Control Line Aerobatics Ted Fancher think youre seeing double month youre almost right two Con trol Line Aerobatics columns time Its because Ted Fancher regular contributing editor subject has expounding things dear heart Al Rabe special con tributor month Both modelers acknowledged experts subject both cling certain beliefs about aerodynamic facts IWe spe cialized type model agreement Whos right MA editorial staff doesnt know have agreed publish Al Rabes thoughts follow interested modeler can read judge himseW/herself Also Al has something say about tail-first designs may set thinking THIS COLUMN being written because Ted Fancher has talking about P factor gyroscopic precession want lay topics rest Im addressing issue time because Ted misquoted columns Now feel important insofar readers Teds column actually incorporate some ideas design and/or construction airplanes hope having nicer-flying craft greater competitive success example few Stunt fliers have tried such things shock-absorbing landing gears significant dihedral movable rudders airplanes have installed bellcranks upside down nearly everyone uses sliding-block/slot ted-wing-tip adjustable lead-out guides idea originated 1968 first published Bearcat construction article 1970 decide features going incorporate new Stunt ship have right evaluate best available information accurately present ed isnt important whether agree Ted differences over P-factor precession long interested receive fair presentation tried present ideas article CL Stunt Design January 1985 issue Model Aviation tried present clearly accurately think Stunt fliers understood ideas until Ted paraphrased substi tuted expression turn obvi ously meant lift certainly no intention suggesting .an air plane would turn ever changing its geometric angle attack Neither did suggest .. lift causes aircraft body angle change Quite contrary RELATIVE 9 WIND F&OATTACK RELATIVE WIND ALTHOUGH WING APPROACHES STALL ASCENDING BLADE. AND DESCENDING BLADE NEAR ThE SAME ANGLE TO THE RELATIVE WIND AND THEREFORE NEAR EQUAL THRUST WITh UTTLE iW Al Rabe discussed two sketches article January 1985 Issue Above Ted Fancher picked up discussion used other drawing Below April 1985 issue After Al Rabe took exception Fanchers remarks so. read AOJA THIS FORCE MUST BE OVERCOME BY THE TAIL BEFORE THE A/C CAN PITCH NOSE UP 4 OG -4 PITCHING MOMENT 5OLBSXI-I/2zz75iNCH/LBS NOSE DOWN simply said necessary change body angle create lift Perhaps will understandable elaborate what think Teds elaboration drawing January article Lets see now Teds drawing April 1985 issue page 67 suggests agrees possible generate 50 pounds lift changing effective angle attack means deflecting flaps necessarily changing body anglebut creating strong nose-down pitching moment near cen ter gravity CG Actually exactly point saw no need compli cate matters farther discussion pitching moments Further atno point did relate lift turn except point out maximum maneuvering ie turning angle attack would reached about same body angle relative wind slow-speed landing body angle illustrate lets add some hypo thetical numbers dimensions Teds April drawing Lets think 50 lb lift apparent 16 Gs 5O-oz Stunt ship sake sweet reason Ill stipulate center lift indeed 1 behind CG does creat 75 in-lb nose-down pitching moment Now lets add horizontal tall surfaces having center lift point say 25 aft aircraft CG controlled flap deflection caused 50 lb lift matched up-elevator deflec tion caused 3-lb download tail 3 lb times 25 results 75 in-lb nose-up moment balancing exactly flaps 75 in-lb nose-down moment result airplane climbs absolutely flat no body angle should point out 3-lb download real weight must carried wings Thus actual effective weight carried wing instant would 98 oz achieved vertical accelera Continued page 160 June 1985 71 50 LBS LIFT ASCENDING BLADE HALLOW ANGLE TO WIND PRODUCING LESS THRUST DESCENDING BLADE TEEP ANGLE TO RELATIVE WIND PRODUCING MORE THRUST AND STRONG LEFT YAW Model Magic Epoxy Plus 2 Part 8 Mm Use anywhere two part epoxy used 25% Lighter Sandable Carveable Excellent Gap Filling Non-Sagging Superior Strength $fl95 Sands Carves like Basswood l 16 81 oz Equal over 8 wt oz regular epoxys See dealer first write call PO Box 19784 St Paul MN 55119 715 425-1397 MODEL MAGIC PRODUCTS 0 Model Magic Filler 0 0 S S Comparison Chart Model Magic Product X Adhesion BalsaEacellent Foam Fiberglasa Strength Flesing Spreading FuelResistance SandingAs med balsa HardnessAs hard balsa FinishingAny finish/covering Shelf Lifetill used up TintAcceptanceExcellent water ResistExcellent 0 very Poor Soft balsa Soft balsa 5-7 inn very Poor Test methods data available request care enough fill very best insist Model Magic Filler Circtie Manic Filler r Super sport flier turnaround pattern esisa Construction 70 span 927 sq area $1 j 759859 lbs 75-12cu Dealer Inquiry Invited 3405 Cleveland Ave SW Canton OH 44707 Send $1 Catalog 1216 4846810 mm~~ROUSH MFG 31-lllllrlb S HANDLING Up $999 add $199 $891 $2909 add $229 $2901 $9590 add $300 $9591 $7099 add $309 over $7909 add $9 001 CA Addressees add 69 tax Send MO visa/McI#Exp Check lallow up 30 days CK clearancel COD Exact Charges plus $159 Hdl ICash Only 84 Page CATALE*uu*S $209 PP/tnt Class espy will oent free--when requested-with order HOBBY HORN 15173 Moran St [A] PO Box 2212 Westminster Ca 92699 1719 8938311 [Aft Nm 719 8951203] 160 Model Aviation Still own opinion flaps have strong effect tracking Particu larly influential spanwise distribu tion As flaps get shorter tracking suf fers Flaps should long span nar row chord Rule Thumb Fancher Flaps should full-span nearly chord should range 15% 20% wing chord depending air craft weight addition hingeline should straight Since Stunter flies constant left skid straight hingeline assures airflow across airfoil consistent possible entire span final design objective Uniformity Turn pitch prime design factor Decalage Decalage fancy term alignment wing tail blunt should no decalage Stunter centerlines wing tail matter thrust line must parallel Any misalignment of either design construc tion will result plane turns dif ferently inside versus outside Dont Secondarily aware locate large draggy parts airplane Uneven vertical distribution drag relative CG will result unequal turns No rules thumb must eyeball side view make educated guess drag distribution same goes drags opposite number thrust Dont mount engine pylon above tail expect ship turn well inside about winds up design phase Next month well preflight get started flying Ted Fancher 158 Flying Cloud Isle Foster City CA 94404 gles Does mean surrender quite As Ted correctly pointed out ineffective tail surfaces elevator pushrod discon nected will cause violent nose-down response up-elevator down-flap control reversed control vengeance extreme deflected flaps create 75 in-lb nose-down mo ment tail surfaces produce 28 lb download 70 in-lb nose-up moment due elevators too small size too little deflection result will still reversed controls violently same flap deflection stronger tail surfaces produced 32-lb download 80 in-lb nose-up moment result would positive nose-up rotation response up-control application Lets put together have Stunt ship wing-bending load 50 lb 3-az change tail download causes turn Its opinion real work situation high ljfl required oppose high 0-loads tight corner Relatively little effort ex pended change body angle relatively little change body angle required airplane turn sharply Once again maneuvering body angle maximum loads should approximate body angle slow-speed stall case full-flap Stunt ship observe body angle such case slight thus insignificant pitchinsignificant P-factor statement does did read No pitchno P simply signs real effects P recognized addressed less importance effect precession applica tion full-flap Stunt ships summarize did suggest _______________________________.. aircr. can make abrupt pitch change. achieving posi CL Aerobatics/Rabetive geometrical angle attack. . did Continued page 71add sufficient proper accurate modi tion would closer 8 Gsfiers various statements such such airplane configuration .dramatically reduce body angle relative wind. t ships possible Id first admit its usually have small body angles land performance would akin stall little nose-up pitch elevator Stunt ship An air- statements flatly suggest plane would incapable Stunt pattern withit positive negative body an- Continued page 162 tilt $595 081 ozl taluezs t,eng Kepair Timer LaNtus 8 Gus axOEL c/I/todd Elt7LcL 9mm IREaKEr -tell eROOKLYN DOOcER 59 cabin WEST Retail $52 95*aINTRoDucToRY PRICE $3909 t930 Recerd Breaker 96 $6956 t939Zipper59$5356 t939 Kioud King 63 $4236 1991 Brigidier 56 $4976 t991 Super Ouaker 79 $7776 1940 So Long 5tS3936 t936 Buccaneer 09 $5996 1938 clipper MKI 72$ill56 1937 Dallaire tOt $7516 t93t Miss America 89 $7196 t991 Playboy Sr 50 $5116 1991 Playboy Jr 59 $3119 1938 Powerhouse 89 $5356 1990 Sailplane 78 $9976 1938 Trenton Terror 72 $9076 1990 Ranger 96$3t 96 1939 Korda Wake 99 $t916 1939 Mercury 72 6 kits qualify SAM events 1FF & RId feature highest quality machine cut & sanded parts Superior competition alt sheet atrip wood wire & window material Plans orig PP models easily convertible 3ch RIC KITS Sailpianes Electric power cas Hobby Horn SENSOAR Clider 78 9sl $1800 Midway Model GNOME RIC Hand Launch Glider$2900 Jolly Models FLINcER RIC HLG 50 Span $2990 Midway Model FAST EDDIE Aerobatic /09 Elec$t990 Jolly Models ELECTRIcUS Electric Clider 95s$3259 Leisure PLAYBOY SR 67 cear 95 Elect $3900 Astro ASTRO SPORT 37 Direct 99 Elect $2290 Leisure WASP 37 far Direct 95 Electrics $2250 Midway ULTRA MK iv 86 far Geared 09 EP $3999 Midway FLYING QUAKER 89 90-959 strake $6976 9ks/Midway DENNY JR 72 Alum camel $9396 9ks/Midwav BUZZARD BOMBSHELL 72$5196 FULL LINE OF ELECTRIC SYSTEMS 9 Parts Avail OTS TS RIOR TS T THE MOST SUPERIOR PILOT FIGURE ON THE MARKET LIGHTEST WEIGHT MOST REALISTIC AVAILABLE GIVE YOUR PLANE PILOT FOR YOUR NEWEST OLDEST OR NEXT CREATION R YOURS TODAY FULL FIGURES CIVILIANWWII MILITARY 1/3 Scale$19951/5 Navy$1395 1/4Scale14951/6AAF1195 1/5 Scale1295Plus 1/12 Scale895$250shipping 1/12Chopper 895each figure KNIGHTS OF THE AIR 7148 Lasting Light Way Columbia MD 21045 301-730-5596 SAVE UP TO 50% famous-make tools hard-to-find items FREE GIFTS valued 514 95 order OVER 1000 ITEMS fully guaranteed MICROMARK Box 5112-6324 E Main St Clinton NJ 08809 DYES Please rush big new catalogI youve ordered us before no need II Well send new cata og automaticallyI NAMEj ADDRESSI CITY __________________ STATE ______ ZIP _________ NewI MK II H & K Superstarters Q-35$2495 Q-50$2495 MAG II$3495 Super Hustler$3495 Zenoah$2495 Tartan Twin$3995 Roper 37$2495 90 Day Warranty need positive pitch minimal full-flap Stunt ship case some appropriate short having studied Teds rebuttle answered am persuaded changing word article either necessary appropriate Finally Ted correctly said am convinced conventional Stunt ships have less tension flying outside ma neuvers flying inside ones didnt arrive conviction assuming break dancing body positions ing mythical Outside Triangles simple observation anyone can make airplane directly downwind climbing vertically below 450 center traditional Square Eight would pull harder applied up-control 45 applied down-control simple test will divide Stunt fliers Preces sers P-ers Ted have both pointed out now conventionally-configured airplanes stab brings up rear require download tail stability Full-size airplanes carefully designed safe stable minimum payload-destroying download Since jet fuel costs went out sight dont just load 727s within approved CG range longernow try load within economy range GO roughly rear half approved range Id guess full-size conventional aircraft probably carry 3%ZENOAN QUARTZ CUSTOM Dual outlet aluminum muffler Carb rotated needle accessibility cowled Modified Quadra mount 6 bolt prop washer carb linkage 4 Complete assembled shoWn $14495 1516495 wIsuperearterI 5% less payload say flying wing same gross weight wing area Efficiency-wise Stunt ships another class entirely First build superstable airplanes grooooove placing CG balance point much farther ward necessary normal stable flight use large full-span flaps obtain high lift sharp corners coupled flaps create both high lift strong negative pitching moments Without quite knowing build airplanes super-effective stabs powerful elevators practical way lever Stunt ships out grooves sharp turns overcome terrific negative pitching moment full-span flaps arbitrary numbers Ted played around probably overstated case However doubt pay large penalty lost payload capability corresponds reduction G pulling capacity Stunt ships Id guess loss 20%-25% range airplanes high wing loadings big stiff flapsand somewhat less lightly-loaded classics smaller flaps less flap travel suffer real loss potential performance less equally no competitive disadvantage until some sharpie comes along canard stab front well-enough designed pret ty enough overcome judges natural bias against non-conforming airplanes guy just might blow doors off see unlike conventional airplanes stab stable canard actually carries part weight level high-G maneuvering flight canard doesnt suffer penalty downloaded stab gains bonus performance uploaded stab As result canard can carry weight have smaller wing turn tighter Look around guys still flying Fifties technology new age canard flying wing efficiency Interesting efficient new flying machines abound latest bomber Stealth reported flying wing Lockheed has proposed super-efficient canard airliner Nine ties business aviation Beech Star ship Avtec 400 Omacs Laser 300 flying now canards military 162 Model Aviation PK PRODUCTS Specializing Quadra/Zenoah Sales Service PO Box 6226 Hayward CA 94540Tel 415 581 -4277 Eves DEALER INQUIRES INVITED ALL ORDERS ADD $200 POSTAGE & HANDLING CALIF RES ADD SALES TAX viation Northrup X-29A anard has swept-forward wings iell general aviation Burt Rutans opular homebuilt Vari-Eze round-the-world Voyager both Ca ards signs canards will ome Stunt Ls inevitable radical new configurations nay can already see some problems 4th practical developmentand naybe solution First lets look flying wings Pre ision Aerobatics Flapless Combat-ship ke airplanes can never slow accurate recision maneuvers elevators n flying wing deflected upward nitial effect same raising flaps n conventional Stunt ship negative downward liftand lots Next levators change pitch attitude 4ng overall increased lift itched-up wing offsets down force ie elevators sink stops though pitch 411 continue change long levators deflected desired itch attitude reached elevators re neutralized will sort pward bounce airplane elimi ation downward lift short cor ers flown flapless flying wing can ever approximate smooth radius 411 always have funny little sinks bounces Another unusual characteristic lapless flying wing demonstrated early designs semiscale 63B would take off up levator up-elevator applied ground couldnt rotate nose Lpward negative lift created sure 1ued sucker ground fly first pop loose down levator get clear ground hen follow up-elevator subsequent nore-or-less normal flight Trailing edge flaps obviously wont work mn flying wing either think Precision Stunt flying wing would possible sets flush-mounted flaps upper lower wing surfaces located near spar bottom flap would operate up-elevator provide enough lift balance sinking tendency pitch attitude changed vice versa desired pitch attitude obtained flap would retract elevators centered- Positive negative lift would disappear simultaneously bouncing wing spar-mounted flaps wouldnt efficient lift-producers trailing edge flaps should nevertheless work Actually canards will easier design fly CG will still conventionally located just ahead spar Wing design lead-out position will remain unchanged stab will moved front can probably reduced size keep normal near-spar balance point engine will probably have moved rear installed pusher configuration has aerodynamic advantages rear engine push/pull twins like Cessna Skymaster usually has greater thrust improved airflow out prop Aerodynamics will also improved removing propwash SAILPLANES WORLD iSOlA Coffee Rd Modesto CA 95355 airframe biggest problem pusher canards will probably en gine heat have troubles enough cooling Stunt engines directly prop-blasted flow Without blast cooling air supplementary cooling prob ably liquid cooling will required will tough can doneand rewards canard performance improve ment could rich will canard fly Wellllll retract-equipped twin-engined Hornet has ink lines molded-balsa P-47N fuselage finished molded-balsa P-5 lB fuselage Also have some molds finished all-glass Ultimate Spitfire guess what Im trying say personally will have trouble replacing WW II fighters strange new shapes however well may fly innovation creativity experimen tation ridiculous amount effort finally managed make semiscale Stunters fully competitive best todays conventional Stunt ships As survey situation dont believe enough unrealized performance potential left semiscale Stunters compete fully against improved aerodynamics Sailplanes International Krause MultiPlex Wan itschek Wik & Roke Sport-Scale-F3B European Hardware Accessories Send $500 Cat & Price List 209 577-0506 June 1985 163 iddreSS PAY BY CHECK OR MONEY ORDER money orders shipped same day received Send Jeffla Products PO Box 484 Lake Elsinore CA 92330 call 714 674-1151 radically new ships What heck day comes Ill just fly Sea Fury Old-Timer Stunt Al Rabe 1904 Valley Oaks Ct Irving TX 75061 CL Racing/Ballard Continued page 72 must filled tube removed fuel bulb discarded engine restarted Apparently two-andone-half seconds can saved using pressure refueler system am enclosing picture typical problem encoun tered hitting quick-fill fill pipe particular pit man using fingers left hand guide filler pipe quick-fill left hand could attaching battery resetting fuel shutoff competitor has apparently mastered situation Tim Gillott Tim utilizes pressurized fuel system similar Matched Performance system TOP PERFORMANCE K&B ENGINES 16 Airplane 4 Marne K&B FUELSK&B GLOW PLUGS 7 BlenUs4 choices Matched Finish System BEST APPEARANCE K&B FIBERGLASS CLOTH K&B Micro-Balloons FILLER K&B SUPER FOXY RESIN K&B SUPER FOXY THINNER K&R SUPER FOXY PRIMERK&B SUPER FOXY PAINT 66 MIXING CUPS used Team Race competitors uses army ammo belt pint fuel can pressurized either Coleman pump air pump such used RC retractable gear systems tube exits can rubberbanded arm female type TR fitting tank other half mounted Tims middle finger leaves thumb index finger free battery connections So essence tank can filled other two fingers can clamping engage battery leaves right hand completely free reset shutoff flip propeller no bulb needs discarded no problem entering exiting quick-fill tube no way dirt can enter system bulb rolling around ground getting dirt fuel jug area Sport Race tank modifications have several requests concerning reliable tank use Sport Race models big problems find Racers plain-bearing engines tend vibrate causing fuel-foam ing problems very sturdy front nose pod profile fuselage must utilized keep vibration minimum addition found beneficial use clear silicone caulk blue gasket sealer between profile fuselage tank dampen vibration silicone seemed unaffected high- low nitro fuels tank seems useful rectangular tank approxi mately four inches long oneand-one-half inches wide tank must mounted fuel feed tube parallel center needle valve tube needs removed tank bent fuel line tub ing can passed through fuel shutoff kinking also away heat engine Midwest Sport Race rules require A-in fill tube found fill tube worked much bet ter bent air flow tube merely enters inside tank does run back feed line might Uniflow system tube merely sticks down inside front tank bent air stream have found excellent bends can made copper brass tubing us ing Harry Higleys tube-bender vir tually eliminates kinks almost angle bend can easily accomplished transition full empty rectangular tank seems excellent Obviously larger capacity tank engine can set fairly lean fear overheating since fuel shutoff can utilized larger-capacity tank fuel pressure 30 40 laps before pit stop will allow constant needle valve setting Finally find putting tank underneath wing additional silicone damping can used vibra tion-free tank attachment possible putting silicone 6n top section tank building plywood floor particular underside wing area help dampen vibration New products have just seen three new propeller pitch gauges produced Walt Perkins Shadow Racing F IDLflULIL~ three styles Team Race Style Style II The Team Race pitch gauge measures EEUEBIE -in pitch increments designed props 8-in diameter pitches 4 8 Style props 12-in 70 cowls 9 wheelpants tar Sig Pica diameter pitches 3 15 Top-Flue Jemco Nosen Pilot Stattord Radlals BehrensGarmhausen W E Tech andutherkilsand half-pitch increments Style II plans One-piece laminated construction handlaid 24-in diameter propellers 4 14-in liberglass strong lightweight Send BASE tor pitch A-in pitch increments price list please include names models interested parts tar call between DAM -gauges lighter weight 9 PM EDT tor intormatlon COD ordering Wecompact facilitate transportation hope hear youlfield use have permanently photo IBERGLASS 703 890-6017etched scales will rub off gauges can ordered meas jU4ERure pusher props well tractor Opt MA RI Ba 530 Goodvew VA 24095 Continued page 16t 164 Model Aviation FULL LINE METAL SPECIALISTS
Edition: Model Aviation - 1985/06
Page Numbers: 71, 160, 162, 163, 164
Control Line Aerobatics Ted Fancher think youre seeing double month youre almost right two Con trol Line Aerobatics columns time Its because Ted Fancher regular contributing editor subject has expounding things dear heart Al Rabe special con tributor month Both modelers acknowledged experts subject both cling certain beliefs about aerodynamic facts IWe spe cialized type model agreement Whos right MA editorial staff doesnt know have agreed publish Al Rabes thoughts follow interested modeler can read judge himseW/herself Also Al has something say about tail-first designs may set thinking THIS COLUMN being written because Ted Fancher has talking about P factor gyroscopic precession want lay topics rest Im addressing issue time because Ted misquoted columns Now feel important insofar readers Teds column actually incorporate some ideas design and/or construction airplanes hope having nicer-flying craft greater competitive success example few Stunt fliers have tried such things shock-absorbing landing gears significant dihedral movable rudders airplanes have installed bellcranks upside down nearly everyone uses sliding-block/slot ted-wing-tip adjustable lead-out guides idea originated 1968 first published Bearcat construction article 1970 decide features going incorporate new Stunt ship have right evaluate best available information accurately present ed isnt important whether agree Ted differences over P-factor precession long interested receive fair presentation tried present ideas article CL Stunt Design January 1985 issue Model Aviation tried present clearly accurately think Stunt fliers understood ideas until Ted paraphrased substi tuted expression turn obvi ously meant lift certainly no intention suggesting .an air plane would turn ever changing its geometric angle attack Neither did suggest .. lift causes aircraft body angle change Quite contrary RELATIVE 9 WIND F&OATTACK RELATIVE WIND ALTHOUGH WING APPROACHES STALL ASCENDING BLADE. AND DESCENDING BLADE NEAR ThE SAME ANGLE TO THE RELATIVE WIND AND THEREFORE NEAR EQUAL THRUST WITh UTTLE iW Al Rabe discussed two sketches article January 1985 Issue Above Ted Fancher picked up discussion used other drawing Below April 1985 issue After Al Rabe took exception Fanchers remarks so. read AOJA THIS FORCE MUST BE OVERCOME BY THE TAIL BEFORE THE A/C CAN PITCH NOSE UP 4 OG -4 PITCHING MOMENT 5OLBSXI-I/2zz75iNCH/LBS NOSE DOWN simply said necessary change body angle create lift Perhaps will understandable elaborate what think Teds elaboration drawing January article Lets see now Teds drawing April 1985 issue page 67 suggests agrees possible generate 50 pounds lift changing effective angle attack means deflecting flaps necessarily changing body anglebut creating strong nose-down pitching moment near cen ter gravity CG Actually exactly point saw no need compli cate matters farther discussion pitching moments Further atno point did relate lift turn except point out maximum maneuvering ie turning angle attack would reached about same body angle relative wind slow-speed landing body angle illustrate lets add some hypo thetical numbers dimensions Teds April drawing Lets think 50 lb lift apparent 16 Gs 5O-oz Stunt ship sake sweet reason Ill stipulate center lift indeed 1 behind CG does creat 75 in-lb nose-down pitching moment Now lets add horizontal tall surfaces having center lift point say 25 aft aircraft CG controlled flap deflection caused 50 lb lift matched up-elevator deflec tion caused 3-lb download tail 3 lb times 25 results 75 in-lb nose-up moment balancing exactly flaps 75 in-lb nose-down moment result airplane climbs absolutely flat no body angle should point out 3-lb download real weight must carried wings Thus actual effective weight carried wing instant would 98 oz achieved vertical accelera Continued page 160 June 1985 71 50 LBS LIFT ASCENDING BLADE HALLOW ANGLE TO WIND PRODUCING LESS THRUST DESCENDING BLADE TEEP ANGLE TO RELATIVE WIND PRODUCING MORE THRUST AND STRONG LEFT YAW Model Magic Epoxy Plus 2 Part 8 Mm Use anywhere two part epoxy used 25% Lighter Sandable Carveable Excellent Gap Filling Non-Sagging Superior Strength $fl95 Sands Carves like Basswood l 16 81 oz Equal over 8 wt oz regular epoxys See dealer first write call PO Box 19784 St Paul MN 55119 715 425-1397 MODEL MAGIC PRODUCTS 0 Model Magic Filler 0 0 S S Comparison Chart Model Magic Product X Adhesion BalsaEacellent Foam Fiberglasa Strength Flesing Spreading FuelResistance SandingAs med balsa HardnessAs hard balsa FinishingAny finish/covering Shelf Lifetill used up TintAcceptanceExcellent water ResistExcellent 0 very Poor Soft balsa Soft balsa 5-7 inn very Poor Test methods data available request care enough fill very best insist Model Magic Filler Circtie Manic Filler r Super sport flier turnaround pattern esisa Construction 70 span 927 sq area $1 j 759859 lbs 75-12cu Dealer Inquiry Invited 3405 Cleveland Ave SW Canton OH 44707 Send $1 Catalog 1216 4846810 mm~~ROUSH MFG 31-lllllrlb S HANDLING Up $999 add $199 $891 $2909 add $229 $2901 $9590 add $300 $9591 $7099 add $309 over $7909 add $9 001 CA Addressees add 69 tax Send MO visa/McI#Exp Check lallow up 30 days CK clearancel COD Exact Charges plus $159 Hdl ICash Only 84 Page CATALE*uu*S $209 PP/tnt Class espy will oent free--when requested-with order HOBBY HORN 15173 Moran St [A] PO Box 2212 Westminster Ca 92699 1719 8938311 [Aft Nm 719 8951203] 160 Model Aviation Still own opinion flaps have strong effect tracking Particu larly influential spanwise distribu tion As flaps get shorter tracking suf fers Flaps should long span nar row chord Rule Thumb Fancher Flaps should full-span nearly chord should range 15% 20% wing chord depending air craft weight addition hingeline should straight Since Stunter flies constant left skid straight hingeline assures airflow across airfoil consistent possible entire span final design objective Uniformity Turn pitch prime design factor Decalage Decalage fancy term alignment wing tail blunt should no decalage Stunter centerlines wing tail matter thrust line must parallel Any misalignment of either design construc tion will result plane turns dif ferently inside versus outside Dont Secondarily aware locate large draggy parts airplane Uneven vertical distribution drag relative CG will result unequal turns No rules thumb must eyeball side view make educated guess drag distribution same goes drags opposite number thrust Dont mount engine pylon above tail expect ship turn well inside about winds up design phase Next month well preflight get started flying Ted Fancher 158 Flying Cloud Isle Foster City CA 94404 gles Does mean surrender quite As Ted correctly pointed out ineffective tail surfaces elevator pushrod discon nected will cause violent nose-down response up-elevator down-flap control reversed control vengeance extreme deflected flaps create 75 in-lb nose-down mo ment tail surfaces produce 28 lb download 70 in-lb nose-up moment due elevators too small size too little deflection result will still reversed controls violently same flap deflection stronger tail surfaces produced 32-lb download 80 in-lb nose-up moment result would positive nose-up rotation response up-control application Lets put together have Stunt ship wing-bending load 50 lb 3-az change tail download causes turn Its opinion real work situation high ljfl required oppose high 0-loads tight corner Relatively little effort ex pended change body angle relatively little change body angle required airplane turn sharply Once again maneuvering body angle maximum loads should approximate body angle slow-speed stall case full-flap Stunt ship observe body angle such case slight thus insignificant pitchinsignificant P-factor statement does did read No pitchno P simply signs real effects P recognized addressed less importance effect precession applica tion full-flap Stunt ships summarize did suggest _______________________________.. aircr. can make abrupt pitch change. achieving posi CL Aerobatics/Rabetive geometrical angle attack. . did Continued page 71add sufficient proper accurate modi tion would closer 8 Gsfiers various statements such such airplane configuration .dramatically reduce body angle relative wind. t ships possible Id first admit its usually have small body angles land performance would akin stall little nose-up pitch elevator Stunt ship An air- statements flatly suggest plane would incapable Stunt pattern withit positive negative body an- Continued page 162 tilt $595 081 ozl taluezs t,eng Kepair Timer LaNtus 8 Gus axOEL c/I/todd Elt7LcL 9mm IREaKEr -tell eROOKLYN DOOcER 59 cabin WEST Retail $52 95*aINTRoDucToRY PRICE $3909 t930 Recerd Breaker 96 $6956 t939Zipper59$5356 t939 Kioud King 63 $4236 1991 Brigidier 56 $4976 t991 Super Ouaker 79 $7776 1940 So Long 5tS3936 t936 Buccaneer 09 $5996 1938 clipper MKI 72$ill56 1937 Dallaire tOt $7516 t93t Miss America 89 $7196 t991 Playboy Sr 50 $5116 1991 Playboy Jr 59 $3119 1938 Powerhouse 89 $5356 1990 Sailplane 78 $9976 1938 Trenton Terror 72 $9076 1990 Ranger 96$3t 96 1939 Korda Wake 99 $t916 1939 Mercury 72 6 kits qualify SAM events 1FF & RId feature highest quality machine cut & sanded parts Superior competition alt sheet atrip wood wire & window material Plans orig PP models easily convertible 3ch RIC KITS Sailpianes Electric power cas Hobby Horn SENSOAR Clider 78 9sl $1800 Midway Model GNOME RIC Hand Launch Glider$2900 Jolly Models FLINcER RIC HLG 50 Span $2990 Midway Model FAST EDDIE Aerobatic /09 Elec$t990 Jolly Models ELECTRIcUS Electric Clider 95s$3259 Leisure PLAYBOY SR 67 cear 95 Elect $3900 Astro ASTRO SPORT 37 Direct 99 Elect $2290 Leisure WASP 37 far Direct 95 Electrics $2250 Midway ULTRA MK iv 86 far Geared 09 EP $3999 Midway FLYING QUAKER 89 90-959 strake $6976 9ks/Midway DENNY JR 72 Alum camel $9396 9ks/Midwav BUZZARD BOMBSHELL 72$5196 FULL LINE OF ELECTRIC SYSTEMS 9 Parts Avail OTS TS RIOR TS T THE MOST SUPERIOR PILOT FIGURE ON THE MARKET LIGHTEST WEIGHT MOST REALISTIC AVAILABLE GIVE YOUR PLANE PILOT FOR YOUR NEWEST OLDEST OR NEXT CREATION R YOURS TODAY FULL FIGURES CIVILIANWWII MILITARY 1/3 Scale$19951/5 Navy$1395 1/4Scale14951/6AAF1195 1/5 Scale1295Plus 1/12 Scale895$250shipping 1/12Chopper 895each figure KNIGHTS OF THE AIR 7148 Lasting Light Way Columbia MD 21045 301-730-5596 SAVE UP TO 50% famous-make tools hard-to-find items FREE GIFTS valued 514 95 order OVER 1000 ITEMS fully guaranteed MICROMARK Box 5112-6324 E Main St Clinton NJ 08809 DYES Please rush big new catalogI youve ordered us before no need II Well send new cata og automaticallyI NAMEj ADDRESSI CITY __________________ STATE ______ ZIP _________ NewI MK II H & K Superstarters Q-35$2495 Q-50$2495 MAG II$3495 Super Hustler$3495 Zenoah$2495 Tartan Twin$3995 Roper 37$2495 90 Day Warranty need positive pitch minimal full-flap Stunt ship case some appropriate short having studied Teds rebuttle answered am persuaded changing word article either necessary appropriate Finally Ted correctly said am convinced conventional Stunt ships have less tension flying outside ma neuvers flying inside ones didnt arrive conviction assuming break dancing body positions ing mythical Outside Triangles simple observation anyone can make airplane directly downwind climbing vertically below 450 center traditional Square Eight would pull harder applied up-control 45 applied down-control simple test will divide Stunt fliers Preces sers P-ers Ted have both pointed out now conventionally-configured airplanes stab brings up rear require download tail stability Full-size airplanes carefully designed safe stable minimum payload-destroying download Since jet fuel costs went out sight dont just load 727s within approved CG range longernow try load within economy range GO roughly rear half approved range Id guess full-size conventional aircraft probably carry 3%ZENOAN QUARTZ CUSTOM Dual outlet aluminum muffler Carb rotated needle accessibility cowled Modified Quadra mount 6 bolt prop washer carb linkage 4 Complete assembled shoWn $14495 1516495 wIsuperearterI 5% less payload say flying wing same gross weight wing area Efficiency-wise Stunt ships another class entirely First build superstable airplanes grooooove placing CG balance point much farther ward necessary normal stable flight use large full-span flaps obtain high lift sharp corners coupled flaps create both high lift strong negative pitching moments Without quite knowing build airplanes super-effective stabs powerful elevators practical way lever Stunt ships out grooves sharp turns overcome terrific negative pitching moment full-span flaps arbitrary numbers Ted played around probably overstated case However doubt pay large penalty lost payload capability corresponds reduction G pulling capacity Stunt ships Id guess loss 20%-25% range airplanes high wing loadings big stiff flapsand somewhat less lightly-loaded classics smaller flaps less flap travel suffer real loss potential performance less equally no competitive disadvantage until some sharpie comes along canard stab front well-enough designed pret ty enough overcome judges natural bias against non-conforming airplanes guy just might blow doors off see unlike conventional airplanes stab stable canard actually carries part weight level high-G maneuvering flight canard doesnt suffer penalty downloaded stab gains bonus performance uploaded stab As result canard can carry weight have smaller wing turn tighter Look around guys still flying Fifties technology new age canard flying wing efficiency Interesting efficient new flying machines abound latest bomber Stealth reported flying wing Lockheed has proposed super-efficient canard airliner Nine ties business aviation Beech Star ship Avtec 400 Omacs Laser 300 flying now canards military 162 Model Aviation PK PRODUCTS Specializing Quadra/Zenoah Sales Service PO Box 6226 Hayward CA 94540Tel 415 581 -4277 Eves DEALER INQUIRES INVITED ALL ORDERS ADD $200 POSTAGE & HANDLING CALIF RES ADD SALES TAX viation Northrup X-29A anard has swept-forward wings iell general aviation Burt Rutans opular homebuilt Vari-Eze round-the-world Voyager both Ca ards signs canards will ome Stunt Ls inevitable radical new configurations nay can already see some problems 4th practical developmentand naybe solution First lets look flying wings Pre ision Aerobatics Flapless Combat-ship ke airplanes can never slow accurate recision maneuvers elevators n flying wing deflected upward nitial effect same raising flaps n conventional Stunt ship negative downward liftand lots Next levators change pitch attitude 4ng overall increased lift itched-up wing offsets down force ie elevators sink stops though pitch 411 continue change long levators deflected desired itch attitude reached elevators re neutralized will sort pward bounce airplane elimi ation downward lift short cor ers flown flapless flying wing can ever approximate smooth radius 411 always have funny little sinks bounces Another unusual characteristic lapless flying wing demonstrated early designs semiscale 63B would take off up levator up-elevator applied ground couldnt rotate nose Lpward negative lift created sure 1ued sucker ground fly first pop loose down levator get clear ground hen follow up-elevator subsequent nore-or-less normal flight Trailing edge flaps obviously wont work mn flying wing either think Precision Stunt flying wing would possible sets flush-mounted flaps upper lower wing surfaces located near spar bottom flap would operate up-elevator provide enough lift balance sinking tendency pitch attitude changed vice versa desired pitch attitude obtained flap would retract elevators centered- Positive negative lift would disappear simultaneously bouncing wing spar-mounted flaps wouldnt efficient lift-producers trailing edge flaps should nevertheless work Actually canards will easier design fly CG will still conventionally located just ahead spar Wing design lead-out position will remain unchanged stab will moved front can probably reduced size keep normal near-spar balance point engine will probably have moved rear installed pusher configuration has aerodynamic advantages rear engine push/pull twins like Cessna Skymaster usually has greater thrust improved airflow out prop Aerodynamics will also improved removing propwash SAILPLANES WORLD iSOlA Coffee Rd Modesto CA 95355 airframe biggest problem pusher canards will probably en gine heat have troubles enough cooling Stunt engines directly prop-blasted flow Without blast cooling air supplementary cooling prob ably liquid cooling will required will tough can doneand rewards canard performance improve ment could rich will canard fly Wellllll retract-equipped twin-engined Hornet has ink lines molded-balsa P-47N fuselage finished molded-balsa P-5 lB fuselage Also have some molds finished all-glass Ultimate Spitfire guess what Im trying say personally will have trouble replacing WW II fighters strange new shapes however well may fly innovation creativity experimen tation ridiculous amount effort finally managed make semiscale Stunters fully competitive best todays conventional Stunt ships As survey situation dont believe enough unrealized performance potential left semiscale Stunters compete fully against improved aerodynamics Sailplanes International Krause MultiPlex Wan itschek Wik & Roke Sport-Scale-F3B European Hardware Accessories Send $500 Cat & Price List 209 577-0506 June 1985 163 iddreSS PAY BY CHECK OR MONEY ORDER money orders shipped same day received Send Jeffla Products PO Box 484 Lake Elsinore CA 92330 call 714 674-1151 radically new ships What heck day comes Ill just fly Sea Fury Old-Timer Stunt Al Rabe 1904 Valley Oaks Ct Irving TX 75061 CL Racing/Ballard Continued page 72 must filled tube removed fuel bulb discarded engine restarted Apparently two-andone-half seconds can saved using pressure refueler system am enclosing picture typical problem encoun tered hitting quick-fill fill pipe particular pit man using fingers left hand guide filler pipe quick-fill left hand could attaching battery resetting fuel shutoff competitor has apparently mastered situation Tim Gillott Tim utilizes pressurized fuel system similar Matched Performance system TOP PERFORMANCE K&B ENGINES 16 Airplane 4 Marne K&B FUELSK&B GLOW PLUGS 7 BlenUs4 choices Matched Finish System BEST APPEARANCE K&B FIBERGLASS CLOTH K&B Micro-Balloons FILLER K&B SUPER FOXY RESIN K&B SUPER FOXY THINNER K&R SUPER FOXY PRIMERK&B SUPER FOXY PAINT 66 MIXING CUPS used Team Race competitors uses army ammo belt pint fuel can pressurized either Coleman pump air pump such used RC retractable gear systems tube exits can rubberbanded arm female type TR fitting tank other half mounted Tims middle finger leaves thumb index finger free battery connections So essence tank can filled other two fingers can clamping engage battery leaves right hand completely free reset shutoff flip propeller no bulb needs discarded no problem entering exiting quick-fill tube no way dirt can enter system bulb rolling around ground getting dirt fuel jug area Sport Race tank modifications have several requests concerning reliable tank use Sport Race models big problems find Racers plain-bearing engines tend vibrate causing fuel-foam ing problems very sturdy front nose pod profile fuselage must utilized keep vibration minimum addition found beneficial use clear silicone caulk blue gasket sealer between profile fuselage tank dampen vibration silicone seemed unaffected high- low nitro fuels tank seems useful rectangular tank approxi mately four inches long oneand-one-half inches wide tank must mounted fuel feed tube parallel center needle valve tube needs removed tank bent fuel line tub ing can passed through fuel shutoff kinking also away heat engine Midwest Sport Race rules require A-in fill tube found fill tube worked much bet ter bent air flow tube merely enters inside tank does run back feed line might Uniflow system tube merely sticks down inside front tank bent air stream have found excellent bends can made copper brass tubing us ing Harry Higleys tube-bender vir tually eliminates kinks almost angle bend can easily accomplished transition full empty rectangular tank seems excellent Obviously larger capacity tank engine can set fairly lean fear overheating since fuel shutoff can utilized larger-capacity tank fuel pressure 30 40 laps before pit stop will allow constant needle valve setting Finally find putting tank underneath wing additional silicone damping can used vibra tion-free tank attachment possible putting silicone 6n top section tank building plywood floor particular underside wing area help dampen vibration New products have just seen three new propeller pitch gauges produced Walt Perkins Shadow Racing F IDLflULIL~ three styles Team Race Style Style II The Team Race pitch gauge measures EEUEBIE -in pitch increments designed props 8-in diameter pitches 4 8 Style props 12-in 70 cowls 9 wheelpants tar Sig Pica diameter pitches 3 15 Top-Flue Jemco Nosen Pilot Stattord Radlals BehrensGarmhausen W E Tech andutherkilsand half-pitch increments Style II plans One-piece laminated construction handlaid 24-in diameter propellers 4 14-in liberglass strong lightweight Send BASE tor pitch A-in pitch increments price list please include names models interested parts tar call between DAM -gauges lighter weight 9 PM EDT tor intormatlon COD ordering Wecompact facilitate transportation hope hear youlfield use have permanently photo IBERGLASS 703 890-6017etched scales will rub off gauges can ordered meas jU4ERure pusher props well tractor Opt MA RI Ba 530 Goodvew VA 24095 Continued page 16t 164 Model Aviation FULL LINE METAL SPECIALISTS
Edition: Model Aviation - 1985/06
Page Numbers: 71, 160, 162, 163, 164
Control Line Aerobatics Ted Fancher think youre seeing double month youre almost right two Con trol Line Aerobatics columns time Its because Ted Fancher regular contributing editor subject has expounding things dear heart Al Rabe special con tributor month Both modelers acknowledged experts subject both cling certain beliefs about aerodynamic facts IWe spe cialized type model agreement Whos right MA editorial staff doesnt know have agreed publish Al Rabes thoughts follow interested modeler can read judge himseW/herself Also Al has something say about tail-first designs may set thinking THIS COLUMN being written because Ted Fancher has talking about P factor gyroscopic precession want lay topics rest Im addressing issue time because Ted misquoted columns Now feel important insofar readers Teds column actually incorporate some ideas design and/or construction airplanes hope having nicer-flying craft greater competitive success example few Stunt fliers have tried such things shock-absorbing landing gears significant dihedral movable rudders airplanes have installed bellcranks upside down nearly everyone uses sliding-block/slot ted-wing-tip adjustable lead-out guides idea originated 1968 first published Bearcat construction article 1970 decide features going incorporate new Stunt ship have right evaluate best available information accurately present ed isnt important whether agree Ted differences over P-factor precession long interested receive fair presentation tried present ideas article CL Stunt Design January 1985 issue Model Aviation tried present clearly accurately think Stunt fliers understood ideas until Ted paraphrased substi tuted expression turn obvi ously meant lift certainly no intention suggesting .an air plane would turn ever changing its geometric angle attack Neither did suggest .. lift causes aircraft body angle change Quite contrary RELATIVE 9 WIND F&OATTACK RELATIVE WIND ALTHOUGH WING APPROACHES STALL ASCENDING BLADE. AND DESCENDING BLADE NEAR ThE SAME ANGLE TO THE RELATIVE WIND AND THEREFORE NEAR EQUAL THRUST WITh UTTLE iW Al Rabe discussed two sketches article January 1985 Issue Above Ted Fancher picked up discussion used other drawing Below April 1985 issue After Al Rabe took exception Fanchers remarks so. read AOJA THIS FORCE MUST BE OVERCOME BY THE TAIL BEFORE THE A/C CAN PITCH NOSE UP 4 OG -4 PITCHING MOMENT 5OLBSXI-I/2zz75iNCH/LBS NOSE DOWN simply said necessary change body angle create lift Perhaps will understandable elaborate what think Teds elaboration drawing January article Lets see now Teds drawing April 1985 issue page 67 suggests agrees possible generate 50 pounds lift changing effective angle attack means deflecting flaps necessarily changing body anglebut creating strong nose-down pitching moment near cen ter gravity CG Actually exactly point saw no need compli cate matters farther discussion pitching moments Further atno point did relate lift turn except point out maximum maneuvering ie turning angle attack would reached about same body angle relative wind slow-speed landing body angle illustrate lets add some hypo thetical numbers dimensions Teds April drawing Lets think 50 lb lift apparent 16 Gs 5O-oz Stunt ship sake sweet reason Ill stipulate center lift indeed 1 behind CG does creat 75 in-lb nose-down pitching moment Now lets add horizontal tall surfaces having center lift point say 25 aft aircraft CG controlled flap deflection caused 50 lb lift matched up-elevator deflec tion caused 3-lb download tail 3 lb times 25 results 75 in-lb nose-up moment balancing exactly flaps 75 in-lb nose-down moment result airplane climbs absolutely flat no body angle should point out 3-lb download real weight must carried wings Thus actual effective weight carried wing instant would 98 oz achieved vertical accelera Continued page 160 June 1985 71 50 LBS LIFT ASCENDING BLADE HALLOW ANGLE TO WIND PRODUCING LESS THRUST DESCENDING BLADE TEEP ANGLE TO RELATIVE WIND PRODUCING MORE THRUST AND STRONG LEFT YAW Model Magic Epoxy Plus 2 Part 8 Mm Use anywhere two part epoxy used 25% Lighter Sandable Carveable Excellent Gap Filling Non-Sagging Superior Strength $fl95 Sands Carves like Basswood l 16 81 oz Equal over 8 wt oz regular epoxys See dealer first write call PO Box 19784 St Paul MN 55119 715 425-1397 MODEL MAGIC PRODUCTS 0 Model Magic Filler 0 0 S S Comparison Chart Model Magic Product X Adhesion BalsaEacellent Foam Fiberglasa Strength Flesing Spreading FuelResistance SandingAs med balsa HardnessAs hard balsa FinishingAny finish/covering Shelf Lifetill used up TintAcceptanceExcellent water ResistExcellent 0 very Poor Soft balsa Soft balsa 5-7 inn very Poor Test methods data available request care enough fill very best insist Model Magic Filler Circtie Manic Filler r Super sport flier turnaround pattern esisa Construction 70 span 927 sq area $1 j 759859 lbs 75-12cu Dealer Inquiry Invited 3405 Cleveland Ave SW Canton OH 44707 Send $1 Catalog 1216 4846810 mm~~ROUSH MFG 31-lllllrlb S HANDLING Up $999 add $199 $891 $2909 add $229 $2901 $9590 add $300 $9591 $7099 add $309 over $7909 add $9 001 CA Addressees add 69 tax Send MO visa/McI#Exp Check lallow up 30 days CK clearancel COD Exact Charges plus $159 Hdl ICash Only 84 Page CATALE*uu*S $209 PP/tnt Class espy will oent free--when requested-with order HOBBY HORN 15173 Moran St [A] PO Box 2212 Westminster Ca 92699 1719 8938311 [Aft Nm 719 8951203] 160 Model Aviation Still own opinion flaps have strong effect tracking Particu larly influential spanwise distribu tion As flaps get shorter tracking suf fers Flaps should long span nar row chord Rule Thumb Fancher Flaps should full-span nearly chord should range 15% 20% wing chord depending air craft weight addition hingeline should straight Since Stunter flies constant left skid straight hingeline assures airflow across airfoil consistent possible entire span final design objective Uniformity Turn pitch prime design factor Decalage Decalage fancy term alignment wing tail blunt should no decalage Stunter centerlines wing tail matter thrust line must parallel Any misalignment of either design construc tion will result plane turns dif ferently inside versus outside Dont Secondarily aware locate large draggy parts airplane Uneven vertical distribution drag relative CG will result unequal turns No rules thumb must eyeball side view make educated guess drag distribution same goes drags opposite number thrust Dont mount engine pylon above tail expect ship turn well inside about winds up design phase Next month well preflight get started flying Ted Fancher 158 Flying Cloud Isle Foster City CA 94404 gles Does mean surrender quite As Ted correctly pointed out ineffective tail surfaces elevator pushrod discon nected will cause violent nose-down response up-elevator down-flap control reversed control vengeance extreme deflected flaps create 75 in-lb nose-down mo ment tail surfaces produce 28 lb download 70 in-lb nose-up moment due elevators too small size too little deflection result will still reversed controls violently same flap deflection stronger tail surfaces produced 32-lb download 80 in-lb nose-up moment result would positive nose-up rotation response up-control application Lets put together have Stunt ship wing-bending load 50 lb 3-az change tail download causes turn Its opinion real work situation high ljfl required oppose high 0-loads tight corner Relatively little effort ex pended change body angle relatively little change body angle required airplane turn sharply Once again maneuvering body angle maximum loads should approximate body angle slow-speed stall case full-flap Stunt ship observe body angle such case slight thus insignificant pitchinsignificant P-factor statement does did read No pitchno P simply signs real effects P recognized addressed less importance effect precession applica tion full-flap Stunt ships summarize did suggest _______________________________.. aircr. can make abrupt pitch change. achieving posi CL Aerobatics/Rabetive geometrical angle attack. . did Continued page 71add sufficient proper accurate modi tion would closer 8 Gsfiers various statements such such airplane configuration .dramatically reduce body angle relative wind. t ships possible Id first admit its usually have small body angles land performance would akin stall little nose-up pitch elevator Stunt ship An air- statements flatly suggest plane would incapable Stunt pattern withit positive negative body an- Continued page 162 tilt $595 081 ozl taluezs t,eng Kepair Timer LaNtus 8 Gus axOEL c/I/todd Elt7LcL 9mm IREaKEr -tell eROOKLYN DOOcER 59 cabin WEST Retail $52 95*aINTRoDucToRY PRICE $3909 t930 Recerd Breaker 96 $6956 t939Zipper59$5356 t939 Kioud King 63 $4236 1991 Brigidier 56 $4976 t991 Super Ouaker 79 $7776 1940 So Long 5tS3936 t936 Buccaneer 09 $5996 1938 clipper MKI 72$ill56 1937 Dallaire tOt $7516 t93t Miss America 89 $7196 t991 Playboy Sr 50 $5116 1991 Playboy Jr 59 $3119 1938 Powerhouse 89 $5356 1990 Sailplane 78 $9976 1938 Trenton Terror 72 $9076 1990 Ranger 96$3t 96 1939 Korda Wake 99 $t916 1939 Mercury 72 6 kits qualify SAM events 1FF & RId feature highest quality machine cut & sanded parts Superior competition alt sheet atrip wood wire & window material Plans orig PP models easily convertible 3ch RIC KITS Sailpianes Electric power cas Hobby Horn SENSOAR Clider 78 9sl $1800 Midway Model GNOME RIC Hand Launch Glider$2900 Jolly Models FLINcER RIC HLG 50 Span $2990 Midway Model FAST EDDIE Aerobatic /09 Elec$t990 Jolly Models ELECTRIcUS Electric Clider 95s$3259 Leisure PLAYBOY SR 67 cear 95 Elect $3900 Astro ASTRO SPORT 37 Direct 99 Elect $2290 Leisure WASP 37 far Direct 95 Electrics $2250 Midway ULTRA MK iv 86 far Geared 09 EP $3999 Midway FLYING QUAKER 89 90-959 strake $6976 9ks/Midway DENNY JR 72 Alum camel $9396 9ks/Midwav BUZZARD BOMBSHELL 72$5196 FULL LINE OF ELECTRIC SYSTEMS 9 Parts Avail OTS TS RIOR TS T THE MOST SUPERIOR PILOT FIGURE ON THE MARKET LIGHTEST WEIGHT MOST REALISTIC AVAILABLE GIVE YOUR PLANE PILOT FOR YOUR NEWEST OLDEST OR NEXT CREATION R YOURS TODAY FULL FIGURES CIVILIANWWII MILITARY 1/3 Scale$19951/5 Navy$1395 1/4Scale14951/6AAF1195 1/5 Scale1295Plus 1/12 Scale895$250shipping 1/12Chopper 895each figure KNIGHTS OF THE AIR 7148 Lasting Light Way Columbia MD 21045 301-730-5596 SAVE UP TO 50% famous-make tools hard-to-find items FREE GIFTS valued 514 95 order OVER 1000 ITEMS fully guaranteed MICROMARK Box 5112-6324 E Main St Clinton NJ 08809 DYES Please rush big new catalogI youve ordered us before no need II Well send new cata og automaticallyI NAMEj ADDRESSI CITY __________________ STATE ______ ZIP _________ NewI MK II H & K Superstarters Q-35$2495 Q-50$2495 MAG II$3495 Super Hustler$3495 Zenoah$2495 Tartan Twin$3995 Roper 37$2495 90 Day Warranty need positive pitch minimal full-flap Stunt ship case some appropriate short having studied Teds rebuttle answered am persuaded changing word article either necessary appropriate Finally Ted correctly said am convinced conventional Stunt ships have less tension flying outside ma neuvers flying inside ones didnt arrive conviction assuming break dancing body positions ing mythical Outside Triangles simple observation anyone can make airplane directly downwind climbing vertically below 450 center traditional Square Eight would pull harder applied up-control 45 applied down-control simple test will divide Stunt fliers Preces sers P-ers Ted have both pointed out now conventionally-configured airplanes stab brings up rear require download tail stability Full-size airplanes carefully designed safe stable minimum payload-destroying download Since jet fuel costs went out sight dont just load 727s within approved CG range longernow try load within economy range GO roughly rear half approved range Id guess full-size conventional aircraft probably carry 3%ZENOAN QUARTZ CUSTOM Dual outlet aluminum muffler Carb rotated needle accessibility cowled Modified Quadra mount 6 bolt prop washer carb linkage 4 Complete assembled shoWn $14495 1516495 wIsuperearterI 5% less payload say flying wing same gross weight wing area Efficiency-wise Stunt ships another class entirely First build superstable airplanes grooooove placing CG balance point much farther ward necessary normal stable flight use large full-span flaps obtain high lift sharp corners coupled flaps create both high lift strong negative pitching moments Without quite knowing build airplanes super-effective stabs powerful elevators practical way lever Stunt ships out grooves sharp turns overcome terrific negative pitching moment full-span flaps arbitrary numbers Ted played around probably overstated case However doubt pay large penalty lost payload capability corresponds reduction G pulling capacity Stunt ships Id guess loss 20%-25% range airplanes high wing loadings big stiff flapsand somewhat less lightly-loaded classics smaller flaps less flap travel suffer real loss potential performance less equally no competitive disadvantage until some sharpie comes along canard stab front well-enough designed pret ty enough overcome judges natural bias against non-conforming airplanes guy just might blow doors off see unlike conventional airplanes stab stable canard actually carries part weight level high-G maneuvering flight canard doesnt suffer penalty downloaded stab gains bonus performance uploaded stab As result canard can carry weight have smaller wing turn tighter Look around guys still flying Fifties technology new age canard flying wing efficiency Interesting efficient new flying machines abound latest bomber Stealth reported flying wing Lockheed has proposed super-efficient canard airliner Nine ties business aviation Beech Star ship Avtec 400 Omacs Laser 300 flying now canards military 162 Model Aviation PK PRODUCTS Specializing Quadra/Zenoah Sales Service PO Box 6226 Hayward CA 94540Tel 415 581 -4277 Eves DEALER INQUIRES INVITED ALL ORDERS ADD $200 POSTAGE & HANDLING CALIF RES ADD SALES TAX viation Northrup X-29A anard has swept-forward wings iell general aviation Burt Rutans opular homebuilt Vari-Eze round-the-world Voyager both Ca ards signs canards will ome Stunt Ls inevitable radical new configurations nay can already see some problems 4th practical developmentand naybe solution First lets look flying wings Pre ision Aerobatics Flapless Combat-ship ke airplanes can never slow accurate recision maneuvers elevators n flying wing deflected upward nitial effect same raising flaps n conventional Stunt ship negative downward liftand lots Next levators change pitch attitude 4ng overall increased lift itched-up wing offsets down force ie elevators sink stops though pitch 411 continue change long levators deflected desired itch attitude reached elevators re neutralized will sort pward bounce airplane elimi ation downward lift short cor ers flown flapless flying wing can ever approximate smooth radius 411 always have funny little sinks bounces Another unusual characteristic lapless flying wing demonstrated early designs semiscale 63B would take off up levator up-elevator applied ground couldnt rotate nose Lpward negative lift created sure 1ued sucker ground fly first pop loose down levator get clear ground hen follow up-elevator subsequent nore-or-less normal flight Trailing edge flaps obviously wont work mn flying wing either think Precision Stunt flying wing would possible sets flush-mounted flaps upper lower wing surfaces located near spar bottom flap would operate up-elevator provide enough lift balance sinking tendency pitch attitude changed vice versa desired pitch attitude obtained flap would retract elevators centered- Positive negative lift would disappear simultaneously bouncing wing spar-mounted flaps wouldnt efficient lift-producers trailing edge flaps should nevertheless work Actually canards will easier design fly CG will still conventionally located just ahead spar Wing design lead-out position will remain unchanged stab will moved front can probably reduced size keep normal near-spar balance point engine will probably have moved rear installed pusher configuration has aerodynamic advantages rear engine push/pull twins like Cessna Skymaster usually has greater thrust improved airflow out prop Aerodynamics will also improved removing propwash SAILPLANES WORLD iSOlA Coffee Rd Modesto CA 95355 airframe biggest problem pusher canards will probably en gine heat have troubles enough cooling Stunt engines directly prop-blasted flow Without blast cooling air supplementary cooling prob ably liquid cooling will required will tough can doneand rewards canard performance improve ment could rich will canard fly Wellllll retract-equipped twin-engined Hornet has ink lines molded-balsa P-47N fuselage finished molded-balsa P-5 lB fuselage Also have some molds finished all-glass Ultimate Spitfire guess what Im trying say personally will have trouble replacing WW II fighters strange new shapes however well may fly innovation creativity experimen tation ridiculous amount effort finally managed make semiscale Stunters fully competitive best todays conventional Stunt ships As survey situation dont believe enough unrealized performance potential left semiscale Stunters compete fully against improved aerodynamics Sailplanes International Krause MultiPlex Wan itschek Wik & Roke Sport-Scale-F3B European Hardware Accessories Send $500 Cat & Price List 209 577-0506 June 1985 163 iddreSS PAY BY CHECK OR MONEY ORDER money orders shipped same day received Send Jeffla Products PO Box 484 Lake Elsinore CA 92330 call 714 674-1151 radically new ships What heck day comes Ill just fly Sea Fury Old-Timer Stunt Al Rabe 1904 Valley Oaks Ct Irving TX 75061 CL Racing/Ballard Continued page 72 must filled tube removed fuel bulb discarded engine restarted Apparently two-andone-half seconds can saved using pressure refueler system am enclosing picture typical problem encoun tered hitting quick-fill fill pipe particular pit man using fingers left hand guide filler pipe quick-fill left hand could attaching battery resetting fuel shutoff competitor has apparently mastered situation Tim Gillott Tim utilizes pressurized fuel system similar Matched Performance system TOP PERFORMANCE K&B ENGINES 16 Airplane 4 Marne K&B FUELSK&B GLOW PLUGS 7 BlenUs4 choices Matched Finish System BEST APPEARANCE K&B FIBERGLASS CLOTH K&B Micro-Balloons FILLER K&B SUPER FOXY RESIN K&B SUPER FOXY THINNER K&R SUPER FOXY PRIMERK&B SUPER FOXY PAINT 66 MIXING CUPS used Team Race competitors uses army ammo belt pint fuel can pressurized either Coleman pump air pump such used RC retractable gear systems tube exits can rubberbanded arm female type TR fitting tank other half mounted Tims middle finger leaves thumb index finger free battery connections So essence tank can filled other two fingers can clamping engage battery leaves right hand completely free reset shutoff flip propeller no bulb needs discarded no problem entering exiting quick-fill tube no way dirt can enter system bulb rolling around ground getting dirt fuel jug area Sport Race tank modifications have several requests concerning reliable tank use Sport Race models big problems find Racers plain-bearing engines tend vibrate causing fuel-foam ing problems very sturdy front nose pod profile fuselage must utilized keep vibration minimum addition found beneficial use clear silicone caulk blue gasket sealer between profile fuselage tank dampen vibration silicone seemed unaffected high- low nitro fuels tank seems useful rectangular tank approxi mately four inches long oneand-one-half inches wide tank must mounted fuel feed tube parallel center needle valve tube needs removed tank bent fuel line tub ing can passed through fuel shutoff kinking also away heat engine Midwest Sport Race rules require A-in fill tube found fill tube worked much bet ter bent air flow tube merely enters inside tank does run back feed line might Uniflow system tube merely sticks down inside front tank bent air stream have found excellent bends can made copper brass tubing us ing Harry Higleys tube-bender vir tually eliminates kinks almost angle bend can easily accomplished transition full empty rectangular tank seems excellent Obviously larger capacity tank engine can set fairly lean fear overheating since fuel shutoff can utilized larger-capacity tank fuel pressure 30 40 laps before pit stop will allow constant needle valve setting Finally find putting tank underneath wing additional silicone damping can used vibra tion-free tank attachment possible putting silicone 6n top section tank building plywood floor particular underside wing area help dampen vibration New products have just seen three new propeller pitch gauges produced Walt Perkins Shadow Racing F IDLflULIL~ three styles Team Race Style Style II The Team Race pitch gauge measures EEUEBIE -in pitch increments designed props 8-in diameter pitches 4 8 Style props 12-in 70 cowls 9 wheelpants tar Sig Pica diameter pitches 3 15 Top-Flue Jemco Nosen Pilot Stattord Radlals BehrensGarmhausen W E Tech andutherkilsand half-pitch increments Style II plans One-piece laminated construction handlaid 24-in diameter propellers 4 14-in liberglass strong lightweight Send BASE tor pitch A-in pitch increments price list please include names models interested parts tar call between DAM -gauges lighter weight 9 PM EDT tor intormatlon COD ordering Wecompact facilitate transportation hope hear youlfield use have permanently photo IBERGLASS 703 890-6017etched scales will rub off gauges can ordered meas jU4ERure pusher props well tractor Opt MA RI Ba 530 Goodvew VA 24095 Continued page 16t 164 Model Aviation FULL LINE METAL SPECIALISTS
Edition: Model Aviation - 1985/06
Page Numbers: 71, 160, 162, 163, 164
Control Line Aerobatics Ted Fancher think youre seeing double month youre almost right two Con trol Line Aerobatics columns time Its because Ted Fancher regular contributing editor subject has expounding things dear heart Al Rabe special con tributor month Both modelers acknowledged experts subject both cling certain beliefs about aerodynamic facts IWe spe cialized type model agreement Whos right MA editorial staff doesnt know have agreed publish Al Rabes thoughts follow interested modeler can read judge himseW/herself Also Al has something say about tail-first designs may set thinking THIS COLUMN being written because Ted Fancher has talking about P factor gyroscopic precession want lay topics rest Im addressing issue time because Ted misquoted columns Now feel important insofar readers Teds column actually incorporate some ideas design and/or construction airplanes hope having nicer-flying craft greater competitive success example few Stunt fliers have tried such things shock-absorbing landing gears significant dihedral movable rudders airplanes have installed bellcranks upside down nearly everyone uses sliding-block/slot ted-wing-tip adjustable lead-out guides idea originated 1968 first published Bearcat construction article 1970 decide features going incorporate new Stunt ship have right evaluate best available information accurately present ed isnt important whether agree Ted differences over P-factor precession long interested receive fair presentation tried present ideas article CL Stunt Design January 1985 issue Model Aviation tried present clearly accurately think Stunt fliers understood ideas until Ted paraphrased substi tuted expression turn obvi ously meant lift certainly no intention suggesting .an air plane would turn ever changing its geometric angle attack Neither did suggest .. lift causes aircraft body angle change Quite contrary RELATIVE 9 WIND F&OATTACK RELATIVE WIND ALTHOUGH WING APPROACHES STALL ASCENDING BLADE. AND DESCENDING BLADE NEAR ThE SAME ANGLE TO THE RELATIVE WIND AND THEREFORE NEAR EQUAL THRUST WITh UTTLE iW Al Rabe discussed two sketches article January 1985 Issue Above Ted Fancher picked up discussion used other drawing Below April 1985 issue After Al Rabe took exception Fanchers remarks so. read AOJA THIS FORCE MUST BE OVERCOME BY THE TAIL BEFORE THE A/C CAN PITCH NOSE UP 4 OG -4 PITCHING MOMENT 5OLBSXI-I/2zz75iNCH/LBS NOSE DOWN simply said necessary change body angle create lift Perhaps will understandable elaborate what think Teds elaboration drawing January article Lets see now Teds drawing April 1985 issue page 67 suggests agrees possible generate 50 pounds lift changing effective angle attack means deflecting flaps necessarily changing body anglebut creating strong nose-down pitching moment near cen ter gravity CG Actually exactly point saw no need compli cate matters farther discussion pitching moments Further atno point did relate lift turn except point out maximum maneuvering ie turning angle attack would reached about same body angle relative wind slow-speed landing body angle illustrate lets add some hypo thetical numbers dimensions Teds April drawing Lets think 50 lb lift apparent 16 Gs 5O-oz Stunt ship sake sweet reason Ill stipulate center lift indeed 1 behind CG does creat 75 in-lb nose-down pitching moment Now lets add horizontal tall surfaces having center lift point say 25 aft aircraft CG controlled flap deflection caused 50 lb lift matched up-elevator deflec tion caused 3-lb download tail 3 lb times 25 results 75 in-lb nose-up moment balancing exactly flaps 75 in-lb nose-down moment result airplane climbs absolutely flat no body angle should point out 3-lb download real weight must carried wings Thus actual effective weight carried wing instant would 98 oz achieved vertical accelera Continued page 160 June 1985 71 50 LBS LIFT ASCENDING BLADE HALLOW ANGLE TO WIND PRODUCING LESS THRUST DESCENDING BLADE TEEP ANGLE TO RELATIVE WIND PRODUCING MORE THRUST AND STRONG LEFT YAW Model Magic Epoxy Plus 2 Part 8 Mm Use anywhere two part epoxy used 25% Lighter Sandable Carveable Excellent Gap Filling Non-Sagging Superior Strength $fl95 Sands Carves like Basswood l 16 81 oz Equal over 8 wt oz regular epoxys See dealer first write call PO Box 19784 St Paul MN 55119 715 425-1397 MODEL MAGIC PRODUCTS 0 Model Magic Filler 0 0 S S Comparison Chart Model Magic Product X Adhesion BalsaEacellent Foam Fiberglasa Strength Flesing Spreading FuelResistance SandingAs med balsa HardnessAs hard balsa FinishingAny finish/covering Shelf Lifetill used up TintAcceptanceExcellent water ResistExcellent 0 very Poor Soft balsa Soft balsa 5-7 inn very Poor Test methods data available request care enough fill very best insist Model Magic Filler Circtie Manic Filler r Super sport flier turnaround pattern esisa Construction 70 span 927 sq area $1 j 759859 lbs 75-12cu Dealer Inquiry Invited 3405 Cleveland Ave SW Canton OH 44707 Send $1 Catalog 1216 4846810 mm~~ROUSH MFG 31-lllllrlb S HANDLING Up $999 add $199 $891 $2909 add $229 $2901 $9590 add $300 $9591 $7099 add $309 over $7909 add $9 001 CA Addressees add 69 tax Send MO visa/McI#Exp Check lallow up 30 days CK clearancel COD Exact Charges plus $159 Hdl ICash Only 84 Page CATALE*uu*S $209 PP/tnt Class espy will oent free--when requested-with order HOBBY HORN 15173 Moran St [A] PO Box 2212 Westminster Ca 92699 1719 8938311 [Aft Nm 719 8951203] 160 Model Aviation Still own opinion flaps have strong effect tracking Particu larly influential spanwise distribu tion As flaps get shorter tracking suf fers Flaps should long span nar row chord Rule Thumb Fancher Flaps should full-span nearly chord should range 15% 20% wing chord depending air craft weight addition hingeline should straight Since Stunter flies constant left skid straight hingeline assures airflow across airfoil consistent possible entire span final design objective Uniformity Turn pitch prime design factor Decalage Decalage fancy term alignment wing tail blunt should no decalage Stunter centerlines wing tail matter thrust line must parallel Any misalignment of either design construc tion will result plane turns dif ferently inside versus outside Dont Secondarily aware locate large draggy parts airplane Uneven vertical distribution drag relative CG will result unequal turns No rules thumb must eyeball side view make educated guess drag distribution same goes drags opposite number thrust Dont mount engine pylon above tail expect ship turn well inside about winds up design phase Next month well preflight get started flying Ted Fancher 158 Flying Cloud Isle Foster City CA 94404 gles Does mean surrender quite As Ted correctly pointed out ineffective tail surfaces elevator pushrod discon nected will cause violent nose-down response up-elevator down-flap control reversed control vengeance extreme deflected flaps create 75 in-lb nose-down mo ment tail surfaces produce 28 lb download 70 in-lb nose-up moment due elevators too small size too little deflection result will still reversed controls violently same flap deflection stronger tail surfaces produced 32-lb download 80 in-lb nose-up moment result would positive nose-up rotation response up-control application Lets put together have Stunt ship wing-bending load 50 lb 3-az change tail download causes turn Its opinion real work situation high ljfl required oppose high 0-loads tight corner Relatively little effort ex pended change body angle relatively little change body angle required airplane turn sharply Once again maneuvering body angle maximum loads should approximate body angle slow-speed stall case full-flap Stunt ship observe body angle such case slight thus insignificant pitchinsignificant P-factor statement does did read No pitchno P simply signs real effects P recognized addressed less importance effect precession applica tion full-flap Stunt ships summarize did suggest _______________________________.. aircr. can make abrupt pitch change. achieving posi CL Aerobatics/Rabetive geometrical angle attack. . did Continued page 71add sufficient proper accurate modi tion would closer 8 Gsfiers various statements such such airplane configuration .dramatically reduce body angle relative wind. t ships possible Id first admit its usually have small body angles land performance would akin stall little nose-up pitch elevator Stunt ship An air- statements flatly suggest plane would incapable Stunt pattern withit positive negative body an- Continued page 162 tilt $595 081 ozl taluezs t,eng Kepair Timer LaNtus 8 Gus axOEL c/I/todd Elt7LcL 9mm IREaKEr -tell eROOKLYN DOOcER 59 cabin WEST Retail $52 95*aINTRoDucToRY PRICE $3909 t930 Recerd Breaker 96 $6956 t939Zipper59$5356 t939 Kioud King 63 $4236 1991 Brigidier 56 $4976 t991 Super Ouaker 79 $7776 1940 So Long 5tS3936 t936 Buccaneer 09 $5996 1938 clipper MKI 72$ill56 1937 Dallaire tOt $7516 t93t Miss America 89 $7196 t991 Playboy Sr 50 $5116 1991 Playboy Jr 59 $3119 1938 Powerhouse 89 $5356 1990 Sailplane 78 $9976 1938 Trenton Terror 72 $9076 1990 Ranger 96$3t 96 1939 Korda Wake 99 $t916 1939 Mercury 72 6 kits qualify SAM events 1FF & RId feature highest quality machine cut & sanded parts Superior competition alt sheet atrip wood wire & window material Plans orig PP models easily convertible 3ch RIC KITS Sailpianes Electric power cas Hobby Horn SENSOAR Clider 78 9sl $1800 Midway Model GNOME RIC Hand Launch Glider$2900 Jolly Models FLINcER RIC HLG 50 Span $2990 Midway Model FAST EDDIE Aerobatic /09 Elec$t990 Jolly Models ELECTRIcUS Electric Clider 95s$3259 Leisure PLAYBOY SR 67 cear 95 Elect $3900 Astro ASTRO SPORT 37 Direct 99 Elect $2290 Leisure WASP 37 far Direct 95 Electrics $2250 Midway ULTRA MK iv 86 far Geared 09 EP $3999 Midway FLYING QUAKER 89 90-959 strake $6976 9ks/Midway DENNY JR 72 Alum camel $9396 9ks/Midwav BUZZARD BOMBSHELL 72$5196 FULL LINE OF ELECTRIC SYSTEMS 9 Parts Avail OTS TS RIOR TS T THE MOST SUPERIOR PILOT FIGURE ON THE MARKET LIGHTEST WEIGHT MOST REALISTIC AVAILABLE GIVE YOUR PLANE PILOT FOR YOUR NEWEST OLDEST OR NEXT CREATION R YOURS TODAY FULL FIGURES CIVILIANWWII MILITARY 1/3 Scale$19951/5 Navy$1395 1/4Scale14951/6AAF1195 1/5 Scale1295Plus 1/12 Scale895$250shipping 1/12Chopper 895each figure KNIGHTS OF THE AIR 7148 Lasting Light Way Columbia MD 21045 301-730-5596 SAVE UP TO 50% famous-make tools hard-to-find items FREE GIFTS valued 514 95 order OVER 1000 ITEMS fully guaranteed MICROMARK Box 5112-6324 E Main St Clinton NJ 08809 DYES Please rush big new catalogI youve ordered us before no need II Well send new cata og automaticallyI NAMEj ADDRESSI CITY __________________ STATE ______ ZIP _________ NewI MK II H & K Superstarters Q-35$2495 Q-50$2495 MAG II$3495 Super Hustler$3495 Zenoah$2495 Tartan Twin$3995 Roper 37$2495 90 Day Warranty need positive pitch minimal full-flap Stunt ship case some appropriate short having studied Teds rebuttle answered am persuaded changing word article either necessary appropriate Finally Ted correctly said am convinced conventional Stunt ships have less tension flying outside ma neuvers flying inside ones didnt arrive conviction assuming break dancing body positions ing mythical Outside Triangles simple observation anyone can make airplane directly downwind climbing vertically below 450 center traditional Square Eight would pull harder applied up-control 45 applied down-control simple test will divide Stunt fliers Preces sers P-ers Ted have both pointed out now conventionally-configured airplanes stab brings up rear require download tail stability Full-size airplanes carefully designed safe stable minimum payload-destroying download Since jet fuel costs went out sight dont just load 727s within approved CG range longernow try load within economy range GO roughly rear half approved range Id guess full-size conventional aircraft probably carry 3%ZENOAN QUARTZ CUSTOM Dual outlet aluminum muffler Carb rotated needle accessibility cowled Modified Quadra mount 6 bolt prop washer carb linkage 4 Complete assembled shoWn $14495 1516495 wIsuperearterI 5% less payload say flying wing same gross weight wing area Efficiency-wise Stunt ships another class entirely First build superstable airplanes grooooove placing CG balance point much farther ward necessary normal stable flight use large full-span flaps obtain high lift sharp corners coupled flaps create both high lift strong negative pitching moments Without quite knowing build airplanes super-effective stabs powerful elevators practical way lever Stunt ships out grooves sharp turns overcome terrific negative pitching moment full-span flaps arbitrary numbers Ted played around probably overstated case However doubt pay large penalty lost payload capability corresponds reduction G pulling capacity Stunt ships Id guess loss 20%-25% range airplanes high wing loadings big stiff flapsand somewhat less lightly-loaded classics smaller flaps less flap travel suffer real loss potential performance less equally no competitive disadvantage until some sharpie comes along canard stab front well-enough designed pret ty enough overcome judges natural bias against non-conforming airplanes guy just might blow doors off see unlike conventional airplanes stab stable canard actually carries part weight level high-G maneuvering flight canard doesnt suffer penalty downloaded stab gains bonus performance uploaded stab As result canard can carry weight have smaller wing turn tighter Look around guys still flying Fifties technology new age canard flying wing efficiency Interesting efficient new flying machines abound latest bomber Stealth reported flying wing Lockheed has proposed super-efficient canard airliner Nine ties business aviation Beech Star ship Avtec 400 Omacs Laser 300 flying now canards military 162 Model Aviation PK PRODUCTS Specializing Quadra/Zenoah Sales Service PO Box 6226 Hayward CA 94540Tel 415 581 -4277 Eves DEALER INQUIRES INVITED ALL ORDERS ADD $200 POSTAGE & HANDLING CALIF RES ADD SALES TAX viation Northrup X-29A anard has swept-forward wings iell general aviation Burt Rutans opular homebuilt Vari-Eze round-the-world Voyager both Ca ards signs canards will ome Stunt Ls inevitable radical new configurations nay can already see some problems 4th practical developmentand naybe solution First lets look flying wings Pre ision Aerobatics Flapless Combat-ship ke airplanes can never slow accurate recision maneuvers elevators n flying wing deflected upward nitial effect same raising flaps n conventional Stunt ship negative downward liftand lots Next levators change pitch attitude 4ng overall increased lift itched-up wing offsets down force ie elevators sink stops though pitch 411 continue change long levators deflected desired itch attitude reached elevators re neutralized will sort pward bounce airplane elimi ation downward lift short cor ers flown flapless flying wing can ever approximate smooth radius 411 always have funny little sinks bounces Another unusual characteristic lapless flying wing demonstrated early designs semiscale 63B would take off up levator up-elevator applied ground couldnt rotate nose Lpward negative lift created sure 1ued sucker ground fly first pop loose down levator get clear ground hen follow up-elevator subsequent nore-or-less normal flight Trailing edge flaps obviously wont work mn flying wing either think Precision Stunt flying wing would possible sets flush-mounted flaps upper lower wing surfaces located near spar bottom flap would operate up-elevator provide enough lift balance sinking tendency pitch attitude changed vice versa desired pitch attitude obtained flap would retract elevators centered- Positive negative lift would disappear simultaneously bouncing wing spar-mounted flaps wouldnt efficient lift-producers trailing edge flaps should nevertheless work Actually canards will easier design fly CG will still conventionally located just ahead spar Wing design lead-out position will remain unchanged stab will moved front can probably reduced size keep normal near-spar balance point engine will probably have moved rear installed pusher configuration has aerodynamic advantages rear engine push/pull twins like Cessna Skymaster usually has greater thrust improved airflow out prop Aerodynamics will also improved removing propwash SAILPLANES WORLD iSOlA Coffee Rd Modesto CA 95355 airframe biggest problem pusher canards will probably en gine heat have troubles enough cooling Stunt engines directly prop-blasted flow Without blast cooling air supplementary cooling prob ably liquid cooling will required will tough can doneand rewards canard performance improve ment could rich will canard fly Wellllll retract-equipped twin-engined Hornet has ink lines molded-balsa P-47N fuselage finished molded-balsa P-5 lB fuselage Also have some molds finished all-glass Ultimate Spitfire guess what Im trying say personally will have trouble replacing WW II fighters strange new shapes however well may fly innovation creativity experimen tation ridiculous amount effort finally managed make semiscale Stunters fully competitive best todays conventional Stunt ships As survey situation dont believe enough unrealized performance potential left semiscale Stunters compete fully against improved aerodynamics Sailplanes International Krause MultiPlex Wan itschek Wik & Roke Sport-Scale-F3B European Hardware Accessories Send $500 Cat & Price List 209 577-0506 June 1985 163 iddreSS PAY BY CHECK OR MONEY ORDER money orders shipped same day received Send Jeffla Products PO Box 484 Lake Elsinore CA 92330 call 714 674-1151 radically new ships What heck day comes Ill just fly Sea Fury Old-Timer Stunt Al Rabe 1904 Valley Oaks Ct Irving TX 75061 CL Racing/Ballard Continued page 72 must filled tube removed fuel bulb discarded engine restarted Apparently two-andone-half seconds can saved using pressure refueler system am enclosing picture typical problem encoun tered hitting quick-fill fill pipe particular pit man using fingers left hand guide filler pipe quick-fill left hand could attaching battery resetting fuel shutoff competitor has apparently mastered situation Tim Gillott Tim utilizes pressurized fuel system similar Matched Performance system TOP PERFORMANCE K&B ENGINES 16 Airplane 4 Marne K&B FUELSK&B GLOW PLUGS 7 BlenUs4 choices Matched Finish System BEST APPEARANCE K&B FIBERGLASS CLOTH K&B Micro-Balloons FILLER K&B SUPER FOXY RESIN K&B SUPER FOXY THINNER K&R SUPER FOXY PRIMERK&B SUPER FOXY PAINT 66 MIXING CUPS used Team Race competitors uses army ammo belt pint fuel can pressurized either Coleman pump air pump such used RC retractable gear systems tube exits can rubberbanded arm female type TR fitting tank other half mounted Tims middle finger leaves thumb index finger free battery connections So essence tank can filled other two fingers can clamping engage battery leaves right hand completely free reset shutoff flip propeller no bulb needs discarded no problem entering exiting quick-fill tube no way dirt can enter system bulb rolling around ground getting dirt fuel jug area Sport Race tank modifications have several requests concerning reliable tank use Sport Race models big problems find Racers plain-bearing engines tend vibrate causing fuel-foam ing problems very sturdy front nose pod profile fuselage must utilized keep vibration minimum addition found beneficial use clear silicone caulk blue gasket sealer between profile fuselage tank dampen vibration silicone seemed unaffected high- low nitro fuels tank seems useful rectangular tank approxi mately four inches long oneand-one-half inches wide tank must mounted fuel feed tube parallel center needle valve tube needs removed tank bent fuel line tub ing can passed through fuel shutoff kinking also away heat engine Midwest Sport Race rules require A-in fill tube found fill tube worked much bet ter bent air flow tube merely enters inside tank does run back feed line might Uniflow system tube merely sticks down inside front tank bent air stream have found excellent bends can made copper brass tubing us ing Harry Higleys tube-bender vir tually eliminates kinks almost angle bend can easily accomplished transition full empty rectangular tank seems excellent Obviously larger capacity tank engine can set fairly lean fear overheating since fuel shutoff can utilized larger-capacity tank fuel pressure 30 40 laps before pit stop will allow constant needle valve setting Finally find putting tank underneath wing additional silicone damping can used vibra tion-free tank attachment possible putting silicone 6n top section tank building plywood floor particular underside wing area help dampen vibration New products have just seen three new propeller pitch gauges produced Walt Perkins Shadow Racing F IDLflULIL~ three styles Team Race Style Style II The Team Race pitch gauge measures EEUEBIE -in pitch increments designed props 8-in diameter pitches 4 8 Style props 12-in 70 cowls 9 wheelpants tar Sig Pica diameter pitches 3 15 Top-Flue Jemco Nosen Pilot Stattord Radlals BehrensGarmhausen W E Tech andutherkilsand half-pitch increments Style II plans One-piece laminated construction handlaid 24-in diameter propellers 4 14-in liberglass strong lightweight Send BASE tor pitch A-in pitch increments price list please include names models interested parts tar call between DAM -gauges lighter weight 9 PM EDT tor intormatlon COD ordering Wecompact facilitate transportation hope hear youlfield use have permanently photo IBERGLASS 703 890-6017etched scales will rub off gauges can ordered meas jU4ERure pusher props well tractor Opt MA RI Ba 530 Goodvew VA 24095 Continued page 16t 164 Model Aviation FULL LINE METAL SPECIALISTS
Edition: Model Aviation - 1985/06
Page Numbers: 71, 160, 162, 163, 164
Control Line Aerobatics Ted Fancher think youre seeing double month youre almost right two Con trol Line Aerobatics columns time Its because Ted Fancher regular contributing editor subject has expounding things dear heart Al Rabe special con tributor month Both modelers acknowledged experts subject both cling certain beliefs about aerodynamic facts IWe spe cialized type model agreement Whos right MA editorial staff doesnt know have agreed publish Al Rabes thoughts follow interested modeler can read judge himseW/herself Also Al has something say about tail-first designs may set thinking THIS COLUMN being written because Ted Fancher has talking about P factor gyroscopic precession want lay topics rest Im addressing issue time because Ted misquoted columns Now feel important insofar readers Teds column actually incorporate some ideas design and/or construction airplanes hope having nicer-flying craft greater competitive success example few Stunt fliers have tried such things shock-absorbing landing gears significant dihedral movable rudders airplanes have installed bellcranks upside down nearly everyone uses sliding-block/slot ted-wing-tip adjustable lead-out guides idea originated 1968 first published Bearcat construction article 1970 decide features going incorporate new Stunt ship have right evaluate best available information accurately present ed isnt important whether agree Ted differences over P-factor precession long interested receive fair presentation tried present ideas article CL Stunt Design January 1985 issue Model Aviation tried present clearly accurately think Stunt fliers understood ideas until Ted paraphrased substi tuted expression turn obvi ously meant lift certainly no intention suggesting .an air plane would turn ever changing its geometric angle attack Neither did suggest .. lift causes aircraft body angle change Quite contrary RELATIVE 9 WIND F&OATTACK RELATIVE WIND ALTHOUGH WING APPROACHES STALL ASCENDING BLADE. AND DESCENDING BLADE NEAR ThE SAME ANGLE TO THE RELATIVE WIND AND THEREFORE NEAR EQUAL THRUST WITh UTTLE iW Al Rabe discussed two sketches article January 1985 Issue Above Ted Fancher picked up discussion used other drawing Below April 1985 issue After Al Rabe took exception Fanchers remarks so. read AOJA THIS FORCE MUST BE OVERCOME BY THE TAIL BEFORE THE A/C CAN PITCH NOSE UP 4 OG -4 PITCHING MOMENT 5OLBSXI-I/2zz75iNCH/LBS NOSE DOWN simply said necessary change body angle create lift Perhaps will understandable elaborate what think Teds elaboration drawing January article Lets see now Teds drawing April 1985 issue page 67 suggests agrees possible generate 50 pounds lift changing effective angle attack means deflecting flaps necessarily changing body anglebut creating strong nose-down pitching moment near cen ter gravity CG Actually exactly point saw no need compli cate matters farther discussion pitching moments Further atno point did relate lift turn except point out maximum maneuvering ie turning angle attack would reached about same body angle relative wind slow-speed landing body angle illustrate lets add some hypo thetical numbers dimensions Teds April drawing Lets think 50 lb lift apparent 16 Gs 5O-oz Stunt ship sake sweet reason Ill stipulate center lift indeed 1 behind CG does creat 75 in-lb nose-down pitching moment Now lets add horizontal tall surfaces having center lift point say 25 aft aircraft CG controlled flap deflection caused 50 lb lift matched up-elevator deflec tion caused 3-lb download tail 3 lb times 25 results 75 in-lb nose-up moment balancing exactly flaps 75 in-lb nose-down moment result airplane climbs absolutely flat no body angle should point out 3-lb download real weight must carried wings Thus actual effective weight carried wing instant would 98 oz achieved vertical accelera Continued page 160 June 1985 71 50 LBS LIFT ASCENDING BLADE HALLOW ANGLE TO WIND PRODUCING LESS THRUST DESCENDING BLADE TEEP ANGLE TO RELATIVE WIND PRODUCING MORE THRUST AND STRONG LEFT YAW Model Magic Epoxy Plus 2 Part 8 Mm Use anywhere two part epoxy used 25% Lighter Sandable Carveable Excellent Gap Filling Non-Sagging Superior Strength $fl95 Sands Carves like Basswood l 16 81 oz Equal over 8 wt oz regular epoxys See dealer first write call PO Box 19784 St Paul MN 55119 715 425-1397 MODEL MAGIC PRODUCTS 0 Model Magic Filler 0 0 S S Comparison Chart Model Magic Product X Adhesion BalsaEacellent Foam Fiberglasa Strength Flesing Spreading FuelResistance SandingAs med balsa HardnessAs hard balsa FinishingAny finish/covering Shelf Lifetill used up TintAcceptanceExcellent water ResistExcellent 0 very Poor Soft balsa Soft balsa 5-7 inn very Poor Test methods data available request care enough fill very best insist Model Magic Filler Circtie Manic Filler r Super sport flier turnaround pattern esisa Construction 70 span 927 sq area $1 j 759859 lbs 75-12cu Dealer Inquiry Invited 3405 Cleveland Ave SW Canton OH 44707 Send $1 Catalog 1216 4846810 mm~~ROUSH MFG 31-lllllrlb S HANDLING Up $999 add $199 $891 $2909 add $229 $2901 $9590 add $300 $9591 $7099 add $309 over $7909 add $9 001 CA Addressees add 69 tax Send MO visa/McI#Exp Check lallow up 30 days CK clearancel COD Exact Charges plus $159 Hdl ICash Only 84 Page CATALE*uu*S $209 PP/tnt Class espy will oent free--when requested-with order HOBBY HORN 15173 Moran St [A] PO Box 2212 Westminster Ca 92699 1719 8938311 [Aft Nm 719 8951203] 160 Model Aviation Still own opinion flaps have strong effect tracking Particu larly influential spanwise distribu tion As flaps get shorter tracking suf fers Flaps should long span nar row chord Rule Thumb Fancher Flaps should full-span nearly chord should range 15% 20% wing chord depending air craft weight addition hingeline should straight Since Stunter flies constant left skid straight hingeline assures airflow across airfoil consistent possible entire span final design objective Uniformity Turn pitch prime design factor Decalage Decalage fancy term alignment wing tail blunt should no decalage Stunter centerlines wing tail matter thrust line must parallel Any misalignment of either design construc tion will result plane turns dif ferently inside versus outside Dont Secondarily aware locate large draggy parts airplane Uneven vertical distribution drag relative CG will result unequal turns No rules thumb must eyeball side view make educated guess drag distribution same goes drags opposite number thrust Dont mount engine pylon above tail expect ship turn well inside about winds up design phase Next month well preflight get started flying Ted Fancher 158 Flying Cloud Isle Foster City CA 94404 gles Does mean surrender quite As Ted correctly pointed out ineffective tail surfaces elevator pushrod discon nected will cause violent nose-down response up-elevator down-flap control reversed control vengeance extreme deflected flaps create 75 in-lb nose-down mo ment tail surfaces produce 28 lb download 70 in-lb nose-up moment due elevators too small size too little deflection result will still reversed controls violently same flap deflection stronger tail surfaces produced 32-lb download 80 in-lb nose-up moment result would positive nose-up rotation response up-control application Lets put together have Stunt ship wing-bending load 50 lb 3-az change tail download causes turn Its opinion real work situation high ljfl required oppose high 0-loads tight corner Relatively little effort ex pended change body angle relatively little change body angle required airplane turn sharply Once again maneuvering body angle maximum loads should approximate body angle slow-speed stall case full-flap Stunt ship observe body angle such case slight thus insignificant pitchinsignificant P-factor statement does did read No pitchno P simply signs real effects P recognized addressed less importance effect precession applica tion full-flap Stunt ships summarize did suggest _______________________________.. aircr. can make abrupt pitch change. achieving posi CL Aerobatics/Rabetive geometrical angle attack. . did Continued page 71add sufficient proper accurate modi tion would closer 8 Gsfiers various statements such such airplane configuration .dramatically reduce body angle relative wind. t ships possible Id first admit its usually have small body angles land performance would akin stall little nose-up pitch elevator Stunt ship An air- statements flatly suggest plane would incapable Stunt pattern withit positive negative body an- Continued page 162 tilt $595 081 ozl taluezs t,eng Kepair Timer LaNtus 8 Gus axOEL c/I/todd Elt7LcL 9mm IREaKEr -tell eROOKLYN DOOcER 59 cabin WEST Retail $52 95*aINTRoDucToRY PRICE $3909 t930 Recerd Breaker 96 $6956 t939Zipper59$5356 t939 Kioud King 63 $4236 1991 Brigidier 56 $4976 t991 Super Ouaker 79 $7776 1940 So Long 5tS3936 t936 Buccaneer 09 $5996 1938 clipper MKI 72$ill56 1937 Dallaire tOt $7516 t93t Miss America 89 $7196 t991 Playboy Sr 50 $5116 1991 Playboy Jr 59 $3119 1938 Powerhouse 89 $5356 1990 Sailplane 78 $9976 1938 Trenton Terror 72 $9076 1990 Ranger 96$3t 96 1939 Korda Wake 99 $t916 1939 Mercury 72 6 kits qualify SAM events 1FF & RId feature highest quality machine cut & sanded parts Superior competition alt sheet atrip wood wire & window material Plans orig PP models easily convertible 3ch RIC KITS Sailpianes Electric power cas Hobby Horn SENSOAR Clider 78 9sl $1800 Midway Model GNOME RIC Hand Launch Glider$2900 Jolly Models FLINcER RIC HLG 50 Span $2990 Midway Model FAST EDDIE Aerobatic /09 Elec$t990 Jolly Models ELECTRIcUS Electric Clider 95s$3259 Leisure PLAYBOY SR 67 cear 95 Elect $3900 Astro ASTRO SPORT 37 Direct 99 Elect $2290 Leisure WASP 37 far Direct 95 Electrics $2250 Midway ULTRA MK iv 86 far Geared 09 EP $3999 Midway FLYING QUAKER 89 90-959 strake $6976 9ks/Midway DENNY JR 72 Alum camel $9396 9ks/Midwav BUZZARD BOMBSHELL 72$5196 FULL LINE OF ELECTRIC SYSTEMS 9 Parts Avail OTS TS RIOR TS T THE MOST SUPERIOR PILOT FIGURE ON THE MARKET LIGHTEST WEIGHT MOST REALISTIC AVAILABLE GIVE YOUR PLANE PILOT FOR YOUR NEWEST OLDEST OR NEXT CREATION R YOURS TODAY FULL FIGURES CIVILIANWWII MILITARY 1/3 Scale$19951/5 Navy$1395 1/4Scale14951/6AAF1195 1/5 Scale1295Plus 1/12 Scale895$250shipping 1/12Chopper 895each figure KNIGHTS OF THE AIR 7148 Lasting Light Way Columbia MD 21045 301-730-5596 SAVE UP TO 50% famous-make tools hard-to-find items FREE GIFTS valued 514 95 order OVER 1000 ITEMS fully guaranteed MICROMARK Box 5112-6324 E Main St Clinton NJ 08809 DYES Please rush big new catalogI youve ordered us before no need II Well send new cata og automaticallyI NAMEj ADDRESSI CITY __________________ STATE ______ ZIP _________ NewI MK II H & K Superstarters Q-35$2495 Q-50$2495 MAG II$3495 Super Hustler$3495 Zenoah$2495 Tartan Twin$3995 Roper 37$2495 90 Day Warranty need positive pitch minimal full-flap Stunt ship case some appropriate short having studied Teds rebuttle answered am persuaded changing word article either necessary appropriate Finally Ted correctly said am convinced conventional Stunt ships have less tension flying outside ma neuvers flying inside ones didnt arrive conviction assuming break dancing body positions ing mythical Outside Triangles simple observation anyone can make airplane directly downwind climbing vertically below 450 center traditional Square Eight would pull harder applied up-control 45 applied down-control simple test will divide Stunt fliers Preces sers P-ers Ted have both pointed out now conventionally-configured airplanes stab brings up rear require download tail stability Full-size airplanes carefully designed safe stable minimum payload-destroying download Since jet fuel costs went out sight dont just load 727s within approved CG range longernow try load within economy range GO roughly rear half approved range Id guess full-size conventional aircraft probably carry 3%ZENOAN QUARTZ CUSTOM Dual outlet aluminum muffler Carb rotated needle accessibility cowled Modified Quadra mount 6 bolt prop washer carb linkage 4 Complete assembled shoWn $14495 1516495 wIsuperearterI 5% less payload say flying wing same gross weight wing area Efficiency-wise Stunt ships another class entirely First build superstable airplanes grooooove placing CG balance point much farther ward necessary normal stable flight use large full-span flaps obtain high lift sharp corners coupled flaps create both high lift strong negative pitching moments Without quite knowing build airplanes super-effective stabs powerful elevators practical way lever Stunt ships out grooves sharp turns overcome terrific negative pitching moment full-span flaps arbitrary numbers Ted played around probably overstated case However doubt pay large penalty lost payload capability corresponds reduction G pulling capacity Stunt ships Id guess loss 20%-25% range airplanes high wing loadings big stiff flapsand somewhat less lightly-loaded classics smaller flaps less flap travel suffer real loss potential performance less equally no competitive disadvantage until some sharpie comes along canard stab front well-enough designed pret ty enough overcome judges natural bias against non-conforming airplanes guy just might blow doors off see unlike conventional airplanes stab stable canard actually carries part weight level high-G maneuvering flight canard doesnt suffer penalty downloaded stab gains bonus performance uploaded stab As result canard can carry weight have smaller wing turn tighter Look around guys still flying Fifties technology new age canard flying wing efficiency Interesting efficient new flying machines abound latest bomber Stealth reported flying wing Lockheed has proposed super-efficient canard airliner Nine ties business aviation Beech Star ship Avtec 400 Omacs Laser 300 flying now canards military 162 Model Aviation PK PRODUCTS Specializing Quadra/Zenoah Sales Service PO Box 6226 Hayward CA 94540Tel 415 581 -4277 Eves DEALER INQUIRES INVITED ALL ORDERS ADD $200 POSTAGE & HANDLING CALIF RES ADD SALES TAX viation Northrup X-29A anard has swept-forward wings iell general aviation Burt Rutans opular homebuilt Vari-Eze round-the-world Voyager both Ca ards signs canards will ome Stunt Ls inevitable radical new configurations nay can already see some problems 4th practical developmentand naybe solution First lets look flying wings Pre ision Aerobatics Flapless Combat-ship ke airplanes can never slow accurate recision maneuvers elevators n flying wing deflected upward nitial effect same raising flaps n conventional Stunt ship negative downward liftand lots Next levators change pitch attitude 4ng overall increased lift itched-up wing offsets down force ie elevators sink stops though pitch 411 continue change long levators deflected desired itch attitude reached elevators re neutralized will sort pward bounce airplane elimi ation downward lift short cor ers flown flapless flying wing can ever approximate smooth radius 411 always have funny little sinks bounces Another unusual characteristic lapless flying wing demonstrated early designs semiscale 63B would take off up levator up-elevator applied ground couldnt rotate nose Lpward negative lift created sure 1ued sucker ground fly first pop loose down levator get clear ground hen follow up-elevator subsequent nore-or-less normal flight Trailing edge flaps obviously wont work mn flying wing either think Precision Stunt flying wing would possible sets flush-mounted flaps upper lower wing surfaces located near spar bottom flap would operate up-elevator provide enough lift balance sinking tendency pitch attitude changed vice versa desired pitch attitude obtained flap would retract elevators centered- Positive negative lift would disappear simultaneously bouncing wing spar-mounted flaps wouldnt efficient lift-producers trailing edge flaps should nevertheless work Actually canards will easier design fly CG will still conventionally located just ahead spar Wing design lead-out position will remain unchanged stab will moved front can probably reduced size keep normal near-spar balance point engine will probably have moved rear installed pusher configuration has aerodynamic advantages rear engine push/pull twins like Cessna Skymaster usually has greater thrust improved airflow out prop Aerodynamics will also improved removing propwash SAILPLANES WORLD iSOlA Coffee Rd Modesto CA 95355 airframe biggest problem pusher canards will probably en gine heat have troubles enough cooling Stunt engines directly prop-blasted flow Without blast cooling air supplementary cooling prob ably liquid cooling will required will tough can doneand rewards canard performance improve ment could rich will canard fly Wellllll retract-equipped twin-engined Hornet has ink lines molded-balsa P-47N fuselage finished molded-balsa P-5 lB fuselage Also have some molds finished all-glass Ultimate Spitfire guess what Im trying say personally will have trouble replacing WW II fighters strange new shapes however well may fly innovation creativity experimen tation ridiculous amount effort finally managed make semiscale Stunters fully competitive best todays conventional Stunt ships As survey situation dont believe enough unrealized performance potential left semiscale Stunters compete fully against improved aerodynamics Sailplanes International Krause MultiPlex Wan itschek Wik & Roke Sport-Scale-F3B European Hardware Accessories Send $500 Cat & Price List 209 577-0506 June 1985 163 iddreSS PAY BY CHECK OR MONEY ORDER money orders shipped same day received Send Jeffla Products PO Box 484 Lake Elsinore CA 92330 call 714 674-1151 radically new ships What heck day comes Ill just fly Sea Fury Old-Timer Stunt Al Rabe 1904 Valley Oaks Ct Irving TX 75061 CL Racing/Ballard Continued page 72 must filled tube removed fuel bulb discarded engine restarted Apparently two-andone-half seconds can saved using pressure refueler system am enclosing picture typical problem encoun tered hitting quick-fill fill pipe particular pit man using fingers left hand guide filler pipe quick-fill left hand could attaching battery resetting fuel shutoff competitor has apparently mastered situation Tim Gillott Tim utilizes pressurized fuel system similar Matched Performance system TOP PERFORMANCE K&B ENGINES 16 Airplane 4 Marne K&B FUELSK&B GLOW PLUGS 7 BlenUs4 choices Matched Finish System BEST APPEARANCE K&B FIBERGLASS CLOTH K&B Micro-Balloons FILLER K&B SUPER FOXY RESIN K&B SUPER FOXY THINNER K&R SUPER FOXY PRIMERK&B SUPER FOXY PAINT 66 MIXING CUPS used Team Race competitors uses army ammo belt pint fuel can pressurized either Coleman pump air pump such used RC retractable gear systems tube exits can rubberbanded arm female type TR fitting tank other half mounted Tims middle finger leaves thumb index finger free battery connections So essence tank can filled other two fingers can clamping engage battery leaves right hand completely free reset shutoff flip propeller no bulb needs discarded no problem entering exiting quick-fill tube no way dirt can enter system bulb rolling around ground getting dirt fuel jug area Sport Race tank modifications have several requests concerning reliable tank use Sport Race models big problems find Racers plain-bearing engines tend vibrate causing fuel-foam ing problems very sturdy front nose pod profile fuselage must utilized keep vibration minimum addition found beneficial use clear silicone caulk blue gasket sealer between profile fuselage tank dampen vibration silicone seemed unaffected high- low nitro fuels tank seems useful rectangular tank approxi mately four inches long oneand-one-half inches wide tank must mounted fuel feed tube parallel center needle valve tube needs removed tank bent fuel line tub ing can passed through fuel shutoff kinking also away heat engine Midwest Sport Race rules require A-in fill tube found fill tube worked much bet ter bent air flow tube merely enters inside tank does run back feed line might Uniflow system tube merely sticks down inside front tank bent air stream have found excellent bends can made copper brass tubing us ing Harry Higleys tube-bender vir tually eliminates kinks almost angle bend can easily accomplished transition full empty rectangular tank seems excellent Obviously larger capacity tank engine can set fairly lean fear overheating since fuel shutoff can utilized larger-capacity tank fuel pressure 30 40 laps before pit stop will allow constant needle valve setting Finally find putting tank underneath wing additional silicone damping can used vibra tion-free tank attachment possible putting silicone 6n top section tank building plywood floor particular underside wing area help dampen vibration New products have just seen three new propeller pitch gauges produced Walt Perkins Shadow Racing F IDLflULIL~ three styles Team Race Style Style II The Team Race pitch gauge measures EEUEBIE -in pitch increments designed props 8-in diameter pitches 4 8 Style props 12-in 70 cowls 9 wheelpants tar Sig Pica diameter pitches 3 15 Top-Flue Jemco Nosen Pilot Stattord Radlals BehrensGarmhausen W E Tech andutherkilsand half-pitch increments Style II plans One-piece laminated construction handlaid 24-in diameter propellers 4 14-in liberglass strong lightweight Send BASE tor pitch A-in pitch increments price list please include names models interested parts tar call between DAM -gauges lighter weight 9 PM EDT tor intormatlon COD ordering Wecompact facilitate transportation hope hear youlfield use have permanently photo IBERGLASS 703 890-6017etched scales will rub off gauges can ordered meas jU4ERure pusher props well tractor Opt MA RI Ba 530 Goodvew VA 24095 Continued page 16t 164 Model Aviation FULL LINE METAL SPECIALISTS