Editors Note would remiss make special note excellent design Mi Palumbo deserves high praise execution specialized aircraft An aeronautical engineer able gild lily wing design really does improve stability perform ance skilledflier can realistically appraise creation hands others priar efforts have made direction magazines including so-called sport 40-powered aerobatic jobs Sunday fliers usually too often merely smaller standard pattern machines believe can recommend reservation appears right IN DESIGNING Alpha objective come up easy-to-build racy looking air plane having full aerobatic capabilities standard engine nonretractable trike gear primary motivation provide relatively inexpensive answer interested develop ing skills aerobatic fliers Note said aerobatic fliers necessarilypattenz fliers though Alpha will perform maneuvers required AMA Masters pattern believe lots fliers like myself have 36 Model Aviation sport flier difference size between 40/60 jobs great remains con scious comparison sport fliers enjoy aerobatics own sakewithout superexcessive power loadings switching gadgetry So designer opted fixed gear FULL SIZE PLANS AVAILABLE SEE PAGE 128 IVOO VA CE OHEeLESCe V4OVELHMSSWVT SECT1VA IVO 00 HOLLOWED WOVE I4O IT HUASMEST IRE CLV WOVO 4WAE EWORALASS RBHANSONVEOLO TWANALETRUMNOSVAPSTWP SRN4SO VEOVO VS V 00 ALEROS VHMOPV OuTLAW -I-z~~ -MJAL kVI E4HARO SleET 1~ IVHHARO SHEET VIVEOHAL OOEAVTSOSOMASIC WIRE [v32][b-1-10-1-10]] I OV 2 MO OPPSOT\\-SHESOEET SIXES RE C SI104OASO SHEET ALL SWS S/HESROEV SA WEO SLOVO- ALL PHOL USE HAT LEAOVVT LOR SHEETHOOLSE LYE PLOWOHO VOTSW, OTRIASHE OnE SHEET H OH HIA ROT-H HASHjfljflVP 3HOH 02 EOVSES SE SE UROTTVVHTLVEVSJIOVTL ESTIOHPLVVSEOOHO S 0~-5iTVEH -STEERAWFILLET HATLAW3OSOSSEET MOORLES ----~- 1-I SE 5 --EWO LMTT LIMIT-EHTSWWOLEHOHHHEE V104 PLYWOHO TVSWLOVH HOLLOAEO-LV2SHEETMAIN HOAR SVSAUVSIV WE AWEEESESH HVWTSIAAOLE 5SLOVEVV-HO SOLOS MOLTSV4TSIMWLE 055 WN WY DOWIC J PALUSMOO LENATO OW 5 --OR PLTWHOE 5 IC PLTWHOO ItS PLYHOVO ENHIHE WOAST SAL ION MAPLE neither time nor desire nor bankroll necessary become serious contenders pattern competition so-called sport fliers enjoy aerobatic flying its own sake its purest form super-excessive power loadings electronic switching gadgetry So Alpha dosigned look fast fly fast yield snappy per formance cost much less typical full-blown pattern aircraft Evolution Design Among factors enter design highly aero batic aircraft two stand out important namely drag weight aircraft unique compromise very important factors vertical maneuver capabilities aerobatic aircraft must pos sess make two factors increasingly important Enya 45 mounted long bearers strengthen nose way back L E. fits like hand ins glove Considering drag weight pararosount factors require unique compromise aircraft especially vital vertical maneuvershis clean configuration achieved weight 45 lbs. including radio April 1980 37 Seen beneath handling pushrod exits split elevators horns etc. self- evident cruciform fairing intersection hori zontal vertical surfaces often seen good aircraft Hence effort has made keep Alpha light possible maintaining sufficiently sound structural strength take high Gs imposed during maneuvering Drag has minimized presenting small frontal area practical oncoming flow stream lining contours wherever possible desire use fixed conventional tricycle gear primarily keep expense weight minimum extra effort required keep airframe drag down fuselage lines very similar Bridi UFO RCM Sept 77 graceful lines strikingly beautiful aircraft provided inspira tion Alphas lines side view dupli cated closely possible maintaining proper moments lateral area distribution insure balance ballast good knifeedge flight characteristics suppose should mention time hold Doctorate Aeronautics have designed scratch-built over 20 original RC aircraft past seven years professional experience field airfoil design put good use Alphas predecessors progressive airfoils used designing Alphas wing coupled particular wing planform chosen eliminates possibility tip stall provides lift distribution mini mizes loading root net advantage slender wing can built much lighter will see aerobatic aircraft size extra effort spent designing structure paid off overall weight Cirrus radio 45 pounds resulting comparatively low wing loading makes nice slow landings very smooth takeoffs fact could install retracts thats bag still have wing loading nice-and-easy category Flight characteristics will discussed later current list prices materials should cost about$3000 Hardware i e nosegear assembly LG wire control horns devises nyrod fuel tank will cost about $600 Editors Note Since article written prices may 10% 15% higher quoted Fuselage Cut 3/32 sides cement 3/32 doubler cross-grain nose aft Station 3 shown plans Cement 3/32 X eron aft ofStation3 stab LE position( Station 5 make cut-out fuselage sides time 2 Locate former stiffener locations sides Draw lines perpendicular straight fuselage top edge locations 3 Cement iangle stock fuselage sides shown plans Fit cement stiffeners sides Stations4 andS 4 Cut out formers trial fit fuselage sides appropriate locations Insure snug flush fit glue joints Cut out engine rails trial fit formers 1 and2 Drill holes Temporarily mount nose-gear bracket former 1 backdrill holes fuel lines through nylon bracket Remove nose-gear after doing 5 Locate centerline ofa3/16 X 3 sheet balsa Overlay fuselage top view trace outside profile former locations Trim aft ends triangle stock cemented fuselage sides aft fuselage sides will join properly taiL 6 Cut away excess 3/16 top sheet Epoxy formers 1 2 3 top down top sheet flat building surface Insure squareness top sheet centerline centerline position formers After epoxy has set epoxy engine rails formers 1 2 7 Apply liberal coat epoxy former sides sides engine rails Apply cement top triangle longerons Assemble fuselage sides top sheet pin necessary Apply cement inside surfaces trimmed triangle stock tail clamp place ensuring squareness fuse lage sides building surface Pull nose together against engine rails clamp 8 Coat inside fuel tank compartment epoxy after trial fitting recommended tank Also coat interior surfaces engine com partment epoxy 9 Trial fit pushrods Nyrods used cement cross bracing locations 3 4 5 Sheet lower fuselage aft Station 3 cross-grain 3/32 sheet 10 Install nose-gear bearing throttle steer ing pushrods Nyrod flex cable recommended Insure clearance steering arm trim needed clear fuselage sides 11 Locate centerline chin block Locate centerline block over center lines formers 1 2 Pull nose together ensuring 2 dimension across top sur face engine rails nose centered chin block Scribe outline nose chin block Trace side view chin block plans Trim excess balsa hollow chin block shown 12 Coat entire inside surface chin block epoxy Set aside dry Locate engine engine rails leaving rance between spinner forward face sides Drill holes engine through engine rails Install blind mounting nuts 13 Epoxy chin block fuselage Square off forward face respect flat building surface Epoxy 1/16 ply spinner ring fuselage 14 Coat a section top nose block inside surface epoxy cement fuselage 15 Carve nose fuselage shape Make cut outs necessary clear engine muffler installation Wing 1 Block up E over plan 4 positions using 1-in blocks 2 Block up ileron spar over plan four positions using 1-in blocks Continued page 116 38 Model Aviation Viewed several angles Alpha exhibits points interest whiclt final analysis answer great question Should build designer used progressive airfoils particular planform eliminate tip stalls providing lift distribution minimum loading root advantage being lighter slender wing aerobatic craft POWR-MITE DUAL SHAFT SANDER* Plus 2fl0 Shppr FACTORY DIRECT Thousands sold 3995 compact high quality bench model disc sander general hobby use Double ended motor shaft grinding wheel drum sander buffer can attached disturbing motor warranty rlC 110/120 volts AC U year limited FREE $500 CERTI FICATE UL approved motor U Fully adjustable tilt table limited time sander will contain coupon good Fully assembled bench tested $500 worth accessoriessand Large over 12 sqinches sanding area ing disc grinding wheel etc shown grindino wheel artuohed ting arbor rod sndng wheel no insloderl P0 Box 5 2294 Mimosa Lane POWRMITELake Havasu City AZ 96403 ENIIRPRISIS602855-31a5 NEW Ducted Fan RC Scale Plans in/spanlength price SR 71 reconnaissance 1 le2400r45engines5541077 $3250 F9F5 PantherDynajetor Fan3554g51450 F86D Sabre" 43471450 F8 Crusader" 38531450 u2 Spyplane 1035251450 F86L Sabreuc Dynajet only373751250 F4J PhantomRC 51450 Propeller Driven P38 LightningRC 2 4045 eng52381250 P39 AiracobreRC 2 4580 51441250 P40 MarhaukRC 24560 37531751250 P828 Twin MustangRC 2 2540 523651250 177 Cessna CardinalRC eo engine725551250 Plans Full Size Working Plans Prices subject $150 first-class postage pay check allow 10 days Send check money order RALPH SALDIVAR 1608 LANDES Ct MODESTO CA 95350 USA 44055 ZiS 2828354 Indoorsupplies balsa rubber microfilm misc Scale rubberpower kits Mfgr Moody C P Lucky see CPM Products Mooney Waft 2912 Cabrillo Mesa Dr. San Diego CA 92123 Plight-toted Peanut Scale piano three sets 14 set plus non-Peanut $5/oct ppd NFFS Plane Publications Teraian Fred 4858 Moorpark Ave. San Jose CA 95129 Plans galore NPFS Symposium reports NFFS Digest beck issues world champs plans book Misc NFF5 supplies IThomlsson Marty aod Karen 2012 Landos Ln. Sacramento CA 95826 916 451-1076 Misc Pf sopplies sorts Noonan Jim see Oldtimer Models OK Engines PO Boo 40 Mohawk NY 13407 Engines parts sew used OK other brands Ignition parts Oldtimer Models Jim Noonan POSes 18002 Milwaukee WI 5321a Misc plans kits supplies publications Oldtimer scale modern Robber balsa tissue Mfgr Cat SOc P & W Model Service see Hobby Horn Packard ET. see Cleveland Model fr Supply Co Peck Polymers Peck Bob Sandy PO Boo 2498 La Mesa CA 92041 714 459-8875 714 442-4838 Misc robberpower COa kits plans parts supplies Peanut Scale Brown engines rubber Mfgr Performance Model Parts Inc Dye Itlen R 1015 S 8th St. Minneapolis MN 55415 612 3393805 TWA cogines Special parts Coo Ross Mlgr Pinto Joe end Maria see NFF5 Supplies Plotake Ron see Aerolite Model supplies 116 Model Aviation Pond John Old Time Plan Service P0600 3215 San Jose CA 85156 408 292-3382 Hundreds plans fur old-timer models description RM Enterprises Hutehinson Tom Rosemary 3255 NW Crocker In. Albany OR 87321 Kits Ultimate Orugmasrer A2 glider Maccrick 4A gas Zingo PAl Power Mfgr Race-Wings see Cloudhuster Venture Schmidt Custom Kits 11948 Franklin Blvd. Elk Grove CA 95824 916 685-3627 after 8 pm Short kits old-timers John Ponds list Y 0 props Redwood spruce strip Sckroedter George see Champion Model Products Shipton Dave end Mary Ann see Hobby Hideaway Simpson Gene see Kinco Sknjeec Gerald A. see Micro-X Products Sliff Bob see Hobby Horn Small Parts Inc. 6901 NE Third Ave. Miami FL 33138 Snerything imatinable small hardware Tubing screws mci mntric gears washers Superior Aircraft Materials Taibi Mike PO Boo 8082 Long Beach CA 80808 Balsa sizestrades quantltiec Die cuttingforkit manufacturers Mfgr SwenAl R Swenson Dick 7373 N Teatonia Apt 9 Milwaukee WI 53209 Alloy engine pan-mount PAl power Swenson Dick see SmenAIR TWA Engines see Performance Model Parts Inc Taibi Mike see Superior Aircraft Materials Teruien Fred see NFFS Plane end Publicatboos Thompeon Marty Karen see NFF5 Supplies Tobia Frank see Franks Hobbies Toner Edward J see Buzzer Model Airplane Co Tumer Ed 3544 Granada Dr. Fort Worth TX 76118 Czech-made Russian-type towline glider launching device Cur rently ocr stock VI prodacts 7871 Alebawa Ave #16 Canoga Park CA 91304 Electric propulsion flight ground support systems supplies kits Hytork 48 motor nicads Vista Labs see VI Products Waldner Arnold see K W Enterprises Wallock Gene see Hobby Horn Wrlliamn Bros. Inc 181 Pawnee St. San Maroon CA 92069 714 748-3082 Plastic acces scale models tngines mach guns wheels pilots props etc Mfgr V and 0 Props see Bills Mail Order Hobby Zaic C Co. Inc Jetco 883 Lexington Ave. Brooklyn NY 11221 Kitofor PP Sport Fpccmpetrtion classes Peanut EmbryoAt A2 HL gliders VaA Gas Gas Scale Mfgr Zaic Frank see Junior Aero Space Co Bob Meuser 4200 Gregory St Oakland CA 94619 Aipha/Palumbo Continued page 38 3 Using square project locations ribs up plan mark locations LE aileron spar Mark off centerline LE aileron spar rib location 4 Glue ribs between LE aileron spar centerline rib coincides centerlines LE aileron spar location Insure squareness ribs building surface using square 5 Cement 5/4 X oubler between Ri R2 6 Cement pruce spars notches ribs 7 Cement 1/16 balsa LE TE sheeting right-hand wing panel cut-outs R2 R3 R4 LG block facing down also sheet centersection Ri R4 before turning panel over 8 Turn panel over Reposition support blocks sheet LE TE 9 To make left-hand panel repeat steps 1 through 7 except now cut-outs R2 R3 R4 will face up sheet center section before turning left panel over Turn left panel over reposition support blocks sheet LE TE Sheet centersection 10 youve followed instructions correctiy up point should have right left wing panel top centersection sheeted bottom centersection sheeted Now epoxy 1/16 ply rib doublers R2 R4 11 Install LG blocks trunnion blocks 38in triangle either side 1/16 ply dowel support between spars between Ri R2 Trial fit 5/32 LG before sheeting undersides panel Note centersection sheeting over underside should extend out end LG block about nd R4 12 Cement Xl/16 cap strips R5 through Ri 1 Wing tip blocks carved hollowed cemented paneL 13 Bend torque rods ailerons using se piece 5/32 aluminum tubing bearing around torque rods ill fit very nicely standard piece K&S 5/32 tubing Notch trailing edge stock accept torque rods 14 Cement trailing edge torque rods inserted wing panels extremely careful point insure trailing edge positioned symmetrically about centerline airfoil section before glue hardens Use masking tape make sure position TE does change glue hardens 15 Trial fit ailerons wing panels Insert hinges aileron spars locate corresponding slots ailerons Drill notch inboard sections ailerons accept torque rods Make sure ailerons move easily before final installation 16 Before joining wing panels shape LE carefully sand dihedral angle center joint paneL Cement ignment blocks panels Apply epoxy joining surfaces cement panels together Cover centersection joint 4-in wide piece 6 oz fiberglass filled epoxy resin Tail Surface 1 Cut vertical horizontal stabilizers balsa sheet Taper elevator rudder shape fin stab leading edges form airfoil-like contour 2 Install pin hinges stationary portion make corresponding slots elevator rudder accept hinges 3 Cement -in pine insert rudder control horn shown plan flap control horn used join elevator halves no pine insert need used 3/32 MW used cement pine insert elevator halves control horn location desired 4 Install elevator joiner flap control horn elevator halves insure alignment two halves drill oversized hole joiner fill epoxy join flat surface covered wax paper 5 The elevator permanently hinged ward stab centerpiece epoxied place Coating joiner Vaseline prior epoxy ing centerpiece place will insure joiner epoxied stab Final AssembIy 1 Final shape rear top portion fuselage Cut -in slots horizontal stab shown plan Cement horizontal stab fuselage True align ment obtained laying fuselage its top over plan locating elevator hinge line over location shown plan fuselage top flat building surface place piece scrap 3/16 balsa under end stab pin everything down 2 The sub-fin cemented fuselage horizontal stab drying Shape rear lower fuselage prior gluing sub-fin place Insure squareness sub-fin building surface insure centered fuselage 3 The -in plywood wing hold-down now cemented fuselage sure epoxy -in triangular stock pieces junctions between fuselage sides former number 3 4 Locate centerline wing over centerline fuselage Insure precisely same height off building surface leading trailing edges will yield zero incidence Adjust fuselage cut-outs accordingly insure true alignment horizontal stab 5 Locate holes leading edge hard dowels Drill s way through 1/16 plywood dowel supports aft main spars Insert dowels epoxy place 6 With wing properly aligned drill number seven holes location nylon bolts Drill through -in hold-down plate Remove wing tap holes hold-down plate -20 tap open holes wing trail ing edge Replace wing bolt place using -20 nylon bolts Fairings FILL FUEL PUMP PUMPS IN0GENERATION AND OUT ONLY $4fl95DU-BRO FUEL HAND IVPUMPS- SONICALLY OPERA TEDSEALED TO PREVENT CAT NO 191-II BLACK PUMP-ULTRA SMALL AND FOR GLO-FUELSCOMPACT--UNIQUE CLIP-ON MOUNTING SYSTEM FITS ON GALLON QUART OR PINT CAT NO 250-IGH RED PUMP-VOLUME FOR GAS/OIL MIXTURESCOMPLETE FUELING SYSTEM INCLUDES CAP FITTINGS FUEL -TUBING AND FILTER I~jDUBRO PRODUCTS INCORPORATED 480 Banner Road Wauconda IIInois 60064 USA leading trailing edges built up sanded shape 7 Cement fin canopy blocks fuselage insuring properly centered Sand shape fuselage contours shown plans build up fillets desired using favorite gunk prefer Epoxolite 8 Apply favorite finish keep light possible 9 Install landing gear fuel tank engine pushrods Make sure nose wheel adjusted wing sits zero incidence level grounJ case Install radio achieve de sired CG location Locate CG fore desired position shown plans less sensitivity elevator deflection Full aerobatic capabilities exist CG positioned shown Finishing Use favorite method keep light possible used Solarfilm cover wing tail surfaces fuselage covered silk three coats clear dope two coats Formula-U Flying Alpha Alpha tracks like shes riding rails Flat-out air speed 70 mph landing airspeed mere 20 mph standard Enya 45 Tatone muffler needed Several props tried including Zinger 10-6 Top Flite 10-6 11-4 both Standard Super-M Tornado Nylon 10-6 Top Flite Nylon 10-6 Best performance obtained Standard Top Flite 10-6 noted several flights made using Enya 45 muffler noticeable increase performance evident upon switching Tatone muffler tuned pipe would probably increase effective power output bother since aircraft capable Masters pattern maneuvers pipe As aircraft sensitivity controls strong function CG location Fore aft limits shown plan having tested aircraft locations between limits position shown recommend Further aft plane too sensitive elevator deflection wind gusts forward leads sluggish response elevator spins resemble vertical diving rolls moderately flat spin achieved CG positioned shown full up elevator oppo site rudder aileron Recovery extremely quick smooth upon neutralizing controls Snap-rolls pose no problem Perhaps impressive stall turns have ever seen achieved Alpha Apply rudder fraction second before throttling back watch Alpha flatest turns youll ever observe Inverted flight characteristics knife-edge flight characteristics good no observable bad tendencies slight amount up elevator required knife-edge position keep plane tracking straight Build Alpha properly youre some very pleasant aerobatic flying fraction cost Pendulums/H aight Continued page 42 Jack has similar success Beechcraft since revamped pendulum system since aircraft flies much higher speed speaks well systems ability overcome effects centrifugal force has mentioned thought possible peril brought about installation pendulums horizontal mode Continued page 120 April1980 117
Edition: Model Aviation - 1980/04
Page Numbers: 36, 37, 38, 116, 117
Editors Note would remiss make special note excellent design Mi Palumbo deserves high praise execution specialized aircraft An aeronautical engineer able gild lily wing design really does improve stability perform ance skilledflier can realistically appraise creation hands others priar efforts have made direction magazines including so-called sport 40-powered aerobatic jobs Sunday fliers usually too often merely smaller standard pattern machines believe can recommend reservation appears right IN DESIGNING Alpha objective come up easy-to-build racy looking air plane having full aerobatic capabilities standard engine nonretractable trike gear primary motivation provide relatively inexpensive answer interested develop ing skills aerobatic fliers Note said aerobatic fliers necessarilypattenz fliers though Alpha will perform maneuvers required AMA Masters pattern believe lots fliers like myself have 36 Model Aviation sport flier difference size between 40/60 jobs great remains con scious comparison sport fliers enjoy aerobatics own sakewithout superexcessive power loadings switching gadgetry So designer opted fixed gear FULL SIZE PLANS AVAILABLE SEE PAGE 128 IVOO VA CE OHEeLESCe V4OVELHMSSWVT SECT1VA IVO 00 HOLLOWED WOVE I4O IT HUASMEST IRE CLV WOVO 4WAE EWORALASS RBHANSONVEOLO TWANALETRUMNOSVAPSTWP SRN4SO VEOVO VS V 00 ALEROS VHMOPV OuTLAW -I-z~~ -MJAL kVI E4HARO SleET 1~ IVHHARO SHEET VIVEOHAL OOEAVTSOSOMASIC WIRE [v32][b-1-10-1-10]] I OV 2 MO OPPSOT\\-SHESOEET SIXES RE C SI104OASO SHEET ALL SWS S/HESROEV SA WEO SLOVO- ALL PHOL USE HAT LEAOVVT LOR SHEETHOOLSE LYE PLOWOHO VOTSW, OTRIASHE OnE SHEET H OH HIA ROT-H HASHjfljflVP 3HOH 02 EOVSES SE SE UROTTVVHTLVEVSJIOVTL ESTIOHPLVVSEOOHO S 0~-5iTVEH -STEERAWFILLET HATLAW3OSOSSEET MOORLES ----~- 1-I SE 5 --EWO LMTT LIMIT-EHTSWWOLEHOHHHEE V104 PLYWOHO TVSWLOVH HOLLOAEO-LV2SHEETMAIN HOAR SVSAUVSIV WE AWEEESESH HVWTSIAAOLE 5SLOVEVV-HO SOLOS MOLTSV4TSIMWLE 055 WN WY DOWIC J PALUSMOO LENATO OW 5 --OR PLTWHOE 5 IC PLTWHOO ItS PLYHOVO ENHIHE WOAST SAL ION MAPLE neither time nor desire nor bankroll necessary become serious contenders pattern competition so-called sport fliers enjoy aerobatic flying its own sake its purest form super-excessive power loadings electronic switching gadgetry So Alpha dosigned look fast fly fast yield snappy per formance cost much less typical full-blown pattern aircraft Evolution Design Among factors enter design highly aero batic aircraft two stand out important namely drag weight aircraft unique compromise very important factors vertical maneuver capabilities aerobatic aircraft must pos sess make two factors increasingly important Enya 45 mounted long bearers strengthen nose way back L E. fits like hand ins glove Considering drag weight pararosount factors require unique compromise aircraft especially vital vertical maneuvershis clean configuration achieved weight 45 lbs. including radio April 1980 37 Seen beneath handling pushrod exits split elevators horns etc. self- evident cruciform fairing intersection hori zontal vertical surfaces often seen good aircraft Hence effort has made keep Alpha light possible maintaining sufficiently sound structural strength take high Gs imposed during maneuvering Drag has minimized presenting small frontal area practical oncoming flow stream lining contours wherever possible desire use fixed conventional tricycle gear primarily keep expense weight minimum extra effort required keep airframe drag down fuselage lines very similar Bridi UFO RCM Sept 77 graceful lines strikingly beautiful aircraft provided inspira tion Alphas lines side view dupli cated closely possible maintaining proper moments lateral area distribution insure balance ballast good knifeedge flight characteristics suppose should mention time hold Doctorate Aeronautics have designed scratch-built over 20 original RC aircraft past seven years professional experience field airfoil design put good use Alphas predecessors progressive airfoils used designing Alphas wing coupled particular wing planform chosen eliminates possibility tip stall provides lift distribution mini mizes loading root net advantage slender wing can built much lighter will see aerobatic aircraft size extra effort spent designing structure paid off overall weight Cirrus radio 45 pounds resulting comparatively low wing loading makes nice slow landings very smooth takeoffs fact could install retracts thats bag still have wing loading nice-and-easy category Flight characteristics will discussed later current list prices materials should cost about$3000 Hardware i e nosegear assembly LG wire control horns devises nyrod fuel tank will cost about $600 Editors Note Since article written prices may 10% 15% higher quoted Fuselage Cut 3/32 sides cement 3/32 doubler cross-grain nose aft Station 3 shown plans Cement 3/32 X eron aft ofStation3 stab LE position( Station 5 make cut-out fuselage sides time 2 Locate former stiffener locations sides Draw lines perpendicular straight fuselage top edge locations 3 Cement iangle stock fuselage sides shown plans Fit cement stiffeners sides Stations4 andS 4 Cut out formers trial fit fuselage sides appropriate locations Insure snug flush fit glue joints Cut out engine rails trial fit formers 1 and2 Drill holes Temporarily mount nose-gear bracket former 1 backdrill holes fuel lines through nylon bracket Remove nose-gear after doing 5 Locate centerline ofa3/16 X 3 sheet balsa Overlay fuselage top view trace outside profile former locations Trim aft ends triangle stock cemented fuselage sides aft fuselage sides will join properly taiL 6 Cut away excess 3/16 top sheet Epoxy formers 1 2 3 top down top sheet flat building surface Insure squareness top sheet centerline centerline position formers After epoxy has set epoxy engine rails formers 1 2 7 Apply liberal coat epoxy former sides sides engine rails Apply cement top triangle longerons Assemble fuselage sides top sheet pin necessary Apply cement inside surfaces trimmed triangle stock tail clamp place ensuring squareness fuse lage sides building surface Pull nose together against engine rails clamp 8 Coat inside fuel tank compartment epoxy after trial fitting recommended tank Also coat interior surfaces engine com partment epoxy 9 Trial fit pushrods Nyrods used cement cross bracing locations 3 4 5 Sheet lower fuselage aft Station 3 cross-grain 3/32 sheet 10 Install nose-gear bearing throttle steer ing pushrods Nyrod flex cable recommended Insure clearance steering arm trim needed clear fuselage sides 11 Locate centerline chin block Locate centerline block over center lines formers 1 2 Pull nose together ensuring 2 dimension across top sur face engine rails nose centered chin block Scribe outline nose chin block Trace side view chin block plans Trim excess balsa hollow chin block shown 12 Coat entire inside surface chin block epoxy Set aside dry Locate engine engine rails leaving rance between spinner forward face sides Drill holes engine through engine rails Install blind mounting nuts 13 Epoxy chin block fuselage Square off forward face respect flat building surface Epoxy 1/16 ply spinner ring fuselage 14 Coat a section top nose block inside surface epoxy cement fuselage 15 Carve nose fuselage shape Make cut outs necessary clear engine muffler installation Wing 1 Block up E over plan 4 positions using 1-in blocks 2 Block up ileron spar over plan four positions using 1-in blocks Continued page 116 38 Model Aviation Viewed several angles Alpha exhibits points interest whiclt final analysis answer great question Should build designer used progressive airfoils particular planform eliminate tip stalls providing lift distribution minimum loading root advantage being lighter slender wing aerobatic craft POWR-MITE DUAL SHAFT SANDER* Plus 2fl0 Shppr FACTORY DIRECT Thousands sold 3995 compact high quality bench model disc sander general hobby use Double ended motor shaft grinding wheel drum sander buffer can attached disturbing motor warranty rlC 110/120 volts AC U year limited FREE $500 CERTI FICATE UL approved motor U Fully adjustable tilt table limited time sander will contain coupon good Fully assembled bench tested $500 worth accessoriessand Large over 12 sqinches sanding area ing disc grinding wheel etc shown grindino wheel artuohed ting arbor rod sndng wheel no insloderl P0 Box 5 2294 Mimosa Lane POWRMITELake Havasu City AZ 96403 ENIIRPRISIS602855-31a5 NEW Ducted Fan RC Scale Plans in/spanlength price SR 71 reconnaissance 1 le2400r45engines5541077 $3250 F9F5 PantherDynajetor Fan3554g51450 F86D Sabre" 43471450 F8 Crusader" 38531450 u2 Spyplane 1035251450 F86L Sabreuc Dynajet only373751250 F4J PhantomRC 51450 Propeller Driven P38 LightningRC 2 4045 eng52381250 P39 AiracobreRC 2 4580 51441250 P40 MarhaukRC 24560 37531751250 P828 Twin MustangRC 2 2540 523651250 177 Cessna CardinalRC eo engine725551250 Plans Full Size Working Plans Prices subject $150 first-class postage pay check allow 10 days Send check money order RALPH SALDIVAR 1608 LANDES Ct MODESTO CA 95350 USA 44055 ZiS 2828354 Indoorsupplies balsa rubber microfilm misc Scale rubberpower kits Mfgr Moody C P Lucky see CPM Products Mooney Waft 2912 Cabrillo Mesa Dr. San Diego CA 92123 Plight-toted Peanut Scale piano three sets 14 set plus non-Peanut $5/oct ppd NFFS Plane Publications Teraian Fred 4858 Moorpark Ave. San Jose CA 95129 Plans galore NPFS Symposium reports NFFS Digest beck issues world champs plans book Misc NFF5 supplies IThomlsson Marty aod Karen 2012 Landos Ln. Sacramento CA 95826 916 451-1076 Misc Pf sopplies sorts Noonan Jim see Oldtimer Models OK Engines PO Boo 40 Mohawk NY 13407 Engines parts sew used OK other brands Ignition parts Oldtimer Models Jim Noonan POSes 18002 Milwaukee WI 5321a Misc plans kits supplies publications Oldtimer scale modern Robber balsa tissue Mfgr Cat SOc P & W Model Service see Hobby Horn Packard ET. see Cleveland Model fr Supply Co Peck Polymers Peck Bob Sandy PO Boo 2498 La Mesa CA 92041 714 459-8875 714 442-4838 Misc robberpower COa kits plans parts supplies Peanut Scale Brown engines rubber Mfgr Performance Model Parts Inc Dye Itlen R 1015 S 8th St. Minneapolis MN 55415 612 3393805 TWA cogines Special parts Coo Ross Mlgr Pinto Joe end Maria see NFF5 Supplies Plotake Ron see Aerolite Model supplies 116 Model Aviation Pond John Old Time Plan Service P0600 3215 San Jose CA 85156 408 292-3382 Hundreds plans fur old-timer models description RM Enterprises Hutehinson Tom Rosemary 3255 NW Crocker In. Albany OR 87321 Kits Ultimate Orugmasrer A2 glider Maccrick 4A gas Zingo PAl Power Mfgr Race-Wings see Cloudhuster Venture Schmidt Custom Kits 11948 Franklin Blvd. Elk Grove CA 95824 916 685-3627 after 8 pm Short kits old-timers John Ponds list Y 0 props Redwood spruce strip Sckroedter George see Champion Model Products Shipton Dave end Mary Ann see Hobby Hideaway Simpson Gene see Kinco Sknjeec Gerald A. see Micro-X Products Sliff Bob see Hobby Horn Small Parts Inc. 6901 NE Third Ave. Miami FL 33138 Snerything imatinable small hardware Tubing screws mci mntric gears washers Superior Aircraft Materials Taibi Mike PO Boo 8082 Long Beach CA 80808 Balsa sizestrades quantltiec Die cuttingforkit manufacturers Mfgr SwenAl R Swenson Dick 7373 N Teatonia Apt 9 Milwaukee WI 53209 Alloy engine pan-mount PAl power Swenson Dick see SmenAIR TWA Engines see Performance Model Parts Inc Taibi Mike see Superior Aircraft Materials Teruien Fred see NFFS Plane end Publicatboos Thompeon Marty Karen see NFF5 Supplies Tobia Frank see Franks Hobbies Toner Edward J see Buzzer Model Airplane Co Tumer Ed 3544 Granada Dr. Fort Worth TX 76118 Czech-made Russian-type towline glider launching device Cur rently ocr stock VI prodacts 7871 Alebawa Ave #16 Canoga Park CA 91304 Electric propulsion flight ground support systems supplies kits Hytork 48 motor nicads Vista Labs see VI Products Waldner Arnold see K W Enterprises Wallock Gene see Hobby Horn Wrlliamn Bros. Inc 181 Pawnee St. San Maroon CA 92069 714 748-3082 Plastic acces scale models tngines mach guns wheels pilots props etc Mfgr V and 0 Props see Bills Mail Order Hobby Zaic C Co. Inc Jetco 883 Lexington Ave. Brooklyn NY 11221 Kitofor PP Sport Fpccmpetrtion classes Peanut EmbryoAt A2 HL gliders VaA Gas Gas Scale Mfgr Zaic Frank see Junior Aero Space Co Bob Meuser 4200 Gregory St Oakland CA 94619 Aipha/Palumbo Continued page 38 3 Using square project locations ribs up plan mark locations LE aileron spar Mark off centerline LE aileron spar rib location 4 Glue ribs between LE aileron spar centerline rib coincides centerlines LE aileron spar location Insure squareness ribs building surface using square 5 Cement 5/4 X oubler between Ri R2 6 Cement pruce spars notches ribs 7 Cement 1/16 balsa LE TE sheeting right-hand wing panel cut-outs R2 R3 R4 LG block facing down also sheet centersection Ri R4 before turning panel over 8 Turn panel over Reposition support blocks sheet LE TE 9 To make left-hand panel repeat steps 1 through 7 except now cut-outs R2 R3 R4 will face up sheet center section before turning left panel over Turn left panel over reposition support blocks sheet LE TE Sheet centersection 10 youve followed instructions correctiy up point should have right left wing panel top centersection sheeted bottom centersection sheeted Now epoxy 1/16 ply rib doublers R2 R4 11 Install LG blocks trunnion blocks 38in triangle either side 1/16 ply dowel support between spars between Ri R2 Trial fit 5/32 LG before sheeting undersides panel Note centersection sheeting over underside should extend out end LG block about nd R4 12 Cement Xl/16 cap strips R5 through Ri 1 Wing tip blocks carved hollowed cemented paneL 13 Bend torque rods ailerons using se piece 5/32 aluminum tubing bearing around torque rods ill fit very nicely standard piece K&S 5/32 tubing Notch trailing edge stock accept torque rods 14 Cement trailing edge torque rods inserted wing panels extremely careful point insure trailing edge positioned symmetrically about centerline airfoil section before glue hardens Use masking tape make sure position TE does change glue hardens 15 Trial fit ailerons wing panels Insert hinges aileron spars locate corresponding slots ailerons Drill notch inboard sections ailerons accept torque rods Make sure ailerons move easily before final installation 16 Before joining wing panels shape LE carefully sand dihedral angle center joint paneL Cement ignment blocks panels Apply epoxy joining surfaces cement panels together Cover centersection joint 4-in wide piece 6 oz fiberglass filled epoxy resin Tail Surface 1 Cut vertical horizontal stabilizers balsa sheet Taper elevator rudder shape fin stab leading edges form airfoil-like contour 2 Install pin hinges stationary portion make corresponding slots elevator rudder accept hinges 3 Cement -in pine insert rudder control horn shown plan flap control horn used join elevator halves no pine insert need used 3/32 MW used cement pine insert elevator halves control horn location desired 4 Install elevator joiner flap control horn elevator halves insure alignment two halves drill oversized hole joiner fill epoxy join flat surface covered wax paper 5 The elevator permanently hinged ward stab centerpiece epoxied place Coating joiner Vaseline prior epoxy ing centerpiece place will insure joiner epoxied stab Final AssembIy 1 Final shape rear top portion fuselage Cut -in slots horizontal stab shown plan Cement horizontal stab fuselage True align ment obtained laying fuselage its top over plan locating elevator hinge line over location shown plan fuselage top flat building surface place piece scrap 3/16 balsa under end stab pin everything down 2 The sub-fin cemented fuselage horizontal stab drying Shape rear lower fuselage prior gluing sub-fin place Insure squareness sub-fin building surface insure centered fuselage 3 The -in plywood wing hold-down now cemented fuselage sure epoxy -in triangular stock pieces junctions between fuselage sides former number 3 4 Locate centerline wing over centerline fuselage Insure precisely same height off building surface leading trailing edges will yield zero incidence Adjust fuselage cut-outs accordingly insure true alignment horizontal stab 5 Locate holes leading edge hard dowels Drill s way through 1/16 plywood dowel supports aft main spars Insert dowels epoxy place 6 With wing properly aligned drill number seven holes location nylon bolts Drill through -in hold-down plate Remove wing tap holes hold-down plate -20 tap open holes wing trail ing edge Replace wing bolt place using -20 nylon bolts Fairings FILL FUEL PUMP PUMPS IN0GENERATION AND OUT ONLY $4fl95DU-BRO FUEL HAND IVPUMPS- SONICALLY OPERA TEDSEALED TO PREVENT CAT NO 191-II BLACK PUMP-ULTRA SMALL AND FOR GLO-FUELSCOMPACT--UNIQUE CLIP-ON MOUNTING SYSTEM FITS ON GALLON QUART OR PINT CAT NO 250-IGH RED PUMP-VOLUME FOR GAS/OIL MIXTURESCOMPLETE FUELING SYSTEM INCLUDES CAP FITTINGS FUEL -TUBING AND FILTER I~jDUBRO PRODUCTS INCORPORATED 480 Banner Road Wauconda IIInois 60064 USA leading trailing edges built up sanded shape 7 Cement fin canopy blocks fuselage insuring properly centered Sand shape fuselage contours shown plans build up fillets desired using favorite gunk prefer Epoxolite 8 Apply favorite finish keep light possible 9 Install landing gear fuel tank engine pushrods Make sure nose wheel adjusted wing sits zero incidence level grounJ case Install radio achieve de sired CG location Locate CG fore desired position shown plans less sensitivity elevator deflection Full aerobatic capabilities exist CG positioned shown Finishing Use favorite method keep light possible used Solarfilm cover wing tail surfaces fuselage covered silk three coats clear dope two coats Formula-U Flying Alpha Alpha tracks like shes riding rails Flat-out air speed 70 mph landing airspeed mere 20 mph standard Enya 45 Tatone muffler needed Several props tried including Zinger 10-6 Top Flite 10-6 11-4 both Standard Super-M Tornado Nylon 10-6 Top Flite Nylon 10-6 Best performance obtained Standard Top Flite 10-6 noted several flights made using Enya 45 muffler noticeable increase performance evident upon switching Tatone muffler tuned pipe would probably increase effective power output bother since aircraft capable Masters pattern maneuvers pipe As aircraft sensitivity controls strong function CG location Fore aft limits shown plan having tested aircraft locations between limits position shown recommend Further aft plane too sensitive elevator deflection wind gusts forward leads sluggish response elevator spins resemble vertical diving rolls moderately flat spin achieved CG positioned shown full up elevator oppo site rudder aileron Recovery extremely quick smooth upon neutralizing controls Snap-rolls pose no problem Perhaps impressive stall turns have ever seen achieved Alpha Apply rudder fraction second before throttling back watch Alpha flatest turns youll ever observe Inverted flight characteristics knife-edge flight characteristics good no observable bad tendencies slight amount up elevator required knife-edge position keep plane tracking straight Build Alpha properly youre some very pleasant aerobatic flying fraction cost Pendulums/H aight Continued page 42 Jack has similar success Beechcraft since revamped pendulum system since aircraft flies much higher speed speaks well systems ability overcome effects centrifugal force has mentioned thought possible peril brought about installation pendulums horizontal mode Continued page 120 April1980 117
Edition: Model Aviation - 1980/04
Page Numbers: 36, 37, 38, 116, 117
Editors Note would remiss make special note excellent design Mi Palumbo deserves high praise execution specialized aircraft An aeronautical engineer able gild lily wing design really does improve stability perform ance skilledflier can realistically appraise creation hands others priar efforts have made direction magazines including so-called sport 40-powered aerobatic jobs Sunday fliers usually too often merely smaller standard pattern machines believe can recommend reservation appears right IN DESIGNING Alpha objective come up easy-to-build racy looking air plane having full aerobatic capabilities standard engine nonretractable trike gear primary motivation provide relatively inexpensive answer interested develop ing skills aerobatic fliers Note said aerobatic fliers necessarilypattenz fliers though Alpha will perform maneuvers required AMA Masters pattern believe lots fliers like myself have 36 Model Aviation sport flier difference size between 40/60 jobs great remains con scious comparison sport fliers enjoy aerobatics own sakewithout superexcessive power loadings switching gadgetry So designer opted fixed gear FULL SIZE PLANS AVAILABLE SEE PAGE 128 IVOO VA CE OHEeLESCe V4OVELHMSSWVT SECT1VA IVO 00 HOLLOWED WOVE I4O IT HUASMEST IRE CLV WOVO 4WAE EWORALASS RBHANSONVEOLO TWANALETRUMNOSVAPSTWP SRN4SO VEOVO VS V 00 ALEROS VHMOPV OuTLAW -I-z~~ -MJAL kVI E4HARO SleET 1~ IVHHARO SHEET VIVEOHAL OOEAVTSOSOMASIC WIRE [v32][b-1-10-1-10]] I OV 2 MO OPPSOT\\-SHESOEET SIXES RE C SI104OASO SHEET ALL SWS S/HESROEV SA WEO SLOVO- ALL PHOL USE HAT LEAOVVT LOR SHEETHOOLSE LYE PLOWOHO VOTSW, OTRIASHE OnE SHEET H OH HIA ROT-H HASHjfljflVP 3HOH 02 EOVSES SE SE UROTTVVHTLVEVSJIOVTL ESTIOHPLVVSEOOHO S 0~-5iTVEH -STEERAWFILLET HATLAW3OSOSSEET MOORLES ----~- 1-I SE 5 --EWO LMTT LIMIT-EHTSWWOLEHOHHHEE V104 PLYWOHO TVSWLOVH HOLLOAEO-LV2SHEETMAIN HOAR SVSAUVSIV WE AWEEESESH HVWTSIAAOLE 5SLOVEVV-HO SOLOS MOLTSV4TSIMWLE 055 WN WY DOWIC J PALUSMOO LENATO OW 5 --OR PLTWHOE 5 IC PLTWHOO ItS PLYHOVO ENHIHE WOAST SAL ION MAPLE neither time nor desire nor bankroll necessary become serious contenders pattern competition so-called sport fliers enjoy aerobatic flying its own sake its purest form super-excessive power loadings electronic switching gadgetry So Alpha dosigned look fast fly fast yield snappy per formance cost much less typical full-blown pattern aircraft Evolution Design Among factors enter design highly aero batic aircraft two stand out important namely drag weight aircraft unique compromise very important factors vertical maneuver capabilities aerobatic aircraft must pos sess make two factors increasingly important Enya 45 mounted long bearers strengthen nose way back L E. fits like hand ins glove Considering drag weight pararosount factors require unique compromise aircraft especially vital vertical maneuvershis clean configuration achieved weight 45 lbs. including radio April 1980 37 Seen beneath handling pushrod exits split elevators horns etc. self- evident cruciform fairing intersection hori zontal vertical surfaces often seen good aircraft Hence effort has made keep Alpha light possible maintaining sufficiently sound structural strength take high Gs imposed during maneuvering Drag has minimized presenting small frontal area practical oncoming flow stream lining contours wherever possible desire use fixed conventional tricycle gear primarily keep expense weight minimum extra effort required keep airframe drag down fuselage lines very similar Bridi UFO RCM Sept 77 graceful lines strikingly beautiful aircraft provided inspira tion Alphas lines side view dupli cated closely possible maintaining proper moments lateral area distribution insure balance ballast good knifeedge flight characteristics suppose should mention time hold Doctorate Aeronautics have designed scratch-built over 20 original RC aircraft past seven years professional experience field airfoil design put good use Alphas predecessors progressive airfoils used designing Alphas wing coupled particular wing planform chosen eliminates possibility tip stall provides lift distribution mini mizes loading root net advantage slender wing can built much lighter will see aerobatic aircraft size extra effort spent designing structure paid off overall weight Cirrus radio 45 pounds resulting comparatively low wing loading makes nice slow landings very smooth takeoffs fact could install retracts thats bag still have wing loading nice-and-easy category Flight characteristics will discussed later current list prices materials should cost about$3000 Hardware i e nosegear assembly LG wire control horns devises nyrod fuel tank will cost about $600 Editors Note Since article written prices may 10% 15% higher quoted Fuselage Cut 3/32 sides cement 3/32 doubler cross-grain nose aft Station 3 shown plans Cement 3/32 X eron aft ofStation3 stab LE position( Station 5 make cut-out fuselage sides time 2 Locate former stiffener locations sides Draw lines perpendicular straight fuselage top edge locations 3 Cement iangle stock fuselage sides shown plans Fit cement stiffeners sides Stations4 andS 4 Cut out formers trial fit fuselage sides appropriate locations Insure snug flush fit glue joints Cut out engine rails trial fit formers 1 and2 Drill holes Temporarily mount nose-gear bracket former 1 backdrill holes fuel lines through nylon bracket Remove nose-gear after doing 5 Locate centerline ofa3/16 X 3 sheet balsa Overlay fuselage top view trace outside profile former locations Trim aft ends triangle stock cemented fuselage sides aft fuselage sides will join properly taiL 6 Cut away excess 3/16 top sheet Epoxy formers 1 2 3 top down top sheet flat building surface Insure squareness top sheet centerline centerline position formers After epoxy has set epoxy engine rails formers 1 2 7 Apply liberal coat epoxy former sides sides engine rails Apply cement top triangle longerons Assemble fuselage sides top sheet pin necessary Apply cement inside surfaces trimmed triangle stock tail clamp place ensuring squareness fuse lage sides building surface Pull nose together against engine rails clamp 8 Coat inside fuel tank compartment epoxy after trial fitting recommended tank Also coat interior surfaces engine com partment epoxy 9 Trial fit pushrods Nyrods used cement cross bracing locations 3 4 5 Sheet lower fuselage aft Station 3 cross-grain 3/32 sheet 10 Install nose-gear bearing throttle steer ing pushrods Nyrod flex cable recommended Insure clearance steering arm trim needed clear fuselage sides 11 Locate centerline chin block Locate centerline block over center lines formers 1 2 Pull nose together ensuring 2 dimension across top sur face engine rails nose centered chin block Scribe outline nose chin block Trace side view chin block plans Trim excess balsa hollow chin block shown 12 Coat entire inside surface chin block epoxy Set aside dry Locate engine engine rails leaving rance between spinner forward face sides Drill holes engine through engine rails Install blind mounting nuts 13 Epoxy chin block fuselage Square off forward face respect flat building surface Epoxy 1/16 ply spinner ring fuselage 14 Coat a section top nose block inside surface epoxy cement fuselage 15 Carve nose fuselage shape Make cut outs necessary clear engine muffler installation Wing 1 Block up E over plan 4 positions using 1-in blocks 2 Block up ileron spar over plan four positions using 1-in blocks Continued page 116 38 Model Aviation Viewed several angles Alpha exhibits points interest whiclt final analysis answer great question Should build designer used progressive airfoils particular planform eliminate tip stalls providing lift distribution minimum loading root advantage being lighter slender wing aerobatic craft POWR-MITE DUAL SHAFT SANDER* Plus 2fl0 Shppr FACTORY DIRECT Thousands sold 3995 compact high quality bench model disc sander general hobby use Double ended motor shaft grinding wheel drum sander buffer can attached disturbing motor warranty rlC 110/120 volts AC U year limited FREE $500 CERTI FICATE UL approved motor U Fully adjustable tilt table limited time sander will contain coupon good Fully assembled bench tested $500 worth accessoriessand Large over 12 sqinches sanding area ing disc grinding wheel etc shown grindino wheel artuohed ting arbor rod sndng wheel no insloderl P0 Box 5 2294 Mimosa Lane POWRMITELake Havasu City AZ 96403 ENIIRPRISIS602855-31a5 NEW Ducted Fan RC Scale Plans in/spanlength price SR 71 reconnaissance 1 le2400r45engines5541077 $3250 F9F5 PantherDynajetor Fan3554g51450 F86D Sabre" 43471450 F8 Crusader" 38531450 u2 Spyplane 1035251450 F86L Sabreuc Dynajet only373751250 F4J PhantomRC 51450 Propeller Driven P38 LightningRC 2 4045 eng52381250 P39 AiracobreRC 2 4580 51441250 P40 MarhaukRC 24560 37531751250 P828 Twin MustangRC 2 2540 523651250 177 Cessna CardinalRC eo engine725551250 Plans Full Size Working Plans Prices subject $150 first-class postage pay check allow 10 days Send check money order RALPH SALDIVAR 1608 LANDES Ct MODESTO CA 95350 USA 44055 ZiS 2828354 Indoorsupplies balsa rubber microfilm misc Scale rubberpower kits Mfgr Moody C P Lucky see CPM Products Mooney Waft 2912 Cabrillo Mesa Dr. San Diego CA 92123 Plight-toted Peanut Scale piano three sets 14 set plus non-Peanut $5/oct ppd NFFS Plane Publications Teraian Fred 4858 Moorpark Ave. San Jose CA 95129 Plans galore NPFS Symposium reports NFFS Digest beck issues world champs plans book Misc NFF5 supplies IThomlsson Marty aod Karen 2012 Landos Ln. Sacramento CA 95826 916 451-1076 Misc Pf sopplies sorts Noonan Jim see Oldtimer Models OK Engines PO Boo 40 Mohawk NY 13407 Engines parts sew used OK other brands Ignition parts Oldtimer Models Jim Noonan POSes 18002 Milwaukee WI 5321a Misc plans kits supplies publications Oldtimer scale modern Robber balsa tissue Mfgr Cat SOc P & W Model Service see Hobby Horn Packard ET. see Cleveland Model fr Supply Co Peck Polymers Peck Bob Sandy PO Boo 2498 La Mesa CA 92041 714 459-8875 714 442-4838 Misc robberpower COa kits plans parts supplies Peanut Scale Brown engines rubber Mfgr Performance Model Parts Inc Dye Itlen R 1015 S 8th St. Minneapolis MN 55415 612 3393805 TWA cogines Special parts Coo Ross Mlgr Pinto Joe end Maria see NFF5 Supplies Plotake Ron see Aerolite Model supplies 116 Model Aviation Pond John Old Time Plan Service P0600 3215 San Jose CA 85156 408 292-3382 Hundreds plans fur old-timer models description RM Enterprises Hutehinson Tom Rosemary 3255 NW Crocker In. Albany OR 87321 Kits Ultimate Orugmasrer A2 glider Maccrick 4A gas Zingo PAl Power Mfgr Race-Wings see Cloudhuster Venture Schmidt Custom Kits 11948 Franklin Blvd. Elk Grove CA 95824 916 685-3627 after 8 pm Short kits old-timers John Ponds list Y 0 props Redwood spruce strip Sckroedter George see Champion Model Products Shipton Dave end Mary Ann see Hobby Hideaway Simpson Gene see Kinco Sknjeec Gerald A. see Micro-X Products Sliff Bob see Hobby Horn Small Parts Inc. 6901 NE Third Ave. Miami FL 33138 Snerything imatinable small hardware Tubing screws mci mntric gears washers Superior Aircraft Materials Taibi Mike PO Boo 8082 Long Beach CA 80808 Balsa sizestrades quantltiec Die cuttingforkit manufacturers Mfgr SwenAl R Swenson Dick 7373 N Teatonia Apt 9 Milwaukee WI 53209 Alloy engine pan-mount PAl power Swenson Dick see SmenAIR TWA Engines see Performance Model Parts Inc Taibi Mike see Superior Aircraft Materials Teruien Fred see NFFS Plane end Publicatboos Thompeon Marty Karen see NFF5 Supplies Tobia Frank see Franks Hobbies Toner Edward J see Buzzer Model Airplane Co Tumer Ed 3544 Granada Dr. Fort Worth TX 76118 Czech-made Russian-type towline glider launching device Cur rently ocr stock VI prodacts 7871 Alebawa Ave #16 Canoga Park CA 91304 Electric propulsion flight ground support systems supplies kits Hytork 48 motor nicads Vista Labs see VI Products Waldner Arnold see K W Enterprises Wallock Gene see Hobby Horn Wrlliamn Bros. Inc 181 Pawnee St. San Maroon CA 92069 714 748-3082 Plastic acces scale models tngines mach guns wheels pilots props etc Mfgr V and 0 Props see Bills Mail Order Hobby Zaic C Co. Inc Jetco 883 Lexington Ave. Brooklyn NY 11221 Kitofor PP Sport Fpccmpetrtion classes Peanut EmbryoAt A2 HL gliders VaA Gas Gas Scale Mfgr Zaic Frank see Junior Aero Space Co Bob Meuser 4200 Gregory St Oakland CA 94619 Aipha/Palumbo Continued page 38 3 Using square project locations ribs up plan mark locations LE aileron spar Mark off centerline LE aileron spar rib location 4 Glue ribs between LE aileron spar centerline rib coincides centerlines LE aileron spar location Insure squareness ribs building surface using square 5 Cement 5/4 X oubler between Ri R2 6 Cement pruce spars notches ribs 7 Cement 1/16 balsa LE TE sheeting right-hand wing panel cut-outs R2 R3 R4 LG block facing down also sheet centersection Ri R4 before turning panel over 8 Turn panel over Reposition support blocks sheet LE TE 9 To make left-hand panel repeat steps 1 through 7 except now cut-outs R2 R3 R4 will face up sheet center section before turning left panel over Turn left panel over reposition support blocks sheet LE TE Sheet centersection 10 youve followed instructions correctiy up point should have right left wing panel top centersection sheeted bottom centersection sheeted Now epoxy 1/16 ply rib doublers R2 R4 11 Install LG blocks trunnion blocks 38in triangle either side 1/16 ply dowel support between spars between Ri R2 Trial fit 5/32 LG before sheeting undersides panel Note centersection sheeting over underside should extend out end LG block about nd R4 12 Cement Xl/16 cap strips R5 through Ri 1 Wing tip blocks carved hollowed cemented paneL 13 Bend torque rods ailerons using se piece 5/32 aluminum tubing bearing around torque rods ill fit very nicely standard piece K&S 5/32 tubing Notch trailing edge stock accept torque rods 14 Cement trailing edge torque rods inserted wing panels extremely careful point insure trailing edge positioned symmetrically about centerline airfoil section before glue hardens Use masking tape make sure position TE does change glue hardens 15 Trial fit ailerons wing panels Insert hinges aileron spars locate corresponding slots ailerons Drill notch inboard sections ailerons accept torque rods Make sure ailerons move easily before final installation 16 Before joining wing panels shape LE carefully sand dihedral angle center joint paneL Cement ignment blocks panels Apply epoxy joining surfaces cement panels together Cover centersection joint 4-in wide piece 6 oz fiberglass filled epoxy resin Tail Surface 1 Cut vertical horizontal stabilizers balsa sheet Taper elevator rudder shape fin stab leading edges form airfoil-like contour 2 Install pin hinges stationary portion make corresponding slots elevator rudder accept hinges 3 Cement -in pine insert rudder control horn shown plan flap control horn used join elevator halves no pine insert need used 3/32 MW used cement pine insert elevator halves control horn location desired 4 Install elevator joiner flap control horn elevator halves insure alignment two halves drill oversized hole joiner fill epoxy join flat surface covered wax paper 5 The elevator permanently hinged ward stab centerpiece epoxied place Coating joiner Vaseline prior epoxy ing centerpiece place will insure joiner epoxied stab Final AssembIy 1 Final shape rear top portion fuselage Cut -in slots horizontal stab shown plan Cement horizontal stab fuselage True align ment obtained laying fuselage its top over plan locating elevator hinge line over location shown plan fuselage top flat building surface place piece scrap 3/16 balsa under end stab pin everything down 2 The sub-fin cemented fuselage horizontal stab drying Shape rear lower fuselage prior gluing sub-fin place Insure squareness sub-fin building surface insure centered fuselage 3 The -in plywood wing hold-down now cemented fuselage sure epoxy -in triangular stock pieces junctions between fuselage sides former number 3 4 Locate centerline wing over centerline fuselage Insure precisely same height off building surface leading trailing edges will yield zero incidence Adjust fuselage cut-outs accordingly insure true alignment horizontal stab 5 Locate holes leading edge hard dowels Drill s way through 1/16 plywood dowel supports aft main spars Insert dowels epoxy place 6 With wing properly aligned drill number seven holes location nylon bolts Drill through -in hold-down plate Remove wing tap holes hold-down plate -20 tap open holes wing trail ing edge Replace wing bolt place using -20 nylon bolts Fairings FILL FUEL PUMP PUMPS IN0GENERATION AND OUT ONLY $4fl95DU-BRO FUEL HAND IVPUMPS- SONICALLY OPERA TEDSEALED TO PREVENT CAT NO 191-II BLACK PUMP-ULTRA SMALL AND FOR GLO-FUELSCOMPACT--UNIQUE CLIP-ON MOUNTING SYSTEM FITS ON GALLON QUART OR PINT CAT NO 250-IGH RED PUMP-VOLUME FOR GAS/OIL MIXTURESCOMPLETE FUELING SYSTEM INCLUDES CAP FITTINGS FUEL -TUBING AND FILTER I~jDUBRO PRODUCTS INCORPORATED 480 Banner Road Wauconda IIInois 60064 USA leading trailing edges built up sanded shape 7 Cement fin canopy blocks fuselage insuring properly centered Sand shape fuselage contours shown plans build up fillets desired using favorite gunk prefer Epoxolite 8 Apply favorite finish keep light possible 9 Install landing gear fuel tank engine pushrods Make sure nose wheel adjusted wing sits zero incidence level grounJ case Install radio achieve de sired CG location Locate CG fore desired position shown plans less sensitivity elevator deflection Full aerobatic capabilities exist CG positioned shown Finishing Use favorite method keep light possible used Solarfilm cover wing tail surfaces fuselage covered silk three coats clear dope two coats Formula-U Flying Alpha Alpha tracks like shes riding rails Flat-out air speed 70 mph landing airspeed mere 20 mph standard Enya 45 Tatone muffler needed Several props tried including Zinger 10-6 Top Flite 10-6 11-4 both Standard Super-M Tornado Nylon 10-6 Top Flite Nylon 10-6 Best performance obtained Standard Top Flite 10-6 noted several flights made using Enya 45 muffler noticeable increase performance evident upon switching Tatone muffler tuned pipe would probably increase effective power output bother since aircraft capable Masters pattern maneuvers pipe As aircraft sensitivity controls strong function CG location Fore aft limits shown plan having tested aircraft locations between limits position shown recommend Further aft plane too sensitive elevator deflection wind gusts forward leads sluggish response elevator spins resemble vertical diving rolls moderately flat spin achieved CG positioned shown full up elevator oppo site rudder aileron Recovery extremely quick smooth upon neutralizing controls Snap-rolls pose no problem Perhaps impressive stall turns have ever seen achieved Alpha Apply rudder fraction second before throttling back watch Alpha flatest turns youll ever observe Inverted flight characteristics knife-edge flight characteristics good no observable bad tendencies slight amount up elevator required knife-edge position keep plane tracking straight Build Alpha properly youre some very pleasant aerobatic flying fraction cost Pendulums/H aight Continued page 42 Jack has similar success Beechcraft since revamped pendulum system since aircraft flies much higher speed speaks well systems ability overcome effects centrifugal force has mentioned thought possible peril brought about installation pendulums horizontal mode Continued page 120 April1980 117
Edition: Model Aviation - 1980/04
Page Numbers: 36, 37, 38, 116, 117
Editors Note would remiss make special note excellent design Mi Palumbo deserves high praise execution specialized aircraft An aeronautical engineer able gild lily wing design really does improve stability perform ance skilledflier can realistically appraise creation hands others priar efforts have made direction magazines including so-called sport 40-powered aerobatic jobs Sunday fliers usually too often merely smaller standard pattern machines believe can recommend reservation appears right IN DESIGNING Alpha objective come up easy-to-build racy looking air plane having full aerobatic capabilities standard engine nonretractable trike gear primary motivation provide relatively inexpensive answer interested develop ing skills aerobatic fliers Note said aerobatic fliers necessarilypattenz fliers though Alpha will perform maneuvers required AMA Masters pattern believe lots fliers like myself have 36 Model Aviation sport flier difference size between 40/60 jobs great remains con scious comparison sport fliers enjoy aerobatics own sakewithout superexcessive power loadings switching gadgetry So designer opted fixed gear FULL SIZE PLANS AVAILABLE SEE PAGE 128 IVOO VA CE OHEeLESCe V4OVELHMSSWVT SECT1VA IVO 00 HOLLOWED WOVE I4O IT HUASMEST IRE CLV WOVO 4WAE EWORALASS RBHANSONVEOLO TWANALETRUMNOSVAPSTWP SRN4SO VEOVO VS V 00 ALEROS VHMOPV OuTLAW -I-z~~ -MJAL kVI E4HARO SleET 1~ IVHHARO SHEET VIVEOHAL OOEAVTSOSOMASIC WIRE [v32][b-1-10-1-10]] I OV 2 MO OPPSOT\\-SHESOEET SIXES RE C SI104OASO SHEET ALL SWS S/HESROEV SA WEO SLOVO- ALL PHOL USE HAT LEAOVVT LOR SHEETHOOLSE LYE PLOWOHO VOTSW, OTRIASHE OnE SHEET H OH HIA ROT-H HASHjfljflVP 3HOH 02 EOVSES SE SE UROTTVVHTLVEVSJIOVTL ESTIOHPLVVSEOOHO S 0~-5iTVEH -STEERAWFILLET HATLAW3OSOSSEET MOORLES ----~- 1-I SE 5 --EWO LMTT LIMIT-EHTSWWOLEHOHHHEE V104 PLYWOHO TVSWLOVH HOLLOAEO-LV2SHEETMAIN HOAR SVSAUVSIV WE AWEEESESH HVWTSIAAOLE 5SLOVEVV-HO SOLOS MOLTSV4TSIMWLE 055 WN WY DOWIC J PALUSMOO LENATO OW 5 --OR PLTWHOE 5 IC PLTWHOO ItS PLYHOVO ENHIHE WOAST SAL ION MAPLE neither time nor desire nor bankroll necessary become serious contenders pattern competition so-called sport fliers enjoy aerobatic flying its own sake its purest form super-excessive power loadings electronic switching gadgetry So Alpha dosigned look fast fly fast yield snappy per formance cost much less typical full-blown pattern aircraft Evolution Design Among factors enter design highly aero batic aircraft two stand out important namely drag weight aircraft unique compromise very important factors vertical maneuver capabilities aerobatic aircraft must pos sess make two factors increasingly important Enya 45 mounted long bearers strengthen nose way back L E. fits like hand ins glove Considering drag weight pararosount factors require unique compromise aircraft especially vital vertical maneuvershis clean configuration achieved weight 45 lbs. including radio April 1980 37 Seen beneath handling pushrod exits split elevators horns etc. self- evident cruciform fairing intersection hori zontal vertical surfaces often seen good aircraft Hence effort has made keep Alpha light possible maintaining sufficiently sound structural strength take high Gs imposed during maneuvering Drag has minimized presenting small frontal area practical oncoming flow stream lining contours wherever possible desire use fixed conventional tricycle gear primarily keep expense weight minimum extra effort required keep airframe drag down fuselage lines very similar Bridi UFO RCM Sept 77 graceful lines strikingly beautiful aircraft provided inspira tion Alphas lines side view dupli cated closely possible maintaining proper moments lateral area distribution insure balance ballast good knifeedge flight characteristics suppose should mention time hold Doctorate Aeronautics have designed scratch-built over 20 original RC aircraft past seven years professional experience field airfoil design put good use Alphas predecessors progressive airfoils used designing Alphas wing coupled particular wing planform chosen eliminates possibility tip stall provides lift distribution mini mizes loading root net advantage slender wing can built much lighter will see aerobatic aircraft size extra effort spent designing structure paid off overall weight Cirrus radio 45 pounds resulting comparatively low wing loading makes nice slow landings very smooth takeoffs fact could install retracts thats bag still have wing loading nice-and-easy category Flight characteristics will discussed later current list prices materials should cost about$3000 Hardware i e nosegear assembly LG wire control horns devises nyrod fuel tank will cost about $600 Editors Note Since article written prices may 10% 15% higher quoted Fuselage Cut 3/32 sides cement 3/32 doubler cross-grain nose aft Station 3 shown plans Cement 3/32 X eron aft ofStation3 stab LE position( Station 5 make cut-out fuselage sides time 2 Locate former stiffener locations sides Draw lines perpendicular straight fuselage top edge locations 3 Cement iangle stock fuselage sides shown plans Fit cement stiffeners sides Stations4 andS 4 Cut out formers trial fit fuselage sides appropriate locations Insure snug flush fit glue joints Cut out engine rails trial fit formers 1 and2 Drill holes Temporarily mount nose-gear bracket former 1 backdrill holes fuel lines through nylon bracket Remove nose-gear after doing 5 Locate centerline ofa3/16 X 3 sheet balsa Overlay fuselage top view trace outside profile former locations Trim aft ends triangle stock cemented fuselage sides aft fuselage sides will join properly taiL 6 Cut away excess 3/16 top sheet Epoxy formers 1 2 3 top down top sheet flat building surface Insure squareness top sheet centerline centerline position formers After epoxy has set epoxy engine rails formers 1 2 7 Apply liberal coat epoxy former sides sides engine rails Apply cement top triangle longerons Assemble fuselage sides top sheet pin necessary Apply cement inside surfaces trimmed triangle stock tail clamp place ensuring squareness fuse lage sides building surface Pull nose together against engine rails clamp 8 Coat inside fuel tank compartment epoxy after trial fitting recommended tank Also coat interior surfaces engine com partment epoxy 9 Trial fit pushrods Nyrods used cement cross bracing locations 3 4 5 Sheet lower fuselage aft Station 3 cross-grain 3/32 sheet 10 Install nose-gear bearing throttle steer ing pushrods Nyrod flex cable recommended Insure clearance steering arm trim needed clear fuselage sides 11 Locate centerline chin block Locate centerline block over center lines formers 1 2 Pull nose together ensuring 2 dimension across top sur face engine rails nose centered chin block Scribe outline nose chin block Trace side view chin block plans Trim excess balsa hollow chin block shown 12 Coat entire inside surface chin block epoxy Set aside dry Locate engine engine rails leaving rance between spinner forward face sides Drill holes engine through engine rails Install blind mounting nuts 13 Epoxy chin block fuselage Square off forward face respect flat building surface Epoxy 1/16 ply spinner ring fuselage 14 Coat a section top nose block inside surface epoxy cement fuselage 15 Carve nose fuselage shape Make cut outs necessary clear engine muffler installation Wing 1 Block up E over plan 4 positions using 1-in blocks 2 Block up ileron spar over plan four positions using 1-in blocks Continued page 116 38 Model Aviation Viewed several angles Alpha exhibits points interest whiclt final analysis answer great question Should build designer used progressive airfoils particular planform eliminate tip stalls providing lift distribution minimum loading root advantage being lighter slender wing aerobatic craft POWR-MITE DUAL SHAFT SANDER* Plus 2fl0 Shppr FACTORY DIRECT Thousands sold 3995 compact high quality bench model disc sander general hobby use Double ended motor shaft grinding wheel drum sander buffer can attached disturbing motor warranty rlC 110/120 volts AC U year limited FREE $500 CERTI FICATE UL approved motor U Fully adjustable tilt table limited time sander will contain coupon good Fully assembled bench tested $500 worth accessoriessand Large over 12 sqinches sanding area ing disc grinding wheel etc shown grindino wheel artuohed ting arbor rod sndng wheel no insloderl P0 Box 5 2294 Mimosa Lane POWRMITELake Havasu City AZ 96403 ENIIRPRISIS602855-31a5 NEW Ducted Fan RC Scale Plans in/spanlength price SR 71 reconnaissance 1 le2400r45engines5541077 $3250 F9F5 PantherDynajetor Fan3554g51450 F86D Sabre" 43471450 F8 Crusader" 38531450 u2 Spyplane 1035251450 F86L Sabreuc Dynajet only373751250 F4J PhantomRC 51450 Propeller Driven P38 LightningRC 2 4045 eng52381250 P39 AiracobreRC 2 4580 51441250 P40 MarhaukRC 24560 37531751250 P828 Twin MustangRC 2 2540 523651250 177 Cessna CardinalRC eo engine725551250 Plans Full Size Working Plans Prices subject $150 first-class postage pay check allow 10 days Send check money order RALPH SALDIVAR 1608 LANDES Ct MODESTO CA 95350 USA 44055 ZiS 2828354 Indoorsupplies balsa rubber microfilm misc Scale rubberpower kits Mfgr Moody C P Lucky see CPM Products Mooney Waft 2912 Cabrillo Mesa Dr. San Diego CA 92123 Plight-toted Peanut Scale piano three sets 14 set plus non-Peanut $5/oct ppd NFFS Plane Publications Teraian Fred 4858 Moorpark Ave. San Jose CA 95129 Plans galore NPFS Symposium reports NFFS Digest beck issues world champs plans book Misc NFF5 supplies IThomlsson Marty aod Karen 2012 Landos Ln. Sacramento CA 95826 916 451-1076 Misc Pf sopplies sorts Noonan Jim see Oldtimer Models OK Engines PO Boo 40 Mohawk NY 13407 Engines parts sew used OK other brands Ignition parts Oldtimer Models Jim Noonan POSes 18002 Milwaukee WI 5321a Misc plans kits supplies publications Oldtimer scale modern Robber balsa tissue Mfgr Cat SOc P & W Model Service see Hobby Horn Packard ET. see Cleveland Model fr Supply Co Peck Polymers Peck Bob Sandy PO Boo 2498 La Mesa CA 92041 714 459-8875 714 442-4838 Misc robberpower COa kits plans parts supplies Peanut Scale Brown engines rubber Mfgr Performance Model Parts Inc Dye Itlen R 1015 S 8th St. Minneapolis MN 55415 612 3393805 TWA cogines Special parts Coo Ross Mlgr Pinto Joe end Maria see NFF5 Supplies Plotake Ron see Aerolite Model supplies 116 Model Aviation Pond John Old Time Plan Service P0600 3215 San Jose CA 85156 408 292-3382 Hundreds plans fur old-timer models description RM Enterprises Hutehinson Tom Rosemary 3255 NW Crocker In. Albany OR 87321 Kits Ultimate Orugmasrer A2 glider Maccrick 4A gas Zingo PAl Power Mfgr Race-Wings see Cloudhuster Venture Schmidt Custom Kits 11948 Franklin Blvd. Elk Grove CA 95824 916 685-3627 after 8 pm Short kits old-timers John Ponds list Y 0 props Redwood spruce strip Sckroedter George see Champion Model Products Shipton Dave end Mary Ann see Hobby Hideaway Simpson Gene see Kinco Sknjeec Gerald A. see Micro-X Products Sliff Bob see Hobby Horn Small Parts Inc. 6901 NE Third Ave. Miami FL 33138 Snerything imatinable small hardware Tubing screws mci mntric gears washers Superior Aircraft Materials Taibi Mike PO Boo 8082 Long Beach CA 80808 Balsa sizestrades quantltiec Die cuttingforkit manufacturers Mfgr SwenAl R Swenson Dick 7373 N Teatonia Apt 9 Milwaukee WI 53209 Alloy engine pan-mount PAl power Swenson Dick see SmenAIR TWA Engines see Performance Model Parts Inc Taibi Mike see Superior Aircraft Materials Teruien Fred see NFFS Plane end Publicatboos Thompeon Marty Karen see NFF5 Supplies Tobia Frank see Franks Hobbies Toner Edward J see Buzzer Model Airplane Co Tumer Ed 3544 Granada Dr. Fort Worth TX 76118 Czech-made Russian-type towline glider launching device Cur rently ocr stock VI prodacts 7871 Alebawa Ave #16 Canoga Park CA 91304 Electric propulsion flight ground support systems supplies kits Hytork 48 motor nicads Vista Labs see VI Products Waldner Arnold see K W Enterprises Wallock Gene see Hobby Horn Wrlliamn Bros. Inc 181 Pawnee St. San Maroon CA 92069 714 748-3082 Plastic acces scale models tngines mach guns wheels pilots props etc Mfgr V and 0 Props see Bills Mail Order Hobby Zaic C Co. Inc Jetco 883 Lexington Ave. Brooklyn NY 11221 Kitofor PP Sport Fpccmpetrtion classes Peanut EmbryoAt A2 HL gliders VaA Gas Gas Scale Mfgr Zaic Frank see Junior Aero Space Co Bob Meuser 4200 Gregory St Oakland CA 94619 Aipha/Palumbo Continued page 38 3 Using square project locations ribs up plan mark locations LE aileron spar Mark off centerline LE aileron spar rib location 4 Glue ribs between LE aileron spar centerline rib coincides centerlines LE aileron spar location Insure squareness ribs building surface using square 5 Cement 5/4 X oubler between Ri R2 6 Cement pruce spars notches ribs 7 Cement 1/16 balsa LE TE sheeting right-hand wing panel cut-outs R2 R3 R4 LG block facing down also sheet centersection Ri R4 before turning panel over 8 Turn panel over Reposition support blocks sheet LE TE 9 To make left-hand panel repeat steps 1 through 7 except now cut-outs R2 R3 R4 will face up sheet center section before turning left panel over Turn left panel over reposition support blocks sheet LE TE Sheet centersection 10 youve followed instructions correctiy up point should have right left wing panel top centersection sheeted bottom centersection sheeted Now epoxy 1/16 ply rib doublers R2 R4 11 Install LG blocks trunnion blocks 38in triangle either side 1/16 ply dowel support between spars between Ri R2 Trial fit 5/32 LG before sheeting undersides panel Note centersection sheeting over underside should extend out end LG block about nd R4 12 Cement Xl/16 cap strips R5 through Ri 1 Wing tip blocks carved hollowed cemented paneL 13 Bend torque rods ailerons using se piece 5/32 aluminum tubing bearing around torque rods ill fit very nicely standard piece K&S 5/32 tubing Notch trailing edge stock accept torque rods 14 Cement trailing edge torque rods inserted wing panels extremely careful point insure trailing edge positioned symmetrically about centerline airfoil section before glue hardens Use masking tape make sure position TE does change glue hardens 15 Trial fit ailerons wing panels Insert hinges aileron spars locate corresponding slots ailerons Drill notch inboard sections ailerons accept torque rods Make sure ailerons move easily before final installation 16 Before joining wing panels shape LE carefully sand dihedral angle center joint paneL Cement ignment blocks panels Apply epoxy joining surfaces cement panels together Cover centersection joint 4-in wide piece 6 oz fiberglass filled epoxy resin Tail Surface 1 Cut vertical horizontal stabilizers balsa sheet Taper elevator rudder shape fin stab leading edges form airfoil-like contour 2 Install pin hinges stationary portion make corresponding slots elevator rudder accept hinges 3 Cement -in pine insert rudder control horn shown plan flap control horn used join elevator halves no pine insert need used 3/32 MW used cement pine insert elevator halves control horn location desired 4 Install elevator joiner flap control horn elevator halves insure alignment two halves drill oversized hole joiner fill epoxy join flat surface covered wax paper 5 The elevator permanently hinged ward stab centerpiece epoxied place Coating joiner Vaseline prior epoxy ing centerpiece place will insure joiner epoxied stab Final AssembIy 1 Final shape rear top portion fuselage Cut -in slots horizontal stab shown plan Cement horizontal stab fuselage True align ment obtained laying fuselage its top over plan locating elevator hinge line over location shown plan fuselage top flat building surface place piece scrap 3/16 balsa under end stab pin everything down 2 The sub-fin cemented fuselage horizontal stab drying Shape rear lower fuselage prior gluing sub-fin place Insure squareness sub-fin building surface insure centered fuselage 3 The -in plywood wing hold-down now cemented fuselage sure epoxy -in triangular stock pieces junctions between fuselage sides former number 3 4 Locate centerline wing over centerline fuselage Insure precisely same height off building surface leading trailing edges will yield zero incidence Adjust fuselage cut-outs accordingly insure true alignment horizontal stab 5 Locate holes leading edge hard dowels Drill s way through 1/16 plywood dowel supports aft main spars Insert dowels epoxy place 6 With wing properly aligned drill number seven holes location nylon bolts Drill through -in hold-down plate Remove wing tap holes hold-down plate -20 tap open holes wing trail ing edge Replace wing bolt place using -20 nylon bolts Fairings FILL FUEL PUMP PUMPS IN0GENERATION AND OUT ONLY $4fl95DU-BRO FUEL HAND IVPUMPS- SONICALLY OPERA TEDSEALED TO PREVENT CAT NO 191-II BLACK PUMP-ULTRA SMALL AND FOR GLO-FUELSCOMPACT--UNIQUE CLIP-ON MOUNTING SYSTEM FITS ON GALLON QUART OR PINT CAT NO 250-IGH RED PUMP-VOLUME FOR GAS/OIL MIXTURESCOMPLETE FUELING SYSTEM INCLUDES CAP FITTINGS FUEL -TUBING AND FILTER I~jDUBRO PRODUCTS INCORPORATED 480 Banner Road Wauconda IIInois 60064 USA leading trailing edges built up sanded shape 7 Cement fin canopy blocks fuselage insuring properly centered Sand shape fuselage contours shown plans build up fillets desired using favorite gunk prefer Epoxolite 8 Apply favorite finish keep light possible 9 Install landing gear fuel tank engine pushrods Make sure nose wheel adjusted wing sits zero incidence level grounJ case Install radio achieve de sired CG location Locate CG fore desired position shown plans less sensitivity elevator deflection Full aerobatic capabilities exist CG positioned shown Finishing Use favorite method keep light possible used Solarfilm cover wing tail surfaces fuselage covered silk three coats clear dope two coats Formula-U Flying Alpha Alpha tracks like shes riding rails Flat-out air speed 70 mph landing airspeed mere 20 mph standard Enya 45 Tatone muffler needed Several props tried including Zinger 10-6 Top Flite 10-6 11-4 both Standard Super-M Tornado Nylon 10-6 Top Flite Nylon 10-6 Best performance obtained Standard Top Flite 10-6 noted several flights made using Enya 45 muffler noticeable increase performance evident upon switching Tatone muffler tuned pipe would probably increase effective power output bother since aircraft capable Masters pattern maneuvers pipe As aircraft sensitivity controls strong function CG location Fore aft limits shown plan having tested aircraft locations between limits position shown recommend Further aft plane too sensitive elevator deflection wind gusts forward leads sluggish response elevator spins resemble vertical diving rolls moderately flat spin achieved CG positioned shown full up elevator oppo site rudder aileron Recovery extremely quick smooth upon neutralizing controls Snap-rolls pose no problem Perhaps impressive stall turns have ever seen achieved Alpha Apply rudder fraction second before throttling back watch Alpha flatest turns youll ever observe Inverted flight characteristics knife-edge flight characteristics good no observable bad tendencies slight amount up elevator required knife-edge position keep plane tracking straight Build Alpha properly youre some very pleasant aerobatic flying fraction cost Pendulums/H aight Continued page 42 Jack has similar success Beechcraft since revamped pendulum system since aircraft flies much higher speed speaks well systems ability overcome effects centrifugal force has mentioned thought possible peril brought about installation pendulums horizontal mode Continued page 120 April1980 117
Edition: Model Aviation - 1980/04
Page Numbers: 36, 37, 38, 116, 117
Editors Note would remiss make special note excellent design Mi Palumbo deserves high praise execution specialized aircraft An aeronautical engineer able gild lily wing design really does improve stability perform ance skilledflier can realistically appraise creation hands others priar efforts have made direction magazines including so-called sport 40-powered aerobatic jobs Sunday fliers usually too often merely smaller standard pattern machines believe can recommend reservation appears right IN DESIGNING Alpha objective come up easy-to-build racy looking air plane having full aerobatic capabilities standard engine nonretractable trike gear primary motivation provide relatively inexpensive answer interested develop ing skills aerobatic fliers Note said aerobatic fliers necessarilypattenz fliers though Alpha will perform maneuvers required AMA Masters pattern believe lots fliers like myself have 36 Model Aviation sport flier difference size between 40/60 jobs great remains con scious comparison sport fliers enjoy aerobatics own sakewithout superexcessive power loadings switching gadgetry So designer opted fixed gear FULL SIZE PLANS AVAILABLE SEE PAGE 128 IVOO VA CE OHEeLESCe V4OVELHMSSWVT SECT1VA IVO 00 HOLLOWED WOVE I4O IT HUASMEST IRE CLV WOVO 4WAE EWORALASS RBHANSONVEOLO TWANALETRUMNOSVAPSTWP SRN4SO VEOVO VS V 00 ALEROS VHMOPV OuTLAW -I-z~~ -MJAL kVI E4HARO SleET 1~ IVHHARO SHEET VIVEOHAL OOEAVTSOSOMASIC WIRE [v32][b-1-10-1-10]] I OV 2 MO OPPSOT\\-SHESOEET SIXES RE C SI104OASO SHEET ALL SWS S/HESROEV SA WEO SLOVO- ALL PHOL USE HAT LEAOVVT LOR SHEETHOOLSE LYE PLOWOHO VOTSW, OTRIASHE OnE SHEET H OH HIA ROT-H HASHjfljflVP 3HOH 02 EOVSES SE SE UROTTVVHTLVEVSJIOVTL ESTIOHPLVVSEOOHO S 0~-5iTVEH -STEERAWFILLET HATLAW3OSOSSEET MOORLES ----~- 1-I SE 5 --EWO LMTT LIMIT-EHTSWWOLEHOHHHEE V104 PLYWOHO TVSWLOVH HOLLOAEO-LV2SHEETMAIN HOAR SVSAUVSIV WE AWEEESESH HVWTSIAAOLE 5SLOVEVV-HO SOLOS MOLTSV4TSIMWLE 055 WN WY DOWIC J PALUSMOO LENATO OW 5 --OR PLTWHOE 5 IC PLTWHOO ItS PLYHOVO ENHIHE WOAST SAL ION MAPLE neither time nor desire nor bankroll necessary become serious contenders pattern competition so-called sport fliers enjoy aerobatic flying its own sake its purest form super-excessive power loadings electronic switching gadgetry So Alpha dosigned look fast fly fast yield snappy per formance cost much less typical full-blown pattern aircraft Evolution Design Among factors enter design highly aero batic aircraft two stand out important namely drag weight aircraft unique compromise very important factors vertical maneuver capabilities aerobatic aircraft must pos sess make two factors increasingly important Enya 45 mounted long bearers strengthen nose way back L E. fits like hand ins glove Considering drag weight pararosount factors require unique compromise aircraft especially vital vertical maneuvershis clean configuration achieved weight 45 lbs. including radio April 1980 37 Seen beneath handling pushrod exits split elevators horns etc. self- evident cruciform fairing intersection hori zontal vertical surfaces often seen good aircraft Hence effort has made keep Alpha light possible maintaining sufficiently sound structural strength take high Gs imposed during maneuvering Drag has minimized presenting small frontal area practical oncoming flow stream lining contours wherever possible desire use fixed conventional tricycle gear primarily keep expense weight minimum extra effort required keep airframe drag down fuselage lines very similar Bridi UFO RCM Sept 77 graceful lines strikingly beautiful aircraft provided inspira tion Alphas lines side view dupli cated closely possible maintaining proper moments lateral area distribution insure balance ballast good knifeedge flight characteristics suppose should mention time hold Doctorate Aeronautics have designed scratch-built over 20 original RC aircraft past seven years professional experience field airfoil design put good use Alphas predecessors progressive airfoils used designing Alphas wing coupled particular wing planform chosen eliminates possibility tip stall provides lift distribution mini mizes loading root net advantage slender wing can built much lighter will see aerobatic aircraft size extra effort spent designing structure paid off overall weight Cirrus radio 45 pounds resulting comparatively low wing loading makes nice slow landings very smooth takeoffs fact could install retracts thats bag still have wing loading nice-and-easy category Flight characteristics will discussed later current list prices materials should cost about$3000 Hardware i e nosegear assembly LG wire control horns devises nyrod fuel tank will cost about $600 Editors Note Since article written prices may 10% 15% higher quoted Fuselage Cut 3/32 sides cement 3/32 doubler cross-grain nose aft Station 3 shown plans Cement 3/32 X eron aft ofStation3 stab LE position( Station 5 make cut-out fuselage sides time 2 Locate former stiffener locations sides Draw lines perpendicular straight fuselage top edge locations 3 Cement iangle stock fuselage sides shown plans Fit cement stiffeners sides Stations4 andS 4 Cut out formers trial fit fuselage sides appropriate locations Insure snug flush fit glue joints Cut out engine rails trial fit formers 1 and2 Drill holes Temporarily mount nose-gear bracket former 1 backdrill holes fuel lines through nylon bracket Remove nose-gear after doing 5 Locate centerline ofa3/16 X 3 sheet balsa Overlay fuselage top view trace outside profile former locations Trim aft ends triangle stock cemented fuselage sides aft fuselage sides will join properly taiL 6 Cut away excess 3/16 top sheet Epoxy formers 1 2 3 top down top sheet flat building surface Insure squareness top sheet centerline centerline position formers After epoxy has set epoxy engine rails formers 1 2 7 Apply liberal coat epoxy former sides sides engine rails Apply cement top triangle longerons Assemble fuselage sides top sheet pin necessary Apply cement inside surfaces trimmed triangle stock tail clamp place ensuring squareness fuse lage sides building surface Pull nose together against engine rails clamp 8 Coat inside fuel tank compartment epoxy after trial fitting recommended tank Also coat interior surfaces engine com partment epoxy 9 Trial fit pushrods Nyrods used cement cross bracing locations 3 4 5 Sheet lower fuselage aft Station 3 cross-grain 3/32 sheet 10 Install nose-gear bearing throttle steer ing pushrods Nyrod flex cable recommended Insure clearance steering arm trim needed clear fuselage sides 11 Locate centerline chin block Locate centerline block over center lines formers 1 2 Pull nose together ensuring 2 dimension across top sur face engine rails nose centered chin block Scribe outline nose chin block Trace side view chin block plans Trim excess balsa hollow chin block shown 12 Coat entire inside surface chin block epoxy Set aside dry Locate engine engine rails leaving rance between spinner forward face sides Drill holes engine through engine rails Install blind mounting nuts 13 Epoxy chin block fuselage Square off forward face respect flat building surface Epoxy 1/16 ply spinner ring fuselage 14 Coat a section top nose block inside surface epoxy cement fuselage 15 Carve nose fuselage shape Make cut outs necessary clear engine muffler installation Wing 1 Block up E over plan 4 positions using 1-in blocks 2 Block up ileron spar over plan four positions using 1-in blocks Continued page 116 38 Model Aviation Viewed several angles Alpha exhibits points interest whiclt final analysis answer great question Should build designer used progressive airfoils particular planform eliminate tip stalls providing lift distribution minimum loading root advantage being lighter slender wing aerobatic craft POWR-MITE DUAL SHAFT SANDER* Plus 2fl0 Shppr FACTORY DIRECT Thousands sold 3995 compact high quality bench model disc sander general hobby use Double ended motor shaft grinding wheel drum sander buffer can attached disturbing motor warranty rlC 110/120 volts AC U year limited FREE $500 CERTI FICATE UL approved motor U Fully adjustable tilt table limited time sander will contain coupon good Fully assembled bench tested $500 worth accessoriessand Large over 12 sqinches sanding area ing disc grinding wheel etc shown grindino wheel artuohed ting arbor rod sndng wheel no insloderl P0 Box 5 2294 Mimosa Lane POWRMITELake Havasu City AZ 96403 ENIIRPRISIS602855-31a5 NEW Ducted Fan RC Scale Plans in/spanlength price SR 71 reconnaissance 1 le2400r45engines5541077 $3250 F9F5 PantherDynajetor Fan3554g51450 F86D Sabre" 43471450 F8 Crusader" 38531450 u2 Spyplane 1035251450 F86L Sabreuc Dynajet only373751250 F4J PhantomRC 51450 Propeller Driven P38 LightningRC 2 4045 eng52381250 P39 AiracobreRC 2 4580 51441250 P40 MarhaukRC 24560 37531751250 P828 Twin MustangRC 2 2540 523651250 177 Cessna CardinalRC eo engine725551250 Plans Full Size Working Plans Prices subject $150 first-class postage pay check allow 10 days Send check money order RALPH SALDIVAR 1608 LANDES Ct MODESTO CA 95350 USA 44055 ZiS 2828354 Indoorsupplies balsa rubber microfilm misc Scale rubberpower kits Mfgr Moody C P Lucky see CPM Products Mooney Waft 2912 Cabrillo Mesa Dr. San Diego CA 92123 Plight-toted Peanut Scale piano three sets 14 set plus non-Peanut $5/oct ppd NFFS Plane Publications Teraian Fred 4858 Moorpark Ave. San Jose CA 95129 Plans galore NPFS Symposium reports NFFS Digest beck issues world champs plans book Misc NFF5 supplies IThomlsson Marty aod Karen 2012 Landos Ln. Sacramento CA 95826 916 451-1076 Misc Pf sopplies sorts Noonan Jim see Oldtimer Models OK Engines PO Boo 40 Mohawk NY 13407 Engines parts sew used OK other brands Ignition parts Oldtimer Models Jim Noonan POSes 18002 Milwaukee WI 5321a Misc plans kits supplies publications Oldtimer scale modern Robber balsa tissue Mfgr Cat SOc P & W Model Service see Hobby Horn Packard ET. see Cleveland Model fr Supply Co Peck Polymers Peck Bob Sandy PO Boo 2498 La Mesa CA 92041 714 459-8875 714 442-4838 Misc robberpower COa kits plans parts supplies Peanut Scale Brown engines rubber Mfgr Performance Model Parts Inc Dye Itlen R 1015 S 8th St. Minneapolis MN 55415 612 3393805 TWA cogines Special parts Coo Ross Mlgr Pinto Joe end Maria see NFF5 Supplies Plotake Ron see Aerolite Model supplies 116 Model Aviation Pond John Old Time Plan Service P0600 3215 San Jose CA 85156 408 292-3382 Hundreds plans fur old-timer models description RM Enterprises Hutehinson Tom Rosemary 3255 NW Crocker In. Albany OR 87321 Kits Ultimate Orugmasrer A2 glider Maccrick 4A gas Zingo PAl Power Mfgr Race-Wings see Cloudhuster Venture Schmidt Custom Kits 11948 Franklin Blvd. Elk Grove CA 95824 916 685-3627 after 8 pm Short kits old-timers John Ponds list Y 0 props Redwood spruce strip Sckroedter George see Champion Model Products Shipton Dave end Mary Ann see Hobby Hideaway Simpson Gene see Kinco Sknjeec Gerald A. see Micro-X Products Sliff Bob see Hobby Horn Small Parts Inc. 6901 NE Third Ave. Miami FL 33138 Snerything imatinable small hardware Tubing screws mci mntric gears washers Superior Aircraft Materials Taibi Mike PO Boo 8082 Long Beach CA 80808 Balsa sizestrades quantltiec Die cuttingforkit manufacturers Mfgr SwenAl R Swenson Dick 7373 N Teatonia Apt 9 Milwaukee WI 53209 Alloy engine pan-mount PAl power Swenson Dick see SmenAIR TWA Engines see Performance Model Parts Inc Taibi Mike see Superior Aircraft Materials Teruien Fred see NFFS Plane end Publicatboos Thompeon Marty Karen see NFF5 Supplies Tobia Frank see Franks Hobbies Toner Edward J see Buzzer Model Airplane Co Tumer Ed 3544 Granada Dr. Fort Worth TX 76118 Czech-made Russian-type towline glider launching device Cur rently ocr stock VI prodacts 7871 Alebawa Ave #16 Canoga Park CA 91304 Electric propulsion flight ground support systems supplies kits Hytork 48 motor nicads Vista Labs see VI Products Waldner Arnold see K W Enterprises Wallock Gene see Hobby Horn Wrlliamn Bros. Inc 181 Pawnee St. San Maroon CA 92069 714 748-3082 Plastic acces scale models tngines mach guns wheels pilots props etc Mfgr V and 0 Props see Bills Mail Order Hobby Zaic C Co. Inc Jetco 883 Lexington Ave. Brooklyn NY 11221 Kitofor PP Sport Fpccmpetrtion classes Peanut EmbryoAt A2 HL gliders VaA Gas Gas Scale Mfgr Zaic Frank see Junior Aero Space Co Bob Meuser 4200 Gregory St Oakland CA 94619 Aipha/Palumbo Continued page 38 3 Using square project locations ribs up plan mark locations LE aileron spar Mark off centerline LE aileron spar rib location 4 Glue ribs between LE aileron spar centerline rib coincides centerlines LE aileron spar location Insure squareness ribs building surface using square 5 Cement 5/4 X oubler between Ri R2 6 Cement pruce spars notches ribs 7 Cement 1/16 balsa LE TE sheeting right-hand wing panel cut-outs R2 R3 R4 LG block facing down also sheet centersection Ri R4 before turning panel over 8 Turn panel over Reposition support blocks sheet LE TE 9 To make left-hand panel repeat steps 1 through 7 except now cut-outs R2 R3 R4 will face up sheet center section before turning left panel over Turn left panel over reposition support blocks sheet LE TE Sheet centersection 10 youve followed instructions correctiy up point should have right left wing panel top centersection sheeted bottom centersection sheeted Now epoxy 1/16 ply rib doublers R2 R4 11 Install LG blocks trunnion blocks 38in triangle either side 1/16 ply dowel support between spars between Ri R2 Trial fit 5/32 LG before sheeting undersides panel Note centersection sheeting over underside should extend out end LG block about nd R4 12 Cement Xl/16 cap strips R5 through Ri 1 Wing tip blocks carved hollowed cemented paneL 13 Bend torque rods ailerons using se piece 5/32 aluminum tubing bearing around torque rods ill fit very nicely standard piece K&S 5/32 tubing Notch trailing edge stock accept torque rods 14 Cement trailing edge torque rods inserted wing panels extremely careful point insure trailing edge positioned symmetrically about centerline airfoil section before glue hardens Use masking tape make sure position TE does change glue hardens 15 Trial fit ailerons wing panels Insert hinges aileron spars locate corresponding slots ailerons Drill notch inboard sections ailerons accept torque rods Make sure ailerons move easily before final installation 16 Before joining wing panels shape LE carefully sand dihedral angle center joint paneL Cement ignment blocks panels Apply epoxy joining surfaces cement panels together Cover centersection joint 4-in wide piece 6 oz fiberglass filled epoxy resin Tail Surface 1 Cut vertical horizontal stabilizers balsa sheet Taper elevator rudder shape fin stab leading edges form airfoil-like contour 2 Install pin hinges stationary portion make corresponding slots elevator rudder accept hinges 3 Cement -in pine insert rudder control horn shown plan flap control horn used join elevator halves no pine insert need used 3/32 MW used cement pine insert elevator halves control horn location desired 4 Install elevator joiner flap control horn elevator halves insure alignment two halves drill oversized hole joiner fill epoxy join flat surface covered wax paper 5 The elevator permanently hinged ward stab centerpiece epoxied place Coating joiner Vaseline prior epoxy ing centerpiece place will insure joiner epoxied stab Final AssembIy 1 Final shape rear top portion fuselage Cut -in slots horizontal stab shown plan Cement horizontal stab fuselage True align ment obtained laying fuselage its top over plan locating elevator hinge line over location shown plan fuselage top flat building surface place piece scrap 3/16 balsa under end stab pin everything down 2 The sub-fin cemented fuselage horizontal stab drying Shape rear lower fuselage prior gluing sub-fin place Insure squareness sub-fin building surface insure centered fuselage 3 The -in plywood wing hold-down now cemented fuselage sure epoxy -in triangular stock pieces junctions between fuselage sides former number 3 4 Locate centerline wing over centerline fuselage Insure precisely same height off building surface leading trailing edges will yield zero incidence Adjust fuselage cut-outs accordingly insure true alignment horizontal stab 5 Locate holes leading edge hard dowels Drill s way through 1/16 plywood dowel supports aft main spars Insert dowels epoxy place 6 With wing properly aligned drill number seven holes location nylon bolts Drill through -in hold-down plate Remove wing tap holes hold-down plate -20 tap open holes wing trail ing edge Replace wing bolt place using -20 nylon bolts Fairings FILL FUEL PUMP PUMPS IN0GENERATION AND OUT ONLY $4fl95DU-BRO FUEL HAND IVPUMPS- SONICALLY OPERA TEDSEALED TO PREVENT CAT NO 191-II BLACK PUMP-ULTRA SMALL AND FOR GLO-FUELSCOMPACT--UNIQUE CLIP-ON MOUNTING SYSTEM FITS ON GALLON QUART OR PINT CAT NO 250-IGH RED PUMP-VOLUME FOR GAS/OIL MIXTURESCOMPLETE FUELING SYSTEM INCLUDES CAP FITTINGS FUEL -TUBING AND FILTER I~jDUBRO PRODUCTS INCORPORATED 480 Banner Road Wauconda IIInois 60064 USA leading trailing edges built up sanded shape 7 Cement fin canopy blocks fuselage insuring properly centered Sand shape fuselage contours shown plans build up fillets desired using favorite gunk prefer Epoxolite 8 Apply favorite finish keep light possible 9 Install landing gear fuel tank engine pushrods Make sure nose wheel adjusted wing sits zero incidence level grounJ case Install radio achieve de sired CG location Locate CG fore desired position shown plans less sensitivity elevator deflection Full aerobatic capabilities exist CG positioned shown Finishing Use favorite method keep light possible used Solarfilm cover wing tail surfaces fuselage covered silk three coats clear dope two coats Formula-U Flying Alpha Alpha tracks like shes riding rails Flat-out air speed 70 mph landing airspeed mere 20 mph standard Enya 45 Tatone muffler needed Several props tried including Zinger 10-6 Top Flite 10-6 11-4 both Standard Super-M Tornado Nylon 10-6 Top Flite Nylon 10-6 Best performance obtained Standard Top Flite 10-6 noted several flights made using Enya 45 muffler noticeable increase performance evident upon switching Tatone muffler tuned pipe would probably increase effective power output bother since aircraft capable Masters pattern maneuvers pipe As aircraft sensitivity controls strong function CG location Fore aft limits shown plan having tested aircraft locations between limits position shown recommend Further aft plane too sensitive elevator deflection wind gusts forward leads sluggish response elevator spins resemble vertical diving rolls moderately flat spin achieved CG positioned shown full up elevator oppo site rudder aileron Recovery extremely quick smooth upon neutralizing controls Snap-rolls pose no problem Perhaps impressive stall turns have ever seen achieved Alpha Apply rudder fraction second before throttling back watch Alpha flatest turns youll ever observe Inverted flight characteristics knife-edge flight characteristics good no observable bad tendencies slight amount up elevator required knife-edge position keep plane tracking straight Build Alpha properly youre some very pleasant aerobatic flying fraction cost Pendulums/H aight Continued page 42 Jack has similar success Beechcraft since revamped pendulum system since aircraft flies much higher speed speaks well systems ability overcome effects centrifugal force has mentioned thought possible peril brought about installation pendulums horizontal mode Continued page 120 April1980 117