Occupying seat honor late-model version wing stab covering lightweight Coverite Micafilm Black lettering wing inexpensive stick-on vinyl found stationery department large drugstores like Its state art model Category Ill sites ACTIVE FF GAS enthusiasts reside east Mississippi River certainly aware seemingly endless struggle recent years obtain retain suitable fly ing sites competitions Large sites have become extinct currently available much closer small field variety Some years ago AMA Contest Board recognized need tailor Free Flight competitions according size flying field Categories II LII re sulted special engine run flight time limits separate National Rec ord tally kept three cate gones Whether intended action cer tainly instilled renewed vigor throughout Free Flight community opportunity win contest set national record same time small-field situation provided basis additional incentive enthusiasm three-category system gave small-site contestant chance make record books againa feat become increasingly difficult smaller sites east Big Muddy Smallfield competitors able convert assumed handicap definite challenge Category III contests eventually sumed character own case point am familiar succession contests WrightPatterson AFE Dayton OH following 1976 AMA Nats affair opened previously-unavailable old Wright Field area clubs weekend competitions given days little wind drift site could sustain Category II activity However since high fences enclose historic air base virtually unscaleable four area FF clubs sponsored meets chose 2-mm Category III limits long series contest providing steady diet 5-sec engine run 2-mm max limitson superb flying site four different area clubs sponsoring contests same field near monthly basis rather simple task track progress contestants attacking 5-sec 2-mm challenge time couple flying seasons passed W-P contestants beginning get good grip 5 2 limits unusual endure marathon run ning double digits flyoff flights determine winner course model design engine combinations taking interesting trend Simply adding power existing models such Schnuerle-ported engines necessarily ultimate answer Total model weight deemed important factor attempting squeeze 2 mm flight time out 5-sec engine run Schnuerles although quite powerful also quite heavy spring 1979 lightweight models built around lightweight engines ginning show considerable promise Two initial success stories Gib Robbins superlight rear-finned 320 sq Satellite powered Cox TD 09 Gil Morris early Toothpicks series using light weight Fox engines Gibs model parThe inception several years ago FF Power model rules smaller fields 5-sec engine run 2-mm max required some new thinking avoid being also-ran model Class B has shown its worth under conditionsE Harry Murphy 74 Model Aviation inimitable tongue-In-cheek way Harry Mur phy says Note arrow pointing directly real Nit Wit i great model designer/f puts together witty CIA former newsletter plc Joe Guyias shot Wright Fieid ticularly significant first con sistent lightweight combination begin edging previously-dominant FAI Power entries out Class trophy lines culminated winning Class 1979 Lincoln Nats Category III contest effort curb marathon flyoff situation 1980 rules changed trim Category III flyoff engine run 4 sec after fifth max change eliminated FAI Power model con tention found too heavy glide 2 mm 4-sec engine run 1980 Nats W-P proved Wright Field regulars up task fact first-place trophies Power events taken back across Mis sissippi Ralph Prey years has voiced opin ion have use super-hot engine ensure competitive engine/model combo has often stated building proper model around engine regardless its comparative power can produce very satisfactory results philosophy cer tainly applicable successful presentday Category III models Surrendering old adage cant beat emjoin em Nit Wit came about during spring 1980 completed just time 1980 Day ton Nats intention create smaller-than-normal model would speedy enough reach same altitude 4 sec previous years bigger model reached 5 sec single second may appear very significant 20% right off top power pattern small model would also require very light weight engine total model weight kept minimum would advantageous simply build smaller model total weight also re duced altitude attained power burst could sustained glide remaining 116 sec can very long time glide model leaves something desired After weighing Class en gines lightest far old Cox TD 15 4'4 oz selected first Nit Wit combo its optimistic pilot went 1980 Nats hoping capture marbles Class first three official flights produced three maxes trotted downwind retrieve model third max feeling pretty good about new design However model dethermalized onto rear bumper parked van knocking off engine front fuselage Since insufficient time make appropriate re pairs hurriedly put Cox TD 051 same Lunar-Tic 240 won event previous dayand eventually chugged fourth place spectacular beginning con vinced design would provide lot enjoyment future sure joy fly Since old Cox bit cranky occasion some engine parts difficult obtain stepped up Super tigre G 15 repaired fuselage dur ing following winter power plant switch cost over ounce weight pen alty power increase con siderable First flights using variety 7-4 wood fiberglass props indicated design could really handle excessive power subsequent flights made ST G15/19 special Doc Anderson ST G 15/23 23 piston cylinder crammed GLS crankcase Once trimmed desired power groove design appeared very forgiving changes engine prototype Class model proving excellent test bed subsequent models same size possible scaled-up versions larger FF Power classes After repairing original Nit Wit also crash-built larger version dubbed Dim-Wit prior 1982 Nats fortunate win Class D Lincoln also Category III affair model created same thoughts mind size weight kept minimum Dim Wit 535 sq model weigh ing 26 oz sporting OS Chamberlain 42 can certainly raise few eyebrows faces friendly competitors can state Class D entry weighs 26 ounces particular lightweight engine brainJim Waistons camera caught Nit Wit split second after launch Jim ribs Harry about basketball launchsays looks Harry practicing set shot ship moves child fellow CIA Club member Mere dith Chamberlain first take ad vantage discovery bore current OS Max 40 bit larger bore previous OS Max-H mod els Should mix up parts can produce very reputable engine teresting displacement 42 cu article supposed centered Class design purpose mentioning parallel point out superlight engine/model theory appears work well other clsses Category III com petition well Also incorporation awesome power Schnuerle engine isnt absolutely necessary Anyway think small guysand think lightweight engines well airframes have made large issue select ing lightweight engine maybe would help list some readily avail able engines approximate weights aid eventual engine selection Class OS Max 15 CoxTD 15 OS Max 20 Rossi 15 Fox 19 ST GiS ST G15/19 Class B OS Max 25 ST G20/23 some engines can readily mounted radially could eliminate mount altogether save another ounce up-front weightsomething may wish consider arriving eventual choice Construction Ideally completed model should balance desired CG location addition extra weight either end fuselage achieve recommended wing stabilizer completely finished before work fuselage progresses very far will per mit continual checking CG up final permanent attachment wing pylon atop fuselage box wing pylon final item fabricated Nit Wit particularly difficult model construct begin ners model shall assume may interested details its construction also beginners fore shall attempt refrain taxing integrity experienced modelers supeffluous explanation pins placed Also least cyanoacrylate vendors suggests construction methods pins am pin man myself certainly wish accused being old fashioned recognizing progress apparent Wing stab very difficult start explaining construction wing panel Ounces Grams beginning immortal 415118words Pin leading edge plans 425120Anyway whatever pet procedurebe 55156it pins 3M poster cement concrete 55156blockthe LE notched TE 56158inner wing panels have properly lo 56158cated plans fastened securely 56158place TE wing tip panels simply 55156standard 3A6 X /s tapered stock 58165front edges cut away diagonal resulting natural taper thickness wing tip Continued page 171 Note plan suggests commercial engine mount incorporated However Left no-nonsense rear end shows auto-rudder dethermalizer setup well famous logo Central Indiana Aeromodelers Actually author doesnt currently use auto-rudder function Right business end prototype model sports Supertigre G15 aluminum Tatone mount timer really modified K-Mart camera timer behind AA Tatone flood-off faceplate additional trigger mechanism auto-rudder later deemed unnecessary Note T-fitting flood-off line top engine intake shoots enough fuel intake stop engine dumps rest fuel away model 76 Model Aviation Theres OS Max 25 plain-bearing engine front end photograph Although about 65% larger displacement usual Supertigre GiS power plant model actually couple grams lighter goes show versatility possible considering lightweight engines smaller-than-normal competition FF Power models U THIS INSTALLMENT ON planes fly ing will attempt present something has missing up now much power goes what motor prop bat tery combine suitable model installment will brings series together long promised taken previous parts should assured first-time continuing Electric successwith under standing Thats what call Electric Elation time let repeat something said beginning often difficult impossible have first-hand familiarity everything means best ne picture anove ny uus urumer ana tne smaller below Dy Hera Durks Show parts ot slight line recent electric Fly events put Keystone RC Club large variety highly successful Electrics speaks well form power Only sounds fun audible lettering must still legible soft brush remove eraser residue nice have simply have have good pencil sharpener handy times should using fairly soft pencil about No 2 lead order get lines dark enough reproduction blueprint machine soft pencils should resharpened after few lines Mechanical drafting pencils extendable leads reasonably inexpensive much easier sharpen wooden counterparts last impor tant item good source light either natural artificial Now youve got paper taped drawing board light ruler hand freshly sharpened pencil other Now what First put down pencil put down ruler Before draw have determine two important prerequisites well-drawn nicelyexecuted design what going draw going draw suggest before attempt put design paper graphic form first have paper mathematicallyrepresented form Ive included column copy standard New Design Data Sheet sheet have included parameters feel important either affecting performance com pleted aircraft and/or necessary trans lating numbers construction plan significance parame ters insofar aircraft performance con cerned want deal strictly necessary making drawing now Start wing minimum will have have determined desired span area length root tip chords flap size specifications airfoil terms thick location high point both tip root An additional parameter data sheethut should beis leading edge radius LER Simply put LER circle drawn leading edge airfoil determines relative sharpness bluntness airfoil Lastly should determine planform shape wing ie straight-taper elliptical constant-chord swept forward back etc helpful hint straight-tapered wings straight flap hinge lines easiest build fly best mans opinion whos Now repeat above measurements stab elevator Span area pro portion total area primary concerns Tail thickness still subject jury out personal feel ings have changed preferring rather thick tails belief should thin possible given need structural rigidity Since primary function fuselage simply hold engine keep wing tail proper relationship other few numbers significant long nose going will put wing will put tail Again feel great deal significance what numbers articles purposes Ill leave own opinions save another time Suffice say will have decide parameters before can commit paper Now have good idea what airplane will look like aerodynamically can go back drawing board trans late numbers picture airplane concluded next month Photos comments news about Stunt should addressed Ted Fan cher 158 Flying Cloud Isle Foster City CA 94409 Nit Wit/Murphy Continued oaoe 76 itself bottom spars secured posi tion next ribs turn ce mented securely place locations shown Obviously hold off putting ribs dihedral joints until panels joined Vs sq top spar airfoil high point should cemented place time aid retaining proper alignment ribs panels removed plan easier add 3A2 X /g turbulators rear top spar after panels attached together probably good idea add 6 X 42 diagonal braces 3-FUNCTION ACCUETACH ITM O LCD Tachometer w/dual scale capability lOX lOOX Digital Voltmeter or load /56 checking/cycling TX/RX battery combos ACCU-1Clfl quick @ chargug operation 79 prepaid Nor money order Calif add 6% tax 94086 AVIONI NCSunnyva CA May 1984 171 LEOS LASER *JR STICK World Aerobatic Champion Ideal Trainer Top Quality Epoxy Gloss Pane atstaad,9 lois. & Foam Kt logo Cowl & Wheel Pants ia0 Span Waq Area 1050 .q n iava Laediag Gw Foam Wing90 Span Wing oe Annembly Time Area 1440 sq inches it 5 -12 lb. Balsa Fnsh Ks tagine Si., 75 13 Complete Stop Step In-95 struct ens m th P ctarest7 ght 16 20 lbst$PISHIPPING Lag 2 4 HPDirect Sales Only 9995READYMAR84 PLUS $1 SHIPPINGCap 20 & Cap 21 DirectSales Onifor 60- 12 engines facturers Quality Kits Large Scale Engines RO Un iv Canton OH 44707 Phone 216 4846810 484-4374 Tired Being Shot Down SUPER SERVO GARD Controls Throttle Cant * Constantly monitors receiver interference another trans mitter outside sources instantly reducing throttle idle until interference clears * Constantly monitors flight battery pack voltage instantly reduces throttle idle allowing time safely land * Responds instantly lose radio signal throttling back idle alerting flight problem * Affects throttle giving complete control other servos safe landing * Minimizes crash damage caused signal loss ending full force smash-ups Endorsed IMAAShew Team required shew nsodoi ii v1 SPECIFICATIONS Size KPS 1411 Servo Case Power 17 ma Volt CutOut Point 46 volts Pulse Width Range Adi 0628 milliseconds Systems 3 4 wire Temp Range 00 1400F Weight 12 oz Price $4795 Postpaid Specify connecter type posItIve er negatIve pulse ordering RaFa Enterprises 106 N Main St. Arlington OH 45814 419 365-5066 have large selection wing cores available stock Custom foam cutting reasonable prices Foam blocks nichrome wire special needs Wire $40025 feet 2040 60 size floats $1295 Months Special Sweet Stick AND Sweet Lo Stick Wings Only $900 Information Prices Contact Bee. Slit Aeremollel Eg neetq 21 Joe. Drive West Wwwick RI 02893 call 4011 525-68 3 P ease add $3 sh p Er Hand Foam its flest Deal flest THE NEWEST MOTOR FROM Fox AMERICAS LARGEST INDEPENDENT MANUFACTURER OF MODEL AIRPLANE PRODUCTS pox io BB Bore 650 Stroke600 Displacement199 RPM 84 prop . 17000 Weight81/4 OZ Fuel Consumption 4 oz mm Schneurle porting course rugged parts lots power good idle unique design feature upper cylinder casting can turned exhaust either side back rear exhaust installations Structurally Pox i9BB peer crankshaft made aircraft quality 8620 steel supported two 11mm ball bearings con rod bushed piston fully machined mehanite runs leaded steel liner 22000 Fox 19BBRC$5995 90219 Tiltdown Muffler1495 90220 Tiltup Muffler1495 50203 Motor Mount800 Fox MFG CO 5305 TOWOON AVEFORT SMITH ARK 72901 15011 646-1656 panel secured flat workbench aid preventing inherent warpage panels leave plans diagonals should omitted airfoil quite thin internal bracing necessary anti-warp considerations permanent assembly four indi vidual wing panels other same other wing Make sure mating ends properly beveled panel properly aligned plan view along respective 4-in polyhedral 1-in dihedral being incorporated Add A2 ply joint braces proper gussets indicated After constructing wing will find stab construction much same plans quite self-explanatory Both wing stab should sanded prepared covering favorite covering materialpreferably good tensile strength original model covered silkspan appropriately doped Randolph butyrate com bination gave great strength thin airfoil However found silkspan gradually absorbed fuel causing models weight slowly increase subsequent models have switched Coverites lightweight white Micafilm can claim excellent re sults materialboth its fuel proof skin stress properties Fuselage Parallel-sided profile-type fuse lages certainly very original nor fat balsa box alternatives Nit Wit incorporates interesting combination narrow tapering balsa box engine mount cheeks make rather pleasing silhouette both side plan views selection 3A2 balsa sheet fuselage top important should firm C-grain stock will become back bone fuselage pylon attached fuselage built upside down over plans rectangular-shaped /16 sheet formers cemented place loca tions shown /e sheet sides sembled next sure add /2-in tri angular balsa blocks four inside corners forward compartment before Ae sheet bottom attached /4-in sheet balsa cheeks can added after box Matched Performance System TOP PERFORMANCE K&B ENGINES Airplane 4 Marine K&B FUELS$&B GLOW PLUGS 7 Blends4 choices Matched Finish System BEST APPEARANCE K&B FIBERGLASS CLOTH K&B Micro-Balloons FILLER K&B SUPER POSY RESIN K&B SUPER POSY THINNER K&B SUPER POSY PRIMERI&B SUPER POSY PAINT K&R MIXING CUPS removed plans should pre-beveled before assembly ease carving have small homemade 9-in disc sander powered old washing machine motor ideal types oper ations also ideal facing off front fuselage prior adding 3A2 ply wood firewall laminates can ep oxied place after drilling mounting holes installation blind nuts retain engine mount mount attached front end fuselage carved sanded desired shape groove bent 3A2 piano wire skid can carved front firewall appropriate router held Dremel Moto Tool vertical fin added next ce mented together over plans four separate pieces /e sheet balsa lower skid portion being selected hard stock basswood would also okay skid portion After fin attached fuselage Vie sheet doubler Vie ply stab mount added entire assembly ready finish sanding point engine mount skid fuel timer should temporarily assembled along completed stab approxi mately locate all-important CG longitudinal point should marked sides fuselage box fuse lage laid its side over plans check fore aft relationship balance point marked pylon detail Should resultant balance point align itself such front edge yet-to-be-fabricated pylon would protrude forward fire wall leading edge pylon can angled rearward its base modified per plans trapezoidal pylon keel built over plans proper allowances necessary adjustment leading edge just stated left side contour parts PA PB slanting vertical 3A2 X Vie 2 sq strips can cemented place keel secured over plans right side parts may added after assembly removed plans After finishsanding pylon framework symmetri cal shape planked Vie balsa sheet grain running parallel slanted uprights Following proper trimming 172 Model Aviation HIGu QUALITY FOAM WING CORES AND CUSTOM FOAM CUTTING finish-sanding 3A2 sheet wing platform securely cemented top pylon left now determine exact CO location parts accesso ries assembled proper position pylon permanently cemented top fuselage box have often asked have ever pylon separate fuselage using method can say have used built-up pylon feature its simple direct cement attachment method about 12 years have yet have failure course attachment should made either epoxy cya noacrylate such Super T cellulose cement might too reliable application cover fuselages colored tissue silkspan using nitrate dope After few coats dope fog thin coat clear K&B Super Poxy usually will add heav ier color coating Super Poxy around engine pylon areas ward off fuel prob lems well add bit contrasting color model other accessories pretty much self-explanatory experienced modelers will incorporate own pet tachments anyway An auto-rudder corporated prototype model feature omitted subsequent deemed unnecessary model seems have plenty speed termina tion engine run coast flat right-right glide pattern aid automatic fin-kicker completely finished Nit Wit should thoroughly checked warps proper alignment am firm believer ample pre-flight preparations prevent first flight washout possibility stab should perfectly flat free warps Both wing tips should washed-out about A6 no 3A2 left inner panel should flat right inner panel should incorporate about A6 3Az washin situations can easily attained over steamy teakettle check results repeatedly few days guarantee permanent settings rudder should warped no about 2 right compensate right wing washin engine should mounted about /2 degree left sidethrust Run engine number times en sure initial timer setting about 3 sec doesnt sound like much model will get away quickly after launch initial test hop made prop frontwards engine leaned out am firm advocate vertical launch theory assumes model trimmed no drastic warps kind launched vertically almost model will travel directly away ground should have tendency little out trim will take time 3 sec turn around come back least hard ground moves much further away faster rate vertical launch old ignition-era low angle-of-attack-type launches used years An other argument since ultimate launch angle will about 800 ground way waste time submit backward-mounted broken props beginning near-horizontal low power trimming procedure gradually moving up eventual contest launch mode can just point model straight up engine screaming 3-sec test hop get scary agony over hurry certainly sounds simple anyway doesnt Speaking agony point shall volunteer relieve further claims testimonials contest potential Nit Wit design has enjoy able hope may find just enjoyable well See downwind Electrics/Kopski Continued oaoe 82 prop unloads flight motor cur rent decreases perhaps 10-15% cooling air flows motor battery youve applied what youve read series Most importantly power infor mation given directly applicable various rules thumb given previously Basically two limitations recognize determining quit pushing some motor current limi May1984 173 HobbypoxySt selei colors tallics h finishing flat can spray productstthobby close Whether model wood metal fiberglass plastic combina tion whether flies sails rolls Hobbypoxy formulated let paint build repair pamper perfection HOBBYPOXY PRODUCTS division Pettit Paint Company Inc 10 Pine Street Box 378 Rockaway NJ 07866-0378 IC1 big FREE offer Send complete literature howto-guide well tell qualify time get acquainted offer $475 worth Hobbypoxy products abso lutely FREE
Edition: Model Aviation - 1984/05
Page Numbers: 74, 75, 76, 78, 171, 172, 173
Occupying seat honor late-model version wing stab covering lightweight Coverite Micafilm Black lettering wing inexpensive stick-on vinyl found stationery department large drugstores like Its state art model Category Ill sites ACTIVE FF GAS enthusiasts reside east Mississippi River certainly aware seemingly endless struggle recent years obtain retain suitable fly ing sites competitions Large sites have become extinct currently available much closer small field variety Some years ago AMA Contest Board recognized need tailor Free Flight competitions according size flying field Categories II LII re sulted special engine run flight time limits separate National Rec ord tally kept three cate gones Whether intended action cer tainly instilled renewed vigor throughout Free Flight community opportunity win contest set national record same time small-field situation provided basis additional incentive enthusiasm three-category system gave small-site contestant chance make record books againa feat become increasingly difficult smaller sites east Big Muddy Smallfield competitors able convert assumed handicap definite challenge Category III contests eventually sumed character own case point am familiar succession contests WrightPatterson AFE Dayton OH following 1976 AMA Nats affair opened previously-unavailable old Wright Field area clubs weekend competitions given days little wind drift site could sustain Category II activity However since high fences enclose historic air base virtually unscaleable four area FF clubs sponsored meets chose 2-mm Category III limits long series contest providing steady diet 5-sec engine run 2-mm max limitson superb flying site four different area clubs sponsoring contests same field near monthly basis rather simple task track progress contestants attacking 5-sec 2-mm challenge time couple flying seasons passed W-P contestants beginning get good grip 5 2 limits unusual endure marathon run ning double digits flyoff flights determine winner course model design engine combinations taking interesting trend Simply adding power existing models such Schnuerle-ported engines necessarily ultimate answer Total model weight deemed important factor attempting squeeze 2 mm flight time out 5-sec engine run Schnuerles although quite powerful also quite heavy spring 1979 lightweight models built around lightweight engines ginning show considerable promise Two initial success stories Gib Robbins superlight rear-finned 320 sq Satellite powered Cox TD 09 Gil Morris early Toothpicks series using light weight Fox engines Gibs model parThe inception several years ago FF Power model rules smaller fields 5-sec engine run 2-mm max required some new thinking avoid being also-ran model Class B has shown its worth under conditionsE Harry Murphy 74 Model Aviation inimitable tongue-In-cheek way Harry Mur phy says Note arrow pointing directly real Nit Wit i great model designer/f puts together witty CIA former newsletter plc Joe Guyias shot Wright Fieid ticularly significant first con sistent lightweight combination begin edging previously-dominant FAI Power entries out Class trophy lines culminated winning Class 1979 Lincoln Nats Category III contest effort curb marathon flyoff situation 1980 rules changed trim Category III flyoff engine run 4 sec after fifth max change eliminated FAI Power model con tention found too heavy glide 2 mm 4-sec engine run 1980 Nats W-P proved Wright Field regulars up task fact first-place trophies Power events taken back across Mis sissippi Ralph Prey years has voiced opin ion have use super-hot engine ensure competitive engine/model combo has often stated building proper model around engine regardless its comparative power can produce very satisfactory results philosophy cer tainly applicable successful presentday Category III models Surrendering old adage cant beat emjoin em Nit Wit came about during spring 1980 completed just time 1980 Day ton Nats intention create smaller-than-normal model would speedy enough reach same altitude 4 sec previous years bigger model reached 5 sec single second may appear very significant 20% right off top power pattern small model would also require very light weight engine total model weight kept minimum would advantageous simply build smaller model total weight also re duced altitude attained power burst could sustained glide remaining 116 sec can very long time glide model leaves something desired After weighing Class en gines lightest far old Cox TD 15 4'4 oz selected first Nit Wit combo its optimistic pilot went 1980 Nats hoping capture marbles Class first three official flights produced three maxes trotted downwind retrieve model third max feeling pretty good about new design However model dethermalized onto rear bumper parked van knocking off engine front fuselage Since insufficient time make appropriate re pairs hurriedly put Cox TD 051 same Lunar-Tic 240 won event previous dayand eventually chugged fourth place spectacular beginning con vinced design would provide lot enjoyment future sure joy fly Since old Cox bit cranky occasion some engine parts difficult obtain stepped up Super tigre G 15 repaired fuselage dur ing following winter power plant switch cost over ounce weight pen alty power increase con siderable First flights using variety 7-4 wood fiberglass props indicated design could really handle excessive power subsequent flights made ST G15/19 special Doc Anderson ST G 15/23 23 piston cylinder crammed GLS crankcase Once trimmed desired power groove design appeared very forgiving changes engine prototype Class model proving excellent test bed subsequent models same size possible scaled-up versions larger FF Power classes After repairing original Nit Wit also crash-built larger version dubbed Dim-Wit prior 1982 Nats fortunate win Class D Lincoln also Category III affair model created same thoughts mind size weight kept minimum Dim Wit 535 sq model weigh ing 26 oz sporting OS Chamberlain 42 can certainly raise few eyebrows faces friendly competitors can state Class D entry weighs 26 ounces particular lightweight engine brainJim Waistons camera caught Nit Wit split second after launch Jim ribs Harry about basketball launchsays looks Harry practicing set shot ship moves child fellow CIA Club member Mere dith Chamberlain first take ad vantage discovery bore current OS Max 40 bit larger bore previous OS Max-H mod els Should mix up parts can produce very reputable engine teresting displacement 42 cu article supposed centered Class design purpose mentioning parallel point out superlight engine/model theory appears work well other clsses Category III com petition well Also incorporation awesome power Schnuerle engine isnt absolutely necessary Anyway think small guysand think lightweight engines well airframes have made large issue select ing lightweight engine maybe would help list some readily avail able engines approximate weights aid eventual engine selection Class OS Max 15 CoxTD 15 OS Max 20 Rossi 15 Fox 19 ST GiS ST G15/19 Class B OS Max 25 ST G20/23 some engines can readily mounted radially could eliminate mount altogether save another ounce up-front weightsomething may wish consider arriving eventual choice Construction Ideally completed model should balance desired CG location addition extra weight either end fuselage achieve recommended wing stabilizer completely finished before work fuselage progresses very far will per mit continual checking CG up final permanent attachment wing pylon atop fuselage box wing pylon final item fabricated Nit Wit particularly difficult model construct begin ners model shall assume may interested details its construction also beginners fore shall attempt refrain taxing integrity experienced modelers supeffluous explanation pins placed Also least cyanoacrylate vendors suggests construction methods pins am pin man myself certainly wish accused being old fashioned recognizing progress apparent Wing stab very difficult start explaining construction wing panel Ounces Grams beginning immortal 415118words Pin leading edge plans 425120Anyway whatever pet procedurebe 55156it pins 3M poster cement concrete 55156blockthe LE notched TE 56158inner wing panels have properly lo 56158cated plans fastened securely 56158place TE wing tip panels simply 55156standard 3A6 X /s tapered stock 58165front edges cut away diagonal resulting natural taper thickness wing tip Continued page 171 Note plan suggests commercial engine mount incorporated However Left no-nonsense rear end shows auto-rudder dethermalizer setup well famous logo Central Indiana Aeromodelers Actually author doesnt currently use auto-rudder function Right business end prototype model sports Supertigre G15 aluminum Tatone mount timer really modified K-Mart camera timer behind AA Tatone flood-off faceplate additional trigger mechanism auto-rudder later deemed unnecessary Note T-fitting flood-off line top engine intake shoots enough fuel intake stop engine dumps rest fuel away model 76 Model Aviation Theres OS Max 25 plain-bearing engine front end photograph Although about 65% larger displacement usual Supertigre GiS power plant model actually couple grams lighter goes show versatility possible considering lightweight engines smaller-than-normal competition FF Power models U THIS INSTALLMENT ON planes fly ing will attempt present something has missing up now much power goes what motor prop bat tery combine suitable model installment will brings series together long promised taken previous parts should assured first-time continuing Electric successwith under standing Thats what call Electric Elation time let repeat something said beginning often difficult impossible have first-hand familiarity everything means best ne picture anove ny uus urumer ana tne smaller below Dy Hera Durks Show parts ot slight line recent electric Fly events put Keystone RC Club large variety highly successful Electrics speaks well form power Only sounds fun audible lettering must still legible soft brush remove eraser residue nice have simply have have good pencil sharpener handy times should using fairly soft pencil about No 2 lead order get lines dark enough reproduction blueprint machine soft pencils should resharpened after few lines Mechanical drafting pencils extendable leads reasonably inexpensive much easier sharpen wooden counterparts last impor tant item good source light either natural artificial Now youve got paper taped drawing board light ruler hand freshly sharpened pencil other Now what First put down pencil put down ruler Before draw have determine two important prerequisites well-drawn nicelyexecuted design what going draw going draw suggest before attempt put design paper graphic form first have paper mathematicallyrepresented form Ive included column copy standard New Design Data Sheet sheet have included parameters feel important either affecting performance com pleted aircraft and/or necessary trans lating numbers construction plan significance parame ters insofar aircraft performance con cerned want deal strictly necessary making drawing now Start wing minimum will have have determined desired span area length root tip chords flap size specifications airfoil terms thick location high point both tip root An additional parameter data sheethut should beis leading edge radius LER Simply put LER circle drawn leading edge airfoil determines relative sharpness bluntness airfoil Lastly should determine planform shape wing ie straight-taper elliptical constant-chord swept forward back etc helpful hint straight-tapered wings straight flap hinge lines easiest build fly best mans opinion whos Now repeat above measurements stab elevator Span area pro portion total area primary concerns Tail thickness still subject jury out personal feel ings have changed preferring rather thick tails belief should thin possible given need structural rigidity Since primary function fuselage simply hold engine keep wing tail proper relationship other few numbers significant long nose going will put wing will put tail Again feel great deal significance what numbers articles purposes Ill leave own opinions save another time Suffice say will have decide parameters before can commit paper Now have good idea what airplane will look like aerodynamically can go back drawing board trans late numbers picture airplane concluded next month Photos comments news about Stunt should addressed Ted Fan cher 158 Flying Cloud Isle Foster City CA 94409 Nit Wit/Murphy Continued oaoe 76 itself bottom spars secured posi tion next ribs turn ce mented securely place locations shown Obviously hold off putting ribs dihedral joints until panels joined Vs sq top spar airfoil high point should cemented place time aid retaining proper alignment ribs panels removed plan easier add 3A2 X /g turbulators rear top spar after panels attached together probably good idea add 6 X 42 diagonal braces 3-FUNCTION ACCUETACH ITM O LCD Tachometer w/dual scale capability lOX lOOX Digital Voltmeter or load /56 checking/cycling TX/RX battery combos ACCU-1Clfl quick @ chargug operation 79 prepaid Nor money order Calif add 6% tax 94086 AVIONI NCSunnyva CA May 1984 171 LEOS LASER *JR STICK World Aerobatic Champion Ideal Trainer Top Quality Epoxy Gloss Pane atstaad,9 lois. & Foam Kt logo Cowl & Wheel Pants ia0 Span Waq Area 1050 .q n iava Laediag Gw Foam Wing90 Span Wing oe Annembly Time Area 1440 sq inches it 5 -12 lb. Balsa Fnsh Ks tagine Si., 75 13 Complete Stop Step In-95 struct ens m th P ctarest7 ght 16 20 lbst$PISHIPPING Lag 2 4 HPDirect Sales Only 9995READYMAR84 PLUS $1 SHIPPINGCap 20 & Cap 21 DirectSales Onifor 60- 12 engines facturers Quality Kits Large Scale Engines RO Un iv Canton OH 44707 Phone 216 4846810 484-4374 Tired Being Shot Down SUPER SERVO GARD Controls Throttle Cant * Constantly monitors receiver interference another trans mitter outside sources instantly reducing throttle idle until interference clears * Constantly monitors flight battery pack voltage instantly reduces throttle idle allowing time safely land * Responds instantly lose radio signal throttling back idle alerting flight problem * Affects throttle giving complete control other servos safe landing * Minimizes crash damage caused signal loss ending full force smash-ups Endorsed IMAAShew Team required shew nsodoi ii v1 SPECIFICATIONS Size KPS 1411 Servo Case Power 17 ma Volt CutOut Point 46 volts Pulse Width Range Adi 0628 milliseconds Systems 3 4 wire Temp Range 00 1400F Weight 12 oz Price $4795 Postpaid Specify connecter type posItIve er negatIve pulse ordering RaFa Enterprises 106 N Main St. Arlington OH 45814 419 365-5066 have large selection wing cores available stock Custom foam cutting reasonable prices Foam blocks nichrome wire special needs Wire $40025 feet 2040 60 size floats $1295 Months Special Sweet Stick AND Sweet Lo Stick Wings Only $900 Information Prices Contact Bee. Slit Aeremollel Eg neetq 21 Joe. Drive West Wwwick RI 02893 call 4011 525-68 3 P ease add $3 sh p Er Hand Foam its flest Deal flest THE NEWEST MOTOR FROM Fox AMERICAS LARGEST INDEPENDENT MANUFACTURER OF MODEL AIRPLANE PRODUCTS pox io BB Bore 650 Stroke600 Displacement199 RPM 84 prop . 17000 Weight81/4 OZ Fuel Consumption 4 oz mm Schneurle porting course rugged parts lots power good idle unique design feature upper cylinder casting can turned exhaust either side back rear exhaust installations Structurally Pox i9BB peer crankshaft made aircraft quality 8620 steel supported two 11mm ball bearings con rod bushed piston fully machined mehanite runs leaded steel liner 22000 Fox 19BBRC$5995 90219 Tiltdown Muffler1495 90220 Tiltup Muffler1495 50203 Motor Mount800 Fox MFG CO 5305 TOWOON AVEFORT SMITH ARK 72901 15011 646-1656 panel secured flat workbench aid preventing inherent warpage panels leave plans diagonals should omitted airfoil quite thin internal bracing necessary anti-warp considerations permanent assembly four indi vidual wing panels other same other wing Make sure mating ends properly beveled panel properly aligned plan view along respective 4-in polyhedral 1-in dihedral being incorporated Add A2 ply joint braces proper gussets indicated After constructing wing will find stab construction much same plans quite self-explanatory Both wing stab should sanded prepared covering favorite covering materialpreferably good tensile strength original model covered silkspan appropriately doped Randolph butyrate com bination gave great strength thin airfoil However found silkspan gradually absorbed fuel causing models weight slowly increase subsequent models have switched Coverites lightweight white Micafilm can claim excellent re sults materialboth its fuel proof skin stress properties Fuselage Parallel-sided profile-type fuse lages certainly very original nor fat balsa box alternatives Nit Wit incorporates interesting combination narrow tapering balsa box engine mount cheeks make rather pleasing silhouette both side plan views selection 3A2 balsa sheet fuselage top important should firm C-grain stock will become back bone fuselage pylon attached fuselage built upside down over plans rectangular-shaped /16 sheet formers cemented place loca tions shown /e sheet sides sembled next sure add /2-in tri angular balsa blocks four inside corners forward compartment before Ae sheet bottom attached /4-in sheet balsa cheeks can added after box Matched Performance System TOP PERFORMANCE K&B ENGINES Airplane 4 Marine K&B FUELS$&B GLOW PLUGS 7 Blends4 choices Matched Finish System BEST APPEARANCE K&B FIBERGLASS CLOTH K&B Micro-Balloons FILLER K&B SUPER POSY RESIN K&B SUPER POSY THINNER K&B SUPER POSY PRIMERI&B SUPER POSY PAINT K&R MIXING CUPS removed plans should pre-beveled before assembly ease carving have small homemade 9-in disc sander powered old washing machine motor ideal types oper ations also ideal facing off front fuselage prior adding 3A2 ply wood firewall laminates can ep oxied place after drilling mounting holes installation blind nuts retain engine mount mount attached front end fuselage carved sanded desired shape groove bent 3A2 piano wire skid can carved front firewall appropriate router held Dremel Moto Tool vertical fin added next ce mented together over plans four separate pieces /e sheet balsa lower skid portion being selected hard stock basswood would also okay skid portion After fin attached fuselage Vie sheet doubler Vie ply stab mount added entire assembly ready finish sanding point engine mount skid fuel timer should temporarily assembled along completed stab approxi mately locate all-important CG longitudinal point should marked sides fuselage box fuse lage laid its side over plans check fore aft relationship balance point marked pylon detail Should resultant balance point align itself such front edge yet-to-be-fabricated pylon would protrude forward fire wall leading edge pylon can angled rearward its base modified per plans trapezoidal pylon keel built over plans proper allowances necessary adjustment leading edge just stated left side contour parts PA PB slanting vertical 3A2 X Vie 2 sq strips can cemented place keel secured over plans right side parts may added after assembly removed plans After finishsanding pylon framework symmetri cal shape planked Vie balsa sheet grain running parallel slanted uprights Following proper trimming 172 Model Aviation HIGu QUALITY FOAM WING CORES AND CUSTOM FOAM CUTTING finish-sanding 3A2 sheet wing platform securely cemented top pylon left now determine exact CO location parts accesso ries assembled proper position pylon permanently cemented top fuselage box have often asked have ever pylon separate fuselage using method can say have used built-up pylon feature its simple direct cement attachment method about 12 years have yet have failure course attachment should made either epoxy cya noacrylate such Super T cellulose cement might too reliable application cover fuselages colored tissue silkspan using nitrate dope After few coats dope fog thin coat clear K&B Super Poxy usually will add heav ier color coating Super Poxy around engine pylon areas ward off fuel prob lems well add bit contrasting color model other accessories pretty much self-explanatory experienced modelers will incorporate own pet tachments anyway An auto-rudder corporated prototype model feature omitted subsequent deemed unnecessary model seems have plenty speed termina tion engine run coast flat right-right glide pattern aid automatic fin-kicker completely finished Nit Wit should thoroughly checked warps proper alignment am firm believer ample pre-flight preparations prevent first flight washout possibility stab should perfectly flat free warps Both wing tips should washed-out about A6 no 3A2 left inner panel should flat right inner panel should incorporate about A6 3Az washin situations can easily attained over steamy teakettle check results repeatedly few days guarantee permanent settings rudder should warped no about 2 right compensate right wing washin engine should mounted about /2 degree left sidethrust Run engine number times en sure initial timer setting about 3 sec doesnt sound like much model will get away quickly after launch initial test hop made prop frontwards engine leaned out am firm advocate vertical launch theory assumes model trimmed no drastic warps kind launched vertically almost model will travel directly away ground should have tendency little out trim will take time 3 sec turn around come back least hard ground moves much further away faster rate vertical launch old ignition-era low angle-of-attack-type launches used years An other argument since ultimate launch angle will about 800 ground way waste time submit backward-mounted broken props beginning near-horizontal low power trimming procedure gradually moving up eventual contest launch mode can just point model straight up engine screaming 3-sec test hop get scary agony over hurry certainly sounds simple anyway doesnt Speaking agony point shall volunteer relieve further claims testimonials contest potential Nit Wit design has enjoy able hope may find just enjoyable well See downwind Electrics/Kopski Continued oaoe 82 prop unloads flight motor cur rent decreases perhaps 10-15% cooling air flows motor battery youve applied what youve read series Most importantly power infor mation given directly applicable various rules thumb given previously Basically two limitations recognize determining quit pushing some motor current limi May1984 173 HobbypoxySt selei colors tallics h finishing flat can spray productstthobby close Whether model wood metal fiberglass plastic combina tion whether flies sails rolls Hobbypoxy formulated let paint build repair pamper perfection HOBBYPOXY PRODUCTS division Pettit Paint Company Inc 10 Pine Street Box 378 Rockaway NJ 07866-0378 IC1 big FREE offer Send complete literature howto-guide well tell qualify time get acquainted offer $475 worth Hobbypoxy products abso lutely FREE
Edition: Model Aviation - 1984/05
Page Numbers: 74, 75, 76, 78, 171, 172, 173
Occupying seat honor late-model version wing stab covering lightweight Coverite Micafilm Black lettering wing inexpensive stick-on vinyl found stationery department large drugstores like Its state art model Category Ill sites ACTIVE FF GAS enthusiasts reside east Mississippi River certainly aware seemingly endless struggle recent years obtain retain suitable fly ing sites competitions Large sites have become extinct currently available much closer small field variety Some years ago AMA Contest Board recognized need tailor Free Flight competitions according size flying field Categories II LII re sulted special engine run flight time limits separate National Rec ord tally kept three cate gones Whether intended action cer tainly instilled renewed vigor throughout Free Flight community opportunity win contest set national record same time small-field situation provided basis additional incentive enthusiasm three-category system gave small-site contestant chance make record books againa feat become increasingly difficult smaller sites east Big Muddy Smallfield competitors able convert assumed handicap definite challenge Category III contests eventually sumed character own case point am familiar succession contests WrightPatterson AFE Dayton OH following 1976 AMA Nats affair opened previously-unavailable old Wright Field area clubs weekend competitions given days little wind drift site could sustain Category II activity However since high fences enclose historic air base virtually unscaleable four area FF clubs sponsored meets chose 2-mm Category III limits long series contest providing steady diet 5-sec engine run 2-mm max limitson superb flying site four different area clubs sponsoring contests same field near monthly basis rather simple task track progress contestants attacking 5-sec 2-mm challenge time couple flying seasons passed W-P contestants beginning get good grip 5 2 limits unusual endure marathon run ning double digits flyoff flights determine winner course model design engine combinations taking interesting trend Simply adding power existing models such Schnuerle-ported engines necessarily ultimate answer Total model weight deemed important factor attempting squeeze 2 mm flight time out 5-sec engine run Schnuerles although quite powerful also quite heavy spring 1979 lightweight models built around lightweight engines ginning show considerable promise Two initial success stories Gib Robbins superlight rear-finned 320 sq Satellite powered Cox TD 09 Gil Morris early Toothpicks series using light weight Fox engines Gibs model parThe inception several years ago FF Power model rules smaller fields 5-sec engine run 2-mm max required some new thinking avoid being also-ran model Class B has shown its worth under conditionsE Harry Murphy 74 Model Aviation inimitable tongue-In-cheek way Harry Mur phy says Note arrow pointing directly real Nit Wit i great model designer/f puts together witty CIA former newsletter plc Joe Guyias shot Wright Fieid ticularly significant first con sistent lightweight combination begin edging previously-dominant FAI Power entries out Class trophy lines culminated winning Class 1979 Lincoln Nats Category III contest effort curb marathon flyoff situation 1980 rules changed trim Category III flyoff engine run 4 sec after fifth max change eliminated FAI Power model con tention found too heavy glide 2 mm 4-sec engine run 1980 Nats W-P proved Wright Field regulars up task fact first-place trophies Power events taken back across Mis sissippi Ralph Prey years has voiced opin ion have use super-hot engine ensure competitive engine/model combo has often stated building proper model around engine regardless its comparative power can produce very satisfactory results philosophy cer tainly applicable successful presentday Category III models Surrendering old adage cant beat emjoin em Nit Wit came about during spring 1980 completed just time 1980 Day ton Nats intention create smaller-than-normal model would speedy enough reach same altitude 4 sec previous years bigger model reached 5 sec single second may appear very significant 20% right off top power pattern small model would also require very light weight engine total model weight kept minimum would advantageous simply build smaller model total weight also re duced altitude attained power burst could sustained glide remaining 116 sec can very long time glide model leaves something desired After weighing Class en gines lightest far old Cox TD 15 4'4 oz selected first Nit Wit combo its optimistic pilot went 1980 Nats hoping capture marbles Class first three official flights produced three maxes trotted downwind retrieve model third max feeling pretty good about new design However model dethermalized onto rear bumper parked van knocking off engine front fuselage Since insufficient time make appropriate re pairs hurriedly put Cox TD 051 same Lunar-Tic 240 won event previous dayand eventually chugged fourth place spectacular beginning con vinced design would provide lot enjoyment future sure joy fly Since old Cox bit cranky occasion some engine parts difficult obtain stepped up Super tigre G 15 repaired fuselage dur ing following winter power plant switch cost over ounce weight pen alty power increase con siderable First flights using variety 7-4 wood fiberglass props indicated design could really handle excessive power subsequent flights made ST G15/19 special Doc Anderson ST G 15/23 23 piston cylinder crammed GLS crankcase Once trimmed desired power groove design appeared very forgiving changes engine prototype Class model proving excellent test bed subsequent models same size possible scaled-up versions larger FF Power classes After repairing original Nit Wit also crash-built larger version dubbed Dim-Wit prior 1982 Nats fortunate win Class D Lincoln also Category III affair model created same thoughts mind size weight kept minimum Dim Wit 535 sq model weigh ing 26 oz sporting OS Chamberlain 42 can certainly raise few eyebrows faces friendly competitors can state Class D entry weighs 26 ounces particular lightweight engine brainJim Waistons camera caught Nit Wit split second after launch Jim ribs Harry about basketball launchsays looks Harry practicing set shot ship moves child fellow CIA Club member Mere dith Chamberlain first take ad vantage discovery bore current OS Max 40 bit larger bore previous OS Max-H mod els Should mix up parts can produce very reputable engine teresting displacement 42 cu article supposed centered Class design purpose mentioning parallel point out superlight engine/model theory appears work well other clsses Category III com petition well Also incorporation awesome power Schnuerle engine isnt absolutely necessary Anyway think small guysand think lightweight engines well airframes have made large issue select ing lightweight engine maybe would help list some readily avail able engines approximate weights aid eventual engine selection Class OS Max 15 CoxTD 15 OS Max 20 Rossi 15 Fox 19 ST GiS ST G15/19 Class B OS Max 25 ST G20/23 some engines can readily mounted radially could eliminate mount altogether save another ounce up-front weightsomething may wish consider arriving eventual choice Construction Ideally completed model should balance desired CG location addition extra weight either end fuselage achieve recommended wing stabilizer completely finished before work fuselage progresses very far will per mit continual checking CG up final permanent attachment wing pylon atop fuselage box wing pylon final item fabricated Nit Wit particularly difficult model construct begin ners model shall assume may interested details its construction also beginners fore shall attempt refrain taxing integrity experienced modelers supeffluous explanation pins placed Also least cyanoacrylate vendors suggests construction methods pins am pin man myself certainly wish accused being old fashioned recognizing progress apparent Wing stab very difficult start explaining construction wing panel Ounces Grams beginning immortal 415118words Pin leading edge plans 425120Anyway whatever pet procedurebe 55156it pins 3M poster cement concrete 55156blockthe LE notched TE 56158inner wing panels have properly lo 56158cated plans fastened securely 56158place TE wing tip panels simply 55156standard 3A6 X /s tapered stock 58165front edges cut away diagonal resulting natural taper thickness wing tip Continued page 171 Note plan suggests commercial engine mount incorporated However Left no-nonsense rear end shows auto-rudder dethermalizer setup well famous logo Central Indiana Aeromodelers Actually author doesnt currently use auto-rudder function Right business end prototype model sports Supertigre G15 aluminum Tatone mount timer really modified K-Mart camera timer behind AA Tatone flood-off faceplate additional trigger mechanism auto-rudder later deemed unnecessary Note T-fitting flood-off line top engine intake shoots enough fuel intake stop engine dumps rest fuel away model 76 Model Aviation Theres OS Max 25 plain-bearing engine front end photograph Although about 65% larger displacement usual Supertigre GiS power plant model actually couple grams lighter goes show versatility possible considering lightweight engines smaller-than-normal competition FF Power models U THIS INSTALLMENT ON planes fly ing will attempt present something has missing up now much power goes what motor prop bat tery combine suitable model installment will brings series together long promised taken previous parts should assured first-time continuing Electric successwith under standing Thats what call Electric Elation time let repeat something said beginning often difficult impossible have first-hand familiarity everything means best ne picture anove ny uus urumer ana tne smaller below Dy Hera Durks Show parts ot slight line recent electric Fly events put Keystone RC Club large variety highly successful Electrics speaks well form power Only sounds fun audible lettering must still legible soft brush remove eraser residue nice have simply have have good pencil sharpener handy times should using fairly soft pencil about No 2 lead order get lines dark enough reproduction blueprint machine soft pencils should resharpened after few lines Mechanical drafting pencils extendable leads reasonably inexpensive much easier sharpen wooden counterparts last impor tant item good source light either natural artificial Now youve got paper taped drawing board light ruler hand freshly sharpened pencil other Now what First put down pencil put down ruler Before draw have determine two important prerequisites well-drawn nicelyexecuted design what going draw going draw suggest before attempt put design paper graphic form first have paper mathematicallyrepresented form Ive included column copy standard New Design Data Sheet sheet have included parameters feel important either affecting performance com pleted aircraft and/or necessary trans lating numbers construction plan significance parame ters insofar aircraft performance con cerned want deal strictly necessary making drawing now Start wing minimum will have have determined desired span area length root tip chords flap size specifications airfoil terms thick location high point both tip root An additional parameter data sheethut should beis leading edge radius LER Simply put LER circle drawn leading edge airfoil determines relative sharpness bluntness airfoil Lastly should determine planform shape wing ie straight-taper elliptical constant-chord swept forward back etc helpful hint straight-tapered wings straight flap hinge lines easiest build fly best mans opinion whos Now repeat above measurements stab elevator Span area pro portion total area primary concerns Tail thickness still subject jury out personal feel ings have changed preferring rather thick tails belief should thin possible given need structural rigidity Since primary function fuselage simply hold engine keep wing tail proper relationship other few numbers significant long nose going will put wing will put tail Again feel great deal significance what numbers articles purposes Ill leave own opinions save another time Suffice say will have decide parameters before can commit paper Now have good idea what airplane will look like aerodynamically can go back drawing board trans late numbers picture airplane concluded next month Photos comments news about Stunt should addressed Ted Fan cher 158 Flying Cloud Isle Foster City CA 94409 Nit Wit/Murphy Continued oaoe 76 itself bottom spars secured posi tion next ribs turn ce mented securely place locations shown Obviously hold off putting ribs dihedral joints until panels joined Vs sq top spar airfoil high point should cemented place time aid retaining proper alignment ribs panels removed plan easier add 3A2 X /g turbulators rear top spar after panels attached together probably good idea add 6 X 42 diagonal braces 3-FUNCTION ACCUETACH ITM O LCD Tachometer w/dual scale capability lOX lOOX Digital Voltmeter or load /56 checking/cycling TX/RX battery combos ACCU-1Clfl quick @ chargug operation 79 prepaid Nor money order Calif add 6% tax 94086 AVIONI NCSunnyva CA May 1984 171 LEOS LASER *JR STICK World Aerobatic Champion Ideal Trainer Top Quality Epoxy Gloss Pane atstaad,9 lois. & Foam Kt logo Cowl & Wheel Pants ia0 Span Waq Area 1050 .q n iava Laediag Gw Foam Wing90 Span Wing oe Annembly Time Area 1440 sq inches it 5 -12 lb. Balsa Fnsh Ks tagine Si., 75 13 Complete Stop Step In-95 struct ens m th P ctarest7 ght 16 20 lbst$PISHIPPING Lag 2 4 HPDirect Sales Only 9995READYMAR84 PLUS $1 SHIPPINGCap 20 & Cap 21 DirectSales Onifor 60- 12 engines facturers Quality Kits Large Scale Engines RO Un iv Canton OH 44707 Phone 216 4846810 484-4374 Tired Being Shot Down SUPER SERVO GARD Controls Throttle Cant * Constantly monitors receiver interference another trans mitter outside sources instantly reducing throttle idle until interference clears * Constantly monitors flight battery pack voltage instantly reduces throttle idle allowing time safely land * Responds instantly lose radio signal throttling back idle alerting flight problem * Affects throttle giving complete control other servos safe landing * Minimizes crash damage caused signal loss ending full force smash-ups Endorsed IMAAShew Team required shew nsodoi ii v1 SPECIFICATIONS Size KPS 1411 Servo Case Power 17 ma Volt CutOut Point 46 volts Pulse Width Range Adi 0628 milliseconds Systems 3 4 wire Temp Range 00 1400F Weight 12 oz Price $4795 Postpaid Specify connecter type posItIve er negatIve pulse ordering RaFa Enterprises 106 N Main St. Arlington OH 45814 419 365-5066 have large selection wing cores available stock Custom foam cutting reasonable prices Foam blocks nichrome wire special needs Wire $40025 feet 2040 60 size floats $1295 Months Special Sweet Stick AND Sweet Lo Stick Wings Only $900 Information Prices Contact Bee. Slit Aeremollel Eg neetq 21 Joe. Drive West Wwwick RI 02893 call 4011 525-68 3 P ease add $3 sh p Er Hand Foam its flest Deal flest THE NEWEST MOTOR FROM Fox AMERICAS LARGEST INDEPENDENT MANUFACTURER OF MODEL AIRPLANE PRODUCTS pox io BB Bore 650 Stroke600 Displacement199 RPM 84 prop . 17000 Weight81/4 OZ Fuel Consumption 4 oz mm Schneurle porting course rugged parts lots power good idle unique design feature upper cylinder casting can turned exhaust either side back rear exhaust installations Structurally Pox i9BB peer crankshaft made aircraft quality 8620 steel supported two 11mm ball bearings con rod bushed piston fully machined mehanite runs leaded steel liner 22000 Fox 19BBRC$5995 90219 Tiltdown Muffler1495 90220 Tiltup Muffler1495 50203 Motor Mount800 Fox MFG CO 5305 TOWOON AVEFORT SMITH ARK 72901 15011 646-1656 panel secured flat workbench aid preventing inherent warpage panels leave plans diagonals should omitted airfoil quite thin internal bracing necessary anti-warp considerations permanent assembly four indi vidual wing panels other same other wing Make sure mating ends properly beveled panel properly aligned plan view along respective 4-in polyhedral 1-in dihedral being incorporated Add A2 ply joint braces proper gussets indicated After constructing wing will find stab construction much same plans quite self-explanatory Both wing stab should sanded prepared covering favorite covering materialpreferably good tensile strength original model covered silkspan appropriately doped Randolph butyrate com bination gave great strength thin airfoil However found silkspan gradually absorbed fuel causing models weight slowly increase subsequent models have switched Coverites lightweight white Micafilm can claim excellent re sults materialboth its fuel proof skin stress properties Fuselage Parallel-sided profile-type fuse lages certainly very original nor fat balsa box alternatives Nit Wit incorporates interesting combination narrow tapering balsa box engine mount cheeks make rather pleasing silhouette both side plan views selection 3A2 balsa sheet fuselage top important should firm C-grain stock will become back bone fuselage pylon attached fuselage built upside down over plans rectangular-shaped /16 sheet formers cemented place loca tions shown /e sheet sides sembled next sure add /2-in tri angular balsa blocks four inside corners forward compartment before Ae sheet bottom attached /4-in sheet balsa cheeks can added after box Matched Performance System TOP PERFORMANCE K&B ENGINES Airplane 4 Marine K&B FUELS$&B GLOW PLUGS 7 Blends4 choices Matched Finish System BEST APPEARANCE K&B FIBERGLASS CLOTH K&B Micro-Balloons FILLER K&B SUPER POSY RESIN K&B SUPER POSY THINNER K&B SUPER POSY PRIMERI&B SUPER POSY PAINT K&R MIXING CUPS removed plans should pre-beveled before assembly ease carving have small homemade 9-in disc sander powered old washing machine motor ideal types oper ations also ideal facing off front fuselage prior adding 3A2 ply wood firewall laminates can ep oxied place after drilling mounting holes installation blind nuts retain engine mount mount attached front end fuselage carved sanded desired shape groove bent 3A2 piano wire skid can carved front firewall appropriate router held Dremel Moto Tool vertical fin added next ce mented together over plans four separate pieces /e sheet balsa lower skid portion being selected hard stock basswood would also okay skid portion After fin attached fuselage Vie sheet doubler Vie ply stab mount added entire assembly ready finish sanding point engine mount skid fuel timer should temporarily assembled along completed stab approxi mately locate all-important CG longitudinal point should marked sides fuselage box fuse lage laid its side over plans check fore aft relationship balance point marked pylon detail Should resultant balance point align itself such front edge yet-to-be-fabricated pylon would protrude forward fire wall leading edge pylon can angled rearward its base modified per plans trapezoidal pylon keel built over plans proper allowances necessary adjustment leading edge just stated left side contour parts PA PB slanting vertical 3A2 X Vie 2 sq strips can cemented place keel secured over plans right side parts may added after assembly removed plans After finishsanding pylon framework symmetri cal shape planked Vie balsa sheet grain running parallel slanted uprights Following proper trimming 172 Model Aviation HIGu QUALITY FOAM WING CORES AND CUSTOM FOAM CUTTING finish-sanding 3A2 sheet wing platform securely cemented top pylon left now determine exact CO location parts accesso ries assembled proper position pylon permanently cemented top fuselage box have often asked have ever pylon separate fuselage using method can say have used built-up pylon feature its simple direct cement attachment method about 12 years have yet have failure course attachment should made either epoxy cya noacrylate such Super T cellulose cement might too reliable application cover fuselages colored tissue silkspan using nitrate dope After few coats dope fog thin coat clear K&B Super Poxy usually will add heav ier color coating Super Poxy around engine pylon areas ward off fuel prob lems well add bit contrasting color model other accessories pretty much self-explanatory experienced modelers will incorporate own pet tachments anyway An auto-rudder corporated prototype model feature omitted subsequent deemed unnecessary model seems have plenty speed termina tion engine run coast flat right-right glide pattern aid automatic fin-kicker completely finished Nit Wit should thoroughly checked warps proper alignment am firm believer ample pre-flight preparations prevent first flight washout possibility stab should perfectly flat free warps Both wing tips should washed-out about A6 no 3A2 left inner panel should flat right inner panel should incorporate about A6 3Az washin situations can easily attained over steamy teakettle check results repeatedly few days guarantee permanent settings rudder should warped no about 2 right compensate right wing washin engine should mounted about /2 degree left sidethrust Run engine number times en sure initial timer setting about 3 sec doesnt sound like much model will get away quickly after launch initial test hop made prop frontwards engine leaned out am firm advocate vertical launch theory assumes model trimmed no drastic warps kind launched vertically almost model will travel directly away ground should have tendency little out trim will take time 3 sec turn around come back least hard ground moves much further away faster rate vertical launch old ignition-era low angle-of-attack-type launches used years An other argument since ultimate launch angle will about 800 ground way waste time submit backward-mounted broken props beginning near-horizontal low power trimming procedure gradually moving up eventual contest launch mode can just point model straight up engine screaming 3-sec test hop get scary agony over hurry certainly sounds simple anyway doesnt Speaking agony point shall volunteer relieve further claims testimonials contest potential Nit Wit design has enjoy able hope may find just enjoyable well See downwind Electrics/Kopski Continued oaoe 82 prop unloads flight motor cur rent decreases perhaps 10-15% cooling air flows motor battery youve applied what youve read series Most importantly power infor mation given directly applicable various rules thumb given previously Basically two limitations recognize determining quit pushing some motor current limi May1984 173 HobbypoxySt selei colors tallics h finishing flat can spray productstthobby close Whether model wood metal fiberglass plastic combina tion whether flies sails rolls Hobbypoxy formulated let paint build repair pamper perfection HOBBYPOXY PRODUCTS division Pettit Paint Company Inc 10 Pine Street Box 378 Rockaway NJ 07866-0378 IC1 big FREE offer Send complete literature howto-guide well tell qualify time get acquainted offer $475 worth Hobbypoxy products abso lutely FREE
Edition: Model Aviation - 1984/05
Page Numbers: 74, 75, 76, 78, 171, 172, 173
Occupying seat honor late-model version wing stab covering lightweight Coverite Micafilm Black lettering wing inexpensive stick-on vinyl found stationery department large drugstores like Its state art model Category Ill sites ACTIVE FF GAS enthusiasts reside east Mississippi River certainly aware seemingly endless struggle recent years obtain retain suitable fly ing sites competitions Large sites have become extinct currently available much closer small field variety Some years ago AMA Contest Board recognized need tailor Free Flight competitions according size flying field Categories II LII re sulted special engine run flight time limits separate National Rec ord tally kept three cate gones Whether intended action cer tainly instilled renewed vigor throughout Free Flight community opportunity win contest set national record same time small-field situation provided basis additional incentive enthusiasm three-category system gave small-site contestant chance make record books againa feat become increasingly difficult smaller sites east Big Muddy Smallfield competitors able convert assumed handicap definite challenge Category III contests eventually sumed character own case point am familiar succession contests WrightPatterson AFE Dayton OH following 1976 AMA Nats affair opened previously-unavailable old Wright Field area clubs weekend competitions given days little wind drift site could sustain Category II activity However since high fences enclose historic air base virtually unscaleable four area FF clubs sponsored meets chose 2-mm Category III limits long series contest providing steady diet 5-sec engine run 2-mm max limitson superb flying site four different area clubs sponsoring contests same field near monthly basis rather simple task track progress contestants attacking 5-sec 2-mm challenge time couple flying seasons passed W-P contestants beginning get good grip 5 2 limits unusual endure marathon run ning double digits flyoff flights determine winner course model design engine combinations taking interesting trend Simply adding power existing models such Schnuerle-ported engines necessarily ultimate answer Total model weight deemed important factor attempting squeeze 2 mm flight time out 5-sec engine run Schnuerles although quite powerful also quite heavy spring 1979 lightweight models built around lightweight engines ginning show considerable promise Two initial success stories Gib Robbins superlight rear-finned 320 sq Satellite powered Cox TD 09 Gil Morris early Toothpicks series using light weight Fox engines Gibs model parThe inception several years ago FF Power model rules smaller fields 5-sec engine run 2-mm max required some new thinking avoid being also-ran model Class B has shown its worth under conditionsE Harry Murphy 74 Model Aviation inimitable tongue-In-cheek way Harry Mur phy says Note arrow pointing directly real Nit Wit i great model designer/f puts together witty CIA former newsletter plc Joe Guyias shot Wright Fieid ticularly significant first con sistent lightweight combination begin edging previously-dominant FAI Power entries out Class trophy lines culminated winning Class 1979 Lincoln Nats Category III contest effort curb marathon flyoff situation 1980 rules changed trim Category III flyoff engine run 4 sec after fifth max change eliminated FAI Power model con tention found too heavy glide 2 mm 4-sec engine run 1980 Nats W-P proved Wright Field regulars up task fact first-place trophies Power events taken back across Mis sissippi Ralph Prey years has voiced opin ion have use super-hot engine ensure competitive engine/model combo has often stated building proper model around engine regardless its comparative power can produce very satisfactory results philosophy cer tainly applicable successful presentday Category III models Surrendering old adage cant beat emjoin em Nit Wit came about during spring 1980 completed just time 1980 Day ton Nats intention create smaller-than-normal model would speedy enough reach same altitude 4 sec previous years bigger model reached 5 sec single second may appear very significant 20% right off top power pattern small model would also require very light weight engine total model weight kept minimum would advantageous simply build smaller model total weight also re duced altitude attained power burst could sustained glide remaining 116 sec can very long time glide model leaves something desired After weighing Class en gines lightest far old Cox TD 15 4'4 oz selected first Nit Wit combo its optimistic pilot went 1980 Nats hoping capture marbles Class first three official flights produced three maxes trotted downwind retrieve model third max feeling pretty good about new design However model dethermalized onto rear bumper parked van knocking off engine front fuselage Since insufficient time make appropriate re pairs hurriedly put Cox TD 051 same Lunar-Tic 240 won event previous dayand eventually chugged fourth place spectacular beginning con vinced design would provide lot enjoyment future sure joy fly Since old Cox bit cranky occasion some engine parts difficult obtain stepped up Super tigre G 15 repaired fuselage dur ing following winter power plant switch cost over ounce weight pen alty power increase con siderable First flights using variety 7-4 wood fiberglass props indicated design could really handle excessive power subsequent flights made ST G15/19 special Doc Anderson ST G 15/23 23 piston cylinder crammed GLS crankcase Once trimmed desired power groove design appeared very forgiving changes engine prototype Class model proving excellent test bed subsequent models same size possible scaled-up versions larger FF Power classes After repairing original Nit Wit also crash-built larger version dubbed Dim-Wit prior 1982 Nats fortunate win Class D Lincoln also Category III affair model created same thoughts mind size weight kept minimum Dim Wit 535 sq model weigh ing 26 oz sporting OS Chamberlain 42 can certainly raise few eyebrows faces friendly competitors can state Class D entry weighs 26 ounces particular lightweight engine brainJim Waistons camera caught Nit Wit split second after launch Jim ribs Harry about basketball launchsays looks Harry practicing set shot ship moves child fellow CIA Club member Mere dith Chamberlain first take ad vantage discovery bore current OS Max 40 bit larger bore previous OS Max-H mod els Should mix up parts can produce very reputable engine teresting displacement 42 cu article supposed centered Class design purpose mentioning parallel point out superlight engine/model theory appears work well other clsses Category III com petition well Also incorporation awesome power Schnuerle engine isnt absolutely necessary Anyway think small guysand think lightweight engines well airframes have made large issue select ing lightweight engine maybe would help list some readily avail able engines approximate weights aid eventual engine selection Class OS Max 15 CoxTD 15 OS Max 20 Rossi 15 Fox 19 ST GiS ST G15/19 Class B OS Max 25 ST G20/23 some engines can readily mounted radially could eliminate mount altogether save another ounce up-front weightsomething may wish consider arriving eventual choice Construction Ideally completed model should balance desired CG location addition extra weight either end fuselage achieve recommended wing stabilizer completely finished before work fuselage progresses very far will per mit continual checking CG up final permanent attachment wing pylon atop fuselage box wing pylon final item fabricated Nit Wit particularly difficult model construct begin ners model shall assume may interested details its construction also beginners fore shall attempt refrain taxing integrity experienced modelers supeffluous explanation pins placed Also least cyanoacrylate vendors suggests construction methods pins am pin man myself certainly wish accused being old fashioned recognizing progress apparent Wing stab very difficult start explaining construction wing panel Ounces Grams beginning immortal 415118words Pin leading edge plans 425120Anyway whatever pet procedurebe 55156it pins 3M poster cement concrete 55156blockthe LE notched TE 56158inner wing panels have properly lo 56158cated plans fastened securely 56158place TE wing tip panels simply 55156standard 3A6 X /s tapered stock 58165front edges cut away diagonal resulting natural taper thickness wing tip Continued page 171 Note plan suggests commercial engine mount incorporated However Left no-nonsense rear end shows auto-rudder dethermalizer setup well famous logo Central Indiana Aeromodelers Actually author doesnt currently use auto-rudder function Right business end prototype model sports Supertigre G15 aluminum Tatone mount timer really modified K-Mart camera timer behind AA Tatone flood-off faceplate additional trigger mechanism auto-rudder later deemed unnecessary Note T-fitting flood-off line top engine intake shoots enough fuel intake stop engine dumps rest fuel away model 76 Model Aviation Theres OS Max 25 plain-bearing engine front end photograph Although about 65% larger displacement usual Supertigre GiS power plant model actually couple grams lighter goes show versatility possible considering lightweight engines smaller-than-normal competition FF Power models U THIS INSTALLMENT ON planes fly ing will attempt present something has missing up now much power goes what motor prop bat tery combine suitable model installment will brings series together long promised taken previous parts should assured first-time continuing Electric successwith under standing Thats what call Electric Elation time let repeat something said beginning often difficult impossible have first-hand familiarity everything means best ne picture anove ny uus urumer ana tne smaller below Dy Hera Durks Show parts ot slight line recent electric Fly events put Keystone RC Club large variety highly successful Electrics speaks well form power Only sounds fun audible lettering must still legible soft brush remove eraser residue nice have simply have have good pencil sharpener handy times should using fairly soft pencil about No 2 lead order get lines dark enough reproduction blueprint machine soft pencils should resharpened after few lines Mechanical drafting pencils extendable leads reasonably inexpensive much easier sharpen wooden counterparts last impor tant item good source light either natural artificial Now youve got paper taped drawing board light ruler hand freshly sharpened pencil other Now what First put down pencil put down ruler Before draw have determine two important prerequisites well-drawn nicelyexecuted design what going draw going draw suggest before attempt put design paper graphic form first have paper mathematicallyrepresented form Ive included column copy standard New Design Data Sheet sheet have included parameters feel important either affecting performance com pleted aircraft and/or necessary trans lating numbers construction plan significance parame ters insofar aircraft performance con cerned want deal strictly necessary making drawing now Start wing minimum will have have determined desired span area length root tip chords flap size specifications airfoil terms thick location high point both tip root An additional parameter data sheethut should beis leading edge radius LER Simply put LER circle drawn leading edge airfoil determines relative sharpness bluntness airfoil Lastly should determine planform shape wing ie straight-taper elliptical constant-chord swept forward back etc helpful hint straight-tapered wings straight flap hinge lines easiest build fly best mans opinion whos Now repeat above measurements stab elevator Span area pro portion total area primary concerns Tail thickness still subject jury out personal feel ings have changed preferring rather thick tails belief should thin possible given need structural rigidity Since primary function fuselage simply hold engine keep wing tail proper relationship other few numbers significant long nose going will put wing will put tail Again feel great deal significance what numbers articles purposes Ill leave own opinions save another time Suffice say will have decide parameters before can commit paper Now have good idea what airplane will look like aerodynamically can go back drawing board trans late numbers picture airplane concluded next month Photos comments news about Stunt should addressed Ted Fan cher 158 Flying Cloud Isle Foster City CA 94409 Nit Wit/Murphy Continued oaoe 76 itself bottom spars secured posi tion next ribs turn ce mented securely place locations shown Obviously hold off putting ribs dihedral joints until panels joined Vs sq top spar airfoil high point should cemented place time aid retaining proper alignment ribs panels removed plan easier add 3A2 X /g turbulators rear top spar after panels attached together probably good idea add 6 X 42 diagonal braces 3-FUNCTION ACCUETACH ITM O LCD Tachometer w/dual scale capability lOX lOOX Digital Voltmeter or load /56 checking/cycling TX/RX battery combos ACCU-1Clfl quick @ chargug operation 79 prepaid Nor money order Calif add 6% tax 94086 AVIONI NCSunnyva CA May 1984 171 LEOS LASER *JR STICK World Aerobatic Champion Ideal Trainer Top Quality Epoxy Gloss Pane atstaad,9 lois. & Foam Kt logo Cowl & Wheel Pants ia0 Span Waq Area 1050 .q n iava Laediag Gw Foam Wing90 Span Wing oe Annembly Time Area 1440 sq inches it 5 -12 lb. Balsa Fnsh Ks tagine Si., 75 13 Complete Stop Step In-95 struct ens m th P ctarest7 ght 16 20 lbst$PISHIPPING Lag 2 4 HPDirect Sales Only 9995READYMAR84 PLUS $1 SHIPPINGCap 20 & Cap 21 DirectSales Onifor 60- 12 engines facturers Quality Kits Large Scale Engines RO Un iv Canton OH 44707 Phone 216 4846810 484-4374 Tired Being Shot Down SUPER SERVO GARD Controls Throttle Cant * Constantly monitors receiver interference another trans mitter outside sources instantly reducing throttle idle until interference clears * Constantly monitors flight battery pack voltage instantly reduces throttle idle allowing time safely land * Responds instantly lose radio signal throttling back idle alerting flight problem * Affects throttle giving complete control other servos safe landing * Minimizes crash damage caused signal loss ending full force smash-ups Endorsed IMAAShew Team required shew nsodoi ii v1 SPECIFICATIONS Size KPS 1411 Servo Case Power 17 ma Volt CutOut Point 46 volts Pulse Width Range Adi 0628 milliseconds Systems 3 4 wire Temp Range 00 1400F Weight 12 oz Price $4795 Postpaid Specify connecter type posItIve er negatIve pulse ordering RaFa Enterprises 106 N Main St. Arlington OH 45814 419 365-5066 have large selection wing cores available stock Custom foam cutting reasonable prices Foam blocks nichrome wire special needs Wire $40025 feet 2040 60 size floats $1295 Months Special Sweet Stick AND Sweet Lo Stick Wings Only $900 Information Prices Contact Bee. Slit Aeremollel Eg neetq 21 Joe. Drive West Wwwick RI 02893 call 4011 525-68 3 P ease add $3 sh p Er Hand Foam its flest Deal flest THE NEWEST MOTOR FROM Fox AMERICAS LARGEST INDEPENDENT MANUFACTURER OF MODEL AIRPLANE PRODUCTS pox io BB Bore 650 Stroke600 Displacement199 RPM 84 prop . 17000 Weight81/4 OZ Fuel Consumption 4 oz mm Schneurle porting course rugged parts lots power good idle unique design feature upper cylinder casting can turned exhaust either side back rear exhaust installations Structurally Pox i9BB peer crankshaft made aircraft quality 8620 steel supported two 11mm ball bearings con rod bushed piston fully machined mehanite runs leaded steel liner 22000 Fox 19BBRC$5995 90219 Tiltdown Muffler1495 90220 Tiltup Muffler1495 50203 Motor Mount800 Fox MFG CO 5305 TOWOON AVEFORT SMITH ARK 72901 15011 646-1656 panel secured flat workbench aid preventing inherent warpage panels leave plans diagonals should omitted airfoil quite thin internal bracing necessary anti-warp considerations permanent assembly four indi vidual wing panels other same other wing Make sure mating ends properly beveled panel properly aligned plan view along respective 4-in polyhedral 1-in dihedral being incorporated Add A2 ply joint braces proper gussets indicated After constructing wing will find stab construction much same plans quite self-explanatory Both wing stab should sanded prepared covering favorite covering materialpreferably good tensile strength original model covered silkspan appropriately doped Randolph butyrate com bination gave great strength thin airfoil However found silkspan gradually absorbed fuel causing models weight slowly increase subsequent models have switched Coverites lightweight white Micafilm can claim excellent re sults materialboth its fuel proof skin stress properties Fuselage Parallel-sided profile-type fuse lages certainly very original nor fat balsa box alternatives Nit Wit incorporates interesting combination narrow tapering balsa box engine mount cheeks make rather pleasing silhouette both side plan views selection 3A2 balsa sheet fuselage top important should firm C-grain stock will become back bone fuselage pylon attached fuselage built upside down over plans rectangular-shaped /16 sheet formers cemented place loca tions shown /e sheet sides sembled next sure add /2-in tri angular balsa blocks four inside corners forward compartment before Ae sheet bottom attached /4-in sheet balsa cheeks can added after box Matched Performance System TOP PERFORMANCE K&B ENGINES Airplane 4 Marine K&B FUELS$&B GLOW PLUGS 7 Blends4 choices Matched Finish System BEST APPEARANCE K&B FIBERGLASS CLOTH K&B Micro-Balloons FILLER K&B SUPER POSY RESIN K&B SUPER POSY THINNER K&B SUPER POSY PRIMERI&B SUPER POSY PAINT K&R MIXING CUPS removed plans should pre-beveled before assembly ease carving have small homemade 9-in disc sander powered old washing machine motor ideal types oper ations also ideal facing off front fuselage prior adding 3A2 ply wood firewall laminates can ep oxied place after drilling mounting holes installation blind nuts retain engine mount mount attached front end fuselage carved sanded desired shape groove bent 3A2 piano wire skid can carved front firewall appropriate router held Dremel Moto Tool vertical fin added next ce mented together over plans four separate pieces /e sheet balsa lower skid portion being selected hard stock basswood would also okay skid portion After fin attached fuselage Vie sheet doubler Vie ply stab mount added entire assembly ready finish sanding point engine mount skid fuel timer should temporarily assembled along completed stab approxi mately locate all-important CG longitudinal point should marked sides fuselage box fuse lage laid its side over plans check fore aft relationship balance point marked pylon detail Should resultant balance point align itself such front edge yet-to-be-fabricated pylon would protrude forward fire wall leading edge pylon can angled rearward its base modified per plans trapezoidal pylon keel built over plans proper allowances necessary adjustment leading edge just stated left side contour parts PA PB slanting vertical 3A2 X Vie 2 sq strips can cemented place keel secured over plans right side parts may added after assembly removed plans After finishsanding pylon framework symmetri cal shape planked Vie balsa sheet grain running parallel slanted uprights Following proper trimming 172 Model Aviation HIGu QUALITY FOAM WING CORES AND CUSTOM FOAM CUTTING finish-sanding 3A2 sheet wing platform securely cemented top pylon left now determine exact CO location parts accesso ries assembled proper position pylon permanently cemented top fuselage box have often asked have ever pylon separate fuselage using method can say have used built-up pylon feature its simple direct cement attachment method about 12 years have yet have failure course attachment should made either epoxy cya noacrylate such Super T cellulose cement might too reliable application cover fuselages colored tissue silkspan using nitrate dope After few coats dope fog thin coat clear K&B Super Poxy usually will add heav ier color coating Super Poxy around engine pylon areas ward off fuel prob lems well add bit contrasting color model other accessories pretty much self-explanatory experienced modelers will incorporate own pet tachments anyway An auto-rudder corporated prototype model feature omitted subsequent deemed unnecessary model seems have plenty speed termina tion engine run coast flat right-right glide pattern aid automatic fin-kicker completely finished Nit Wit should thoroughly checked warps proper alignment am firm believer ample pre-flight preparations prevent first flight washout possibility stab should perfectly flat free warps Both wing tips should washed-out about A6 no 3A2 left inner panel should flat right inner panel should incorporate about A6 3Az washin situations can easily attained over steamy teakettle check results repeatedly few days guarantee permanent settings rudder should warped no about 2 right compensate right wing washin engine should mounted about /2 degree left sidethrust Run engine number times en sure initial timer setting about 3 sec doesnt sound like much model will get away quickly after launch initial test hop made prop frontwards engine leaned out am firm advocate vertical launch theory assumes model trimmed no drastic warps kind launched vertically almost model will travel directly away ground should have tendency little out trim will take time 3 sec turn around come back least hard ground moves much further away faster rate vertical launch old ignition-era low angle-of-attack-type launches used years An other argument since ultimate launch angle will about 800 ground way waste time submit backward-mounted broken props beginning near-horizontal low power trimming procedure gradually moving up eventual contest launch mode can just point model straight up engine screaming 3-sec test hop get scary agony over hurry certainly sounds simple anyway doesnt Speaking agony point shall volunteer relieve further claims testimonials contest potential Nit Wit design has enjoy able hope may find just enjoyable well See downwind Electrics/Kopski Continued oaoe 82 prop unloads flight motor cur rent decreases perhaps 10-15% cooling air flows motor battery youve applied what youve read series Most importantly power infor mation given directly applicable various rules thumb given previously Basically two limitations recognize determining quit pushing some motor current limi May1984 173 HobbypoxySt selei colors tallics h finishing flat can spray productstthobby close Whether model wood metal fiberglass plastic combina tion whether flies sails rolls Hobbypoxy formulated let paint build repair pamper perfection HOBBYPOXY PRODUCTS division Pettit Paint Company Inc 10 Pine Street Box 378 Rockaway NJ 07866-0378 IC1 big FREE offer Send complete literature howto-guide well tell qualify time get acquainted offer $475 worth Hobbypoxy products abso lutely FREE
Edition: Model Aviation - 1984/05
Page Numbers: 74, 75, 76, 78, 171, 172, 173
Occupying seat honor late-model version wing stab covering lightweight Coverite Micafilm Black lettering wing inexpensive stick-on vinyl found stationery department large drugstores like Its state art model Category Ill sites ACTIVE FF GAS enthusiasts reside east Mississippi River certainly aware seemingly endless struggle recent years obtain retain suitable fly ing sites competitions Large sites have become extinct currently available much closer small field variety Some years ago AMA Contest Board recognized need tailor Free Flight competitions according size flying field Categories II LII re sulted special engine run flight time limits separate National Rec ord tally kept three cate gones Whether intended action cer tainly instilled renewed vigor throughout Free Flight community opportunity win contest set national record same time small-field situation provided basis additional incentive enthusiasm three-category system gave small-site contestant chance make record books againa feat become increasingly difficult smaller sites east Big Muddy Smallfield competitors able convert assumed handicap definite challenge Category III contests eventually sumed character own case point am familiar succession contests WrightPatterson AFE Dayton OH following 1976 AMA Nats affair opened previously-unavailable old Wright Field area clubs weekend competitions given days little wind drift site could sustain Category II activity However since high fences enclose historic air base virtually unscaleable four area FF clubs sponsored meets chose 2-mm Category III limits long series contest providing steady diet 5-sec engine run 2-mm max limitson superb flying site four different area clubs sponsoring contests same field near monthly basis rather simple task track progress contestants attacking 5-sec 2-mm challenge time couple flying seasons passed W-P contestants beginning get good grip 5 2 limits unusual endure marathon run ning double digits flyoff flights determine winner course model design engine combinations taking interesting trend Simply adding power existing models such Schnuerle-ported engines necessarily ultimate answer Total model weight deemed important factor attempting squeeze 2 mm flight time out 5-sec engine run Schnuerles although quite powerful also quite heavy spring 1979 lightweight models built around lightweight engines ginning show considerable promise Two initial success stories Gib Robbins superlight rear-finned 320 sq Satellite powered Cox TD 09 Gil Morris early Toothpicks series using light weight Fox engines Gibs model parThe inception several years ago FF Power model rules smaller fields 5-sec engine run 2-mm max required some new thinking avoid being also-ran model Class B has shown its worth under conditionsE Harry Murphy 74 Model Aviation inimitable tongue-In-cheek way Harry Mur phy says Note arrow pointing directly real Nit Wit i great model designer/f puts together witty CIA former newsletter plc Joe Guyias shot Wright Fieid ticularly significant first con sistent lightweight combination begin edging previously-dominant FAI Power entries out Class trophy lines culminated winning Class 1979 Lincoln Nats Category III contest effort curb marathon flyoff situation 1980 rules changed trim Category III flyoff engine run 4 sec after fifth max change eliminated FAI Power model con tention found too heavy glide 2 mm 4-sec engine run 1980 Nats W-P proved Wright Field regulars up task fact first-place trophies Power events taken back across Mis sissippi Ralph Prey years has voiced opin ion have use super-hot engine ensure competitive engine/model combo has often stated building proper model around engine regardless its comparative power can produce very satisfactory results philosophy cer tainly applicable successful presentday Category III models Surrendering old adage cant beat emjoin em Nit Wit came about during spring 1980 completed just time 1980 Day ton Nats intention create smaller-than-normal model would speedy enough reach same altitude 4 sec previous years bigger model reached 5 sec single second may appear very significant 20% right off top power pattern small model would also require very light weight engine total model weight kept minimum would advantageous simply build smaller model total weight also re duced altitude attained power burst could sustained glide remaining 116 sec can very long time glide model leaves something desired After weighing Class en gines lightest far old Cox TD 15 4'4 oz selected first Nit Wit combo its optimistic pilot went 1980 Nats hoping capture marbles Class first three official flights produced three maxes trotted downwind retrieve model third max feeling pretty good about new design However model dethermalized onto rear bumper parked van knocking off engine front fuselage Since insufficient time make appropriate re pairs hurriedly put Cox TD 051 same Lunar-Tic 240 won event previous dayand eventually chugged fourth place spectacular beginning con vinced design would provide lot enjoyment future sure joy fly Since old Cox bit cranky occasion some engine parts difficult obtain stepped up Super tigre G 15 repaired fuselage dur ing following winter power plant switch cost over ounce weight pen alty power increase con siderable First flights using variety 7-4 wood fiberglass props indicated design could really handle excessive power subsequent flights made ST G15/19 special Doc Anderson ST G 15/23 23 piston cylinder crammed GLS crankcase Once trimmed desired power groove design appeared very forgiving changes engine prototype Class model proving excellent test bed subsequent models same size possible scaled-up versions larger FF Power classes After repairing original Nit Wit also crash-built larger version dubbed Dim-Wit prior 1982 Nats fortunate win Class D Lincoln also Category III affair model created same thoughts mind size weight kept minimum Dim Wit 535 sq model weigh ing 26 oz sporting OS Chamberlain 42 can certainly raise few eyebrows faces friendly competitors can state Class D entry weighs 26 ounces particular lightweight engine brainJim Waistons camera caught Nit Wit split second after launch Jim ribs Harry about basketball launchsays looks Harry practicing set shot ship moves child fellow CIA Club member Mere dith Chamberlain first take ad vantage discovery bore current OS Max 40 bit larger bore previous OS Max-H mod els Should mix up parts can produce very reputable engine teresting displacement 42 cu article supposed centered Class design purpose mentioning parallel point out superlight engine/model theory appears work well other clsses Category III com petition well Also incorporation awesome power Schnuerle engine isnt absolutely necessary Anyway think small guysand think lightweight engines well airframes have made large issue select ing lightweight engine maybe would help list some readily avail able engines approximate weights aid eventual engine selection Class OS Max 15 CoxTD 15 OS Max 20 Rossi 15 Fox 19 ST GiS ST G15/19 Class B OS Max 25 ST G20/23 some engines can readily mounted radially could eliminate mount altogether save another ounce up-front weightsomething may wish consider arriving eventual choice Construction Ideally completed model should balance desired CG location addition extra weight either end fuselage achieve recommended wing stabilizer completely finished before work fuselage progresses very far will per mit continual checking CG up final permanent attachment wing pylon atop fuselage box wing pylon final item fabricated Nit Wit particularly difficult model construct begin ners model shall assume may interested details its construction also beginners fore shall attempt refrain taxing integrity experienced modelers supeffluous explanation pins placed Also least cyanoacrylate vendors suggests construction methods pins am pin man myself certainly wish accused being old fashioned recognizing progress apparent Wing stab very difficult start explaining construction wing panel Ounces Grams beginning immortal 415118words Pin leading edge plans 425120Anyway whatever pet procedurebe 55156it pins 3M poster cement concrete 55156blockthe LE notched TE 56158inner wing panels have properly lo 56158cated plans fastened securely 56158place TE wing tip panels simply 55156standard 3A6 X /s tapered stock 58165front edges cut away diagonal resulting natural taper thickness wing tip Continued page 171 Note plan suggests commercial engine mount incorporated However Left no-nonsense rear end shows auto-rudder dethermalizer setup well famous logo Central Indiana Aeromodelers Actually author doesnt currently use auto-rudder function Right business end prototype model sports Supertigre G15 aluminum Tatone mount timer really modified K-Mart camera timer behind AA Tatone flood-off faceplate additional trigger mechanism auto-rudder later deemed unnecessary Note T-fitting flood-off line top engine intake shoots enough fuel intake stop engine dumps rest fuel away model 76 Model Aviation Theres OS Max 25 plain-bearing engine front end photograph Although about 65% larger displacement usual Supertigre GiS power plant model actually couple grams lighter goes show versatility possible considering lightweight engines smaller-than-normal competition FF Power models U THIS INSTALLMENT ON planes fly ing will attempt present something has missing up now much power goes what motor prop bat tery combine suitable model installment will brings series together long promised taken previous parts should assured first-time continuing Electric successwith under standing Thats what call Electric Elation time let repeat something said beginning often difficult impossible have first-hand familiarity everything means best ne picture anove ny uus urumer ana tne smaller below Dy Hera Durks Show parts ot slight line recent electric Fly events put Keystone RC Club large variety highly successful Electrics speaks well form power Only sounds fun audible lettering must still legible soft brush remove eraser residue nice have simply have have good pencil sharpener handy times should using fairly soft pencil about No 2 lead order get lines dark enough reproduction blueprint machine soft pencils should resharpened after few lines Mechanical drafting pencils extendable leads reasonably inexpensive much easier sharpen wooden counterparts last impor tant item good source light either natural artificial Now youve got paper taped drawing board light ruler hand freshly sharpened pencil other Now what First put down pencil put down ruler Before draw have determine two important prerequisites well-drawn nicelyexecuted design what going draw going draw suggest before attempt put design paper graphic form first have paper mathematicallyrepresented form Ive included column copy standard New Design Data Sheet sheet have included parameters feel important either affecting performance com pleted aircraft and/or necessary trans lating numbers construction plan significance parame ters insofar aircraft performance con cerned want deal strictly necessary making drawing now Start wing minimum will have have determined desired span area length root tip chords flap size specifications airfoil terms thick location high point both tip root An additional parameter data sheethut should beis leading edge radius LER Simply put LER circle drawn leading edge airfoil determines relative sharpness bluntness airfoil Lastly should determine planform shape wing ie straight-taper elliptical constant-chord swept forward back etc helpful hint straight-tapered wings straight flap hinge lines easiest build fly best mans opinion whos Now repeat above measurements stab elevator Span area pro portion total area primary concerns Tail thickness still subject jury out personal feel ings have changed preferring rather thick tails belief should thin possible given need structural rigidity Since primary function fuselage simply hold engine keep wing tail proper relationship other few numbers significant long nose going will put wing will put tail Again feel great deal significance what numbers articles purposes Ill leave own opinions save another time Suffice say will have decide parameters before can commit paper Now have good idea what airplane will look like aerodynamically can go back drawing board trans late numbers picture airplane concluded next month Photos comments news about Stunt should addressed Ted Fan cher 158 Flying Cloud Isle Foster City CA 94409 Nit Wit/Murphy Continued oaoe 76 itself bottom spars secured posi tion next ribs turn ce mented securely place locations shown Obviously hold off putting ribs dihedral joints until panels joined Vs sq top spar airfoil high point should cemented place time aid retaining proper alignment ribs panels removed plan easier add 3A2 X /g turbulators rear top spar after panels attached together probably good idea add 6 X 42 diagonal braces 3-FUNCTION ACCUETACH ITM O LCD Tachometer w/dual scale capability lOX lOOX Digital Voltmeter or load /56 checking/cycling TX/RX battery combos ACCU-1Clfl quick @ chargug operation 79 prepaid Nor money order Calif add 6% tax 94086 AVIONI NCSunnyva CA May 1984 171 LEOS LASER *JR STICK World Aerobatic Champion Ideal Trainer Top Quality Epoxy Gloss Pane atstaad,9 lois. & Foam Kt logo Cowl & Wheel Pants ia0 Span Waq Area 1050 .q n iava Laediag Gw Foam Wing90 Span Wing oe Annembly Time Area 1440 sq inches it 5 -12 lb. Balsa Fnsh Ks tagine Si., 75 13 Complete Stop Step In-95 struct ens m th P ctarest7 ght 16 20 lbst$PISHIPPING Lag 2 4 HPDirect Sales Only 9995READYMAR84 PLUS $1 SHIPPINGCap 20 & Cap 21 DirectSales Onifor 60- 12 engines facturers Quality Kits Large Scale Engines RO Un iv Canton OH 44707 Phone 216 4846810 484-4374 Tired Being Shot Down SUPER SERVO GARD Controls Throttle Cant * Constantly monitors receiver interference another trans mitter outside sources instantly reducing throttle idle until interference clears * Constantly monitors flight battery pack voltage instantly reduces throttle idle allowing time safely land * Responds instantly lose radio signal throttling back idle alerting flight problem * Affects throttle giving complete control other servos safe landing * Minimizes crash damage caused signal loss ending full force smash-ups Endorsed IMAAShew Team required shew nsodoi ii v1 SPECIFICATIONS Size KPS 1411 Servo Case Power 17 ma Volt CutOut Point 46 volts Pulse Width Range Adi 0628 milliseconds Systems 3 4 wire Temp Range 00 1400F Weight 12 oz Price $4795 Postpaid Specify connecter type posItIve er negatIve pulse ordering RaFa Enterprises 106 N Main St. Arlington OH 45814 419 365-5066 have large selection wing cores available stock Custom foam cutting reasonable prices Foam blocks nichrome wire special needs Wire $40025 feet 2040 60 size floats $1295 Months Special Sweet Stick AND Sweet Lo Stick Wings Only $900 Information Prices Contact Bee. Slit Aeremollel Eg neetq 21 Joe. Drive West Wwwick RI 02893 call 4011 525-68 3 P ease add $3 sh p Er Hand Foam its flest Deal flest THE NEWEST MOTOR FROM Fox AMERICAS LARGEST INDEPENDENT MANUFACTURER OF MODEL AIRPLANE PRODUCTS pox io BB Bore 650 Stroke600 Displacement199 RPM 84 prop . 17000 Weight81/4 OZ Fuel Consumption 4 oz mm Schneurle porting course rugged parts lots power good idle unique design feature upper cylinder casting can turned exhaust either side back rear exhaust installations Structurally Pox i9BB peer crankshaft made aircraft quality 8620 steel supported two 11mm ball bearings con rod bushed piston fully machined mehanite runs leaded steel liner 22000 Fox 19BBRC$5995 90219 Tiltdown Muffler1495 90220 Tiltup Muffler1495 50203 Motor Mount800 Fox MFG CO 5305 TOWOON AVEFORT SMITH ARK 72901 15011 646-1656 panel secured flat workbench aid preventing inherent warpage panels leave plans diagonals should omitted airfoil quite thin internal bracing necessary anti-warp considerations permanent assembly four indi vidual wing panels other same other wing Make sure mating ends properly beveled panel properly aligned plan view along respective 4-in polyhedral 1-in dihedral being incorporated Add A2 ply joint braces proper gussets indicated After constructing wing will find stab construction much same plans quite self-explanatory Both wing stab should sanded prepared covering favorite covering materialpreferably good tensile strength original model covered silkspan appropriately doped Randolph butyrate com bination gave great strength thin airfoil However found silkspan gradually absorbed fuel causing models weight slowly increase subsequent models have switched Coverites lightweight white Micafilm can claim excellent re sults materialboth its fuel proof skin stress properties Fuselage Parallel-sided profile-type fuse lages certainly very original nor fat balsa box alternatives Nit Wit incorporates interesting combination narrow tapering balsa box engine mount cheeks make rather pleasing silhouette both side plan views selection 3A2 balsa sheet fuselage top important should firm C-grain stock will become back bone fuselage pylon attached fuselage built upside down over plans rectangular-shaped /16 sheet formers cemented place loca tions shown /e sheet sides sembled next sure add /2-in tri angular balsa blocks four inside corners forward compartment before Ae sheet bottom attached /4-in sheet balsa cheeks can added after box Matched Performance System TOP PERFORMANCE K&B ENGINES Airplane 4 Marine K&B FUELS$&B GLOW PLUGS 7 Blends4 choices Matched Finish System BEST APPEARANCE K&B FIBERGLASS CLOTH K&B Micro-Balloons FILLER K&B SUPER POSY RESIN K&B SUPER POSY THINNER K&B SUPER POSY PRIMERI&B SUPER POSY PAINT K&R MIXING CUPS removed plans should pre-beveled before assembly ease carving have small homemade 9-in disc sander powered old washing machine motor ideal types oper ations also ideal facing off front fuselage prior adding 3A2 ply wood firewall laminates can ep oxied place after drilling mounting holes installation blind nuts retain engine mount mount attached front end fuselage carved sanded desired shape groove bent 3A2 piano wire skid can carved front firewall appropriate router held Dremel Moto Tool vertical fin added next ce mented together over plans four separate pieces /e sheet balsa lower skid portion being selected hard stock basswood would also okay skid portion After fin attached fuselage Vie sheet doubler Vie ply stab mount added entire assembly ready finish sanding point engine mount skid fuel timer should temporarily assembled along completed stab approxi mately locate all-important CG longitudinal point should marked sides fuselage box fuse lage laid its side over plans check fore aft relationship balance point marked pylon detail Should resultant balance point align itself such front edge yet-to-be-fabricated pylon would protrude forward fire wall leading edge pylon can angled rearward its base modified per plans trapezoidal pylon keel built over plans proper allowances necessary adjustment leading edge just stated left side contour parts PA PB slanting vertical 3A2 X Vie 2 sq strips can cemented place keel secured over plans right side parts may added after assembly removed plans After finishsanding pylon framework symmetri cal shape planked Vie balsa sheet grain running parallel slanted uprights Following proper trimming 172 Model Aviation HIGu QUALITY FOAM WING CORES AND CUSTOM FOAM CUTTING finish-sanding 3A2 sheet wing platform securely cemented top pylon left now determine exact CO location parts accesso ries assembled proper position pylon permanently cemented top fuselage box have often asked have ever pylon separate fuselage using method can say have used built-up pylon feature its simple direct cement attachment method about 12 years have yet have failure course attachment should made either epoxy cya noacrylate such Super T cellulose cement might too reliable application cover fuselages colored tissue silkspan using nitrate dope After few coats dope fog thin coat clear K&B Super Poxy usually will add heav ier color coating Super Poxy around engine pylon areas ward off fuel prob lems well add bit contrasting color model other accessories pretty much self-explanatory experienced modelers will incorporate own pet tachments anyway An auto-rudder corporated prototype model feature omitted subsequent deemed unnecessary model seems have plenty speed termina tion engine run coast flat right-right glide pattern aid automatic fin-kicker completely finished Nit Wit should thoroughly checked warps proper alignment am firm believer ample pre-flight preparations prevent first flight washout possibility stab should perfectly flat free warps Both wing tips should washed-out about A6 no 3A2 left inner panel should flat right inner panel should incorporate about A6 3Az washin situations can easily attained over steamy teakettle check results repeatedly few days guarantee permanent settings rudder should warped no about 2 right compensate right wing washin engine should mounted about /2 degree left sidethrust Run engine number times en sure initial timer setting about 3 sec doesnt sound like much model will get away quickly after launch initial test hop made prop frontwards engine leaned out am firm advocate vertical launch theory assumes model trimmed no drastic warps kind launched vertically almost model will travel directly away ground should have tendency little out trim will take time 3 sec turn around come back least hard ground moves much further away faster rate vertical launch old ignition-era low angle-of-attack-type launches used years An other argument since ultimate launch angle will about 800 ground way waste time submit backward-mounted broken props beginning near-horizontal low power trimming procedure gradually moving up eventual contest launch mode can just point model straight up engine screaming 3-sec test hop get scary agony over hurry certainly sounds simple anyway doesnt Speaking agony point shall volunteer relieve further claims testimonials contest potential Nit Wit design has enjoy able hope may find just enjoyable well See downwind Electrics/Kopski Continued oaoe 82 prop unloads flight motor cur rent decreases perhaps 10-15% cooling air flows motor battery youve applied what youve read series Most importantly power infor mation given directly applicable various rules thumb given previously Basically two limitations recognize determining quit pushing some motor current limi May1984 173 HobbypoxySt selei colors tallics h finishing flat can spray productstthobby close Whether model wood metal fiberglass plastic combina tion whether flies sails rolls Hobbypoxy formulated let paint build repair pamper perfection HOBBYPOXY PRODUCTS division Pettit Paint Company Inc 10 Pine Street Box 378 Rockaway NJ 07866-0378 IC1 big FREE offer Send complete literature howto-guide well tell qualify time get acquainted offer $475 worth Hobbypoxy products abso lutely FREE
Edition: Model Aviation - 1984/05
Page Numbers: 74, 75, 76, 78, 171, 172, 173
Occupying seat honor late-model version wing stab covering lightweight Coverite Micafilm Black lettering wing inexpensive stick-on vinyl found stationery department large drugstores like Its state art model Category Ill sites ACTIVE FF GAS enthusiasts reside east Mississippi River certainly aware seemingly endless struggle recent years obtain retain suitable fly ing sites competitions Large sites have become extinct currently available much closer small field variety Some years ago AMA Contest Board recognized need tailor Free Flight competitions according size flying field Categories II LII re sulted special engine run flight time limits separate National Rec ord tally kept three cate gones Whether intended action cer tainly instilled renewed vigor throughout Free Flight community opportunity win contest set national record same time small-field situation provided basis additional incentive enthusiasm three-category system gave small-site contestant chance make record books againa feat become increasingly difficult smaller sites east Big Muddy Smallfield competitors able convert assumed handicap definite challenge Category III contests eventually sumed character own case point am familiar succession contests WrightPatterson AFE Dayton OH following 1976 AMA Nats affair opened previously-unavailable old Wright Field area clubs weekend competitions given days little wind drift site could sustain Category II activity However since high fences enclose historic air base virtually unscaleable four area FF clubs sponsored meets chose 2-mm Category III limits long series contest providing steady diet 5-sec engine run 2-mm max limitson superb flying site four different area clubs sponsoring contests same field near monthly basis rather simple task track progress contestants attacking 5-sec 2-mm challenge time couple flying seasons passed W-P contestants beginning get good grip 5 2 limits unusual endure marathon run ning double digits flyoff flights determine winner course model design engine combinations taking interesting trend Simply adding power existing models such Schnuerle-ported engines necessarily ultimate answer Total model weight deemed important factor attempting squeeze 2 mm flight time out 5-sec engine run Schnuerles although quite powerful also quite heavy spring 1979 lightweight models built around lightweight engines ginning show considerable promise Two initial success stories Gib Robbins superlight rear-finned 320 sq Satellite powered Cox TD 09 Gil Morris early Toothpicks series using light weight Fox engines Gibs model parThe inception several years ago FF Power model rules smaller fields 5-sec engine run 2-mm max required some new thinking avoid being also-ran model Class B has shown its worth under conditionsE Harry Murphy 74 Model Aviation inimitable tongue-In-cheek way Harry Mur phy says Note arrow pointing directly real Nit Wit i great model designer/f puts together witty CIA former newsletter plc Joe Guyias shot Wright Fieid ticularly significant first con sistent lightweight combination begin edging previously-dominant FAI Power entries out Class trophy lines culminated winning Class 1979 Lincoln Nats Category III contest effort curb marathon flyoff situation 1980 rules changed trim Category III flyoff engine run 4 sec after fifth max change eliminated FAI Power model con tention found too heavy glide 2 mm 4-sec engine run 1980 Nats W-P proved Wright Field regulars up task fact first-place trophies Power events taken back across Mis sissippi Ralph Prey years has voiced opin ion have use super-hot engine ensure competitive engine/model combo has often stated building proper model around engine regardless its comparative power can produce very satisfactory results philosophy cer tainly applicable successful presentday Category III models Surrendering old adage cant beat emjoin em Nit Wit came about during spring 1980 completed just time 1980 Day ton Nats intention create smaller-than-normal model would speedy enough reach same altitude 4 sec previous years bigger model reached 5 sec single second may appear very significant 20% right off top power pattern small model would also require very light weight engine total model weight kept minimum would advantageous simply build smaller model total weight also re duced altitude attained power burst could sustained glide remaining 116 sec can very long time glide model leaves something desired After weighing Class en gines lightest far old Cox TD 15 4'4 oz selected first Nit Wit combo its optimistic pilot went 1980 Nats hoping capture marbles Class first three official flights produced three maxes trotted downwind retrieve model third max feeling pretty good about new design However model dethermalized onto rear bumper parked van knocking off engine front fuselage Since insufficient time make appropriate re pairs hurriedly put Cox TD 051 same Lunar-Tic 240 won event previous dayand eventually chugged fourth place spectacular beginning con vinced design would provide lot enjoyment future sure joy fly Since old Cox bit cranky occasion some engine parts difficult obtain stepped up Super tigre G 15 repaired fuselage dur ing following winter power plant switch cost over ounce weight pen alty power increase con siderable First flights using variety 7-4 wood fiberglass props indicated design could really handle excessive power subsequent flights made ST G15/19 special Doc Anderson ST G 15/23 23 piston cylinder crammed GLS crankcase Once trimmed desired power groove design appeared very forgiving changes engine prototype Class model proving excellent test bed subsequent models same size possible scaled-up versions larger FF Power classes After repairing original Nit Wit also crash-built larger version dubbed Dim-Wit prior 1982 Nats fortunate win Class D Lincoln also Category III affair model created same thoughts mind size weight kept minimum Dim Wit 535 sq model weigh ing 26 oz sporting OS Chamberlain 42 can certainly raise few eyebrows faces friendly competitors can state Class D entry weighs 26 ounces particular lightweight engine brainJim Waistons camera caught Nit Wit split second after launch Jim ribs Harry about basketball launchsays looks Harry practicing set shot ship moves child fellow CIA Club member Mere dith Chamberlain first take ad vantage discovery bore current OS Max 40 bit larger bore previous OS Max-H mod els Should mix up parts can produce very reputable engine teresting displacement 42 cu article supposed centered Class design purpose mentioning parallel point out superlight engine/model theory appears work well other clsses Category III com petition well Also incorporation awesome power Schnuerle engine isnt absolutely necessary Anyway think small guysand think lightweight engines well airframes have made large issue select ing lightweight engine maybe would help list some readily avail able engines approximate weights aid eventual engine selection Class OS Max 15 CoxTD 15 OS Max 20 Rossi 15 Fox 19 ST GiS ST G15/19 Class B OS Max 25 ST G20/23 some engines can readily mounted radially could eliminate mount altogether save another ounce up-front weightsomething may wish consider arriving eventual choice Construction Ideally completed model should balance desired CG location addition extra weight either end fuselage achieve recommended wing stabilizer completely finished before work fuselage progresses very far will per mit continual checking CG up final permanent attachment wing pylon atop fuselage box wing pylon final item fabricated Nit Wit particularly difficult model construct begin ners model shall assume may interested details its construction also beginners fore shall attempt refrain taxing integrity experienced modelers supeffluous explanation pins placed Also least cyanoacrylate vendors suggests construction methods pins am pin man myself certainly wish accused being old fashioned recognizing progress apparent Wing stab very difficult start explaining construction wing panel Ounces Grams beginning immortal 415118words Pin leading edge plans 425120Anyway whatever pet procedurebe 55156it pins 3M poster cement concrete 55156blockthe LE notched TE 56158inner wing panels have properly lo 56158cated plans fastened securely 56158place TE wing tip panels simply 55156standard 3A6 X /s tapered stock 58165front edges cut away diagonal resulting natural taper thickness wing tip Continued page 171 Note plan suggests commercial engine mount incorporated However Left no-nonsense rear end shows auto-rudder dethermalizer setup well famous logo Central Indiana Aeromodelers Actually author doesnt currently use auto-rudder function Right business end prototype model sports Supertigre G15 aluminum Tatone mount timer really modified K-Mart camera timer behind AA Tatone flood-off faceplate additional trigger mechanism auto-rudder later deemed unnecessary Note T-fitting flood-off line top engine intake shoots enough fuel intake stop engine dumps rest fuel away model 76 Model Aviation Theres OS Max 25 plain-bearing engine front end photograph Although about 65% larger displacement usual Supertigre GiS power plant model actually couple grams lighter goes show versatility possible considering lightweight engines smaller-than-normal competition FF Power models U THIS INSTALLMENT ON planes fly ing will attempt present something has missing up now much power goes what motor prop bat tery combine suitable model installment will brings series together long promised taken previous parts should assured first-time continuing Electric successwith under standing Thats what call Electric Elation time let repeat something said beginning often difficult impossible have first-hand familiarity everything means best ne picture anove ny uus urumer ana tne smaller below Dy Hera Durks Show parts ot slight line recent electric Fly events put Keystone RC Club large variety highly successful Electrics speaks well form power Only sounds fun audible lettering must still legible soft brush remove eraser residue nice have simply have have good pencil sharpener handy times should using fairly soft pencil about No 2 lead order get lines dark enough reproduction blueprint machine soft pencils should resharpened after few lines Mechanical drafting pencils extendable leads reasonably inexpensive much easier sharpen wooden counterparts last impor tant item good source light either natural artificial Now youve got paper taped drawing board light ruler hand freshly sharpened pencil other Now what First put down pencil put down ruler Before draw have determine two important prerequisites well-drawn nicelyexecuted design what going draw going draw suggest before attempt put design paper graphic form first have paper mathematicallyrepresented form Ive included column copy standard New Design Data Sheet sheet have included parameters feel important either affecting performance com pleted aircraft and/or necessary trans lating numbers construction plan significance parame ters insofar aircraft performance con cerned want deal strictly necessary making drawing now Start wing minimum will have have determined desired span area length root tip chords flap size specifications airfoil terms thick location high point both tip root An additional parameter data sheethut should beis leading edge radius LER Simply put LER circle drawn leading edge airfoil determines relative sharpness bluntness airfoil Lastly should determine planform shape wing ie straight-taper elliptical constant-chord swept forward back etc helpful hint straight-tapered wings straight flap hinge lines easiest build fly best mans opinion whos Now repeat above measurements stab elevator Span area pro portion total area primary concerns Tail thickness still subject jury out personal feel ings have changed preferring rather thick tails belief should thin possible given need structural rigidity Since primary function fuselage simply hold engine keep wing tail proper relationship other few numbers significant long nose going will put wing will put tail Again feel great deal significance what numbers articles purposes Ill leave own opinions save another time Suffice say will have decide parameters before can commit paper Now have good idea what airplane will look like aerodynamically can go back drawing board trans late numbers picture airplane concluded next month Photos comments news about Stunt should addressed Ted Fan cher 158 Flying Cloud Isle Foster City CA 94409 Nit Wit/Murphy Continued oaoe 76 itself bottom spars secured posi tion next ribs turn ce mented securely place locations shown Obviously hold off putting ribs dihedral joints until panels joined Vs sq top spar airfoil high point should cemented place time aid retaining proper alignment ribs panels removed plan easier add 3A2 X /g turbulators rear top spar after panels attached together probably good idea add 6 X 42 diagonal braces 3-FUNCTION ACCUETACH ITM O LCD Tachometer w/dual scale capability lOX lOOX Digital Voltmeter or load /56 checking/cycling TX/RX battery combos ACCU-1Clfl quick @ chargug operation 79 prepaid Nor money order Calif add 6% tax 94086 AVIONI NCSunnyva CA May 1984 171 LEOS LASER *JR STICK World Aerobatic Champion Ideal Trainer Top Quality Epoxy Gloss Pane atstaad,9 lois. & Foam Kt logo Cowl & Wheel Pants ia0 Span Waq Area 1050 .q n iava Laediag Gw Foam Wing90 Span Wing oe Annembly Time Area 1440 sq inches it 5 -12 lb. Balsa Fnsh Ks tagine Si., 75 13 Complete Stop Step In-95 struct ens m th P ctarest7 ght 16 20 lbst$PISHIPPING Lag 2 4 HPDirect Sales Only 9995READYMAR84 PLUS $1 SHIPPINGCap 20 & Cap 21 DirectSales Onifor 60- 12 engines facturers Quality Kits Large Scale Engines RO Un iv Canton OH 44707 Phone 216 4846810 484-4374 Tired Being Shot Down SUPER SERVO GARD Controls Throttle Cant * Constantly monitors receiver interference another trans mitter outside sources instantly reducing throttle idle until interference clears * Constantly monitors flight battery pack voltage instantly reduces throttle idle allowing time safely land * Responds instantly lose radio signal throttling back idle alerting flight problem * Affects throttle giving complete control other servos safe landing * Minimizes crash damage caused signal loss ending full force smash-ups Endorsed IMAAShew Team required shew nsodoi ii v1 SPECIFICATIONS Size KPS 1411 Servo Case Power 17 ma Volt CutOut Point 46 volts Pulse Width Range Adi 0628 milliseconds Systems 3 4 wire Temp Range 00 1400F Weight 12 oz Price $4795 Postpaid Specify connecter type posItIve er negatIve pulse ordering RaFa Enterprises 106 N Main St. Arlington OH 45814 419 365-5066 have large selection wing cores available stock Custom foam cutting reasonable prices Foam blocks nichrome wire special needs Wire $40025 feet 2040 60 size floats $1295 Months Special Sweet Stick AND Sweet Lo Stick Wings Only $900 Information Prices Contact Bee. Slit Aeremollel Eg neetq 21 Joe. Drive West Wwwick RI 02893 call 4011 525-68 3 P ease add $3 sh p Er Hand Foam its flest Deal flest THE NEWEST MOTOR FROM Fox AMERICAS LARGEST INDEPENDENT MANUFACTURER OF MODEL AIRPLANE PRODUCTS pox io BB Bore 650 Stroke600 Displacement199 RPM 84 prop . 17000 Weight81/4 OZ Fuel Consumption 4 oz mm Schneurle porting course rugged parts lots power good idle unique design feature upper cylinder casting can turned exhaust either side back rear exhaust installations Structurally Pox i9BB peer crankshaft made aircraft quality 8620 steel supported two 11mm ball bearings con rod bushed piston fully machined mehanite runs leaded steel liner 22000 Fox 19BBRC$5995 90219 Tiltdown Muffler1495 90220 Tiltup Muffler1495 50203 Motor Mount800 Fox MFG CO 5305 TOWOON AVEFORT SMITH ARK 72901 15011 646-1656 panel secured flat workbench aid preventing inherent warpage panels leave plans diagonals should omitted airfoil quite thin internal bracing necessary anti-warp considerations permanent assembly four indi vidual wing panels other same other wing Make sure mating ends properly beveled panel properly aligned plan view along respective 4-in polyhedral 1-in dihedral being incorporated Add A2 ply joint braces proper gussets indicated After constructing wing will find stab construction much same plans quite self-explanatory Both wing stab should sanded prepared covering favorite covering materialpreferably good tensile strength original model covered silkspan appropriately doped Randolph butyrate com bination gave great strength thin airfoil However found silkspan gradually absorbed fuel causing models weight slowly increase subsequent models have switched Coverites lightweight white Micafilm can claim excellent re sults materialboth its fuel proof skin stress properties Fuselage Parallel-sided profile-type fuse lages certainly very original nor fat balsa box alternatives Nit Wit incorporates interesting combination narrow tapering balsa box engine mount cheeks make rather pleasing silhouette both side plan views selection 3A2 balsa sheet fuselage top important should firm C-grain stock will become back bone fuselage pylon attached fuselage built upside down over plans rectangular-shaped /16 sheet formers cemented place loca tions shown /e sheet sides sembled next sure add /2-in tri angular balsa blocks four inside corners forward compartment before Ae sheet bottom attached /4-in sheet balsa cheeks can added after box Matched Performance System TOP PERFORMANCE K&B ENGINES Airplane 4 Marine K&B FUELS$&B GLOW PLUGS 7 Blends4 choices Matched Finish System BEST APPEARANCE K&B FIBERGLASS CLOTH K&B Micro-Balloons FILLER K&B SUPER POSY RESIN K&B SUPER POSY THINNER K&B SUPER POSY PRIMERI&B SUPER POSY PAINT K&R MIXING CUPS removed plans should pre-beveled before assembly ease carving have small homemade 9-in disc sander powered old washing machine motor ideal types oper ations also ideal facing off front fuselage prior adding 3A2 ply wood firewall laminates can ep oxied place after drilling mounting holes installation blind nuts retain engine mount mount attached front end fuselage carved sanded desired shape groove bent 3A2 piano wire skid can carved front firewall appropriate router held Dremel Moto Tool vertical fin added next ce mented together over plans four separate pieces /e sheet balsa lower skid portion being selected hard stock basswood would also okay skid portion After fin attached fuselage Vie sheet doubler Vie ply stab mount added entire assembly ready finish sanding point engine mount skid fuel timer should temporarily assembled along completed stab approxi mately locate all-important CG longitudinal point should marked sides fuselage box fuse lage laid its side over plans check fore aft relationship balance point marked pylon detail Should resultant balance point align itself such front edge yet-to-be-fabricated pylon would protrude forward fire wall leading edge pylon can angled rearward its base modified per plans trapezoidal pylon keel built over plans proper allowances necessary adjustment leading edge just stated left side contour parts PA PB slanting vertical 3A2 X Vie 2 sq strips can cemented place keel secured over plans right side parts may added after assembly removed plans After finishsanding pylon framework symmetri cal shape planked Vie balsa sheet grain running parallel slanted uprights Following proper trimming 172 Model Aviation HIGu QUALITY FOAM WING CORES AND CUSTOM FOAM CUTTING finish-sanding 3A2 sheet wing platform securely cemented top pylon left now determine exact CO location parts accesso ries assembled proper position pylon permanently cemented top fuselage box have often asked have ever pylon separate fuselage using method can say have used built-up pylon feature its simple direct cement attachment method about 12 years have yet have failure course attachment should made either epoxy cya noacrylate such Super T cellulose cement might too reliable application cover fuselages colored tissue silkspan using nitrate dope After few coats dope fog thin coat clear K&B Super Poxy usually will add heav ier color coating Super Poxy around engine pylon areas ward off fuel prob lems well add bit contrasting color model other accessories pretty much self-explanatory experienced modelers will incorporate own pet tachments anyway An auto-rudder corporated prototype model feature omitted subsequent deemed unnecessary model seems have plenty speed termina tion engine run coast flat right-right glide pattern aid automatic fin-kicker completely finished Nit Wit should thoroughly checked warps proper alignment am firm believer ample pre-flight preparations prevent first flight washout possibility stab should perfectly flat free warps Both wing tips should washed-out about A6 no 3A2 left inner panel should flat right inner panel should incorporate about A6 3Az washin situations can easily attained over steamy teakettle check results repeatedly few days guarantee permanent settings rudder should warped no about 2 right compensate right wing washin engine should mounted about /2 degree left sidethrust Run engine number times en sure initial timer setting about 3 sec doesnt sound like much model will get away quickly after launch initial test hop made prop frontwards engine leaned out am firm advocate vertical launch theory assumes model trimmed no drastic warps kind launched vertically almost model will travel directly away ground should have tendency little out trim will take time 3 sec turn around come back least hard ground moves much further away faster rate vertical launch old ignition-era low angle-of-attack-type launches used years An other argument since ultimate launch angle will about 800 ground way waste time submit backward-mounted broken props beginning near-horizontal low power trimming procedure gradually moving up eventual contest launch mode can just point model straight up engine screaming 3-sec test hop get scary agony over hurry certainly sounds simple anyway doesnt Speaking agony point shall volunteer relieve further claims testimonials contest potential Nit Wit design has enjoy able hope may find just enjoyable well See downwind Electrics/Kopski Continued oaoe 82 prop unloads flight motor cur rent decreases perhaps 10-15% cooling air flows motor battery youve applied what youve read series Most importantly power infor mation given directly applicable various rules thumb given previously Basically two limitations recognize determining quit pushing some motor current limi May1984 173 HobbypoxySt selei colors tallics h finishing flat can spray productstthobby close Whether model wood metal fiberglass plastic combina tion whether flies sails rolls Hobbypoxy formulated let paint build repair pamper perfection HOBBYPOXY PRODUCTS division Pettit Paint Company Inc 10 Pine Street Box 378 Rockaway NJ 07866-0378 IC1 big FREE offer Send complete literature howto-guide well tell qualify time get acquainted offer $475 worth Hobbypoxy products abso lutely FREE
Edition: Model Aviation - 1984/05
Page Numbers: 74, 75, 76, 78, 171, 172, 173
Occupying seat honor late-model version wing stab covering lightweight Coverite Micafilm Black lettering wing inexpensive stick-on vinyl found stationery department large drugstores like Its state art model Category Ill sites ACTIVE FF GAS enthusiasts reside east Mississippi River certainly aware seemingly endless struggle recent years obtain retain suitable fly ing sites competitions Large sites have become extinct currently available much closer small field variety Some years ago AMA Contest Board recognized need tailor Free Flight competitions according size flying field Categories II LII re sulted special engine run flight time limits separate National Rec ord tally kept three cate gones Whether intended action cer tainly instilled renewed vigor throughout Free Flight community opportunity win contest set national record same time small-field situation provided basis additional incentive enthusiasm three-category system gave small-site contestant chance make record books againa feat become increasingly difficult smaller sites east Big Muddy Smallfield competitors able convert assumed handicap definite challenge Category III contests eventually sumed character own case point am familiar succession contests WrightPatterson AFE Dayton OH following 1976 AMA Nats affair opened previously-unavailable old Wright Field area clubs weekend competitions given days little wind drift site could sustain Category II activity However since high fences enclose historic air base virtually unscaleable four area FF clubs sponsored meets chose 2-mm Category III limits long series contest providing steady diet 5-sec engine run 2-mm max limitson superb flying site four different area clubs sponsoring contests same field near monthly basis rather simple task track progress contestants attacking 5-sec 2-mm challenge time couple flying seasons passed W-P contestants beginning get good grip 5 2 limits unusual endure marathon run ning double digits flyoff flights determine winner course model design engine combinations taking interesting trend Simply adding power existing models such Schnuerle-ported engines necessarily ultimate answer Total model weight deemed important factor attempting squeeze 2 mm flight time out 5-sec engine run Schnuerles although quite powerful also quite heavy spring 1979 lightweight models built around lightweight engines ginning show considerable promise Two initial success stories Gib Robbins superlight rear-finned 320 sq Satellite powered Cox TD 09 Gil Morris early Toothpicks series using light weight Fox engines Gibs model parThe inception several years ago FF Power model rules smaller fields 5-sec engine run 2-mm max required some new thinking avoid being also-ran model Class B has shown its worth under conditionsE Harry Murphy 74 Model Aviation inimitable tongue-In-cheek way Harry Mur phy says Note arrow pointing directly real Nit Wit i great model designer/f puts together witty CIA former newsletter plc Joe Guyias shot Wright Fieid ticularly significant first con sistent lightweight combination begin edging previously-dominant FAI Power entries out Class trophy lines culminated winning Class 1979 Lincoln Nats Category III contest effort curb marathon flyoff situation 1980 rules changed trim Category III flyoff engine run 4 sec after fifth max change eliminated FAI Power model con tention found too heavy glide 2 mm 4-sec engine run 1980 Nats W-P proved Wright Field regulars up task fact first-place trophies Power events taken back across Mis sissippi Ralph Prey years has voiced opin ion have use super-hot engine ensure competitive engine/model combo has often stated building proper model around engine regardless its comparative power can produce very satisfactory results philosophy cer tainly applicable successful presentday Category III models Surrendering old adage cant beat emjoin em Nit Wit came about during spring 1980 completed just time 1980 Day ton Nats intention create smaller-than-normal model would speedy enough reach same altitude 4 sec previous years bigger model reached 5 sec single second may appear very significant 20% right off top power pattern small model would also require very light weight engine total model weight kept minimum would advantageous simply build smaller model total weight also re duced altitude attained power burst could sustained glide remaining 116 sec can very long time glide model leaves something desired After weighing Class en gines lightest far old Cox TD 15 4'4 oz selected first Nit Wit combo its optimistic pilot went 1980 Nats hoping capture marbles Class first three official flights produced three maxes trotted downwind retrieve model third max feeling pretty good about new design However model dethermalized onto rear bumper parked van knocking off engine front fuselage Since insufficient time make appropriate re pairs hurriedly put Cox TD 051 same Lunar-Tic 240 won event previous dayand eventually chugged fourth place spectacular beginning con vinced design would provide lot enjoyment future sure joy fly Since old Cox bit cranky occasion some engine parts difficult obtain stepped up Super tigre G 15 repaired fuselage dur ing following winter power plant switch cost over ounce weight pen alty power increase con siderable First flights using variety 7-4 wood fiberglass props indicated design could really handle excessive power subsequent flights made ST G15/19 special Doc Anderson ST G 15/23 23 piston cylinder crammed GLS crankcase Once trimmed desired power groove design appeared very forgiving changes engine prototype Class model proving excellent test bed subsequent models same size possible scaled-up versions larger FF Power classes After repairing original Nit Wit also crash-built larger version dubbed Dim-Wit prior 1982 Nats fortunate win Class D Lincoln also Category III affair model created same thoughts mind size weight kept minimum Dim Wit 535 sq model weigh ing 26 oz sporting OS Chamberlain 42 can certainly raise few eyebrows faces friendly competitors can state Class D entry weighs 26 ounces particular lightweight engine brainJim Waistons camera caught Nit Wit split second after launch Jim ribs Harry about basketball launchsays looks Harry practicing set shot ship moves child fellow CIA Club member Mere dith Chamberlain first take ad vantage discovery bore current OS Max 40 bit larger bore previous OS Max-H mod els Should mix up parts can produce very reputable engine teresting displacement 42 cu article supposed centered Class design purpose mentioning parallel point out superlight engine/model theory appears work well other clsses Category III com petition well Also incorporation awesome power Schnuerle engine isnt absolutely necessary Anyway think small guysand think lightweight engines well airframes have made large issue select ing lightweight engine maybe would help list some readily avail able engines approximate weights aid eventual engine selection Class OS Max 15 CoxTD 15 OS Max 20 Rossi 15 Fox 19 ST GiS ST G15/19 Class B OS Max 25 ST G20/23 some engines can readily mounted radially could eliminate mount altogether save another ounce up-front weightsomething may wish consider arriving eventual choice Construction Ideally completed model should balance desired CG location addition extra weight either end fuselage achieve recommended wing stabilizer completely finished before work fuselage progresses very far will per mit continual checking CG up final permanent attachment wing pylon atop fuselage box wing pylon final item fabricated Nit Wit particularly difficult model construct begin ners model shall assume may interested details its construction also beginners fore shall attempt refrain taxing integrity experienced modelers supeffluous explanation pins placed Also least cyanoacrylate vendors suggests construction methods pins am pin man myself certainly wish accused being old fashioned recognizing progress apparent Wing stab very difficult start explaining construction wing panel Ounces Grams beginning immortal 415118words Pin leading edge plans 425120Anyway whatever pet procedurebe 55156it pins 3M poster cement concrete 55156blockthe LE notched TE 56158inner wing panels have properly lo 56158cated plans fastened securely 56158place TE wing tip panels simply 55156standard 3A6 X /s tapered stock 58165front edges cut away diagonal resulting natural taper thickness wing tip Continued page 171 Note plan suggests commercial engine mount incorporated However Left no-nonsense rear end shows auto-rudder dethermalizer setup well famous logo Central Indiana Aeromodelers Actually author doesnt currently use auto-rudder function Right business end prototype model sports Supertigre G15 aluminum Tatone mount timer really modified K-Mart camera timer behind AA Tatone flood-off faceplate additional trigger mechanism auto-rudder later deemed unnecessary Note T-fitting flood-off line top engine intake shoots enough fuel intake stop engine dumps rest fuel away model 76 Model Aviation Theres OS Max 25 plain-bearing engine front end photograph Although about 65% larger displacement usual Supertigre GiS power plant model actually couple grams lighter goes show versatility possible considering lightweight engines smaller-than-normal competition FF Power models U THIS INSTALLMENT ON planes fly ing will attempt present something has missing up now much power goes what motor prop bat tery combine suitable model installment will brings series together long promised taken previous parts should assured first-time continuing Electric successwith under standing Thats what call Electric Elation time let repeat something said beginning often difficult impossible have first-hand familiarity everything means best ne picture anove ny uus urumer ana tne smaller below Dy Hera Durks Show parts ot slight line recent electric Fly events put Keystone RC Club large variety highly successful Electrics speaks well form power Only sounds fun audible lettering must still legible soft brush remove eraser residue nice have simply have have good pencil sharpener handy times should using fairly soft pencil about No 2 lead order get lines dark enough reproduction blueprint machine soft pencils should resharpened after few lines Mechanical drafting pencils extendable leads reasonably inexpensive much easier sharpen wooden counterparts last impor tant item good source light either natural artificial Now youve got paper taped drawing board light ruler hand freshly sharpened pencil other Now what First put down pencil put down ruler Before draw have determine two important prerequisites well-drawn nicelyexecuted design what going draw going draw suggest before attempt put design paper graphic form first have paper mathematicallyrepresented form Ive included column copy standard New Design Data Sheet sheet have included parameters feel important either affecting performance com pleted aircraft and/or necessary trans lating numbers construction plan significance parame ters insofar aircraft performance con cerned want deal strictly necessary making drawing now Start wing minimum will have have determined desired span area length root tip chords flap size specifications airfoil terms thick location high point both tip root An additional parameter data sheethut should beis leading edge radius LER Simply put LER circle drawn leading edge airfoil determines relative sharpness bluntness airfoil Lastly should determine planform shape wing ie straight-taper elliptical constant-chord swept forward back etc helpful hint straight-tapered wings straight flap hinge lines easiest build fly best mans opinion whos Now repeat above measurements stab elevator Span area pro portion total area primary concerns Tail thickness still subject jury out personal feel ings have changed preferring rather thick tails belief should thin possible given need structural rigidity Since primary function fuselage simply hold engine keep wing tail proper relationship other few numbers significant long nose going will put wing will put tail Again feel great deal significance what numbers articles purposes Ill leave own opinions save another time Suffice say will have decide parameters before can commit paper Now have good idea what airplane will look like aerodynamically can go back drawing board trans late numbers picture airplane concluded next month Photos comments news about Stunt should addressed Ted Fan cher 158 Flying Cloud Isle Foster City CA 94409 Nit Wit/Murphy Continued oaoe 76 itself bottom spars secured posi tion next ribs turn ce mented securely place locations shown Obviously hold off putting ribs dihedral joints until panels joined Vs sq top spar airfoil high point should cemented place time aid retaining proper alignment ribs panels removed plan easier add 3A2 X /g turbulators rear top spar after panels attached together probably good idea add 6 X 42 diagonal braces 3-FUNCTION ACCUETACH ITM O LCD Tachometer w/dual scale capability lOX lOOX Digital Voltmeter or load /56 checking/cycling TX/RX battery combos ACCU-1Clfl quick @ chargug operation 79 prepaid Nor money order Calif add 6% tax 94086 AVIONI NCSunnyva CA May 1984 171 LEOS LASER *JR STICK World Aerobatic Champion Ideal Trainer Top Quality Epoxy Gloss Pane atstaad,9 lois. & Foam Kt logo Cowl & Wheel Pants ia0 Span Waq Area 1050 .q n iava Laediag Gw Foam Wing90 Span Wing oe Annembly Time Area 1440 sq inches it 5 -12 lb. Balsa Fnsh Ks tagine Si., 75 13 Complete Stop Step In-95 struct ens m th P ctarest7 ght 16 20 lbst$PISHIPPING Lag 2 4 HPDirect Sales Only 9995READYMAR84 PLUS $1 SHIPPINGCap 20 & Cap 21 DirectSales Onifor 60- 12 engines facturers Quality Kits Large Scale Engines RO Un iv Canton OH 44707 Phone 216 4846810 484-4374 Tired Being Shot Down SUPER SERVO GARD Controls Throttle Cant * Constantly monitors receiver interference another trans mitter outside sources instantly reducing throttle idle until interference clears * Constantly monitors flight battery pack voltage instantly reduces throttle idle allowing time safely land * Responds instantly lose radio signal throttling back idle alerting flight problem * Affects throttle giving complete control other servos safe landing * Minimizes crash damage caused signal loss ending full force smash-ups Endorsed IMAAShew Team required shew nsodoi ii v1 SPECIFICATIONS Size KPS 1411 Servo Case Power 17 ma Volt CutOut Point 46 volts Pulse Width Range Adi 0628 milliseconds Systems 3 4 wire Temp Range 00 1400F Weight 12 oz Price $4795 Postpaid Specify connecter type posItIve er negatIve pulse ordering RaFa Enterprises 106 N Main St. Arlington OH 45814 419 365-5066 have large selection wing cores available stock Custom foam cutting reasonable prices Foam blocks nichrome wire special needs Wire $40025 feet 2040 60 size floats $1295 Months Special Sweet Stick AND Sweet Lo Stick Wings Only $900 Information Prices Contact Bee. Slit Aeremollel Eg neetq 21 Joe. Drive West Wwwick RI 02893 call 4011 525-68 3 P ease add $3 sh p Er Hand Foam its flest Deal flest THE NEWEST MOTOR FROM Fox AMERICAS LARGEST INDEPENDENT MANUFACTURER OF MODEL AIRPLANE PRODUCTS pox io BB Bore 650 Stroke600 Displacement199 RPM 84 prop . 17000 Weight81/4 OZ Fuel Consumption 4 oz mm Schneurle porting course rugged parts lots power good idle unique design feature upper cylinder casting can turned exhaust either side back rear exhaust installations Structurally Pox i9BB peer crankshaft made aircraft quality 8620 steel supported two 11mm ball bearings con rod bushed piston fully machined mehanite runs leaded steel liner 22000 Fox 19BBRC$5995 90219 Tiltdown Muffler1495 90220 Tiltup Muffler1495 50203 Motor Mount800 Fox MFG CO 5305 TOWOON AVEFORT SMITH ARK 72901 15011 646-1656 panel secured flat workbench aid preventing inherent warpage panels leave plans diagonals should omitted airfoil quite thin internal bracing necessary anti-warp considerations permanent assembly four indi vidual wing panels other same other wing Make sure mating ends properly beveled panel properly aligned plan view along respective 4-in polyhedral 1-in dihedral being incorporated Add A2 ply joint braces proper gussets indicated After constructing wing will find stab construction much same plans quite self-explanatory Both wing stab should sanded prepared covering favorite covering materialpreferably good tensile strength original model covered silkspan appropriately doped Randolph butyrate com bination gave great strength thin airfoil However found silkspan gradually absorbed fuel causing models weight slowly increase subsequent models have switched Coverites lightweight white Micafilm can claim excellent re sults materialboth its fuel proof skin stress properties Fuselage Parallel-sided profile-type fuse lages certainly very original nor fat balsa box alternatives Nit Wit incorporates interesting combination narrow tapering balsa box engine mount cheeks make rather pleasing silhouette both side plan views selection 3A2 balsa sheet fuselage top important should firm C-grain stock will become back bone fuselage pylon attached fuselage built upside down over plans rectangular-shaped /16 sheet formers cemented place loca tions shown /e sheet sides sembled next sure add /2-in tri angular balsa blocks four inside corners forward compartment before Ae sheet bottom attached /4-in sheet balsa cheeks can added after box Matched Performance System TOP PERFORMANCE K&B ENGINES Airplane 4 Marine K&B FUELS$&B GLOW PLUGS 7 Blends4 choices Matched Finish System BEST APPEARANCE K&B FIBERGLASS CLOTH K&B Micro-Balloons FILLER K&B SUPER POSY RESIN K&B SUPER POSY THINNER K&B SUPER POSY PRIMERI&B SUPER POSY PAINT K&R MIXING CUPS removed plans should pre-beveled before assembly ease carving have small homemade 9-in disc sander powered old washing machine motor ideal types oper ations also ideal facing off front fuselage prior adding 3A2 ply wood firewall laminates can ep oxied place after drilling mounting holes installation blind nuts retain engine mount mount attached front end fuselage carved sanded desired shape groove bent 3A2 piano wire skid can carved front firewall appropriate router held Dremel Moto Tool vertical fin added next ce mented together over plans four separate pieces /e sheet balsa lower skid portion being selected hard stock basswood would also okay skid portion After fin attached fuselage Vie sheet doubler Vie ply stab mount added entire assembly ready finish sanding point engine mount skid fuel timer should temporarily assembled along completed stab approxi mately locate all-important CG longitudinal point should marked sides fuselage box fuse lage laid its side over plans check fore aft relationship balance point marked pylon detail Should resultant balance point align itself such front edge yet-to-be-fabricated pylon would protrude forward fire wall leading edge pylon can angled rearward its base modified per plans trapezoidal pylon keel built over plans proper allowances necessary adjustment leading edge just stated left side contour parts PA PB slanting vertical 3A2 X Vie 2 sq strips can cemented place keel secured over plans right side parts may added after assembly removed plans After finishsanding pylon framework symmetri cal shape planked Vie balsa sheet grain running parallel slanted uprights Following proper trimming 172 Model Aviation HIGu QUALITY FOAM WING CORES AND CUSTOM FOAM CUTTING finish-sanding 3A2 sheet wing platform securely cemented top pylon left now determine exact CO location parts accesso ries assembled proper position pylon permanently cemented top fuselage box have often asked have ever pylon separate fuselage using method can say have used built-up pylon feature its simple direct cement attachment method about 12 years have yet have failure course attachment should made either epoxy cya noacrylate such Super T cellulose cement might too reliable application cover fuselages colored tissue silkspan using nitrate dope After few coats dope fog thin coat clear K&B Super Poxy usually will add heav ier color coating Super Poxy around engine pylon areas ward off fuel prob lems well add bit contrasting color model other accessories pretty much self-explanatory experienced modelers will incorporate own pet tachments anyway An auto-rudder corporated prototype model feature omitted subsequent deemed unnecessary model seems have plenty speed termina tion engine run coast flat right-right glide pattern aid automatic fin-kicker completely finished Nit Wit should thoroughly checked warps proper alignment am firm believer ample pre-flight preparations prevent first flight washout possibility stab should perfectly flat free warps Both wing tips should washed-out about A6 no 3A2 left inner panel should flat right inner panel should incorporate about A6 3Az washin situations can easily attained over steamy teakettle check results repeatedly few days guarantee permanent settings rudder should warped no about 2 right compensate right wing washin engine should mounted about /2 degree left sidethrust Run engine number times en sure initial timer setting about 3 sec doesnt sound like much model will get away quickly after launch initial test hop made prop frontwards engine leaned out am firm advocate vertical launch theory assumes model trimmed no drastic warps kind launched vertically almost model will travel directly away ground should have tendency little out trim will take time 3 sec turn around come back least hard ground moves much further away faster rate vertical launch old ignition-era low angle-of-attack-type launches used years An other argument since ultimate launch angle will about 800 ground way waste time submit backward-mounted broken props beginning near-horizontal low power trimming procedure gradually moving up eventual contest launch mode can just point model straight up engine screaming 3-sec test hop get scary agony over hurry certainly sounds simple anyway doesnt Speaking agony point shall volunteer relieve further claims testimonials contest potential Nit Wit design has enjoy able hope may find just enjoyable well See downwind Electrics/Kopski Continued oaoe 82 prop unloads flight motor cur rent decreases perhaps 10-15% cooling air flows motor battery youve applied what youve read series Most importantly power infor mation given directly applicable various rules thumb given previously Basically two limitations recognize determining quit pushing some motor current limi May1984 173 HobbypoxySt selei colors tallics h finishing flat can spray productstthobby close Whether model wood metal fiberglass plastic combina tion whether flies sails rolls Hobbypoxy formulated let paint build repair pamper perfection HOBBYPOXY PRODUCTS division Pettit Paint Company Inc 10 Pine Street Box 378 Rockaway NJ 07866-0378 IC1 big FREE offer Send complete literature howto-guide well tell qualify time get acquainted offer $475 worth Hobbypoxy products 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