GAP TO CALIBRATE RELAY COIL C7j37ORTH MAGNET 3N DIA1/8 THICK WOOD OR PLASTIC6O NI1N34A 0 PM 0 aN magnetic tachometer made Radio Shack parts Magnets glued plastic disk glued fan assembly Relay coil mounted wood cross member position coil tweaked achieve desired output meter C B H9 10 rH B25 RADIUS INSIDE 3 fA TUNNEL CROSS SECTIONS ALL DIMENSIONS ARE INSIDE tunnel made cardboard Plexiglass windows hinged strapping tape Masking tape liberally used hold things together along Titebond glue II 3 lur lower area rapidly spinning Beechcraft 33 right-turn spin RELAY COIL 8KfL vi IOmF c-c I5 F 15BB // AA / rirai evaion moaels aii Z- Span lop Bottom Bede BD5-J Cessna 150 Piper Arapahoe Penn State PS U-i 30 05 3M I--5 i ASIC WINC WFH urn / V /1/ / ESi VELOCITY 20 0 30 40 graph shows effect leading edge flaps wing lift Full-size airfoil top right NASA spin tunnel began wonder about constructing very own having budget federal agency began realize spin tunnel would have just bit smaller perhaps little less elegant search house shop tumed up floor fan 20-inch diameter blades variable transformer controlled just fine Finding contours wind tunnels small sizes rather tricky business chose cardboard structural material avail able wherever grocery stores found easily modified miniature spin tunnel scale model larger unit specific design tailored job intended detailed construction article therefore will speak general terms omit detailed construction information spin tunnel fashioned cardboard has Plexiglass viewing windows used jigsaw cut launching hatch window hinged strapping tape Masking tape used jiberally hold things together along Titebond glue Strips wood support fan unit top well providing bottom frame legs flow-straightener grid bottom too may cardboard silk-like polyester fabric net stretched across grid serves two purposes smooth airflow catch models bottom rather large hatch cut bottom cone purpose retrieving 22 Model Aviation 8 6 CL / f. / oz U UlO rz z 0 C I1 0 0 I1 IThe launch padd9e Model placed nose facing launcher held theopentrapdoor launching using finger same hand hold open door Tools used making miniscule planes scales Iauncn paddle Models Mooney M2OC left four 2- span Yankees variety tail configurations EAA biplane 0-1 gram scale6-in machiniaL rule ulCyluUllu models desk lamp borrowed son s room used light jAterior painted interior flat black could see models spray-painted outside silver aerosol canlooks better assorted grocery cartons tachometer shown constructed parts purchased local Radio Shack store See sketch schematic details magnets glued plastic disk glued fan assembly mounted relay coil wooden cross-member tweaked position coil achieve desired output meter As spin tunnel began taking shape became obvious size models would quite small experience industrial test models aware need properly scale weight balance inertias dimensions spin test models measure values another matter have found six-inch long machinists ruler best friend measur ing tiny model dimensions can bought graduations / 100-inch found wherever machinist tools sold Try Sears Roebuck Measuring weight another problemi General ly complete model will weigh between one-tenth N I IIII liii I I Ifer 800 600 1 0 20C 0 j K MINIATURE SPIN TUNNEL MAXIMUM OUTPUT 21FPS AT 980 RPM inL --II 12 16 VELOCITY RPS graph provides values air velocity ft/sec read against rpm fan gram gram depending model scale prototype weight solution construct scales job simple spring wire scale shown handy weighing parts quickly during construction exotic beam scale super weighing complete models Check drawings specific details scale custom job Construction follows same theme specific variations noted Generally used Hot Stuff type glue throughout bonding 20 halta wood structure beam scale pivots two strips copper wire resting new razor blade no nicks please Calibration tiny scales accomplish ed follows length 1/32-in wire solder trimmed until weighed exactly gramlocal druggist piece measured length recorded Short pieces solder cut length one-tenth long 1/100 full length gave calibration weights Balance Notes 1 balsa 2 Assemble Hot Stuff 3 Two slide weights ten times weight other 4 Lead counterweight just balances 5 Maximum range determined slide-weights Dave sets balance 1 gram pan both maximum travel Again reduce size drawing Bottom piece plus 3/16 sq right measures B inches 1/32 PAN I/16X 1/16 / STOP PINS 0 3116x 3/16 3/16X 3/40 V March 1980 23 0 Three 2-in canards top bottom Zonker Rutan Variviggen Rutan VariEze COUNTER WEIGHTSLIDE WEIGHTS -TWO WIRE BEARINGS DBR-2 Special hypothetical full-scale prototype Span 25 ft area 104 sq ft. weight 1500 lbs Model 1/100th scale Span 3 in. area 15 sq weight 68 grams CG 25% chord As shown model should have flat no-recovery spin mode moving stab higher T-tail interesting effect would immediately noticed .-i ri-rn PANJ} 1132 H 1/32 X 3/16 x 112 ALL WOCO IS BALSA I/ l14X 3/4e BASE WIRE WITHOUT PAN 3/l6aX 3/16 gram one-tenth gram 1/100 gram used calibrating marks various scale bars Checking balance tiny models also requires special set-up None old fingertip under wingtips use 020-in music wire length wire passing through fuselage desired balance location Two lengths wire glued strip wood model suspended across handiest material ballast thin lead cut small slivers pointed shapes push nose needed trimming lead until model hangs level balance wires aircraft spinning moments inertia about various axis have major influence spin behavior value have developed proper technique measur ing would appreciate suggestions present method construct models simulate empty weight prototype airplane add weight center model until matches scale gross weight prototype Additionally distribution mass prototype must considered since twinengine design tip tanks will very different single-engine planes respect Construction dwarf scale models much less difficult first appearances Real ly patient reader will share some techniques hope shedding some light matter tools expensive exotic yet has purpose Tweezers nearly essential really sharp knife prefer Uber Skiver No 11 blade however really sharp X-Acto will job too Good sharp single-edge razor blades always handy especially broken special shapes pliers hollow out fuselages models X-Acto gouges great usual sanding blocks out question use sandpaper glued onto coffee stirring sticks can made up shapes different sandpaper grits six-in ruler just right measurements magnifying glass real asset Any other tools equipment found under miscellaneous pins razor saw etc Balsa wood favorite material far just has lightest easiest working material available tiny models require little sheet seems last forever am real choosy wood selecting clear-grained unwarped extremely light stock favorite Sig Contest Balsa although plenty Continued page 96 Scale calibrated short lengths wire solder Ex 125 1/32 solder equals 1 gram 125 equals 01 gram could show drawing full-size prepared author dimensions base piece rear upright both 4 inches 24 Model Aviation Beechcraft Sundowner 0-25 gram springwire scales Dave dreams someday finding RC system fit little aircraftJ DRAWN FULL SIZE QL ii L OPTIONAL TAPE FLAPS QHARP A-A CORNER 3FA -LA II 0 5 dii SPORT AEROBATICS Ron Van Putte COUPLE months ago 1 mentioned instructor problem some clubs have tunately club has excellent instruction program beginners largely due enthusiasm club instructors feature program other clubs might like copy awarding solo certificates novice pilot instructor club meeting Blank certificates printed up club president Ed Moorman AMA DistrictS AVP North Florida Ed types appropriate information about novice pilot gives completed certificate instructor presentation Both novice pilots instructors like idea club might like try too Good instructors leave helpful hints students reading club newsletters ModelAviations publisher Carl Wheeley sends came across great article Ed Cocciola Cedar Rapids low Skyhawks newsletter Logbook good advice contained Eds article bears repeating printing slightly edited version Notes Novices Since 1973 have seen lot Skyhawks pass through club Some made quite contribution own way talking about couple dont mean slight ofthose dont mention also made contribution said have reason bringing up particular ones wanting solo summer still needed someone take off after wandering around sky fur 10 15 minutes Id yell someone land Sound familiar bet doing since summer before day plane starting spin trying figure out should giving left turn right turn Bill Birkey grabbed trans mitter straightened Out regained lost altitude still wasnt flying less three mistakes high done count less times before Jim Clark once grabbed transmitter pulled Falcon 56 out spin about four feet off deck day stood watching crash However Bill Birkey did something different stuck handed back transmitter day said shes coming Ed watch low wing straighten up just push stick low wing Now isnt simple time trying mentally sort out plane coming turning toward right really planes left means have push stick? Oh hell has crashed now anyway quick easy just push toward low wing need know left right Maybe thats problem Right quit getting much trouble began really enjoying flying wasnt getting closer making landings day later summer George Moger came over asked flying plane flying up doing usual aimless wandering routine did know what meant explained wasnt leading airplane just following around keep ing range wasnt trying anything keep crashing plane went wanted within radio range George said want solo have start making plane go directly point another fly predetermined route wandering chang ing course have accomplish order able set up landing approach course stay landing simply matter flying approach pattern lower lower until finally can just cut throttle let settle runway Well next few weeks flying pattern constantly remember first time came down runway 15 feet air thought skimming deck George usually would still yell him someone land thought fuel getting low day yelled George entered base leg said Cut throttle As did turned hand him transmitter walking away yelled just said Land kept walking Falcon rolled stop still its wheels piece happiest guy Linn County George Bill club now other guys around can much George Bill Jim others did Just give chance Happy landings Thanks Ed beginners can put selves article benefit Maybe epitaph some airplanes can postponed Speaking epitaphs John Thomas editor West Orange Sunfliers Orlando FL newsletter Sun beam published following RIP lies airplane red blue white turned left should have turned right last two weeks have enjoying new exciting phase radio control modeling purchased Kraft Eleck Rider motorcycle KP-2A radio systern After about three hours assembly cycle operating Continued page 96 26 Model Aviation Van Putte Mustang sports license plate 10 conTests aii over oeep uuth Ron says honk wave see car give him call CB airplanes may get crack two out coupie 01 keep going Celastic patches decorated Magic Marker ld Roberts ship looks luxurious nocing ne put iii painted interior adhesive sprinkled flocking Purchasing R/C Aircraft easy YOUNIQUE AT Hobby Capital keep large ready supply af Custom-Bilt RC Aircraft Kits Engines RC Units times And. thanks ta years af experience dealing people sections af US. prepare special ane-of-a-kind RC Aircraft far special one-ofa-kind RC Flyer wha demands unique laok express tastes Chances youll find custom paint finish exquisite detailed cockpit interiors glassed engine compartments real scale wheels custom grilled nose section will knock socks offi. youll probably never see another like cause Hobby Capitol expert stressed preparation goes far beyond standard checkout RC shoppers turning up increasing numbers convenient showroom because word out. outstanding buys service finest selection unique RC Aircraft anywhere its HOBBY CAPITOL Old Ignition Trode4n Buy sell old time ignition engines Box up what have send us honest appraisal could worth new proportional set have engines can also start collection welcome built-up airplanes used proportionals old time ignition engines Come trade us lop dollar paid Built Order Rons Kt stock choose Its s400OO Pipet Tri-Poce Quarter Scale 89 wingspan 42 Sq Ft detailed plans $1699 PR Send $i00 self addressed stamped envelope far detailed list Built-Up R/C Models ond 50% Sale Hobby Capitol 46 N Oak St Ventura CA 93001 Phone 805 643-7616 / 642-8465 efforts promote models look fly like full-size counterparts may finally blossom ing full bloom Las Vegas TOC thing andthe IMAC organization promoting aerobatic models have copies full scale machines CAP addition pack hopefully add pleasure others just did Glen Hazel Sig gang up Iowa doing share promote IMAC philosophy decide build CAP sashay up next year enjoy bash put benefit us modelers RC Aerobatics/Van Putte continued page 26 street front house said technique faultless beginning Eleck Rider performed perfectly Id half truthful cycle did perform perfectly technique left lot desired initially poor driving ability its advant ages Whenever lost control cycle spun out ran curb dashed under car clobbered mailbox post demonstrated durability system After two weeks hard use 13 novice drivers cycle has scuff marks acetate fairing evidence its hard life its tough first questions someone has never seen perform asks difficult keep upright answer very simple Its easy Unless driver does something upset cycle will happily drive forever straight line want turn thats different story Eleck Rider requires coordination ofthrottle steering negotiate turn tighter turn coordination required Steering accomplished turning front forlc done tilting fork front wheeVfork castered free turn direction So does cycle steer Very nicely thank extremely stable too have hit number obstructions include rocks manhole cover cracks pavement acorns jumping ramp etc very few exceptions cycle has stabilized itself motored electric motor operated servodriven rheostat throttle stick has spring return center Forward movement stick provides proportional forward speed Pulling back stick causes motor function like generator acts brake dead man throttle feature nice beginners since cycle will stop itself let go stick best place leam operate Eleck Rider large smooth area like parking lot Once driving proficiency achieved large area smaller places can tried out cycle started holding upright advancing throttle holding stable briefly acceler ates Initial operation should about R3 throttle gentle tums should attempted Sharper turns must accomplished throttling back turning cycle throttling up about halfway through turn slower cycle sharper turn can cycle will fall over gets too slow key success proper coordination throttle takes proficient RC pilot less half hour learn operate Eleck Rider Part problem RC newcomers will have deciding way move stick cycle heading toward An experienced pilot has advantage area because has already learned control airplane coming toward him Unfortunately old rule stick toward low wing doesnt help much motorcycle Am enjoying Eleck Rider Well weekday huny home work drive 30 minutes before gets dark weekends tough get chores done before taking out So far havent able racing others because first kid block have However several others way will probably racing around water-filled milk jugs local parking lot read Get case youve wondering next Pattern Problem Month will appear answer ts receive someone response request problems has very underwhelming Ron Von Puttg 12 Connie Drive Slzalimart FL 32579 Spin Tunnel Robelen continued page 24 good brands really am stuck Hot Stuff type glue truly superior Very light weight will never warp thinnest tail surface course dries immediately other brands Zap Jet etc areallfine Imsure Ijusthavenothadmuch experience Various finish techniques useful Sometimes apply coat sanding sealer Testors Hot Fuel Proof trim color am also pleased results using spray dyes use Deep-flex brand spray can found local variety store usual method construction start fuselage lightly tack glue two blocks together part vertical centerline first shape top view side view followed careful shaping 96 Model Aviation MAMMOTH SCALERS nce have available reeglete line enganeasmts alal eufflers enat 90 So 15 engines srsis OIaDRA WEBRA ar etc Wgite call far catalog emS price info Quarter Headquarters U 12321 5am raulmCaS4iI2 334,, contours After shaping pop blocks apart hollow out inside gouge blades nose area may left solidz however tail aft wing must quite light wing shaped suitable thickness balsa sheetfirst cutting planform forming airfoil finally setting dihedral place wings usually mounted cutting away appropriate area fuselage glueing wing place fairing necessary tail surfaces must very light therefore attempt form airfoil shapes etc Rather sand piece sheet balsa quite thin 0 10inch cut tail pieces fastened place tiny drops Hot Stuff finish may now applied after model ready balancing addition al ballasting scale weight etc As rule have able set control surfaces models moistening lightly bending have yet found need hinging controls nor could have built models good starting point controls set elevator up rudder spin direction ailerons against spinfor example up elevator left rudder right aileron aid launching made small paddle dowel handle wire rim fine mesh fabric center model placed nose facing launcher held open trap-door launching using finger same hand hold trap-door open model launched gently flicking wing tip finger other hand both starts model spinning propels tunnel throat trap-door allowed fall shut tunnel rpm adjusted balance spinning model Take word it whole lot easier show try describe old expression practice makes perfect really applies things happen pretty quickly As much research things always simple appear case am referring specific phenomena encounter ed tiny models cases models would maintain spin given set conditions though certain should looking answers already assuming lack agreement due Reynolds Number some other scaling effect Disturbing was still pleased overall effect models would spin smoothly fine demonstrations etc Playing hunch evening fastened strip scotch tape wing leading edges problem models form crude flap result dramatic model would spin readily rate spin spin angle-of-attack etc quite close what expected Fine tuning trimming tape produced flap about one-half wingspan one-tenth chord tape flaps place almost models will spin expected considering general lack knowledge prototype behavior effort better understand phenomena constructed small wing mounted force measurement scale another small wind tunnel Runs made tape flaps place As lift curves show lift developed especially higher angles attack such encountered tail spin will try draw lofty conclusions thisjust pass along data As photographs would indicate models patterned after current general aviation lightplanes has both good bad Bad because general lack information about spin behavior full scale aircraft prevents direct comparisons However category airplanes has areas March 1 980 97 Al Superiority HOT STUFE FOR THE MODELER WHO MUST HAVE MAXIMUM STRENGTH DEEP PENETRATION LIGHTEST WEIGHT VERSATILITY UNCOMPROMISING QUALITY INSTANTLY TIP BOOKLETS FREE ATOR YOUR HOBBY DEALER SEND SELF ADDRESSED STAMPED ENVELOPE TO iiGtfldO PROPELLERS Made polyester boil color Go GRISH propeller True helical pitch airfoil win-power Sizes pitches styles needs AT YOUR DEALER 2 Blade Tractor 5-3each 545354USc 63645Cc 747678Sc 8486887Cc 949-697 9810410-6Sc 11411-6118 *1 12412612-6815 2 Blade Pusher 5b3 5-4 6-36-4 Nc 8-6 Sc 9-610-681 3 Blade Tractor 53 6-364Nc 3 Blade Pusher 63Nc Metallic- Color Tractor 7678*1 8688*13 96 061041N Pusher06*15 design sensitivity small changes make dramatic differences tailspin behavior sensitive areas include wing airfoils wing location high wing low wing tail design fuselage contours especially behind wing control surface deflections C G location mass distri bution etc no perfect size spin models started models about two-in wingspan very convenient launching ease staying away tunnel walls recently have begun build larger models three-in wingspan have advantages easier construction possible interchangeable parts well being likely meet ballpark inertia requirements main drawback relates launching tunnel larger models tend strike walls easily sensitive design areas especially tailspin motions decided design own general aviation research modeL model theDBR-2 Special includes blend GRISH LARGE WOOD PROPELLERS HARDWOOD too hard minimizes chance costly plane engine damage True pitch airfoil fully finished balanced ready coating 3/8 BOREALL SIZES IN18 57 6 8 & 10 PITCH 20 8 22 10 24 13 RIGHT HAND TRACTOR BROS GRUSH ST JOHN INDIANA 46373 shapes found modern full-scale designs As drawn model portrays force set-up will tend have flat no-recovery spin mode may changed altering areas modeL have made several tail assemblies T-tail etc alone make dramatic differ ences spin behavior using basic model changing just piece time possible analyze results proposed design changes introducing too variables once also very interesting build actual scale models familiar airplanes Please very cautious about drawing conclusions live era product liability lawsuits simply amazing would want ever take chance falsely accusing brand airplane usual obstacle building scale models still applies namely lack information scrounging around have found several sources very helpful Jones Pocket Book Series great reference source some company brochures also excellent three-view drawings published various magazines Mass data typically hard find probably will require cross-referencing Generally published drawings larger desired larger cities will hae some photocopy machine capable making copies reduced size very 100 Model Aviation ALWAYS AVAILABLE AT YOUR HOBBY DEALER Satellite City PO Box 836 Simi CA 93065 805 522-0062 1 / 3 NEW SIZE IN 8 & 10 PITCH 26 $16 MINIATURE SPIN TUNNEL Model Test comparisons Models Approx 2 Wingspan ModelTunnel RPMSpin RateSpin AOA R PSDegrees Yankee #4 Tail410 0 85 Yankee #6 Tail610 50 ankee V Tail530 50 55 Yankee r Tail510 0 55 Sundowner520 30 35 PSU-1380 0- 75 BD-55580 5-80 BDSL480 5-80 F4U corsair580 5 50 cessnalso610 25-30 Piper Twin420 5 70 Variviggen520 30- 35 Zonker480Oscillatory VariezeNO SPIN handy shrinking job Photographic techniques would fine available use handy pocket calculator reduce dimensions draw plan grid paper As rule small detail may safely omitted antenna door latches etc changing results According tests NASA spin tunnel landing gear does affect model spin behavior measurable way reason leave delicate parts off models always refinements possible type project method measuring air velocity would real asset would method easily measuring spin rate models have experimented strobe light Seemingly no end variations possible project sort will always looking opportunities improve equipment techniques involved Maybe some day can find RC system tiny enough fit models could observe recovery behavior also Todays dream to-1 morrows project has theme through effort anyone would like correspond will try answer mail especially selfaddressed stamped envelope Happy spinning REFERENCES I Janet Pocket Book Series such Light Aircraft etc 2 Burt S M. Jr Bowman J S. Jr white E L SpinTunnel Investigation Spinning Characteristics Typical Single-Engine General Aviation Airplane Designs NASA Technical Paper 1009 September 1977 3 Beechcraft Today company hrochnre 4 Powers Bradford Ahout Size Model riarian January 1978 5 Powers Bradford Lets Talk About Reynolds Numbers Model Aviation February 1979 RC Pylon/Hager continued page 27 100% profit ideas get members wife bake cookies cupcakes brownies items sell very well 100% profit Always buy large size jars catsup mustard relish creamer sugar coffee Buy cups case What isnt used can saved another contest Dont sell items too high price want make profit dont overdo club can make several hundred dollars just well-run concession stand good example well-planned race annual Fort Wayne Flying Circuits Pylon Races run Jim Gager Jim club spend lot time before race day promoting As non-profit club can usually get free publicity local radio stations television helps promote sport gets public out see racing people also spend money club also gives out several hundred dollars prize money seems working year turn-out up 79 contest 28 entries Formula 36 entries Quarter Midget results Formula 11 Jim Moorehead 2 Bob Reuther 3 Dave Keats 4 Bill Johnason 5 Bob Onori 6 William Preis 7 Wayne Yeager 8 Eric Meyers 9 Al Grove 10 Art Arro Quarter Midget 1 Doug Bebensee 2 Duane Gall 3 Gail Jacobson 4 Dennis Sumner 5 Brian Richmond 6 Floyd Fitzgerald 7 Ken Heatlie 8 John Kilsdonk 9 Dave Timcoe 10 Allen Booth Any might have some ideas tips running successful race send will pass Bill Hager 4622 Bridgeport Dr Garland TX 75043 Inexpensive key word ACES new line R/C kits called Silver Series line offers unique combination value wide range versatility found todays R/C market until now cutting out biggeal costs Labor furnish kit furnish labor allows us give top-quality product inexpensive price comparable $800 radios its featuren * SERVO REVERSAL SWITCHES--With ists flip aft switch terso travel direcriae etch four psievasy channets rue reversed INDEPENDENT THROW ADJUST-On chavuels amount servo travel can cos stalled independeerty * EtETH CHANNEL ADItJST--Seeno position whea retract switch either le Up Down posirice ledepeedeutly adiastabte * TRtM LOCATtON rARtABLES-flee marion af trims us builders discrerivo cue have standard trim crossed trim cemhiaatioe two TRtM AUTI-IORITY PROORAMMABILITYBy ebasgiag plug-in lived resistors amouas remo esoursios whes tIre trims mooed programmable * DUAL RATE--Switches aed adiusemeet pats famished provide DUAL RATE up three channels EXPONENTIAL RATE OPTtONThis ptughs option provides ean-liarar servo teasel se klatioe snob movement up three vhannels 5t795 ELECTRONIC MIXER OPEIONWith plug-in modate two functices cue N k-i together tither onidirectiaerlly arhidireosioeally lSlt95 * PROGRAMMABLE PUSH BUTTON OPTION-te-tight adiustable peepeogeammed covasot surface muermena may obtained push g h $89 THE SILVER SEVEN $28495 Full ni cd system kit receiver four servos two classics Flyline Farman Moustique SEE YOUR LOCAL HOBBY DEALER send 25c catalog 34 span 020 power $1595 QUAKER FLASH single Channel nC Power free flight Y9 Wtngspan FLYLINE MODELS INC aaaa DORR AVENUE lB FAIRFAX VtAGINIA aunas 17031 5732t38 March 1980 101 Cheek wish Ane dealer metre naIl nomptate datailt crws S complete Catalogs $100 lasid $BOfo CaunMa urnl Box 511E 119W 19th. Higginsville Mo 64037 816 584-7121 COMING SOON 117e READY NOW
Edition: Model Aviation - 1980/03
Page Numbers: 20, 21, 22, 23, 24, 96, 97, 98, 99
both magazine state R IUJNN L art pleased present uniqu report As will see author brought work home him TAILSPIN Flat spin other performed deliberate tailspins some time during very rapidly nose-high attitude Generally related terms phrases associated sport fun flying session Occasionally attempts recover useless model important hut little understood area airplane spin begunusually anew design non- crashes Rare unusual No Mysterious flight Most us fly RC models have standard styling model will begin rotate Yes Lest modelers feel lonely designers About release model 2-in span PSU-1 0~rvihg spin test operation tinyPenn State University Dave prepares flickDave retrieves PSU-1 through hatch model plainly seen through windowleft wing tiptunnel bottom certainly tiny 20 Model Aviation full-scale aircraft occasionally experience same dilemma Perhaps can imagine results study research aircraft tailspins has subject much energetic effort research teams ofthe valuable facilities research type spin tunnel concept involves wind tunnel standing vertically air being drawn upward fan mounted top Models launched whirling motion like frisbee rising air within spin tunnel fan rpm adjusted just balance descent rate model being tested result opportunity closely study motion behavior model Research facilities nature quite rare being two free world NASA has Langley Field Virginia other located France NASA spin tunnel measures twenty feet across test chamber usual model size about two feet wingspan models equipped RC operate controls thus making possible study recovery behavior work NASA-Langley am often exposed spin-tunnel tests have become quite fascinated very safe method testing critical motions model airplanes Lacking priority compete testing time ADJUST GAP TO CALIBRATE RELAY COIL C7j37ORTH MAGNET 3N DIA1/8 THICK WOOD OR PLASTIC6O NI1N34A 0 PM 0 aN magnetic tachometer made Radio Shack parts Magnets glued plastic disk glued fan assembly Relay coil mounted wood cross member position coil tweaked achieve desired output meter C B H9 10 rH B25 RADIUS INSIDE 3 fA TUNNEL CROSS SECTIONS ALL DIMENSIONS ARE INSIDE tunnel made cardboard Plexiglass windows hinged strapping tape Masking tape liberally used hold things together along Titebond glue II 3 lur lower area rapidly spinning Beechcraft 33 right-turn spin RELAY COIL 8KfL vi IOmF c-c I5 F 15BB // AA / rirai evaion moaels aii Z- Span lop Bottom Bede BD5-J Cessna 150 Piper Arapahoe Penn State PS U-i 30 05 3M I--5 i ASIC WINC WFH urn / V /1/ / ESi VELOCITY 20 0 30 40 graph shows effect leading edge flaps wing lift Full-size airfoil top right NASA spin tunnel began wonder about constructing very own having budget federal agency began realize spin tunnel would have just bit smaller perhaps little less elegant search house shop tumed up floor fan 20-inch diameter blades variable transformer controlled just fine Finding contours wind tunnels small sizes rather tricky business chose cardboard structural material avail able wherever grocery stores found easily modified miniature spin tunnel scale model larger unit specific design tailored job intended detailed construction article therefore will speak general terms omit detailed construction information spin tunnel fashioned cardboard has Plexiglass viewing windows used jigsaw cut launching hatch window hinged strapping tape Masking tape used jiberally hold things together along Titebond glue Strips wood support fan unit top well providing bottom frame legs flow-straightener grid bottom too may cardboard silk-like polyester fabric net stretched across grid serves two purposes smooth airflow catch models bottom rather large hatch cut bottom cone purpose retrieving 22 Model Aviation 8 6 CL / f. / oz U UlO rz z 0 C I1 0 0 I1 IThe launch padd9e Model placed nose facing launcher held theopentrapdoor launching using finger same hand hold open door Tools used making miniscule planes scales Iauncn paddle Models Mooney M2OC left four 2- span Yankees variety tail configurations EAA biplane 0-1 gram scale6-in machiniaL rule ulCyluUllu models desk lamp borrowed son s room used light jAterior painted interior flat black could see models spray-painted outside silver aerosol canlooks better assorted grocery cartons tachometer shown constructed parts purchased local Radio Shack store See sketch schematic details magnets glued plastic disk glued fan assembly mounted relay coil wooden cross-member tweaked position coil achieve desired output meter As spin tunnel began taking shape became obvious size models would quite small experience industrial test models aware need properly scale weight balance inertias dimensions spin test models measure values another matter have found six-inch long machinists ruler best friend measur ing tiny model dimensions can bought graduations / 100-inch found wherever machinist tools sold Try Sears Roebuck Measuring weight another problemi General ly complete model will weigh between one-tenth N I IIII liii I I Ifer 800 600 1 0 20C 0 j K MINIATURE SPIN TUNNEL MAXIMUM OUTPUT 21FPS AT 980 RPM inL --II 12 16 VELOCITY RPS graph provides values air velocity ft/sec read against rpm fan gram gram depending model scale prototype weight solution construct scales job simple spring wire scale shown handy weighing parts quickly during construction exotic beam scale super weighing complete models Check drawings specific details scale custom job Construction follows same theme specific variations noted Generally used Hot Stuff type glue throughout bonding 20 halta wood structure beam scale pivots two strips copper wire resting new razor blade no nicks please Calibration tiny scales accomplish ed follows length 1/32-in wire solder trimmed until weighed exactly gramlocal druggist piece measured length recorded Short pieces solder cut length one-tenth long 1/100 full length gave calibration weights Balance Notes 1 balsa 2 Assemble Hot Stuff 3 Two slide weights ten times weight other 4 Lead counterweight just balances 5 Maximum range determined slide-weights Dave sets balance 1 gram pan both maximum travel Again reduce size drawing Bottom piece plus 3/16 sq right measures B inches 1/32 PAN I/16X 1/16 / STOP PINS 0 3116x 3/16 3/16X 3/40 V March 1980 23 0 Three 2-in canards top bottom Zonker Rutan Variviggen Rutan VariEze COUNTER WEIGHTSLIDE WEIGHTS -TWO WIRE BEARINGS DBR-2 Special hypothetical full-scale prototype Span 25 ft area 104 sq ft. weight 1500 lbs Model 1/100th scale Span 3 in. area 15 sq weight 68 grams CG 25% chord As shown model should have flat no-recovery spin mode moving stab higher T-tail interesting effect would immediately noticed .-i ri-rn PANJ} 1132 H 1/32 X 3/16 x 112 ALL WOCO IS BALSA I/ l14X 3/4e BASE WIRE WITHOUT PAN 3/l6aX 3/16 gram one-tenth gram 1/100 gram used calibrating marks various scale bars Checking balance tiny models also requires special set-up None old fingertip under wingtips use 020-in music wire length wire passing through fuselage desired balance location Two lengths wire glued strip wood model suspended across handiest material ballast thin lead cut small slivers pointed shapes push nose needed trimming lead until model hangs level balance wires aircraft spinning moments inertia about various axis have major influence spin behavior value have developed proper technique measur ing would appreciate suggestions present method construct models simulate empty weight prototype airplane add weight center model until matches scale gross weight prototype Additionally distribution mass prototype must considered since twinengine design tip tanks will very different single-engine planes respect Construction dwarf scale models much less difficult first appearances Real ly patient reader will share some techniques hope shedding some light matter tools expensive exotic yet has purpose Tweezers nearly essential really sharp knife prefer Uber Skiver No 11 blade however really sharp X-Acto will job too Good sharp single-edge razor blades always handy especially broken special shapes pliers hollow out fuselages models X-Acto gouges great usual sanding blocks out question use sandpaper glued onto coffee stirring sticks can made up shapes different sandpaper grits six-in ruler just right measurements magnifying glass real asset Any other tools equipment found under miscellaneous pins razor saw etc Balsa wood favorite material far just has lightest easiest working material available tiny models require little sheet seems last forever am real choosy wood selecting clear-grained unwarped extremely light stock favorite Sig Contest Balsa although plenty Continued page 96 Scale calibrated short lengths wire solder Ex 125 1/32 solder equals 1 gram 125 equals 01 gram could show drawing full-size prepared author dimensions base piece rear upright both 4 inches 24 Model Aviation Beechcraft Sundowner 0-25 gram springwire scales Dave dreams someday finding RC system fit little aircraftJ DRAWN FULL SIZE QL ii L OPTIONAL TAPE FLAPS QHARP A-A CORNER 3FA -LA II 0 5 dii SPORT AEROBATICS Ron Van Putte COUPLE months ago 1 mentioned instructor problem some clubs have tunately club has excellent instruction program beginners largely due enthusiasm club instructors feature program other clubs might like copy awarding solo certificates novice pilot instructor club meeting Blank certificates printed up club president Ed Moorman AMA DistrictS AVP North Florida Ed types appropriate information about novice pilot gives completed certificate instructor presentation Both novice pilots instructors like idea club might like try too Good instructors leave helpful hints students reading club newsletters ModelAviations publisher Carl Wheeley sends came across great article Ed Cocciola Cedar Rapids low Skyhawks newsletter Logbook good advice contained Eds article bears repeating printing slightly edited version Notes Novices Since 1973 have seen lot Skyhawks pass through club Some made quite contribution own way talking about couple dont mean slight ofthose dont mention also made contribution said have reason bringing up particular ones wanting solo summer still needed someone take off after wandering around sky fur 10 15 minutes Id yell someone land Sound familiar bet doing since summer before day plane starting spin trying figure out should giving left turn right turn Bill Birkey grabbed trans mitter straightened Out regained lost altitude still wasnt flying less three mistakes high done count less times before Jim Clark once grabbed transmitter pulled Falcon 56 out spin about four feet off deck day stood watching crash However Bill Birkey did something different stuck handed back transmitter day said shes coming Ed watch low wing straighten up just push stick low wing Now isnt simple time trying mentally sort out plane coming turning toward right really planes left means have push stick? Oh hell has crashed now anyway quick easy just push toward low wing need know left right Maybe thats problem Right quit getting much trouble began really enjoying flying wasnt getting closer making landings day later summer George Moger came over asked flying plane flying up doing usual aimless wandering routine did know what meant explained wasnt leading airplane just following around keep ing range wasnt trying anything keep crashing plane went wanted within radio range George said want solo have start making plane go directly point another fly predetermined route wandering chang ing course have accomplish order able set up landing approach course stay landing simply matter flying approach pattern lower lower until finally can just cut throttle let settle runway Well next few weeks flying pattern constantly remember first time came down runway 15 feet air thought skimming deck George usually would still yell him someone land thought fuel getting low day yelled George entered base leg said Cut throttle As did turned hand him transmitter walking away yelled just said Land kept walking Falcon rolled stop still its wheels piece happiest guy Linn County George Bill club now other guys around can much George Bill Jim others did Just give chance Happy landings Thanks Ed beginners can put selves article benefit Maybe epitaph some airplanes can postponed Speaking epitaphs John Thomas editor West Orange Sunfliers Orlando FL newsletter Sun beam published following RIP lies airplane red blue white turned left should have turned right last two weeks have enjoying new exciting phase radio control modeling purchased Kraft Eleck Rider motorcycle KP-2A radio systern After about three hours assembly cycle operating Continued page 96 26 Model Aviation Van Putte Mustang sports license plate 10 conTests aii over oeep uuth Ron says honk wave see car give him call CB airplanes may get crack two out coupie 01 keep going Celastic patches decorated Magic Marker ld Roberts ship looks luxurious nocing ne put iii painted interior adhesive sprinkled flocking Purchasing R/C Aircraft easy YOUNIQUE AT Hobby Capital keep large ready supply af Custom-Bilt RC Aircraft Kits Engines RC Units times And. thanks ta years af experience dealing people sections af US. prepare special ane-of-a-kind RC Aircraft far special one-ofa-kind RC Flyer wha demands unique laok express tastes Chances youll find custom paint finish exquisite detailed cockpit interiors glassed engine compartments real scale wheels custom grilled nose section will knock socks offi. youll probably never see another like cause Hobby Capitol expert stressed preparation goes far beyond standard checkout RC shoppers turning up increasing numbers convenient showroom because word out. outstanding buys service finest selection unique RC Aircraft anywhere its HOBBY CAPITOL Old Ignition Trode4n Buy sell old time ignition engines Box up what have send us honest appraisal could worth new proportional set have engines can also start collection welcome built-up airplanes used proportionals old time ignition engines Come trade us lop dollar paid Built Order Rons Kt stock choose Its s400OO Pipet Tri-Poce Quarter Scale 89 wingspan 42 Sq Ft detailed plans $1699 PR Send $i00 self addressed stamped envelope far detailed list Built-Up R/C Models ond 50% Sale Hobby Capitol 46 N Oak St Ventura CA 93001 Phone 805 643-7616 / 642-8465 efforts promote models look fly like full-size counterparts may finally blossom ing full bloom Las Vegas TOC thing andthe IMAC organization promoting aerobatic models have copies full scale machines CAP addition pack hopefully add pleasure others just did Glen Hazel Sig gang up Iowa doing share promote IMAC philosophy decide build CAP sashay up next year enjoy bash put benefit us modelers RC Aerobatics/Van Putte continued page 26 street front house said technique faultless beginning Eleck Rider performed perfectly Id half truthful cycle did perform perfectly technique left lot desired initially poor driving ability its advant ages Whenever lost control cycle spun out ran curb dashed under car clobbered mailbox post demonstrated durability system After two weeks hard use 13 novice drivers cycle has scuff marks acetate fairing evidence its hard life its tough first questions someone has never seen perform asks difficult keep upright answer very simple Its easy Unless driver does something upset cycle will happily drive forever straight line want turn thats different story Eleck Rider requires coordination ofthrottle steering negotiate turn tighter turn coordination required Steering accomplished turning front forlc done tilting fork front wheeVfork castered free turn direction So does cycle steer Very nicely thank extremely stable too have hit number obstructions include rocks manhole cover cracks pavement acorns jumping ramp etc very few exceptions cycle has stabilized itself motored electric motor operated servodriven rheostat throttle stick has spring return center Forward movement stick provides proportional forward speed Pulling back stick causes motor function like generator acts brake dead man throttle feature nice beginners since cycle will stop itself let go stick best place leam operate Eleck Rider large smooth area like parking lot Once driving proficiency achieved large area smaller places can tried out cycle started holding upright advancing throttle holding stable briefly acceler ates Initial operation should about R3 throttle gentle tums should attempted Sharper turns must accomplished throttling back turning cycle throttling up about halfway through turn slower cycle sharper turn can cycle will fall over gets too slow key success proper coordination throttle takes proficient RC pilot less half hour learn operate Eleck Rider Part problem RC newcomers will have deciding way move stick cycle heading toward An experienced pilot has advantage area because has already learned control airplane coming toward him Unfortunately old rule stick toward low wing doesnt help much motorcycle Am enjoying Eleck Rider Well weekday huny home work drive 30 minutes before gets dark weekends tough get chores done before taking out So far havent able racing others because first kid block have However several others way will probably racing around water-filled milk jugs local parking lot read Get case youve wondering next Pattern Problem Month will appear answer ts receive someone response request problems has very underwhelming Ron Von Puttg 12 Connie Drive Slzalimart FL 32579 Spin Tunnel Robelen continued page 24 good brands really am stuck Hot Stuff type glue truly superior Very light weight will never warp thinnest tail surface course dries immediately other brands Zap Jet etc areallfine Imsure Ijusthavenothadmuch experience Various finish techniques useful Sometimes apply coat sanding sealer Testors Hot Fuel Proof trim color am also pleased results using spray dyes use Deep-flex brand spray can found local variety store usual method construction start fuselage lightly tack glue two blocks together part vertical centerline first shape top view side view followed careful shaping 96 Model Aviation MAMMOTH SCALERS nce have available reeglete line enganeasmts alal eufflers enat 90 So 15 engines srsis OIaDRA WEBRA ar etc Wgite call far catalog emS price info Quarter Headquarters U 12321 5am raulmCaS4iI2 334,, contours After shaping pop blocks apart hollow out inside gouge blades nose area may left solidz however tail aft wing must quite light wing shaped suitable thickness balsa sheetfirst cutting planform forming airfoil finally setting dihedral place wings usually mounted cutting away appropriate area fuselage glueing wing place fairing necessary tail surfaces must very light therefore attempt form airfoil shapes etc Rather sand piece sheet balsa quite thin 0 10inch cut tail pieces fastened place tiny drops Hot Stuff finish may now applied after model ready balancing addition al ballasting scale weight etc As rule have able set control surfaces models moistening lightly bending have yet found need hinging controls nor could have built models good starting point controls set elevator up rudder spin direction ailerons against spinfor example up elevator left rudder right aileron aid launching made small paddle dowel handle wire rim fine mesh fabric center model placed nose facing launcher held open trap-door launching using finger same hand hold trap-door open model launched gently flicking wing tip finger other hand both starts model spinning propels tunnel throat trap-door allowed fall shut tunnel rpm adjusted balance spinning model Take word it whole lot easier show try describe old expression practice makes perfect really applies things happen pretty quickly As much research things always simple appear case am referring specific phenomena encounter ed tiny models cases models would maintain spin given set conditions though certain should looking answers already assuming lack agreement due Reynolds Number some other scaling effect Disturbing was still pleased overall effect models would spin smoothly fine demonstrations etc Playing hunch evening fastened strip scotch tape wing leading edges problem models form crude flap result dramatic model would spin readily rate spin spin angle-of-attack etc quite close what expected Fine tuning trimming tape produced flap about one-half wingspan one-tenth chord tape flaps place almost models will spin expected considering general lack knowledge prototype behavior effort better understand phenomena constructed small wing mounted force measurement scale another small wind tunnel Runs made tape flaps place As lift curves show lift developed especially higher angles attack such encountered tail spin will try draw lofty conclusions thisjust pass along data As photographs would indicate models patterned after current general aviation lightplanes has both good bad Bad because general lack information about spin behavior full scale aircraft prevents direct comparisons However category airplanes has areas March 1 980 97 Al Superiority HOT STUFE FOR THE MODELER WHO MUST HAVE MAXIMUM STRENGTH DEEP PENETRATION LIGHTEST WEIGHT VERSATILITY UNCOMPROMISING QUALITY INSTANTLY TIP BOOKLETS FREE ATOR YOUR HOBBY DEALER SEND SELF ADDRESSED STAMPED ENVELOPE TO iiGtfldO PROPELLERS Made polyester boil color Go GRISH propeller True helical pitch airfoil win-power Sizes pitches styles needs AT YOUR DEALER 2 Blade Tractor 5-3each 545354USc 63645Cc 747678Sc 8486887Cc 949-697 9810410-6Sc 11411-6118 *1 12412612-6815 2 Blade Pusher 5b3 5-4 6-36-4 Nc 8-6 Sc 9-610-681 3 Blade Tractor 53 6-364Nc 3 Blade Pusher 63Nc Metallic- Color Tractor 7678*1 8688*13 96 061041N Pusher06*15 design sensitivity small changes make dramatic differences tailspin behavior sensitive areas include wing airfoils wing location high wing low wing tail design fuselage contours especially behind wing control surface deflections C G location mass distri bution etc no perfect size spin models started models about two-in wingspan very convenient launching ease staying away tunnel walls recently have begun build larger models three-in wingspan have advantages easier construction possible interchangeable parts well being likely meet ballpark inertia requirements main drawback relates launching tunnel larger models tend strike walls easily sensitive design areas especially tailspin motions decided design own general aviation research modeL model theDBR-2 Special includes blend GRISH LARGE WOOD PROPELLERS HARDWOOD too hard minimizes chance costly plane engine damage True pitch airfoil fully finished balanced ready coating 3/8 BOREALL SIZES IN18 57 6 8 & 10 PITCH 20 8 22 10 24 13 RIGHT HAND TRACTOR BROS GRUSH ST JOHN INDIANA 46373 shapes found modern full-scale designs As drawn model portrays force set-up will tend have flat no-recovery spin mode may changed altering areas modeL have made several tail assemblies T-tail etc alone make dramatic differ ences spin behavior using basic model changing just piece time possible analyze results proposed design changes introducing too variables once also very interesting build actual scale models familiar airplanes Please very cautious about drawing conclusions live era product liability lawsuits simply amazing would want ever take chance falsely accusing brand airplane usual obstacle building scale models still applies namely lack information scrounging around have found several sources very helpful Jones Pocket Book Series great reference source some company brochures also excellent three-view drawings published various magazines Mass data typically hard find probably will require cross-referencing Generally published drawings larger desired larger cities will hae some photocopy machine capable making copies reduced size very 100 Model Aviation ALWAYS AVAILABLE AT YOUR HOBBY DEALER Satellite City PO Box 836 Simi CA 93065 805 522-0062 1 / 3 NEW SIZE IN 8 & 10 PITCH 26 $16 MINIATURE SPIN TUNNEL Model Test comparisons Models Approx 2 Wingspan ModelTunnel RPMSpin RateSpin AOA R PSDegrees Yankee #4 Tail410 0 85 Yankee #6 Tail610 50 ankee V Tail530 50 55 Yankee r Tail510 0 55 Sundowner520 30 35 PSU-1380 0- 75 BD-55580 5-80 BDSL480 5-80 F4U corsair580 5 50 cessnalso610 25-30 Piper Twin420 5 70 Variviggen520 30- 35 Zonker480Oscillatory VariezeNO SPIN handy shrinking job Photographic techniques would fine available use handy pocket calculator reduce dimensions draw plan grid paper As rule small detail may safely omitted antenna door latches etc changing results According tests NASA spin tunnel landing gear does affect model spin behavior measurable way reason leave delicate parts off models always refinements possible type project method measuring air velocity would real asset would method easily measuring spin rate models have experimented strobe light Seemingly no end variations possible project sort will always looking opportunities improve equipment techniques involved Maybe some day can find RC system tiny enough fit models could observe recovery behavior also Todays dream to-1 morrows project has theme through effort anyone would like correspond will try answer mail especially selfaddressed stamped envelope Happy spinning REFERENCES I Janet Pocket Book Series such Light Aircraft etc 2 Burt S M. Jr Bowman J S. Jr white E L SpinTunnel Investigation Spinning Characteristics Typical Single-Engine General Aviation Airplane Designs NASA Technical Paper 1009 September 1977 3 Beechcraft Today company hrochnre 4 Powers Bradford Ahout Size Model riarian January 1978 5 Powers Bradford Lets Talk About Reynolds Numbers Model Aviation February 1979 RC Pylon/Hager continued page 27 100% profit ideas get members wife bake cookies cupcakes brownies items sell very well 100% profit Always buy large size jars catsup mustard relish creamer sugar coffee Buy cups case What isnt used can saved another contest Dont sell items too high price want make profit dont overdo club can make several hundred dollars just well-run concession stand good example well-planned race annual Fort Wayne Flying Circuits Pylon Races run Jim Gager Jim club spend lot time before race day promoting As non-profit club can usually get free publicity local radio stations television helps promote sport gets public out see racing people also spend money club also gives out several hundred dollars prize money seems working year turn-out up 79 contest 28 entries Formula 36 entries Quarter Midget results Formula 11 Jim Moorehead 2 Bob Reuther 3 Dave Keats 4 Bill Johnason 5 Bob Onori 6 William Preis 7 Wayne Yeager 8 Eric Meyers 9 Al Grove 10 Art Arro Quarter Midget 1 Doug Bebensee 2 Duane Gall 3 Gail Jacobson 4 Dennis Sumner 5 Brian Richmond 6 Floyd Fitzgerald 7 Ken Heatlie 8 John Kilsdonk 9 Dave Timcoe 10 Allen Booth Any might have some ideas tips running successful race send will pass Bill Hager 4622 Bridgeport Dr Garland TX 75043 Inexpensive key word ACES new line R/C kits called Silver Series line offers unique combination value wide range versatility found todays R/C market until now cutting out biggeal costs Labor furnish kit furnish labor allows us give top-quality product inexpensive price comparable $800 radios its featuren * SERVO REVERSAL SWITCHES--With ists flip aft switch terso travel direcriae etch four psievasy channets rue reversed INDEPENDENT THROW ADJUST-On chavuels amount servo travel can cos stalled independeerty * EtETH CHANNEL ADItJST--Seeno position whea retract switch either le Up Down posirice ledepeedeutly adiastabte * TRtM LOCATtON rARtABLES-flee marion af trims us builders discrerivo cue have standard trim crossed trim cemhiaatioe two TRtM AUTI-IORITY PROORAMMABILITYBy ebasgiag plug-in lived resistors amouas remo esoursios whes tIre trims mooed programmable * DUAL RATE--Switches aed adiusemeet pats famished provide DUAL RATE up three channels EXPONENTIAL RATE OPTtONThis ptughs option provides ean-liarar servo teasel se klatioe snob movement up three vhannels 5t795 ELECTRONIC MIXER OPEIONWith plug-in modate two functices cue N k-i together tither onidirectiaerlly arhidireosioeally lSlt95 * PROGRAMMABLE PUSH BUTTON OPTION-te-tight adiustable peepeogeammed covasot surface muermena may obtained push g h $89 THE SILVER SEVEN $28495 Full ni cd system kit receiver four servos two classics Flyline Farman Moustique SEE YOUR LOCAL HOBBY DEALER send 25c catalog 34 span 020 power $1595 QUAKER FLASH single Channel nC Power free flight Y9 Wtngspan FLYLINE MODELS INC aaaa DORR AVENUE lB FAIRFAX VtAGINIA aunas 17031 5732t38 March 1980 101 Cheek wish Ane dealer metre naIl nomptate datailt crws S complete Catalogs $100 lasid $BOfo CaunMa urnl Box 511E 119W 19th. Higginsville Mo 64037 816 584-7121 COMING SOON 117e READY NOW
Edition: Model Aviation - 1980/03
Page Numbers: 20, 21, 22, 23, 24, 96, 97, 98, 99
both magazine state R IUJNN L art pleased present uniqu report As will see author brought work home him TAILSPIN Flat spin other performed deliberate tailspins some time during very rapidly nose-high attitude Generally related terms phrases associated sport fun flying session Occasionally attempts recover useless model important hut little understood area airplane spin begunusually anew design non- crashes Rare unusual No Mysterious flight Most us fly RC models have standard styling model will begin rotate Yes Lest modelers feel lonely designers About release model 2-in span PSU-1 0~rvihg spin test operation tinyPenn State University Dave prepares flickDave retrieves PSU-1 through hatch model plainly seen through windowleft wing tiptunnel bottom certainly tiny 20 Model Aviation full-scale aircraft occasionally experience same dilemma Perhaps can imagine results study research aircraft tailspins has subject much energetic effort research teams ofthe valuable facilities research type spin tunnel concept involves wind tunnel standing vertically air being drawn upward fan mounted top Models launched whirling motion like frisbee rising air within spin tunnel fan rpm adjusted just balance descent rate model being tested result opportunity closely study motion behavior model Research facilities nature quite rare being two free world NASA has Langley Field Virginia other located France NASA spin tunnel measures twenty feet across test chamber usual model size about two feet wingspan models equipped RC operate controls thus making possible study recovery behavior work NASA-Langley am often exposed spin-tunnel tests have become quite fascinated very safe method testing critical motions model airplanes Lacking priority compete testing time ADJUST GAP TO CALIBRATE RELAY COIL C7j37ORTH MAGNET 3N DIA1/8 THICK WOOD OR PLASTIC6O NI1N34A 0 PM 0 aN magnetic tachometer made Radio Shack parts Magnets glued plastic disk glued fan assembly Relay coil mounted wood cross member position coil tweaked achieve desired output meter C B H9 10 rH B25 RADIUS INSIDE 3 fA TUNNEL CROSS SECTIONS ALL DIMENSIONS ARE INSIDE tunnel made cardboard Plexiglass windows hinged strapping tape Masking tape liberally used hold things together along Titebond glue II 3 lur lower area rapidly spinning Beechcraft 33 right-turn spin RELAY COIL 8KfL vi IOmF c-c I5 F 15BB // AA / rirai evaion moaels aii Z- Span lop Bottom Bede BD5-J Cessna 150 Piper Arapahoe Penn State PS U-i 30 05 3M I--5 i ASIC WINC WFH urn / V /1/ / ESi VELOCITY 20 0 30 40 graph shows effect leading edge flaps wing lift Full-size airfoil top right NASA spin tunnel began wonder about constructing very own having budget federal agency began realize spin tunnel would have just bit smaller perhaps little less elegant search house shop tumed up floor fan 20-inch diameter blades variable transformer controlled just fine Finding contours wind tunnels small sizes rather tricky business chose cardboard structural material avail able wherever grocery stores found easily modified miniature spin tunnel scale model larger unit specific design tailored job intended detailed construction article therefore will speak general terms omit detailed construction information spin tunnel fashioned cardboard has Plexiglass viewing windows used jigsaw cut launching hatch window hinged strapping tape Masking tape used jiberally hold things together along Titebond glue Strips wood support fan unit top well providing bottom frame legs flow-straightener grid bottom too may cardboard silk-like polyester fabric net stretched across grid serves two purposes smooth airflow catch models bottom rather large hatch cut bottom cone purpose retrieving 22 Model Aviation 8 6 CL / f. / oz U UlO rz z 0 C I1 0 0 I1 IThe launch padd9e Model placed nose facing launcher held theopentrapdoor launching using finger same hand hold open door Tools used making miniscule planes scales Iauncn paddle Models Mooney M2OC left four 2- span Yankees variety tail configurations EAA biplane 0-1 gram scale6-in machiniaL rule ulCyluUllu models desk lamp borrowed son s room used light jAterior painted interior flat black could see models spray-painted outside silver aerosol canlooks better assorted grocery cartons tachometer shown constructed parts purchased local Radio Shack store See sketch schematic details magnets glued plastic disk glued fan assembly mounted relay coil wooden cross-member tweaked position coil achieve desired output meter As spin tunnel began taking shape became obvious size models would quite small experience industrial test models aware need properly scale weight balance inertias dimensions spin test models measure values another matter have found six-inch long machinists ruler best friend measur ing tiny model dimensions can bought graduations / 100-inch found wherever machinist tools sold Try Sears Roebuck Measuring weight another problemi General ly complete model will weigh between one-tenth N I IIII liii I I Ifer 800 600 1 0 20C 0 j K MINIATURE SPIN TUNNEL MAXIMUM OUTPUT 21FPS AT 980 RPM inL --II 12 16 VELOCITY RPS graph provides values air velocity ft/sec read against rpm fan gram gram depending model scale prototype weight solution construct scales job simple spring wire scale shown handy weighing parts quickly during construction exotic beam scale super weighing complete models Check drawings specific details scale custom job Construction follows same theme specific variations noted Generally used Hot Stuff type glue throughout bonding 20 halta wood structure beam scale pivots two strips copper wire resting new razor blade no nicks please Calibration tiny scales accomplish ed follows length 1/32-in wire solder trimmed until weighed exactly gramlocal druggist piece measured length recorded Short pieces solder cut length one-tenth long 1/100 full length gave calibration weights Balance Notes 1 balsa 2 Assemble Hot Stuff 3 Two slide weights ten times weight other 4 Lead counterweight just balances 5 Maximum range determined slide-weights Dave sets balance 1 gram pan both maximum travel Again reduce size drawing Bottom piece plus 3/16 sq right measures B inches 1/32 PAN I/16X 1/16 / STOP PINS 0 3116x 3/16 3/16X 3/40 V March 1980 23 0 Three 2-in canards top bottom Zonker Rutan Variviggen Rutan VariEze COUNTER WEIGHTSLIDE WEIGHTS -TWO WIRE BEARINGS DBR-2 Special hypothetical full-scale prototype Span 25 ft area 104 sq ft. weight 1500 lbs Model 1/100th scale Span 3 in. area 15 sq weight 68 grams CG 25% chord As shown model should have flat no-recovery spin mode moving stab higher T-tail interesting effect would immediately noticed .-i ri-rn PANJ} 1132 H 1/32 X 3/16 x 112 ALL WOCO IS BALSA I/ l14X 3/4e BASE WIRE WITHOUT PAN 3/l6aX 3/16 gram one-tenth gram 1/100 gram used calibrating marks various scale bars Checking balance tiny models also requires special set-up None old fingertip under wingtips use 020-in music wire length wire passing through fuselage desired balance location Two lengths wire glued strip wood model suspended across handiest material ballast thin lead cut small slivers pointed shapes push nose needed trimming lead until model hangs level balance wires aircraft spinning moments inertia about various axis have major influence spin behavior value have developed proper technique measur ing would appreciate suggestions present method construct models simulate empty weight prototype airplane add weight center model until matches scale gross weight prototype Additionally distribution mass prototype must considered since twinengine design tip tanks will very different single-engine planes respect Construction dwarf scale models much less difficult first appearances Real ly patient reader will share some techniques hope shedding some light matter tools expensive exotic yet has purpose Tweezers nearly essential really sharp knife prefer Uber Skiver No 11 blade however really sharp X-Acto will job too Good sharp single-edge razor blades always handy especially broken special shapes pliers hollow out fuselages models X-Acto gouges great usual sanding blocks out question use sandpaper glued onto coffee stirring sticks can made up shapes different sandpaper grits six-in ruler just right measurements magnifying glass real asset Any other tools equipment found under miscellaneous pins razor saw etc Balsa wood favorite material far just has lightest easiest working material available tiny models require little sheet seems last forever am real choosy wood selecting clear-grained unwarped extremely light stock favorite Sig Contest Balsa although plenty Continued page 96 Scale calibrated short lengths wire solder Ex 125 1/32 solder equals 1 gram 125 equals 01 gram could show drawing full-size prepared author dimensions base piece rear upright both 4 inches 24 Model Aviation Beechcraft Sundowner 0-25 gram springwire scales Dave dreams someday finding RC system fit little aircraftJ DRAWN FULL SIZE QL ii L OPTIONAL TAPE FLAPS QHARP A-A CORNER 3FA -LA II 0 5 dii SPORT AEROBATICS Ron Van Putte COUPLE months ago 1 mentioned instructor problem some clubs have tunately club has excellent instruction program beginners largely due enthusiasm club instructors feature program other clubs might like copy awarding solo certificates novice pilot instructor club meeting Blank certificates printed up club president Ed Moorman AMA DistrictS AVP North Florida Ed types appropriate information about novice pilot gives completed certificate instructor presentation Both novice pilots instructors like idea club might like try too Good instructors leave helpful hints students reading club newsletters ModelAviations publisher Carl Wheeley sends came across great article Ed Cocciola Cedar Rapids low Skyhawks newsletter Logbook good advice contained Eds article bears repeating printing slightly edited version Notes Novices Since 1973 have seen lot Skyhawks pass through club Some made quite contribution own way talking about couple dont mean slight ofthose dont mention also made contribution said have reason bringing up particular ones wanting solo summer still needed someone take off after wandering around sky fur 10 15 minutes Id yell someone land Sound familiar bet doing since summer before day plane starting spin trying figure out should giving left turn right turn Bill Birkey grabbed trans mitter straightened Out regained lost altitude still wasnt flying less three mistakes high done count less times before Jim Clark once grabbed transmitter pulled Falcon 56 out spin about four feet off deck day stood watching crash However Bill Birkey did something different stuck handed back transmitter day said shes coming Ed watch low wing straighten up just push stick low wing Now isnt simple time trying mentally sort out plane coming turning toward right really planes left means have push stick? Oh hell has crashed now anyway quick easy just push toward low wing need know left right Maybe thats problem Right quit getting much trouble began really enjoying flying wasnt getting closer making landings day later summer George Moger came over asked flying plane flying up doing usual aimless wandering routine did know what meant explained wasnt leading airplane just following around keep ing range wasnt trying anything keep crashing plane went wanted within radio range George said want solo have start making plane go directly point another fly predetermined route wandering chang ing course have accomplish order able set up landing approach course stay landing simply matter flying approach pattern lower lower until finally can just cut throttle let settle runway Well next few weeks flying pattern constantly remember first time came down runway 15 feet air thought skimming deck George usually would still yell him someone land thought fuel getting low day yelled George entered base leg said Cut throttle As did turned hand him transmitter walking away yelled just said Land kept walking Falcon rolled stop still its wheels piece happiest guy Linn County George Bill club now other guys around can much George Bill Jim others did Just give chance Happy landings Thanks Ed beginners can put selves article benefit Maybe epitaph some airplanes can postponed Speaking epitaphs John Thomas editor West Orange Sunfliers Orlando FL newsletter Sun beam published following RIP lies airplane red blue white turned left should have turned right last two weeks have enjoying new exciting phase radio control modeling purchased Kraft Eleck Rider motorcycle KP-2A radio systern After about three hours assembly cycle operating Continued page 96 26 Model Aviation Van Putte Mustang sports license plate 10 conTests aii over oeep uuth Ron says honk wave see car give him call CB airplanes may get crack two out coupie 01 keep going Celastic patches decorated Magic Marker ld Roberts ship looks luxurious nocing ne put iii painted interior adhesive sprinkled flocking Purchasing R/C Aircraft easy YOUNIQUE AT Hobby Capital keep large ready supply af Custom-Bilt RC Aircraft Kits Engines RC Units times And. thanks ta years af experience dealing people sections af US. prepare special ane-of-a-kind RC Aircraft far special one-ofa-kind RC Flyer wha demands unique laok express tastes Chances youll find custom paint finish exquisite detailed cockpit interiors glassed engine compartments real scale wheels custom grilled nose section will knock socks offi. youll probably never see another like cause Hobby Capitol expert stressed preparation goes far beyond standard checkout RC shoppers turning up increasing numbers convenient showroom because word out. outstanding buys service finest selection unique RC Aircraft anywhere its HOBBY CAPITOL Old Ignition Trode4n Buy sell old time ignition engines Box up what have send us honest appraisal could worth new proportional set have engines can also start collection welcome built-up airplanes used proportionals old time ignition engines Come trade us lop dollar paid Built Order Rons Kt stock choose Its s400OO Pipet Tri-Poce Quarter Scale 89 wingspan 42 Sq Ft detailed plans $1699 PR Send $i00 self addressed stamped envelope far detailed list Built-Up R/C Models ond 50% Sale Hobby Capitol 46 N Oak St Ventura CA 93001 Phone 805 643-7616 / 642-8465 efforts promote models look fly like full-size counterparts may finally blossom ing full bloom Las Vegas TOC thing andthe IMAC organization promoting aerobatic models have copies full scale machines CAP addition pack hopefully add pleasure others just did Glen Hazel Sig gang up Iowa doing share promote IMAC philosophy decide build CAP sashay up next year enjoy bash put benefit us modelers RC Aerobatics/Van Putte continued page 26 street front house said technique faultless beginning Eleck Rider performed perfectly Id half truthful cycle did perform perfectly technique left lot desired initially poor driving ability its advant ages Whenever lost control cycle spun out ran curb dashed under car clobbered mailbox post demonstrated durability system After two weeks hard use 13 novice drivers cycle has scuff marks acetate fairing evidence its hard life its tough first questions someone has never seen perform asks difficult keep upright answer very simple Its easy Unless driver does something upset cycle will happily drive forever straight line want turn thats different story Eleck Rider requires coordination ofthrottle steering negotiate turn tighter turn coordination required Steering accomplished turning front forlc done tilting fork front wheeVfork castered free turn direction So does cycle steer Very nicely thank extremely stable too have hit number obstructions include rocks manhole cover cracks pavement acorns jumping ramp etc very few exceptions cycle has stabilized itself motored electric motor operated servodriven rheostat throttle stick has spring return center Forward movement stick provides proportional forward speed Pulling back stick causes motor function like generator acts brake dead man throttle feature nice beginners since cycle will stop itself let go stick best place leam operate Eleck Rider large smooth area like parking lot Once driving proficiency achieved large area smaller places can tried out cycle started holding upright advancing throttle holding stable briefly acceler ates Initial operation should about R3 throttle gentle tums should attempted Sharper turns must accomplished throttling back turning cycle throttling up about halfway through turn slower cycle sharper turn can cycle will fall over gets too slow key success proper coordination throttle takes proficient RC pilot less half hour learn operate Eleck Rider Part problem RC newcomers will have deciding way move stick cycle heading toward An experienced pilot has advantage area because has already learned control airplane coming toward him Unfortunately old rule stick toward low wing doesnt help much motorcycle Am enjoying Eleck Rider Well weekday huny home work drive 30 minutes before gets dark weekends tough get chores done before taking out So far havent able racing others because first kid block have However several others way will probably racing around water-filled milk jugs local parking lot read Get case youve wondering next Pattern Problem Month will appear answer ts receive someone response request problems has very underwhelming Ron Von Puttg 12 Connie Drive Slzalimart FL 32579 Spin Tunnel Robelen continued page 24 good brands really am stuck Hot Stuff type glue truly superior Very light weight will never warp thinnest tail surface course dries immediately other brands Zap Jet etc areallfine Imsure Ijusthavenothadmuch experience Various finish techniques useful Sometimes apply coat sanding sealer Testors Hot Fuel Proof trim color am also pleased results using spray dyes use Deep-flex brand spray can found local variety store usual method construction start fuselage lightly tack glue two blocks together part vertical centerline first shape top view side view followed careful shaping 96 Model Aviation MAMMOTH SCALERS nce have available reeglete line enganeasmts alal eufflers enat 90 So 15 engines srsis OIaDRA WEBRA ar etc Wgite call far catalog emS price info Quarter Headquarters U 12321 5am raulmCaS4iI2 334,, contours After shaping pop blocks apart hollow out inside gouge blades nose area may left solidz however tail aft wing must quite light wing shaped suitable thickness balsa sheetfirst cutting planform forming airfoil finally setting dihedral place wings usually mounted cutting away appropriate area fuselage glueing wing place fairing necessary tail surfaces must very light therefore attempt form airfoil shapes etc Rather sand piece sheet balsa quite thin 0 10inch cut tail pieces fastened place tiny drops Hot Stuff finish may now applied after model ready balancing addition al ballasting scale weight etc As rule have able set control surfaces models moistening lightly bending have yet found need hinging controls nor could have built models good starting point controls set elevator up rudder spin direction ailerons against spinfor example up elevator left rudder right aileron aid launching made small paddle dowel handle wire rim fine mesh fabric center model placed nose facing launcher held open trap-door launching using finger same hand hold trap-door open model launched gently flicking wing tip finger other hand both starts model spinning propels tunnel throat trap-door allowed fall shut tunnel rpm adjusted balance spinning model Take word it whole lot easier show try describe old expression practice makes perfect really applies things happen pretty quickly As much research things always simple appear case am referring specific phenomena encounter ed tiny models cases models would maintain spin given set conditions though certain should looking answers already assuming lack agreement due Reynolds Number some other scaling effect Disturbing was still pleased overall effect models would spin smoothly fine demonstrations etc Playing hunch evening fastened strip scotch tape wing leading edges problem models form crude flap result dramatic model would spin readily rate spin spin angle-of-attack etc quite close what expected Fine tuning trimming tape produced flap about one-half wingspan one-tenth chord tape flaps place almost models will spin expected considering general lack knowledge prototype behavior effort better understand phenomena constructed small wing mounted force measurement scale another small wind tunnel Runs made tape flaps place As lift curves show lift developed especially higher angles attack such encountered tail spin will try draw lofty conclusions thisjust pass along data As photographs would indicate models patterned after current general aviation lightplanes has both good bad Bad because general lack information about spin behavior full scale aircraft prevents direct comparisons However category airplanes has areas March 1 980 97 Al Superiority HOT STUFE FOR THE MODELER WHO MUST HAVE MAXIMUM STRENGTH DEEP PENETRATION LIGHTEST WEIGHT VERSATILITY UNCOMPROMISING QUALITY INSTANTLY TIP BOOKLETS FREE ATOR YOUR HOBBY DEALER SEND SELF ADDRESSED STAMPED ENVELOPE TO iiGtfldO PROPELLERS Made polyester boil color Go GRISH propeller True helical pitch airfoil win-power Sizes pitches styles needs AT YOUR DEALER 2 Blade Tractor 5-3each 545354USc 63645Cc 747678Sc 8486887Cc 949-697 9810410-6Sc 11411-6118 *1 12412612-6815 2 Blade Pusher 5b3 5-4 6-36-4 Nc 8-6 Sc 9-610-681 3 Blade Tractor 53 6-364Nc 3 Blade Pusher 63Nc Metallic- Color Tractor 7678*1 8688*13 96 061041N Pusher06*15 design sensitivity small changes make dramatic differences tailspin behavior sensitive areas include wing airfoils wing location high wing low wing tail design fuselage contours especially behind wing control surface deflections C G location mass distri bution etc no perfect size spin models started models about two-in wingspan very convenient launching ease staying away tunnel walls recently have begun build larger models three-in wingspan have advantages easier construction possible interchangeable parts well being likely meet ballpark inertia requirements main drawback relates launching tunnel larger models tend strike walls easily sensitive design areas especially tailspin motions decided design own general aviation research modeL model theDBR-2 Special includes blend GRISH LARGE WOOD PROPELLERS HARDWOOD too hard minimizes chance costly plane engine damage True pitch airfoil fully finished balanced ready coating 3/8 BOREALL SIZES IN18 57 6 8 & 10 PITCH 20 8 22 10 24 13 RIGHT HAND TRACTOR BROS GRUSH ST JOHN INDIANA 46373 shapes found modern full-scale designs As drawn model portrays force set-up will tend have flat no-recovery spin mode may changed altering areas modeL have made several tail assemblies T-tail etc alone make dramatic differ ences spin behavior using basic model changing just piece time possible analyze results proposed design changes introducing too variables once also very interesting build actual scale models familiar airplanes Please very cautious about drawing conclusions live era product liability lawsuits simply amazing would want ever take chance falsely accusing brand airplane usual obstacle building scale models still applies namely lack information scrounging around have found several sources very helpful Jones Pocket Book Series great reference source some company brochures also excellent three-view drawings published various magazines Mass data typically hard find probably will require cross-referencing Generally published drawings larger desired larger cities will hae some photocopy machine capable making copies reduced size very 100 Model Aviation ALWAYS AVAILABLE AT YOUR HOBBY DEALER Satellite City PO Box 836 Simi CA 93065 805 522-0062 1 / 3 NEW SIZE IN 8 & 10 PITCH 26 $16 MINIATURE SPIN TUNNEL Model Test comparisons Models Approx 2 Wingspan ModelTunnel RPMSpin RateSpin AOA R PSDegrees Yankee #4 Tail410 0 85 Yankee #6 Tail610 50 ankee V Tail530 50 55 Yankee r Tail510 0 55 Sundowner520 30 35 PSU-1380 0- 75 BD-55580 5-80 BDSL480 5-80 F4U corsair580 5 50 cessnalso610 25-30 Piper Twin420 5 70 Variviggen520 30- 35 Zonker480Oscillatory VariezeNO SPIN handy shrinking job Photographic techniques would fine available use handy pocket calculator reduce dimensions draw plan grid paper As rule small detail may safely omitted antenna door latches etc changing results According tests NASA spin tunnel landing gear does affect model spin behavior measurable way reason leave delicate parts off models always refinements possible type project method measuring air velocity would real asset would method easily measuring spin rate models have experimented strobe light Seemingly no end variations possible project sort will always looking opportunities improve equipment techniques involved Maybe some day can find RC system tiny enough fit models could observe recovery behavior also Todays dream to-1 morrows project has theme through effort anyone would like correspond will try answer mail especially selfaddressed stamped envelope Happy spinning REFERENCES I Janet Pocket Book Series such Light Aircraft etc 2 Burt S M. Jr Bowman J S. Jr white E L SpinTunnel Investigation Spinning Characteristics Typical Single-Engine General Aviation Airplane Designs NASA Technical Paper 1009 September 1977 3 Beechcraft Today company hrochnre 4 Powers Bradford Ahout Size Model riarian January 1978 5 Powers Bradford Lets Talk About Reynolds Numbers Model Aviation February 1979 RC Pylon/Hager continued page 27 100% profit ideas get members wife bake cookies cupcakes brownies items sell very well 100% profit Always buy large size jars catsup mustard relish creamer sugar coffee Buy cups case What isnt used can saved another contest Dont sell items too high price want make profit dont overdo club can make several hundred dollars just well-run concession stand good example well-planned race annual Fort Wayne Flying Circuits Pylon Races run Jim Gager Jim club spend lot time before race day promoting As non-profit club can usually get free publicity local radio stations television helps promote sport gets public out see racing people also spend money club also gives out several hundred dollars prize money seems working year turn-out up 79 contest 28 entries Formula 36 entries Quarter Midget results Formula 11 Jim Moorehead 2 Bob Reuther 3 Dave Keats 4 Bill Johnason 5 Bob Onori 6 William Preis 7 Wayne Yeager 8 Eric Meyers 9 Al Grove 10 Art Arro Quarter Midget 1 Doug Bebensee 2 Duane Gall 3 Gail Jacobson 4 Dennis Sumner 5 Brian Richmond 6 Floyd Fitzgerald 7 Ken Heatlie 8 John Kilsdonk 9 Dave Timcoe 10 Allen Booth Any might have some ideas tips running successful race send will pass Bill Hager 4622 Bridgeport Dr Garland TX 75043 Inexpensive key word ACES new line R/C kits called Silver Series line offers unique combination value wide range versatility found todays R/C market until now cutting out biggeal costs Labor furnish kit furnish labor allows us give top-quality product inexpensive price comparable $800 radios its featuren * SERVO REVERSAL SWITCHES--With ists flip aft switch terso travel direcriae etch four psievasy channets rue reversed INDEPENDENT THROW ADJUST-On chavuels amount servo travel can cos stalled independeerty * EtETH CHANNEL ADItJST--Seeno position whea retract switch either le Up Down posirice ledepeedeutly adiastabte * TRtM LOCATtON rARtABLES-flee marion af trims us builders discrerivo cue have standard trim crossed trim cemhiaatioe two TRtM AUTI-IORITY PROORAMMABILITYBy ebasgiag plug-in lived resistors amouas remo esoursios whes tIre trims mooed programmable * DUAL RATE--Switches aed adiusemeet pats famished provide DUAL RATE up three channels EXPONENTIAL RATE OPTtONThis ptughs option provides ean-liarar servo teasel se klatioe snob movement up three vhannels 5t795 ELECTRONIC MIXER OPEIONWith plug-in modate two functices cue N k-i together tither onidirectiaerlly arhidireosioeally lSlt95 * PROGRAMMABLE PUSH BUTTON OPTION-te-tight adiustable peepeogeammed covasot surface muermena may obtained push g h $89 THE SILVER SEVEN $28495 Full ni cd system kit receiver four servos two classics Flyline Farman Moustique SEE YOUR LOCAL HOBBY DEALER send 25c catalog 34 span 020 power $1595 QUAKER FLASH single Channel nC Power free flight Y9 Wtngspan FLYLINE MODELS INC aaaa DORR AVENUE lB FAIRFAX VtAGINIA aunas 17031 5732t38 March 1980 101 Cheek wish Ane dealer metre naIl nomptate datailt crws S complete Catalogs $100 lasid $BOfo CaunMa urnl Box 511E 119W 19th. Higginsville Mo 64037 816 584-7121 COMING SOON 117e READY NOW
Edition: Model Aviation - 1980/03
Page Numbers: 20, 21, 22, 23, 24, 96, 97, 98, 99
both magazine state R IUJNN L art pleased present uniqu report As will see author brought work home him TAILSPIN Flat spin other performed deliberate tailspins some time during very rapidly nose-high attitude Generally related terms phrases associated sport fun flying session Occasionally attempts recover useless model important hut little understood area airplane spin begunusually anew design non- crashes Rare unusual No Mysterious flight Most us fly RC models have standard styling model will begin rotate Yes Lest modelers feel lonely designers About release model 2-in span PSU-1 0~rvihg spin test operation tinyPenn State University Dave prepares flickDave retrieves PSU-1 through hatch model plainly seen through windowleft wing tiptunnel bottom certainly tiny 20 Model Aviation full-scale aircraft occasionally experience same dilemma Perhaps can imagine results study research aircraft tailspins has subject much energetic effort research teams ofthe valuable facilities research type spin tunnel concept involves wind tunnel standing vertically air being drawn upward fan mounted top Models launched whirling motion like frisbee rising air within spin tunnel fan rpm adjusted just balance descent rate model being tested result opportunity closely study motion behavior model Research facilities nature quite rare being two free world NASA has Langley Field Virginia other located France NASA spin tunnel measures twenty feet across test chamber usual model size about two feet wingspan models equipped RC operate controls thus making possible study recovery behavior work NASA-Langley am often exposed spin-tunnel tests have become quite fascinated very safe method testing critical motions model airplanes Lacking priority compete testing time ADJUST GAP TO CALIBRATE RELAY COIL C7j37ORTH MAGNET 3N DIA1/8 THICK WOOD OR PLASTIC6O NI1N34A 0 PM 0 aN magnetic tachometer made Radio Shack parts Magnets glued plastic disk glued fan assembly Relay coil mounted wood cross member position coil tweaked achieve desired output meter C B H9 10 rH B25 RADIUS INSIDE 3 fA TUNNEL CROSS SECTIONS ALL DIMENSIONS ARE INSIDE tunnel made cardboard Plexiglass windows hinged strapping tape Masking tape liberally used hold things together along Titebond glue II 3 lur lower area rapidly spinning Beechcraft 33 right-turn spin RELAY COIL 8KfL vi IOmF c-c I5 F 15BB // AA / rirai evaion moaels aii Z- Span lop Bottom Bede BD5-J Cessna 150 Piper Arapahoe Penn State PS U-i 30 05 3M I--5 i ASIC WINC WFH urn / V /1/ / ESi VELOCITY 20 0 30 40 graph shows effect leading edge flaps wing lift Full-size airfoil top right NASA spin tunnel began wonder about constructing very own having budget federal agency began realize spin tunnel would have just bit smaller perhaps little less elegant search house shop tumed up floor fan 20-inch diameter blades variable transformer controlled just fine Finding contours wind tunnels small sizes rather tricky business chose cardboard structural material avail able wherever grocery stores found easily modified miniature spin tunnel scale model larger unit specific design tailored job intended detailed construction article therefore will speak general terms omit detailed construction information spin tunnel fashioned cardboard has Plexiglass viewing windows used jigsaw cut launching hatch window hinged strapping tape Masking tape used jiberally hold things together along Titebond glue Strips wood support fan unit top well providing bottom frame legs flow-straightener grid bottom too may cardboard silk-like polyester fabric net stretched across grid serves two purposes smooth airflow catch models bottom rather large hatch cut bottom cone purpose retrieving 22 Model Aviation 8 6 CL / f. / oz U UlO rz z 0 C I1 0 0 I1 IThe launch padd9e Model placed nose facing launcher held theopentrapdoor launching using finger same hand hold open door Tools used making miniscule planes scales Iauncn paddle Models Mooney M2OC left four 2- span Yankees variety tail configurations EAA biplane 0-1 gram scale6-in machiniaL rule ulCyluUllu models desk lamp borrowed son s room used light jAterior painted interior flat black could see models spray-painted outside silver aerosol canlooks better assorted grocery cartons tachometer shown constructed parts purchased local Radio Shack store See sketch schematic details magnets glued plastic disk glued fan assembly mounted relay coil wooden cross-member tweaked position coil achieve desired output meter As spin tunnel began taking shape became obvious size models would quite small experience industrial test models aware need properly scale weight balance inertias dimensions spin test models measure values another matter have found six-inch long machinists ruler best friend measur ing tiny model dimensions can bought graduations / 100-inch found wherever machinist tools sold Try Sears Roebuck Measuring weight another problemi General ly complete model will weigh between one-tenth N I IIII liii I I Ifer 800 600 1 0 20C 0 j K MINIATURE SPIN TUNNEL MAXIMUM OUTPUT 21FPS AT 980 RPM inL --II 12 16 VELOCITY RPS graph provides values air velocity ft/sec read against rpm fan gram gram depending model scale prototype weight solution construct scales job simple spring wire scale shown handy weighing parts quickly during construction exotic beam scale super weighing complete models Check drawings specific details scale custom job Construction follows same theme specific variations noted Generally used Hot Stuff type glue throughout bonding 20 halta wood structure beam scale pivots two strips copper wire resting new razor blade no nicks please Calibration tiny scales accomplish ed follows length 1/32-in wire solder trimmed until weighed exactly gramlocal druggist piece measured length recorded Short pieces solder cut length one-tenth long 1/100 full length gave calibration weights Balance Notes 1 balsa 2 Assemble Hot Stuff 3 Two slide weights ten times weight other 4 Lead counterweight just balances 5 Maximum range determined slide-weights Dave sets balance 1 gram pan both maximum travel Again reduce size drawing Bottom piece plus 3/16 sq right measures B inches 1/32 PAN I/16X 1/16 / STOP PINS 0 3116x 3/16 3/16X 3/40 V March 1980 23 0 Three 2-in canards top bottom Zonker Rutan Variviggen Rutan VariEze COUNTER WEIGHTSLIDE WEIGHTS -TWO WIRE BEARINGS DBR-2 Special hypothetical full-scale prototype Span 25 ft area 104 sq ft. weight 1500 lbs Model 1/100th scale Span 3 in. area 15 sq weight 68 grams CG 25% chord As shown model should have flat no-recovery spin mode moving stab higher T-tail interesting effect would immediately noticed .-i ri-rn PANJ} 1132 H 1/32 X 3/16 x 112 ALL WOCO IS BALSA I/ l14X 3/4e BASE WIRE WITHOUT PAN 3/l6aX 3/16 gram one-tenth gram 1/100 gram used calibrating marks various scale bars Checking balance tiny models also requires special set-up None old fingertip under wingtips use 020-in music wire length wire passing through fuselage desired balance location Two lengths wire glued strip wood model suspended across handiest material ballast thin lead cut small slivers pointed shapes push nose needed trimming lead until model hangs level balance wires aircraft spinning moments inertia about various axis have major influence spin behavior value have developed proper technique measur ing would appreciate suggestions present method construct models simulate empty weight prototype airplane add weight center model until matches scale gross weight prototype Additionally distribution mass prototype must considered since twinengine design tip tanks will very different single-engine planes respect Construction dwarf scale models much less difficult first appearances Real ly patient reader will share some techniques hope shedding some light matter tools expensive exotic yet has purpose Tweezers nearly essential really sharp knife prefer Uber Skiver No 11 blade however really sharp X-Acto will job too Good sharp single-edge razor blades always handy especially broken special shapes pliers hollow out fuselages models X-Acto gouges great usual sanding blocks out question use sandpaper glued onto coffee stirring sticks can made up shapes different sandpaper grits six-in ruler just right measurements magnifying glass real asset Any other tools equipment found under miscellaneous pins razor saw etc Balsa wood favorite material far just has lightest easiest working material available tiny models require little sheet seems last forever am real choosy wood selecting clear-grained unwarped extremely light stock favorite Sig Contest Balsa although plenty Continued page 96 Scale calibrated short lengths wire solder Ex 125 1/32 solder equals 1 gram 125 equals 01 gram could show drawing full-size prepared author dimensions base piece rear upright both 4 inches 24 Model Aviation Beechcraft Sundowner 0-25 gram springwire scales Dave dreams someday finding RC system fit little aircraftJ DRAWN FULL SIZE QL ii L OPTIONAL TAPE FLAPS QHARP A-A CORNER 3FA -LA II 0 5 dii SPORT AEROBATICS Ron Van Putte COUPLE months ago 1 mentioned instructor problem some clubs have tunately club has excellent instruction program beginners largely due enthusiasm club instructors feature program other clubs might like copy awarding solo certificates novice pilot instructor club meeting Blank certificates printed up club president Ed Moorman AMA DistrictS AVP North Florida Ed types appropriate information about novice pilot gives completed certificate instructor presentation Both novice pilots instructors like idea club might like try too Good instructors leave helpful hints students reading club newsletters ModelAviations publisher Carl Wheeley sends came across great article Ed Cocciola Cedar Rapids low Skyhawks newsletter Logbook good advice contained Eds article bears repeating printing slightly edited version Notes Novices Since 1973 have seen lot Skyhawks pass through club Some made quite contribution own way talking about couple dont mean slight ofthose dont mention also made contribution said have reason bringing up particular ones wanting solo summer still needed someone take off after wandering around sky fur 10 15 minutes Id yell someone land Sound familiar bet doing since summer before day plane starting spin trying figure out should giving left turn right turn Bill Birkey grabbed trans mitter straightened Out regained lost altitude still wasnt flying less three mistakes high done count less times before Jim Clark once grabbed transmitter pulled Falcon 56 out spin about four feet off deck day stood watching crash However Bill Birkey did something different stuck handed back transmitter day said shes coming Ed watch low wing straighten up just push stick low wing Now isnt simple time trying mentally sort out plane coming turning toward right really planes left means have push stick? Oh hell has crashed now anyway quick easy just push toward low wing need know left right Maybe thats problem Right quit getting much trouble began really enjoying flying wasnt getting closer making landings day later summer George Moger came over asked flying plane flying up doing usual aimless wandering routine did know what meant explained wasnt leading airplane just following around keep ing range wasnt trying anything keep crashing plane went wanted within radio range George said want solo have start making plane go directly point another fly predetermined route wandering chang ing course have accomplish order able set up landing approach course stay landing simply matter flying approach pattern lower lower until finally can just cut throttle let settle runway Well next few weeks flying pattern constantly remember first time came down runway 15 feet air thought skimming deck George usually would still yell him someone land thought fuel getting low day yelled George entered base leg said Cut throttle As did turned hand him transmitter walking away yelled just said Land kept walking Falcon rolled stop still its wheels piece happiest guy Linn County George Bill club now other guys around can much George Bill Jim others did Just give chance Happy landings Thanks Ed beginners can put selves article benefit Maybe epitaph some airplanes can postponed Speaking epitaphs John Thomas editor West Orange Sunfliers Orlando FL newsletter Sun beam published following RIP lies airplane red blue white turned left should have turned right last two weeks have enjoying new exciting phase radio control modeling purchased Kraft Eleck Rider motorcycle KP-2A radio systern After about three hours assembly cycle operating Continued page 96 26 Model Aviation Van Putte Mustang sports license plate 10 conTests aii over oeep uuth Ron says honk wave see car give him call CB airplanes may get crack two out coupie 01 keep going Celastic patches decorated Magic Marker ld Roberts ship looks luxurious nocing ne put iii painted interior adhesive sprinkled flocking Purchasing R/C Aircraft easy YOUNIQUE AT Hobby Capital keep large ready supply af Custom-Bilt RC Aircraft Kits Engines RC Units times And. thanks ta years af experience dealing people sections af US. prepare special ane-of-a-kind RC Aircraft far special one-ofa-kind RC Flyer wha demands unique laok express tastes Chances youll find custom paint finish exquisite detailed cockpit interiors glassed engine compartments real scale wheels custom grilled nose section will knock socks offi. youll probably never see another like cause Hobby Capitol expert stressed preparation goes far beyond standard checkout RC shoppers turning up increasing numbers convenient showroom because word out. outstanding buys service finest selection unique RC Aircraft anywhere its HOBBY CAPITOL Old Ignition Trode4n Buy sell old time ignition engines Box up what have send us honest appraisal could worth new proportional set have engines can also start collection welcome built-up airplanes used proportionals old time ignition engines Come trade us lop dollar paid Built Order Rons Kt stock choose Its s400OO Pipet Tri-Poce Quarter Scale 89 wingspan 42 Sq Ft detailed plans $1699 PR Send $i00 self addressed stamped envelope far detailed list Built-Up R/C Models ond 50% Sale Hobby Capitol 46 N Oak St Ventura CA 93001 Phone 805 643-7616 / 642-8465 efforts promote models look fly like full-size counterparts may finally blossom ing full bloom Las Vegas TOC thing andthe IMAC organization promoting aerobatic models have copies full scale machines CAP addition pack hopefully add pleasure others just did Glen Hazel Sig gang up Iowa doing share promote IMAC philosophy decide build CAP sashay up next year enjoy bash put benefit us modelers RC Aerobatics/Van Putte continued page 26 street front house said technique faultless beginning Eleck Rider performed perfectly Id half truthful cycle did perform perfectly technique left lot desired initially poor driving ability its advant ages Whenever lost control cycle spun out ran curb dashed under car clobbered mailbox post demonstrated durability system After two weeks hard use 13 novice drivers cycle has scuff marks acetate fairing evidence its hard life its tough first questions someone has never seen perform asks difficult keep upright answer very simple Its easy Unless driver does something upset cycle will happily drive forever straight line want turn thats different story Eleck Rider requires coordination ofthrottle steering negotiate turn tighter turn coordination required Steering accomplished turning front forlc done tilting fork front wheeVfork castered free turn direction So does cycle steer Very nicely thank extremely stable too have hit number obstructions include rocks manhole cover cracks pavement acorns jumping ramp etc very few exceptions cycle has stabilized itself motored electric motor operated servodriven rheostat throttle stick has spring return center Forward movement stick provides proportional forward speed Pulling back stick causes motor function like generator acts brake dead man throttle feature nice beginners since cycle will stop itself let go stick best place leam operate Eleck Rider large smooth area like parking lot Once driving proficiency achieved large area smaller places can tried out cycle started holding upright advancing throttle holding stable briefly acceler ates Initial operation should about R3 throttle gentle tums should attempted Sharper turns must accomplished throttling back turning cycle throttling up about halfway through turn slower cycle sharper turn can cycle will fall over gets too slow key success proper coordination throttle takes proficient RC pilot less half hour learn operate Eleck Rider Part problem RC newcomers will have deciding way move stick cycle heading toward An experienced pilot has advantage area because has already learned control airplane coming toward him Unfortunately old rule stick toward low wing doesnt help much motorcycle Am enjoying Eleck Rider Well weekday huny home work drive 30 minutes before gets dark weekends tough get chores done before taking out So far havent able racing others because first kid block have However several others way will probably racing around water-filled milk jugs local parking lot read Get case youve wondering next Pattern Problem Month will appear answer ts receive someone response request problems has very underwhelming Ron Von Puttg 12 Connie Drive Slzalimart FL 32579 Spin Tunnel Robelen continued page 24 good brands really am stuck Hot Stuff type glue truly superior Very light weight will never warp thinnest tail surface course dries immediately other brands Zap Jet etc areallfine Imsure Ijusthavenothadmuch experience Various finish techniques useful Sometimes apply coat sanding sealer Testors Hot Fuel Proof trim color am also pleased results using spray dyes use Deep-flex brand spray can found local variety store usual method construction start fuselage lightly tack glue two blocks together part vertical centerline first shape top view side view followed careful shaping 96 Model Aviation MAMMOTH SCALERS nce have available reeglete line enganeasmts alal eufflers enat 90 So 15 engines srsis OIaDRA WEBRA ar etc Wgite call far catalog emS price info Quarter Headquarters U 12321 5am raulmCaS4iI2 334,, contours After shaping pop blocks apart hollow out inside gouge blades nose area may left solidz however tail aft wing must quite light wing shaped suitable thickness balsa sheetfirst cutting planform forming airfoil finally setting dihedral place wings usually mounted cutting away appropriate area fuselage glueing wing place fairing necessary tail surfaces must very light therefore attempt form airfoil shapes etc Rather sand piece sheet balsa quite thin 0 10inch cut tail pieces fastened place tiny drops Hot Stuff finish may now applied after model ready balancing addition al ballasting scale weight etc As rule have able set control surfaces models moistening lightly bending have yet found need hinging controls nor could have built models good starting point controls set elevator up rudder spin direction ailerons against spinfor example up elevator left rudder right aileron aid launching made small paddle dowel handle wire rim fine mesh fabric center model placed nose facing launcher held open trap-door launching using finger same hand hold trap-door open model launched gently flicking wing tip finger other hand both starts model spinning propels tunnel throat trap-door allowed fall shut tunnel rpm adjusted balance spinning model Take word it whole lot easier show try describe old expression practice makes perfect really applies things happen pretty quickly As much research things always simple appear case am referring specific phenomena encounter ed tiny models cases models would maintain spin given set conditions though certain should looking answers already assuming lack agreement due Reynolds Number some other scaling effect Disturbing was still pleased overall effect models would spin smoothly fine demonstrations etc Playing hunch evening fastened strip scotch tape wing leading edges problem models form crude flap result dramatic model would spin readily rate spin spin angle-of-attack etc quite close what expected Fine tuning trimming tape produced flap about one-half wingspan one-tenth chord tape flaps place almost models will spin expected considering general lack knowledge prototype behavior effort better understand phenomena constructed small wing mounted force measurement scale another small wind tunnel Runs made tape flaps place As lift curves show lift developed especially higher angles attack such encountered tail spin will try draw lofty conclusions thisjust pass along data As photographs would indicate models patterned after current general aviation lightplanes has both good bad Bad because general lack information about spin behavior full scale aircraft prevents direct comparisons However category airplanes has areas March 1 980 97 Al Superiority HOT STUFE FOR THE MODELER WHO MUST HAVE MAXIMUM STRENGTH DEEP PENETRATION LIGHTEST WEIGHT VERSATILITY UNCOMPROMISING QUALITY INSTANTLY TIP BOOKLETS FREE ATOR YOUR HOBBY DEALER SEND SELF ADDRESSED STAMPED ENVELOPE TO iiGtfldO PROPELLERS Made polyester boil color Go GRISH propeller True helical pitch airfoil win-power Sizes pitches styles needs AT YOUR DEALER 2 Blade Tractor 5-3each 545354USc 63645Cc 747678Sc 8486887Cc 949-697 9810410-6Sc 11411-6118 *1 12412612-6815 2 Blade Pusher 5b3 5-4 6-36-4 Nc 8-6 Sc 9-610-681 3 Blade Tractor 53 6-364Nc 3 Blade Pusher 63Nc Metallic- Color Tractor 7678*1 8688*13 96 061041N Pusher06*15 design sensitivity small changes make dramatic differences tailspin behavior sensitive areas include wing airfoils wing location high wing low wing tail design fuselage contours especially behind wing control surface deflections C G location mass distri bution etc no perfect size spin models started models about two-in wingspan very convenient launching ease staying away tunnel walls recently have begun build larger models three-in wingspan have advantages easier construction possible interchangeable parts well being likely meet ballpark inertia requirements main drawback relates launching tunnel larger models tend strike walls easily sensitive design areas especially tailspin motions decided design own general aviation research modeL model theDBR-2 Special includes blend GRISH LARGE WOOD PROPELLERS HARDWOOD too hard minimizes chance costly plane engine damage True pitch airfoil fully finished balanced ready coating 3/8 BOREALL SIZES IN18 57 6 8 & 10 PITCH 20 8 22 10 24 13 RIGHT HAND TRACTOR BROS GRUSH ST JOHN INDIANA 46373 shapes found modern full-scale designs As drawn model portrays force set-up will tend have flat no-recovery spin mode may changed altering areas modeL have made several tail assemblies T-tail etc alone make dramatic differ ences spin behavior using basic model changing just piece time possible analyze results proposed design changes introducing too variables once also very interesting build actual scale models familiar airplanes Please very cautious about drawing conclusions live era product liability lawsuits simply amazing would want ever take chance falsely accusing brand airplane usual obstacle building scale models still applies namely lack information scrounging around have found several sources very helpful Jones Pocket Book Series great reference source some company brochures also excellent three-view drawings published various magazines Mass data typically hard find probably will require cross-referencing Generally published drawings larger desired larger cities will hae some photocopy machine capable making copies reduced size very 100 Model Aviation ALWAYS AVAILABLE AT YOUR HOBBY DEALER Satellite City PO Box 836 Simi CA 93065 805 522-0062 1 / 3 NEW SIZE IN 8 & 10 PITCH 26 $16 MINIATURE SPIN TUNNEL Model Test comparisons Models Approx 2 Wingspan ModelTunnel RPMSpin RateSpin AOA R PSDegrees Yankee #4 Tail410 0 85 Yankee #6 Tail610 50 ankee V Tail530 50 55 Yankee r Tail510 0 55 Sundowner520 30 35 PSU-1380 0- 75 BD-55580 5-80 BDSL480 5-80 F4U corsair580 5 50 cessnalso610 25-30 Piper Twin420 5 70 Variviggen520 30- 35 Zonker480Oscillatory VariezeNO SPIN handy shrinking job Photographic techniques would fine available use handy pocket calculator reduce dimensions draw plan grid paper As rule small detail may safely omitted antenna door latches etc changing results According tests NASA spin tunnel landing gear does affect model spin behavior measurable way reason leave delicate parts off models always refinements possible type project method measuring air velocity would real asset would method easily measuring spin rate models have experimented strobe light Seemingly no end variations possible project sort will always looking opportunities improve equipment techniques involved Maybe some day can find RC system tiny enough fit models could observe recovery behavior also Todays dream to-1 morrows project has theme through effort anyone would like correspond will try answer mail especially selfaddressed stamped envelope Happy spinning REFERENCES I Janet Pocket Book Series such Light Aircraft etc 2 Burt S M. Jr Bowman J S. Jr white E L SpinTunnel Investigation Spinning Characteristics Typical Single-Engine General Aviation Airplane Designs NASA Technical Paper 1009 September 1977 3 Beechcraft Today company hrochnre 4 Powers Bradford Ahout Size Model riarian January 1978 5 Powers Bradford Lets Talk About Reynolds Numbers Model Aviation February 1979 RC Pylon/Hager continued page 27 100% profit ideas get members wife bake cookies cupcakes brownies items sell very well 100% profit Always buy large size jars catsup mustard relish creamer sugar coffee Buy cups case What isnt used can saved another contest Dont sell items too high price want make profit dont overdo club can make several hundred dollars just well-run concession stand good example well-planned race annual Fort Wayne Flying Circuits Pylon Races run Jim Gager Jim club spend lot time before race day promoting As non-profit club can usually get free publicity local radio stations television helps promote sport gets public out see racing people also spend money club also gives out several hundred dollars prize money seems working year turn-out up 79 contest 28 entries Formula 36 entries Quarter Midget results Formula 11 Jim Moorehead 2 Bob Reuther 3 Dave Keats 4 Bill Johnason 5 Bob Onori 6 William Preis 7 Wayne Yeager 8 Eric Meyers 9 Al Grove 10 Art Arro Quarter Midget 1 Doug Bebensee 2 Duane Gall 3 Gail Jacobson 4 Dennis Sumner 5 Brian Richmond 6 Floyd Fitzgerald 7 Ken Heatlie 8 John Kilsdonk 9 Dave Timcoe 10 Allen Booth Any might have some ideas tips running successful race send will pass Bill Hager 4622 Bridgeport Dr Garland TX 75043 Inexpensive key word ACES new line R/C kits called Silver Series line offers unique combination value wide range versatility found todays R/C market until now cutting out biggeal costs Labor furnish kit furnish labor allows us give top-quality product inexpensive price comparable $800 radios its featuren * SERVO REVERSAL SWITCHES--With ists flip aft switch terso travel direcriae etch four psievasy channets rue reversed INDEPENDENT THROW ADJUST-On chavuels amount servo travel can cos stalled independeerty * EtETH CHANNEL ADItJST--Seeno position whea retract switch either le Up Down posirice ledepeedeutly adiastabte * TRtM LOCATtON rARtABLES-flee marion af trims us builders discrerivo cue have standard trim crossed trim cemhiaatioe two TRtM AUTI-IORITY PROORAMMABILITYBy ebasgiag plug-in lived resistors amouas remo esoursios whes tIre trims mooed programmable * DUAL RATE--Switches aed adiusemeet pats famished provide DUAL RATE up three channels EXPONENTIAL RATE OPTtONThis ptughs option provides ean-liarar servo teasel se klatioe snob movement up three vhannels 5t795 ELECTRONIC MIXER OPEIONWith plug-in modate two functices cue N k-i together tither onidirectiaerlly arhidireosioeally lSlt95 * PROGRAMMABLE PUSH BUTTON OPTION-te-tight adiustable peepeogeammed covasot surface muermena may obtained push g h $89 THE SILVER SEVEN $28495 Full ni cd system kit receiver four servos two classics Flyline Farman Moustique SEE YOUR LOCAL HOBBY DEALER send 25c catalog 34 span 020 power $1595 QUAKER FLASH single Channel nC Power free flight Y9 Wtngspan FLYLINE MODELS INC aaaa DORR AVENUE lB FAIRFAX VtAGINIA aunas 17031 5732t38 March 1980 101 Cheek wish Ane dealer metre naIl nomptate datailt crws S complete Catalogs $100 lasid $BOfo CaunMa urnl Box 511E 119W 19th. Higginsville Mo 64037 816 584-7121 COMING SOON 117e READY NOW
Edition: Model Aviation - 1980/03
Page Numbers: 20, 21, 22, 23, 24, 96, 97, 98, 99
both magazine state R IUJNN L art pleased present uniqu report As will see author brought work home him TAILSPIN Flat spin other performed deliberate tailspins some time during very rapidly nose-high attitude Generally related terms phrases associated sport fun flying session Occasionally attempts recover useless model important hut little understood area airplane spin begunusually anew design non- crashes Rare unusual No Mysterious flight Most us fly RC models have standard styling model will begin rotate Yes Lest modelers feel lonely designers About release model 2-in span PSU-1 0~rvihg spin test operation tinyPenn State University Dave prepares flickDave retrieves PSU-1 through hatch model plainly seen through windowleft wing tiptunnel bottom certainly tiny 20 Model Aviation full-scale aircraft occasionally experience same dilemma Perhaps can imagine results study research aircraft tailspins has subject much energetic effort research teams ofthe valuable facilities research type spin tunnel concept involves wind tunnel standing vertically air being drawn upward fan mounted top Models launched whirling motion like frisbee rising air within spin tunnel fan rpm adjusted just balance descent rate model being tested result opportunity closely study motion behavior model Research facilities nature quite rare being two free world NASA has Langley Field Virginia other located France NASA spin tunnel measures twenty feet across test chamber usual model size about two feet wingspan models equipped RC operate controls thus making possible study recovery behavior work NASA-Langley am often exposed spin-tunnel tests have become quite fascinated very safe method testing critical motions model airplanes Lacking priority compete testing time ADJUST GAP TO CALIBRATE RELAY COIL C7j37ORTH MAGNET 3N DIA1/8 THICK WOOD OR PLASTIC6O NI1N34A 0 PM 0 aN magnetic tachometer made Radio Shack parts Magnets glued plastic disk glued fan assembly Relay coil mounted wood cross member position coil tweaked achieve desired output meter C B H9 10 rH B25 RADIUS INSIDE 3 fA TUNNEL CROSS SECTIONS ALL DIMENSIONS ARE INSIDE tunnel made cardboard Plexiglass windows hinged strapping tape Masking tape liberally used hold things together along Titebond glue II 3 lur lower area rapidly spinning Beechcraft 33 right-turn spin RELAY COIL 8KfL vi IOmF c-c I5 F 15BB // AA / rirai evaion moaels aii Z- Span lop Bottom Bede BD5-J Cessna 150 Piper Arapahoe Penn State PS U-i 30 05 3M I--5 i ASIC WINC WFH urn / V /1/ / ESi VELOCITY 20 0 30 40 graph shows effect leading edge flaps wing lift Full-size airfoil top right NASA spin tunnel began wonder about constructing very own having budget federal agency began realize spin tunnel would have just bit smaller perhaps little less elegant search house shop tumed up floor fan 20-inch diameter blades variable transformer controlled just fine Finding contours wind tunnels small sizes rather tricky business chose cardboard structural material avail able wherever grocery stores found easily modified miniature spin tunnel scale model larger unit specific design tailored job intended detailed construction article therefore will speak general terms omit detailed construction information spin tunnel fashioned cardboard has Plexiglass viewing windows used jigsaw cut launching hatch window hinged strapping tape Masking tape used jiberally hold things together along Titebond glue Strips wood support fan unit top well providing bottom frame legs flow-straightener grid bottom too may cardboard silk-like polyester fabric net stretched across grid serves two purposes smooth airflow catch models bottom rather large hatch cut bottom cone purpose retrieving 22 Model Aviation 8 6 CL / f. / oz U UlO rz z 0 C I1 0 0 I1 IThe launch padd9e Model placed nose facing launcher held theopentrapdoor launching using finger same hand hold open door Tools used making miniscule planes scales Iauncn paddle Models Mooney M2OC left four 2- span Yankees variety tail configurations EAA biplane 0-1 gram scale6-in machiniaL rule ulCyluUllu models desk lamp borrowed son s room used light jAterior painted interior flat black could see models spray-painted outside silver aerosol canlooks better assorted grocery cartons tachometer shown constructed parts purchased local Radio Shack store See sketch schematic details magnets glued plastic disk glued fan assembly mounted relay coil wooden cross-member tweaked position coil achieve desired output meter As spin tunnel began taking shape became obvious size models would quite small experience industrial test models aware need properly scale weight balance inertias dimensions spin test models measure values another matter have found six-inch long machinists ruler best friend measur ing tiny model dimensions can bought graduations / 100-inch found wherever machinist tools sold Try Sears Roebuck Measuring weight another problemi General ly complete model will weigh between one-tenth N I IIII liii I I Ifer 800 600 1 0 20C 0 j K MINIATURE SPIN TUNNEL MAXIMUM OUTPUT 21FPS AT 980 RPM inL --II 12 16 VELOCITY RPS graph provides values air velocity ft/sec read against rpm fan gram gram depending model scale prototype weight solution construct scales job simple spring wire scale shown handy weighing parts quickly during construction exotic beam scale super weighing complete models Check drawings specific details scale custom job Construction follows same theme specific variations noted Generally used Hot Stuff type glue throughout bonding 20 halta wood structure beam scale pivots two strips copper wire resting new razor blade no nicks please Calibration tiny scales accomplish ed follows length 1/32-in wire solder trimmed until weighed exactly gramlocal druggist piece measured length recorded Short pieces solder cut length one-tenth long 1/100 full length gave calibration weights Balance Notes 1 balsa 2 Assemble Hot Stuff 3 Two slide weights ten times weight other 4 Lead counterweight just balances 5 Maximum range determined slide-weights Dave sets balance 1 gram pan both maximum travel Again reduce size drawing Bottom piece plus 3/16 sq right measures B inches 1/32 PAN I/16X 1/16 / STOP PINS 0 3116x 3/16 3/16X 3/40 V March 1980 23 0 Three 2-in canards top bottom Zonker Rutan Variviggen Rutan VariEze COUNTER WEIGHTSLIDE WEIGHTS -TWO WIRE BEARINGS DBR-2 Special hypothetical full-scale prototype Span 25 ft area 104 sq ft. weight 1500 lbs Model 1/100th scale Span 3 in. area 15 sq weight 68 grams CG 25% chord As shown model should have flat no-recovery spin mode moving stab higher T-tail interesting effect would immediately noticed .-i ri-rn PANJ} 1132 H 1/32 X 3/16 x 112 ALL WOCO IS BALSA I/ l14X 3/4e BASE WIRE WITHOUT PAN 3/l6aX 3/16 gram one-tenth gram 1/100 gram used calibrating marks various scale bars Checking balance tiny models also requires special set-up None old fingertip under wingtips use 020-in music wire length wire passing through fuselage desired balance location Two lengths wire glued strip wood model suspended across handiest material ballast thin lead cut small slivers pointed shapes push nose needed trimming lead until model hangs level balance wires aircraft spinning moments inertia about various axis have major influence spin behavior value have developed proper technique measur ing would appreciate suggestions present method construct models simulate empty weight prototype airplane add weight center model until matches scale gross weight prototype Additionally distribution mass prototype must considered since twinengine design tip tanks will very different single-engine planes respect Construction dwarf scale models much less difficult first appearances Real ly patient reader will share some techniques hope shedding some light matter tools expensive exotic yet has purpose Tweezers nearly essential really sharp knife prefer Uber Skiver No 11 blade however really sharp X-Acto will job too Good sharp single-edge razor blades always handy especially broken special shapes pliers hollow out fuselages models X-Acto gouges great usual sanding blocks out question use sandpaper glued onto coffee stirring sticks can made up shapes different sandpaper grits six-in ruler just right measurements magnifying glass real asset Any other tools equipment found under miscellaneous pins razor saw etc Balsa wood favorite material far just has lightest easiest working material available tiny models require little sheet seems last forever am real choosy wood selecting clear-grained unwarped extremely light stock favorite Sig Contest Balsa although plenty Continued page 96 Scale calibrated short lengths wire solder Ex 125 1/32 solder equals 1 gram 125 equals 01 gram could show drawing full-size prepared author dimensions base piece rear upright both 4 inches 24 Model Aviation Beechcraft Sundowner 0-25 gram springwire scales Dave dreams someday finding RC system fit little aircraftJ DRAWN FULL SIZE QL ii L OPTIONAL TAPE FLAPS QHARP A-A CORNER 3FA -LA II 0 5 dii SPORT AEROBATICS Ron Van Putte COUPLE months ago 1 mentioned instructor problem some clubs have tunately club has excellent instruction program beginners largely due enthusiasm club instructors feature program other clubs might like copy awarding solo certificates novice pilot instructor club meeting Blank certificates printed up club president Ed Moorman AMA DistrictS AVP North Florida Ed types appropriate information about novice pilot gives completed certificate instructor presentation Both novice pilots instructors like idea club might like try too Good instructors leave helpful hints students reading club newsletters ModelAviations publisher Carl Wheeley sends came across great article Ed Cocciola Cedar Rapids low Skyhawks newsletter Logbook good advice contained Eds article bears repeating printing slightly edited version Notes Novices Since 1973 have seen lot Skyhawks pass through club Some made quite contribution own way talking about couple dont mean slight ofthose dont mention also made contribution said have reason bringing up particular ones wanting solo summer still needed someone take off after wandering around sky fur 10 15 minutes Id yell someone land Sound familiar bet doing since summer before day plane starting spin trying figure out should giving left turn right turn Bill Birkey grabbed trans mitter straightened Out regained lost altitude still wasnt flying less three mistakes high done count less times before Jim Clark once grabbed transmitter pulled Falcon 56 out spin about four feet off deck day stood watching crash However Bill Birkey did something different stuck handed back transmitter day said shes coming Ed watch low wing straighten up just push stick low wing Now isnt simple time trying mentally sort out plane coming turning toward right really planes left means have push stick? Oh hell has crashed now anyway quick easy just push toward low wing need know left right Maybe thats problem Right quit getting much trouble began really enjoying flying wasnt getting closer making landings day later summer George Moger came over asked flying plane flying up doing usual aimless wandering routine did know what meant explained wasnt leading airplane just following around keep ing range wasnt trying anything keep crashing plane went wanted within radio range George said want solo have start making plane go directly point another fly predetermined route wandering chang ing course have accomplish order able set up landing approach course stay landing simply matter flying approach pattern lower lower until finally can just cut throttle let settle runway Well next few weeks flying pattern constantly remember first time came down runway 15 feet air thought skimming deck George usually would still yell him someone land thought fuel getting low day yelled George entered base leg said Cut throttle As did turned hand him transmitter walking away yelled just said Land kept walking Falcon rolled stop still its wheels piece happiest guy Linn County George Bill club now other guys around can much George Bill Jim others did Just give chance Happy landings Thanks Ed beginners can put selves article benefit Maybe epitaph some airplanes can postponed Speaking epitaphs John Thomas editor West Orange Sunfliers Orlando FL newsletter Sun beam published following RIP lies airplane red blue white turned left should have turned right last two weeks have enjoying new exciting phase radio control modeling purchased Kraft Eleck Rider motorcycle KP-2A radio systern After about three hours assembly cycle operating Continued page 96 26 Model Aviation Van Putte Mustang sports license plate 10 conTests aii over oeep uuth Ron says honk wave see car give him call CB airplanes may get crack two out coupie 01 keep going Celastic patches decorated Magic Marker ld Roberts ship looks luxurious nocing ne put iii painted interior adhesive sprinkled flocking Purchasing R/C Aircraft easy YOUNIQUE AT Hobby Capital keep large ready supply af Custom-Bilt RC Aircraft Kits Engines RC Units times And. thanks ta years af experience dealing people sections af US. prepare special ane-of-a-kind RC Aircraft far special one-ofa-kind RC Flyer wha demands unique laok express tastes Chances youll find custom paint finish exquisite detailed cockpit interiors glassed engine compartments real scale wheels custom grilled nose section will knock socks offi. youll probably never see another like cause Hobby Capitol expert stressed preparation goes far beyond standard checkout RC shoppers turning up increasing numbers convenient showroom because word out. outstanding buys service finest selection unique RC Aircraft anywhere its HOBBY CAPITOL Old Ignition Trode4n Buy sell old time ignition engines Box up what have send us honest appraisal could worth new proportional set have engines can also start collection welcome built-up airplanes used proportionals old time ignition engines Come trade us lop dollar paid Built Order Rons Kt stock choose Its s400OO Pipet Tri-Poce Quarter Scale 89 wingspan 42 Sq Ft detailed plans $1699 PR Send $i00 self addressed stamped envelope far detailed list Built-Up R/C Models ond 50% Sale Hobby Capitol 46 N Oak St Ventura CA 93001 Phone 805 643-7616 / 642-8465 efforts promote models look fly like full-size counterparts may finally blossom ing full bloom Las Vegas TOC thing andthe IMAC organization promoting aerobatic models have copies full scale machines CAP addition pack hopefully add pleasure others just did Glen Hazel Sig gang up Iowa doing share promote IMAC philosophy decide build CAP sashay up next year enjoy bash put benefit us modelers RC Aerobatics/Van Putte continued page 26 street front house said technique faultless beginning Eleck Rider performed perfectly Id half truthful cycle did perform perfectly technique left lot desired initially poor driving ability its advant ages Whenever lost control cycle spun out ran curb dashed under car clobbered mailbox post demonstrated durability system After two weeks hard use 13 novice drivers cycle has scuff marks acetate fairing evidence its hard life its tough first questions someone has never seen perform asks difficult keep upright answer very simple Its easy Unless driver does something upset cycle will happily drive forever straight line want turn thats different story Eleck Rider requires coordination ofthrottle steering negotiate turn tighter turn coordination required Steering accomplished turning front forlc done tilting fork front wheeVfork castered free turn direction So does cycle steer Very nicely thank extremely stable too have hit number obstructions include rocks manhole cover cracks pavement acorns jumping ramp etc very few exceptions cycle has stabilized itself motored electric motor operated servodriven rheostat throttle stick has spring return center Forward movement stick provides proportional forward speed Pulling back stick causes motor function like generator acts brake dead man throttle feature nice beginners since cycle will stop itself let go stick best place leam operate Eleck Rider large smooth area like parking lot Once driving proficiency achieved large area smaller places can tried out cycle started holding upright advancing throttle holding stable briefly acceler ates Initial operation should about R3 throttle gentle tums should attempted Sharper turns must accomplished throttling back turning cycle throttling up about halfway through turn slower cycle sharper turn can cycle will fall over gets too slow key success proper coordination throttle takes proficient RC pilot less half hour learn operate Eleck Rider Part problem RC newcomers will have deciding way move stick cycle heading toward An experienced pilot has advantage area because has already learned control airplane coming toward him Unfortunately old rule stick toward low wing doesnt help much motorcycle Am enjoying Eleck Rider Well weekday huny home work drive 30 minutes before gets dark weekends tough get chores done before taking out So far havent able racing others because first kid block have However several others way will probably racing around water-filled milk jugs local parking lot read Get case youve wondering next Pattern Problem Month will appear answer ts receive someone response request problems has very underwhelming Ron Von Puttg 12 Connie Drive Slzalimart FL 32579 Spin Tunnel Robelen continued page 24 good brands really am stuck Hot Stuff type glue truly superior Very light weight will never warp thinnest tail surface course dries immediately other brands Zap Jet etc areallfine Imsure Ijusthavenothadmuch experience Various finish techniques useful Sometimes apply coat sanding sealer Testors Hot Fuel Proof trim color am also pleased results using spray dyes use Deep-flex brand spray can found local variety store usual method construction start fuselage lightly tack glue two blocks together part vertical centerline first shape top view side view followed careful shaping 96 Model Aviation MAMMOTH SCALERS nce have available reeglete line enganeasmts alal eufflers enat 90 So 15 engines srsis OIaDRA WEBRA ar etc Wgite call far catalog emS price info Quarter Headquarters U 12321 5am raulmCaS4iI2 334,, contours After shaping pop blocks apart hollow out inside gouge blades nose area may left solidz however tail aft wing must quite light wing shaped suitable thickness balsa sheetfirst cutting planform forming airfoil finally setting dihedral place wings usually mounted cutting away appropriate area fuselage glueing wing place fairing necessary tail surfaces must very light therefore attempt form airfoil shapes etc Rather sand piece sheet balsa quite thin 0 10inch cut tail pieces fastened place tiny drops Hot Stuff finish may now applied after model ready balancing addition al ballasting scale weight etc As rule have able set control surfaces models moistening lightly bending have yet found need hinging controls nor could have built models good starting point controls set elevator up rudder spin direction ailerons against spinfor example up elevator left rudder right aileron aid launching made small paddle dowel handle wire rim fine mesh fabric center model placed nose facing launcher held open trap-door launching using finger same hand hold trap-door open model launched gently flicking wing tip finger other hand both starts model spinning propels tunnel throat trap-door allowed fall shut tunnel rpm adjusted balance spinning model Take word it whole lot easier show try describe old expression practice makes perfect really applies things happen pretty quickly As much research things always simple appear case am referring specific phenomena encounter ed tiny models cases models would maintain spin given set conditions though certain should looking answers already assuming lack agreement due Reynolds Number some other scaling effect Disturbing was still pleased overall effect models would spin smoothly fine demonstrations etc Playing hunch evening fastened strip scotch tape wing leading edges problem models form crude flap result dramatic model would spin readily rate spin spin angle-of-attack etc quite close what expected Fine tuning trimming tape produced flap about one-half wingspan one-tenth chord tape flaps place almost models will spin expected considering general lack knowledge prototype behavior effort better understand phenomena constructed small wing mounted force measurement scale another small wind tunnel Runs made tape flaps place As lift curves show lift developed especially higher angles attack such encountered tail spin will try draw lofty conclusions thisjust pass along data As photographs would indicate models patterned after current general aviation lightplanes has both good bad Bad because general lack information about spin behavior full scale aircraft prevents direct comparisons However category airplanes has areas March 1 980 97 Al Superiority HOT STUFE FOR THE MODELER WHO MUST HAVE MAXIMUM STRENGTH DEEP PENETRATION LIGHTEST WEIGHT VERSATILITY UNCOMPROMISING QUALITY INSTANTLY TIP BOOKLETS FREE ATOR YOUR HOBBY DEALER SEND SELF ADDRESSED STAMPED ENVELOPE TO iiGtfldO PROPELLERS Made polyester boil color Go GRISH propeller True helical pitch airfoil win-power Sizes pitches styles needs AT YOUR DEALER 2 Blade Tractor 5-3each 545354USc 63645Cc 747678Sc 8486887Cc 949-697 9810410-6Sc 11411-6118 *1 12412612-6815 2 Blade Pusher 5b3 5-4 6-36-4 Nc 8-6 Sc 9-610-681 3 Blade Tractor 53 6-364Nc 3 Blade Pusher 63Nc Metallic- Color Tractor 7678*1 8688*13 96 061041N Pusher06*15 design sensitivity small changes make dramatic differences tailspin behavior sensitive areas include wing airfoils wing location high wing low wing tail design fuselage contours especially behind wing control surface deflections C G location mass distri bution etc no perfect size spin models started models about two-in wingspan very convenient launching ease staying away tunnel walls recently have begun build larger models three-in wingspan have advantages easier construction possible interchangeable parts well being likely meet ballpark inertia requirements main drawback relates launching tunnel larger models tend strike walls easily sensitive design areas especially tailspin motions decided design own general aviation research modeL model theDBR-2 Special includes blend GRISH LARGE WOOD PROPELLERS HARDWOOD too hard minimizes chance costly plane engine damage True pitch airfoil fully finished balanced ready coating 3/8 BOREALL SIZES IN18 57 6 8 & 10 PITCH 20 8 22 10 24 13 RIGHT HAND TRACTOR BROS GRUSH ST JOHN INDIANA 46373 shapes found modern full-scale designs As drawn model portrays force set-up will tend have flat no-recovery spin mode may changed altering areas modeL have made several tail assemblies T-tail etc alone make dramatic differ ences spin behavior using basic model changing just piece time possible analyze results proposed design changes introducing too variables once also very interesting build actual scale models familiar airplanes Please very cautious about drawing conclusions live era product liability lawsuits simply amazing would want ever take chance falsely accusing brand airplane usual obstacle building scale models still applies namely lack information scrounging around have found several sources very helpful Jones Pocket Book Series great reference source some company brochures also excellent three-view drawings published various magazines Mass data typically hard find probably will require cross-referencing Generally published drawings larger desired larger cities will hae some photocopy machine capable making copies reduced size very 100 Model Aviation ALWAYS AVAILABLE AT YOUR HOBBY DEALER Satellite City PO Box 836 Simi CA 93065 805 522-0062 1 / 3 NEW SIZE IN 8 & 10 PITCH 26 $16 MINIATURE SPIN TUNNEL Model Test comparisons Models Approx 2 Wingspan ModelTunnel RPMSpin RateSpin AOA R PSDegrees Yankee #4 Tail410 0 85 Yankee #6 Tail610 50 ankee V Tail530 50 55 Yankee r Tail510 0 55 Sundowner520 30 35 PSU-1380 0- 75 BD-55580 5-80 BDSL480 5-80 F4U corsair580 5 50 cessnalso610 25-30 Piper Twin420 5 70 Variviggen520 30- 35 Zonker480Oscillatory VariezeNO SPIN handy shrinking job Photographic techniques would fine available use handy pocket calculator reduce dimensions draw plan grid paper As rule small detail may safely omitted antenna door latches etc changing results According tests NASA spin tunnel landing gear does affect model spin behavior measurable way reason leave delicate parts off models always refinements possible type project method measuring air velocity would real asset would method easily measuring spin rate models have experimented strobe light Seemingly no end variations possible project sort will always looking opportunities improve equipment techniques involved Maybe some day can find RC system tiny enough fit models could observe recovery behavior also Todays dream to-1 morrows project has theme through effort anyone would like correspond will try answer mail especially selfaddressed stamped envelope Happy spinning REFERENCES I Janet Pocket Book Series such Light Aircraft etc 2 Burt S M. Jr Bowman J S. Jr white E L SpinTunnel Investigation Spinning Characteristics Typical Single-Engine General Aviation Airplane Designs NASA Technical Paper 1009 September 1977 3 Beechcraft Today company hrochnre 4 Powers Bradford Ahout Size Model riarian January 1978 5 Powers Bradford Lets Talk About Reynolds Numbers Model Aviation February 1979 RC Pylon/Hager continued page 27 100% profit ideas get members wife bake cookies cupcakes brownies items sell very well 100% profit Always buy large size jars catsup mustard relish creamer sugar coffee Buy cups case What isnt used can saved another contest Dont sell items too high price want make profit dont overdo club can make several hundred dollars just well-run concession stand good example well-planned race annual Fort Wayne Flying Circuits Pylon Races run Jim Gager Jim club spend lot time before race day promoting As non-profit club can usually get free publicity local radio stations television helps promote sport gets public out see racing people also spend money club also gives out several hundred dollars prize money seems working year turn-out up 79 contest 28 entries Formula 36 entries Quarter Midget results Formula 11 Jim Moorehead 2 Bob Reuther 3 Dave Keats 4 Bill Johnason 5 Bob Onori 6 William Preis 7 Wayne Yeager 8 Eric Meyers 9 Al Grove 10 Art Arro Quarter Midget 1 Doug Bebensee 2 Duane Gall 3 Gail Jacobson 4 Dennis Sumner 5 Brian Richmond 6 Floyd Fitzgerald 7 Ken Heatlie 8 John Kilsdonk 9 Dave Timcoe 10 Allen Booth Any might have some ideas tips running successful race send will pass Bill Hager 4622 Bridgeport Dr Garland TX 75043 Inexpensive key word ACES new line R/C kits called Silver Series line offers unique combination value wide range versatility found todays R/C market until now cutting out biggeal costs Labor furnish kit furnish labor allows us give top-quality product inexpensive price comparable $800 radios its featuren * SERVO REVERSAL SWITCHES--With ists flip aft switch terso travel direcriae etch four psievasy channets rue reversed INDEPENDENT THROW ADJUST-On chavuels amount servo travel can cos stalled independeerty * EtETH CHANNEL ADItJST--Seeno position whea retract switch either le Up Down posirice ledepeedeutly adiastabte * TRtM LOCATtON rARtABLES-flee marion af trims us builders discrerivo cue have standard trim crossed trim cemhiaatioe two TRtM AUTI-IORITY PROORAMMABILITYBy ebasgiag plug-in lived resistors amouas remo esoursios whes tIre trims mooed programmable * DUAL RATE--Switches aed adiusemeet pats famished provide DUAL RATE up three channels EXPONENTIAL RATE OPTtONThis ptughs option provides ean-liarar servo teasel se klatioe snob movement up three vhannels 5t795 ELECTRONIC MIXER OPEIONWith plug-in modate two functices cue N k-i together tither onidirectiaerlly arhidireosioeally lSlt95 * PROGRAMMABLE PUSH BUTTON OPTION-te-tight adiustable peepeogeammed covasot surface muermena may obtained push g h $89 THE SILVER SEVEN $28495 Full ni cd system kit receiver four servos two classics Flyline Farman Moustique SEE YOUR LOCAL HOBBY DEALER send 25c catalog 34 span 020 power $1595 QUAKER FLASH single Channel nC Power free flight Y9 Wtngspan FLYLINE MODELS INC aaaa DORR AVENUE lB FAIRFAX VtAGINIA aunas 17031 5732t38 March 1980 101 Cheek wish Ane dealer metre naIl nomptate datailt crws S complete Catalogs $100 lasid $BOfo CaunMa urnl Box 511E 119W 19th. Higginsville Mo 64037 816 584-7121 COMING SOON 117e READY NOW