I Above Using geodesics lightness coupled torsional strength Jumpin Geo puts whole new perspective compe tition fun-flying makes challenge again As fliers learn use performance capabilities design Its siblings will open new chapter sport RC Aerobatics Below K&B 45 engine spinning Rev-Up 11 x 4 prop produces over three pounds static thrust giving Geo full vertical capability Maneuvers incredibly close-In tight Put good 45 glow engine 3-lb RCer start blowing away competition fun-fly events EJohn Hunton U Bill Winter TO EXCEL fun-fly events model must able maneuver quickly tightly about axes means must weigh very little have low wing loading Jumpin Geo excels fun-flying points new direction RC airplanes designed such events Overall performance maneuverability incredibleunlike anything ever seen RC model Maneuvers remarkably close-in tightloops rolls take about secondand turns unbelievably quick plane has full vertical capability achieve desired lightness sacrificing strength used geodesics torsional rigidity flying surfaces fuselage eliminates need usual D-tube sheet leading edge Also since front wing nonstructural can cut out fuel tank Taking advantage lack emphasis high velocities fun-fly events designed economical structure considerable thickness flying surfaces interdependent spaceframe like members produce extremely light structure still allows full range speed flight Because lightness coupled elevator aileron/flaps model can also flown remarkably slowly Jumpin Geo weighs close three pounds built care uses 40 45 engine K&B sport 45 swinging Rev-Up 11 x 4 propeller produces well over three pounds static thrust giving spectacular vertical performance Take off point airplane up will reach sky Construction Since very lightweight models require simplified structures theyre relatively fast easy build can save few ounces using optional rolled sheet leading edges flying surfaces substitute relatively soft x -in rounded balsa youre using rolled sheet its good idea begin preforming surfaces November 1991 13 Vertical performance impressive model takes off couple feet has known sprint unexpectedly air during taxiing models can take straight up rolling author highly competitive Tun tiler traces its design roots such CL novations HA Thomass coupled flap/elevator concept Stunt models introduced 1947 Huntons may geodesic fun-fly RC will hold together full bore Left rolied tube ol son Vie sneet Daisa used leading edges movable surfaces fin stabilizer ne sneets wetted formed successively around -in %-ln dowels wing leading edge also 1A sheet molded broomstick single step Sections made wrapping wetted sheet around form elastic bandage Right wing ribs can stack sawn full-length ribs installed bias interrupted ribs other Start center work toward tip Special construction features Build wing leading edge fairing soaking two-inch wide strip /16 medium-soft balsa strip rolling around broomstick Soak strip hot water least hour tape end side broomstick Wrap balsa around broomstick Ace bandage Allow assembly thoroughly dry leaving warm place overnight Remove bandage have nicely formed leading edge fairing Use 36-in-long hardwood dowels 3A-in two %-in diameter leading edges other flying surfaces Soak 1-in strip soft /16 balsa wrap around 3A-in dowel allow assembly dry overnight Remove balsa soak again wrap around pair %-in dowels glued together Roll another strip 3A-in dowel repeat two-step procedure balsa cracks use softer strips next time Make enough leading edge material entire model plus reserve Lone Star Models 1623 57th St Lubbock TX 79412 excellent balsa supplier following order will provide almost everything need 26 sheets A6 x 3-in selected soft 6-9 lb/cu ft selecting costs additional 15% two sheets /8 x 4-in selected soft four sheets /16 x 4-in unselected 12 sheets sq eight 4 x also unselected Youre provided surplus select Youll also need some A-in-thick plywood firewall other thicknesses aileron/flap servo mechanism wing skid shear plates Go through balsa own selecting Holding sheet up bare light bulb allows its characteristics come shining through Save wood straightest clearest grain rolling leading edges use rest ribs Wing Building geodesic wing looks lot challenging Its interesting task really difficult jigsaw band saw available stack saw ribs cut few extra ribs parts youll have hand easy repairs Battle damage tends limited structure lightweight Cut wing ribs half Begin building either top bottom wing half flat board pin full-length ribs direction fill partial ribs other direction 14 Model Aviation wing spars constant cross section variable density accommodate differing structural loads Firm wood used center section wIth soft wood tip xx INzK w t wing half built flat board over plan installing ribs cen ter outward prevents compounding errors wing center section spar webbing Bias balsa filler installed center bay help distribute flight loads between top bottom spars Left Note sculptural quality completed wing half second half can built directly stop first pinning latter down spar bracing up trailing edge Right aileron/flaps elevator rudder identical cross section use same ribs diagonals diagonal bracing greatly improves torsional stiffness Ultralight rolled balsa leading edges can used NO OCR TEXT Full-Size Plans Available. Page 196 I/B H I/H FIRM BALSW. DIAGONAL RIB HORNR ERR HGEUNE- ~INRO06 SREE I/AG 3/B H1 RD BALSAI/lB H I/Z~ I/lB H 3/B HORARTS HINGE POINTS______ 1/16 0 I/O TRIM RIB FOR I/lB SHEET TOP AND BOTTOMI IN ROLLED 1/16 IN SHEET SLOT FOR FIN POST I/HO DETAIL / / / AV SEE STABILIZER ELEVATORFOf II II1/40 3/B HARD BALSA POST IIORNOPP II BS 1 IADO BOUNDAN BOB N PO I-BE ORE N ALLN 1iACOT OUT WING EL TANK I r FOR BOOBBASA BHR H SGNOERONS FIBEWALL TEMPBALANCE POINT TORE COLAR-1 I/B IN WIREOPTIONAL SSF~ iOPTIONALLONG NOSEMINI -SEHVI FORBATTERY/RECEIVERBIBS BALSA I/lW WIRESPIDER MOUNTTRROT IN BOTTOMBOO 3/30 BALSA 50 PP OR TBASSWOODBROD GUIDERIBS 1kB FIN 6000 STAB ELEUAILEBOBS FOR KWH 45 SPOBYSTERI I II 47/A RNB 0006I--I- TEMP RD ELEWOR B 0 SHEE J UMPIN G EO DESIGNED AND GRAWI JOHN HONTON199 would lead cumulative errors Instead start center work toward tip errors begin creep just make sure keep ribs absolutely parallel plan position eventually theyll work out Except otherwise noted use medium-density balsa Since variations will occur balsa put advantage using harder ribs middle softer ones toward tips Use CyA cyanoacrylate glue assembly except another adhesive specified wing spars laminated different densities balsa hard wood middle lighter density tips wood should selected carefully Join spar pairs Install spar trailing edge surface sheet rib assembly remove building board Youll note assembly already has high torsional strength Strength bending however poor Pin down completed wing half spar brace up trailing edge build second half over first Install remaiaing ribs second spar trailing edge piece Reinforce center bay wing spar layer bias-grained balsa bias balsasheets /I6 balsa glued together grain opposite 45 B angles material very light yet provides good diagonal stiffness rigidity Add diagonal spar bracing Add trailing edge vertical sheet rolled leading edge Shave necessary ribs add center section sheet Build up tips Fit A6 skid shear plates under wings Cover sheets spar area lightweight fiberglass CyA Drill install %2-ID brass tubes Coat tubes rib intersection baking soda CyA Block sand wing using large sanding block Take care overdo sanding ribs between joints Check reglue open joints Add about oz weight left tip counteract offset weight engine cylinder muffler may have adjust amount later Build remaining flying surfaces Pin down leading edge add true ribs trailing edge Fit diagonals assembly flat bench diagonal members cut same basic shape 16 Model Aviation CI CUT TO ViA VI CLEAR LI \TAHW2J NO BIAS BALSA PRE- FORMED WITH TWO LAYERS I/lB BALSA WITH GRAIN 45 OPPOSITE DIRECTICNS\, stabilizer elevator under construc tion stab fin built up -inthick ribs root sections reinforced firm solid balsa stub spars fuselage sides made bias balsa sheets 1A balsa glued together grain opposite 450 angles Half weight Lite Ply good strength sheets preassembled slow-setting cyanoacrylate installed fuse lage frame trimmed Full-Size Plans Available Page 196 WA ~--flMA A4 BAII ORII II GRAM INITIAL CONTROL TRROWS RODDER Z5 ELECATOR DO AILERON 20 FLAP ADDS 15 W RE SPACE CONTROLS SEROD INSTALLATION LAPAORDER ____ W AXJX FRAME I/B LITEPLO ERS-/S LITEPLY AD C KEEPERS I/S LITEPLO SHUTTLE 3/SD AIRCRAFT PLF AADRORT MOONTRA S55 SRDRT MOONS 6-3D SCREWS NOTCH WIRE5/32 IE RRASS TORE LIGHTENIND ROLESCREW I/A PLYWOODSOLDER LAD WIRE WRAPSILOER SOLDER I/S M W3/3D M LITEWEIGHT WREEL SHORT MDANT -LSNS NDSE FIRED WREEL OPTION WIND SKID DETAIL FORMED LE DETAIL FOR TAIL AILERONS MATER LINE IJUMPIN GEo DE SIDNED AND DRAWN JOHN RANTDN1991 complicating factor otherwise straightforward wing construction sanding aileron/flap tips Build tips flat bench Sand top surfaces proper thickness bring surfaces alignment rest structure bottom surfaces tips will sweep upward giving appearance being warped Place flat area top apparentiy warped area bottom addition producing tapered tips irregularity creates certain amount washout upright wing improves stall characteristics stabilizer rudder built -in-deep ribs diagonals Fuselage Builders options either fuselage long nose short mount short fuselage spider mount spider mount permits installation simple lightweight steerable nose wheel See Flying section viewpoint opinions Begin fuselage construction building up bias-grained sheets A6 stock ouflined wing construction section using slow-cure thick CyA Select hard straight-grained wood longerons Soak four longerons hot water Pin down over plans add uprights note temporary verticals Allow assembly dry overnight remove hom board Add top bottom crosspieces Install firewall 6-32 blind nuts place engine mounting Cover fuselage bias-grained sheeting front A-in sheeting toward rear Round fuselage corners carving sanding Cut openings wing-fuselage joint As final step before assembly add baking soda fillets fortified CyA inside nose area Landing gear system Jumpin Geo uses combination nose wheel wing skids Although saves weight makes very poor taxiing characteristics low speed Taxi grass extreme care nose wheel/wing skid system does give excellent performance high ground speeds means can plant model having stall landing touchdown great touch-andgoes over line skids literally grab grass can keep power steer confidence pull up go again will could add wheels skids small weight penalty Tailor Geo way youll flying competition Covering Cover surfaces using lightest material practical used transparent MonoKote prototype since seems lighter solid-colored variety first prototype covered single color November 1991 17 fuselage sides built directly atop other sake accuracy Use waxed pa per over plan betwen sides prevent unwanted adhesion photographic purposes easy quick orientation however its good idea put large identifying color swatches top bottom cover top bottom different colors second prototype covered Micafilm lighter weight MonoKote Cut covering material mating surfaces assemble parts Use baking soda fillets CyA such critical areas wing stab installations Since wing removable hinge ailerons until wing installation has completed Complete hinging installation epoxy install control horns Final assembly Install round four-ounce fuel tank front fuselage/wing area Cut disc plastic top margarine container cover fuel tank hole firewall Drill disc engine mount holes fuel lines Seal plastic firewall silicone sealant Install radio control gear directly through top fuselage linkages will exposed routed interior fuselage Note directions optional coupled aileron/flap elevator Stack receiver battery wrap thin foam Measure assembly size RC box Build box 3/ balsa cut opening fuselage top sheeting just behind wing spar 18 Model Aviation fuselage side frames ready covered bias-grained balsa Bias balsa provides good diagonal stIffness rIgIdIty adding little weight Full-Size Plans Available Page 196 NOTE- DIAGONAL RIBS ARE SPLIT ON TB S INE DIAGONAL RIBS 6 REOUBEG I/IS BALSA I/B H /6 FIRN BALSA BR -IL 1/16 SHEOT TOP N BOTTOM THIS AREA L FOB FOEL TANS 0 AGONA RIB \KN RIB CAT CENTER TWO BIBS TO FIT BETWEEN DIAGONALSIS BEOGIBED I/IS BALSA I/A 3/B BALSAHINGE UNE ST-IN 1/16 BALSAWINOT P DE AlL CORER W/GAGSOH 3/32 DASS TGBE TBOE SELECTED HARDHARDRI B I/A SO SPARS~SGFT -A--- SOFT N ROLLED I/IS ISGFT FILL JUMPIN GEO DESGNEG AND DRAWN JOAN HANTON 1991 Cut openings rudder elevator servos top RC box choose optional coupled flaperon/elevator function youll also need cut hole aileron servo coupled aileron/flaps-elevator aileron servo slides shuttle actuated elevator servo ailerons move opposition elevator increased lift elevator moves up elevator servo pulls aileron servo aft droop flaps elevator moves down flaps raised Use 14-in -sq members mount servos positioning across fuselage under top sheeting Predrill holes servo screws prepare holes CyA Build up aileron servo shuttle track install fuselage Cut opening throttle servo Install servos have super transmitter may want use spoiler function servo wing rather coupled aileron/flaps-elevator function single servo Install front wheel side skids engine K&B Spider mount offers simple lightweight steerable nose wheel option point provided youve thinking light model should weigh ready go slightly over three pounds K&B 45 engine spinning 11 x 4 Rev-Up propeller recommended power setup Carefully check center-of-gravity Later balance point can incrementally moved rearward desired control response Begin slowly using recommended control throws build up gradually much control motion can handle Hying As mentioned model will fly successfully either fixed steerable nose wheel use spider-type mount does prototype steerable nose wheel can added little additional weight fixed nose wheel Jumpin Geo can steered using elevator keep nose light using prop blast over rudder make turn Its important practice repeatedly before taxiing out around people planes taxi too fast model will take off prematurely Any model design has built-in structural limitations Jumpin Geo dont use full control stick deflections flying fast want turn tight slow down first loops turns actually tighter start relatively slowly Use Continued page 93 November 1991 19 MATCH OTHER SHE 1/6 author bolts K&B 45 engine K&B spider mount permits installation lightweight steerable nose wheel Exposed BC gear gasp Gec sacrifices frills lightness aileron servo mounted shuttle actuated elevator servo coupled aileron/flapselevator function say about product call Ernst Ni-Cap protective cover fits brands Ni Cd glow plug igniters thousands other modelers have time another dropped glow plug igniters dirt have watched roll off table have put pockets have short out against keys some other metal object short out pocket few years ago after started Pylon Racer pitched air About five laps race felt something burning leg lucky enough get out before burned able finish race Ni-Cap does three things 1 prevents shorting 2 eliminates rolling glow plug igniter syndrome 3 keeps plug end clean foreign objects Ni-Cap orange plastic cap molded tether has loop end slips over shank glow plug igniter tether prevents losing cap also serves prevent glow plug igniter rolling off top field box landing dirt have word caution igniter use cap tether sticking out right angles shank igniter make sure facing away prop Should want buy Ni-Cap contact Ernst Manufacturing Inc 37396 Ruben Lane Sandy OR 97055 phone 503 668-5597 usually end up column wishing safe month now believe safe month dont feed body parts through rotating prop D Jumpin Geo/Hunton Continued page 19 four-pitch propeller keep airspeed down vertical capability up Models turn tightly produce considerable G-forces high speeds youll need exercise good sense Fun-fly model design entering golden age Most innovative aircraft use 0S 32 engine Jumpin Geo weve climbed 45 power yet still kept within three-pound wall Geo flies slowly unbelievably tightly also penetrates winds macho style airplane bridges gap between ubiquitous traditional Ugly Stick types delicate new-generation modelsthe sort usually employ least some high-tech materials purposely marginal design As fliers learn use capabilities Jumpin Geo its siblings will opening new chapter sport RC Aerobatics information about specialized fun-fly models have look Jerry Smiths built-up design December 1990 RC Report see Dan Stevenss hollowed-foam wing design February 1991 issue same magazine articles also provide good reference options building Jumpin Geo model really something else fly Its responsiveness will amaze its first contest FARM fun fly near Warrenton Virginia Jumpin Geo placed first time takeoff climb 15 seconds spot landing first Fast-Slow first takeoff number loops 30 seconds Geo unlikely excel AFTER YOU DID ALL THE WORK WHY LET YOUR AIRPLANE DO ALL THE FLYING INFO $500 AWARDED Grand Champion Reserve Grand Champion Ultralight 1989 Sun-N-Fun Fly-In BUILD & FLY THE miniMAX YOURSELF o Computer Designedr3 Axis Control o Part 103 Ultralight Easy Construction Wood Construction TEAM INC BOX 338M BRADY VILLE TN 37026 615 765-5397 November 1991 93 Spend less time buildin& mare tn Sheets available ONLY iu Thre ailable 1/16 x 12 x 35 Stock #6650 3/32x 12x 35- Stock #6651 1/8 x 12 x 35 Stock #6652 PMID PRODULru iIC 4shma Htff44tl994Z-1134 a199tMltPdUt5COlftC1 #5-91-153 Electric F ight Llghtweiglt 12 00money bark Adjustable switching point Soldertess terminal ror easy bookap $2 gna ee ON/OFF Controller995 Mare Powe sa ewe gh 20 Size 22xt3x63 el1trenry anty 006V loss Add S1 ohippio3 Clifoois araidonls add 725% 12 17 Tao Send Check money order Comes sith//High Sky Fntabaoranartrr3929 Kansas St #9 other Cosrectors orer.2. flA 92104 olso availableSan uuun beauty contest otherwise its probably unmatched Jumpin Geo puts whole new perspective RC flying makes fun-flying challenge again Build yourselfand enjoy0 Show Begin/Iden Continued page 25 Circlemaster AST Sussex Wisconsin Safety number have show teams performing before hundreds thousands people safety primary Sometimes lessons learned away show practice field pretty 4-scale Sig Cub shown photos belonged note past tense yours truly Cub yet fly air show offing little yellow OS 40 four-cyclepowered ship favorites made some 30 flights cartwheeled several times nasty crosswinds before two successful takeoffs during slow roll wings suddenly snapped right center model streamed straight hard drought-baked ground two wing panels fluttered earth drove home safety lesson Check aircraft thoroughly after seemingly minor toss-around checked wings various other important parts after cartwheels appeared order Struts secure points landing gear unscathed tail section solid no flex wings etc taken time remove wings cabin however examined center section would have found fractureprobably very smallin front center section cabin stress wires attach front wing fuselage Thats structural failure apparently occurred Its Satisfaction Guaranteedi EAYHINI 5H-710 Pkg 24 $2 95 THE HIGH-TECH HINGE DESIGNED FOR THE CYANOACRYLATE AGE Easier install other hinge No gouging picking messy epoxies Simply cut single knife slot hinge slide hinges place apply few drops favorite CA glue youre done SUPER FAST SUPER EASY SUPER STRONG 7de ee4 fo e4a MFG CO INC.401-7 So Front St.Montezuma IA 50171 623-5154 PRODUCTS FOR THE DISCERNING MODELER Complete Line Exhaust Systems * Tuned Pipes Muffled Tuned Pipes * Headers * Venturi Mufflers * Expansion Mufflers copter Ball Mufflers ialized Exhaust Systems Unsurpassel W,ki,n Drfomanc 94 Model Aviation TAKE THE HOBBY SHOP HOME WITH YOUM THE 15th ANNUAL RADIO CONTROL BUYERS GUIDE ts reference gutde oIl R/C hobbies Browse through guide find items need ond youll know just whot ask favorite hobby shop RADIO CONTROL BUYERS GUIDE lets turn wish list o shopping list knowing whats ovoilable con plan new projects improve existing projects Price informotion olso helps add up just whot plons will cost Look RADIO CONTROL BUYERS GUIDE local hobby shop call 800 533-6644 order ccc... eeceoccc ceoceec c eeecec eec Jo order send Dept X0419 RADIO CONTROL BUYERS GUIDE PO Box 1612 WaukeshaWI 53187-1612 YES Id like order _____ RADIO CONTROL BUYERS GUIDES #13002 $ ______ J Payment enclosed J Charge account Please print Name_________________________________________________ Street______________________________________________________[v33][b22911249163110790]] City State Zip__________________________________________________ Country_____________________________________________________[v33][b24421331183111470]] Charge Li Mastercard Li Visa Li American Express mm $15 Card#_________________________ Exp Date_____________ Signature Include tar postage handling US 3300 canadian tareign add 18% minimum $400 Wisconsin residents add 5% sales tas canadian araers add 7% GST ta tatal Price availability sublect ta change Payable US tunds Dept X0479
Edition: Model Aviation - 1991/11
Page Numbers: 12, 13, 14, 15, 16, 17, 18, 19, 93, 94
I Above Using geodesics lightness coupled torsional strength Jumpin Geo puts whole new perspective compe tition fun-flying makes challenge again As fliers learn use performance capabilities design Its siblings will open new chapter sport RC Aerobatics Below K&B 45 engine spinning Rev-Up 11 x 4 prop produces over three pounds static thrust giving Geo full vertical capability Maneuvers incredibly close-In tight Put good 45 glow engine 3-lb RCer start blowing away competition fun-fly events EJohn Hunton U Bill Winter TO EXCEL fun-fly events model must able maneuver quickly tightly about axes means must weigh very little have low wing loading Jumpin Geo excels fun-flying points new direction RC airplanes designed such events Overall performance maneuverability incredibleunlike anything ever seen RC model Maneuvers remarkably close-in tightloops rolls take about secondand turns unbelievably quick plane has full vertical capability achieve desired lightness sacrificing strength used geodesics torsional rigidity flying surfaces fuselage eliminates need usual D-tube sheet leading edge Also since front wing nonstructural can cut out fuel tank Taking advantage lack emphasis high velocities fun-fly events designed economical structure considerable thickness flying surfaces interdependent spaceframe like members produce extremely light structure still allows full range speed flight Because lightness coupled elevator aileron/flaps model can also flown remarkably slowly Jumpin Geo weighs close three pounds built care uses 40 45 engine K&B sport 45 swinging Rev-Up 11 x 4 propeller produces well over three pounds static thrust giving spectacular vertical performance Take off point airplane up will reach sky Construction Since very lightweight models require simplified structures theyre relatively fast easy build can save few ounces using optional rolled sheet leading edges flying surfaces substitute relatively soft x -in rounded balsa youre using rolled sheet its good idea begin preforming surfaces November 1991 13 Vertical performance impressive model takes off couple feet has known sprint unexpectedly air during taxiing models can take straight up rolling author highly competitive Tun tiler traces its design roots such CL novations HA Thomass coupled flap/elevator concept Stunt models introduced 1947 Huntons may geodesic fun-fly RC will hold together full bore Left rolied tube ol son Vie sneet Daisa used leading edges movable surfaces fin stabilizer ne sneets wetted formed successively around -in %-ln dowels wing leading edge also 1A sheet molded broomstick single step Sections made wrapping wetted sheet around form elastic bandage Right wing ribs can stack sawn full-length ribs installed bias interrupted ribs other Start center work toward tip Special construction features Build wing leading edge fairing soaking two-inch wide strip /16 medium-soft balsa strip rolling around broomstick Soak strip hot water least hour tape end side broomstick Wrap balsa around broomstick Ace bandage Allow assembly thoroughly dry leaving warm place overnight Remove bandage have nicely formed leading edge fairing Use 36-in-long hardwood dowels 3A-in two %-in diameter leading edges other flying surfaces Soak 1-in strip soft /16 balsa wrap around 3A-in dowel allow assembly dry overnight Remove balsa soak again wrap around pair %-in dowels glued together Roll another strip 3A-in dowel repeat two-step procedure balsa cracks use softer strips next time Make enough leading edge material entire model plus reserve Lone Star Models 1623 57th St Lubbock TX 79412 excellent balsa supplier following order will provide almost everything need 26 sheets A6 x 3-in selected soft 6-9 lb/cu ft selecting costs additional 15% two sheets /8 x 4-in selected soft four sheets /16 x 4-in unselected 12 sheets sq eight 4 x also unselected Youre provided surplus select Youll also need some A-in-thick plywood firewall other thicknesses aileron/flap servo mechanism wing skid shear plates Go through balsa own selecting Holding sheet up bare light bulb allows its characteristics come shining through Save wood straightest clearest grain rolling leading edges use rest ribs Wing Building geodesic wing looks lot challenging Its interesting task really difficult jigsaw band saw available stack saw ribs cut few extra ribs parts youll have hand easy repairs Battle damage tends limited structure lightweight Cut wing ribs half Begin building either top bottom wing half flat board pin full-length ribs direction fill partial ribs other direction 14 Model Aviation wing spars constant cross section variable density accommodate differing structural loads Firm wood used center section wIth soft wood tip xx INzK w t wing half built flat board over plan installing ribs cen ter outward prevents compounding errors wing center section spar webbing Bias balsa filler installed center bay help distribute flight loads between top bottom spars Left Note sculptural quality completed wing half second half can built directly stop first pinning latter down spar bracing up trailing edge Right aileron/flaps elevator rudder identical cross section use same ribs diagonals diagonal bracing greatly improves torsional stiffness Ultralight rolled balsa leading edges can used NO OCR TEXT Full-Size Plans Available. Page 196 I/B H I/H FIRM BALSW. DIAGONAL RIB HORNR ERR HGEUNE- ~INRO06 SREE I/AG 3/B H1 RD BALSAI/lB H I/Z~ I/lB H 3/B HORARTS HINGE POINTS______ 1/16 0 I/O TRIM RIB FOR I/lB SHEET TOP AND BOTTOMI IN ROLLED 1/16 IN SHEET SLOT FOR FIN POST I/HO DETAIL / / / AV SEE STABILIZER ELEVATORFOf II II1/40 3/B HARD BALSA POST IIORNOPP II BS 1 IADO BOUNDAN BOB N PO I-BE ORE N ALLN 1iACOT OUT WING EL TANK I r FOR BOOBBASA BHR H SGNOERONS FIBEWALL TEMPBALANCE POINT TORE COLAR-1 I/B IN WIREOPTIONAL SSF~ iOPTIONALLONG NOSEMINI -SEHVI FORBATTERY/RECEIVERBIBS BALSA I/lW WIRESPIDER MOUNTTRROT IN BOTTOMBOO 3/30 BALSA 50 PP OR TBASSWOODBROD GUIDERIBS 1kB FIN 6000 STAB ELEUAILEBOBS FOR KWH 45 SPOBYSTERI I II 47/A RNB 0006I--I- TEMP RD ELEWOR B 0 SHEE J UMPIN G EO DESIGNED AND GRAWI JOHN HONTON199 would lead cumulative errors Instead start center work toward tip errors begin creep just make sure keep ribs absolutely parallel plan position eventually theyll work out Except otherwise noted use medium-density balsa Since variations will occur balsa put advantage using harder ribs middle softer ones toward tips Use CyA cyanoacrylate glue assembly except another adhesive specified wing spars laminated different densities balsa hard wood middle lighter density tips wood should selected carefully Join spar pairs Install spar trailing edge surface sheet rib assembly remove building board Youll note assembly already has high torsional strength Strength bending however poor Pin down completed wing half spar brace up trailing edge build second half over first Install remaiaing ribs second spar trailing edge piece Reinforce center bay wing spar layer bias-grained balsa bias balsasheets /I6 balsa glued together grain opposite 45 B angles material very light yet provides good diagonal stiffness rigidity Add diagonal spar bracing Add trailing edge vertical sheet rolled leading edge Shave necessary ribs add center section sheet Build up tips Fit A6 skid shear plates under wings Cover sheets spar area lightweight fiberglass CyA Drill install %2-ID brass tubes Coat tubes rib intersection baking soda CyA Block sand wing using large sanding block Take care overdo sanding ribs between joints Check reglue open joints Add about oz weight left tip counteract offset weight engine cylinder muffler may have adjust amount later Build remaining flying surfaces Pin down leading edge add true ribs trailing edge Fit diagonals assembly flat bench diagonal members cut same basic shape 16 Model Aviation CI CUT TO ViA VI CLEAR LI \TAHW2J NO BIAS BALSA PRE- FORMED WITH TWO LAYERS I/lB BALSA WITH GRAIN 45 OPPOSITE DIRECTICNS\, stabilizer elevator under construc tion stab fin built up -inthick ribs root sections reinforced firm solid balsa stub spars fuselage sides made bias balsa sheets 1A balsa glued together grain opposite 450 angles Half weight Lite Ply good strength sheets preassembled slow-setting cyanoacrylate installed fuse lage frame trimmed Full-Size Plans Available Page 196 WA ~--flMA A4 BAII ORII II GRAM INITIAL CONTROL TRROWS RODDER Z5 ELECATOR DO AILERON 20 FLAP ADDS 15 W RE SPACE CONTROLS SEROD INSTALLATION LAPAORDER ____ W AXJX FRAME I/B LITEPLO ERS-/S LITEPLY AD C KEEPERS I/S LITEPLO SHUTTLE 3/SD AIRCRAFT PLF AADRORT MOONTRA S55 SRDRT MOONS 6-3D SCREWS NOTCH WIRE5/32 IE RRASS TORE LIGHTENIND ROLESCREW I/A PLYWOODSOLDER LAD WIRE WRAPSILOER SOLDER I/S M W3/3D M LITEWEIGHT WREEL SHORT MDANT -LSNS NDSE FIRED WREEL OPTION WIND SKID DETAIL FORMED LE DETAIL FOR TAIL AILERONS MATER LINE IJUMPIN GEo DE SIDNED AND DRAWN JOHN RANTDN1991 complicating factor otherwise straightforward wing construction sanding aileron/flap tips Build tips flat bench Sand top surfaces proper thickness bring surfaces alignment rest structure bottom surfaces tips will sweep upward giving appearance being warped Place flat area top apparentiy warped area bottom addition producing tapered tips irregularity creates certain amount washout upright wing improves stall characteristics stabilizer rudder built -in-deep ribs diagonals Fuselage Builders options either fuselage long nose short mount short fuselage spider mount spider mount permits installation simple lightweight steerable nose wheel See Flying section viewpoint opinions Begin fuselage construction building up bias-grained sheets A6 stock ouflined wing construction section using slow-cure thick CyA Select hard straight-grained wood longerons Soak four longerons hot water Pin down over plans add uprights note temporary verticals Allow assembly dry overnight remove hom board Add top bottom crosspieces Install firewall 6-32 blind nuts place engine mounting Cover fuselage bias-grained sheeting front A-in sheeting toward rear Round fuselage corners carving sanding Cut openings wing-fuselage joint As final step before assembly add baking soda fillets fortified CyA inside nose area Landing gear system Jumpin Geo uses combination nose wheel wing skids Although saves weight makes very poor taxiing characteristics low speed Taxi grass extreme care nose wheel/wing skid system does give excellent performance high ground speeds means can plant model having stall landing touchdown great touch-andgoes over line skids literally grab grass can keep power steer confidence pull up go again will could add wheels skids small weight penalty Tailor Geo way youll flying competition Covering Cover surfaces using lightest material practical used transparent MonoKote prototype since seems lighter solid-colored variety first prototype covered single color November 1991 17 fuselage sides built directly atop other sake accuracy Use waxed pa per over plan betwen sides prevent unwanted adhesion photographic purposes easy quick orientation however its good idea put large identifying color swatches top bottom cover top bottom different colors second prototype covered Micafilm lighter weight MonoKote Cut covering material mating surfaces assemble parts Use baking soda fillets CyA such critical areas wing stab installations Since wing removable hinge ailerons until wing installation has completed Complete hinging installation epoxy install control horns Final assembly Install round four-ounce fuel tank front fuselage/wing area Cut disc plastic top margarine container cover fuel tank hole firewall Drill disc engine mount holes fuel lines Seal plastic firewall silicone sealant Install radio control gear directly through top fuselage linkages will exposed routed interior fuselage Note directions optional coupled aileron/flap elevator Stack receiver battery wrap thin foam Measure assembly size RC box Build box 3/ balsa cut opening fuselage top sheeting just behind wing spar 18 Model Aviation fuselage side frames ready covered bias-grained balsa Bias balsa provides good diagonal stIffness rIgIdIty adding little weight Full-Size Plans Available Page 196 NOTE- DIAGONAL RIBS ARE SPLIT ON TB S INE DIAGONAL RIBS 6 REOUBEG I/IS BALSA I/B H /6 FIRN BALSA BR -IL 1/16 SHEOT TOP N BOTTOM THIS AREA L FOB FOEL TANS 0 AGONA RIB \KN RIB CAT CENTER TWO BIBS TO FIT BETWEEN DIAGONALSIS BEOGIBED I/IS BALSA I/A 3/B BALSAHINGE UNE ST-IN 1/16 BALSAWINOT P DE AlL CORER W/GAGSOH 3/32 DASS TGBE TBOE SELECTED HARDHARDRI B I/A SO SPARS~SGFT -A--- SOFT N ROLLED I/IS ISGFT FILL JUMPIN GEO DESGNEG AND DRAWN JOAN HANTON 1991 Cut openings rudder elevator servos top RC box choose optional coupled flaperon/elevator function youll also need cut hole aileron servo coupled aileron/flaps-elevator aileron servo slides shuttle actuated elevator servo ailerons move opposition elevator increased lift elevator moves up elevator servo pulls aileron servo aft droop flaps elevator moves down flaps raised Use 14-in -sq members mount servos positioning across fuselage under top sheeting Predrill holes servo screws prepare holes CyA Build up aileron servo shuttle track install fuselage Cut opening throttle servo Install servos have super transmitter may want use spoiler function servo wing rather coupled aileron/flaps-elevator function single servo Install front wheel side skids engine K&B Spider mount offers simple lightweight steerable nose wheel option point provided youve thinking light model should weigh ready go slightly over three pounds K&B 45 engine spinning 11 x 4 Rev-Up propeller recommended power setup Carefully check center-of-gravity Later balance point can incrementally moved rearward desired control response Begin slowly using recommended control throws build up gradually much control motion can handle Hying As mentioned model will fly successfully either fixed steerable nose wheel use spider-type mount does prototype steerable nose wheel can added little additional weight fixed nose wheel Jumpin Geo can steered using elevator keep nose light using prop blast over rudder make turn Its important practice repeatedly before taxiing out around people planes taxi too fast model will take off prematurely Any model design has built-in structural limitations Jumpin Geo dont use full control stick deflections flying fast want turn tight slow down first loops turns actually tighter start relatively slowly Use Continued page 93 November 1991 19 MATCH OTHER SHE 1/6 author bolts K&B 45 engine K&B spider mount permits installation lightweight steerable nose wheel Exposed BC gear gasp Gec sacrifices frills lightness aileron servo mounted shuttle actuated elevator servo coupled aileron/flapselevator function say about product call Ernst Ni-Cap protective cover fits brands Ni Cd glow plug igniters thousands other modelers have time another dropped glow plug igniters dirt have watched roll off table have put pockets have short out against keys some other metal object short out pocket few years ago after started Pylon Racer pitched air About five laps race felt something burning leg lucky enough get out before burned able finish race Ni-Cap does three things 1 prevents shorting 2 eliminates rolling glow plug igniter syndrome 3 keeps plug end clean foreign objects Ni-Cap orange plastic cap molded tether has loop end slips over shank glow plug igniter tether prevents losing cap also serves prevent glow plug igniter rolling off top field box landing dirt have word caution igniter use cap tether sticking out right angles shank igniter make sure facing away prop Should want buy Ni-Cap contact Ernst Manufacturing Inc 37396 Ruben Lane Sandy OR 97055 phone 503 668-5597 usually end up column wishing safe month now believe safe month dont feed body parts through rotating prop D Jumpin Geo/Hunton Continued page 19 four-pitch propeller keep airspeed down vertical capability up Models turn tightly produce considerable G-forces high speeds youll need exercise good sense Fun-fly model design entering golden age Most innovative aircraft use 0S 32 engine Jumpin Geo weve climbed 45 power yet still kept within three-pound wall Geo flies slowly unbelievably tightly also penetrates winds macho style airplane bridges gap between ubiquitous traditional Ugly Stick types delicate new-generation modelsthe sort usually employ least some high-tech materials purposely marginal design As fliers learn use capabilities Jumpin Geo its siblings will opening new chapter sport RC Aerobatics information about specialized fun-fly models have look Jerry Smiths built-up design December 1990 RC Report see Dan Stevenss hollowed-foam wing design February 1991 issue same magazine articles also provide good reference options building Jumpin Geo model really something else fly Its responsiveness will amaze its first contest FARM fun fly near Warrenton Virginia Jumpin Geo placed first time takeoff climb 15 seconds spot landing first Fast-Slow first takeoff number loops 30 seconds Geo unlikely excel AFTER YOU DID ALL THE WORK WHY LET YOUR AIRPLANE DO ALL THE FLYING INFO $500 AWARDED Grand Champion Reserve Grand Champion Ultralight 1989 Sun-N-Fun Fly-In BUILD & FLY THE miniMAX YOURSELF o Computer Designedr3 Axis Control o Part 103 Ultralight Easy Construction Wood Construction TEAM INC BOX 338M BRADY VILLE TN 37026 615 765-5397 November 1991 93 Spend less time buildin& mare tn Sheets available ONLY iu Thre ailable 1/16 x 12 x 35 Stock #6650 3/32x 12x 35- Stock #6651 1/8 x 12 x 35 Stock #6652 PMID PRODULru iIC 4shma Htff44tl994Z-1134 a199tMltPdUt5COlftC1 #5-91-153 Electric F ight Llghtweiglt 12 00money bark Adjustable switching point Soldertess terminal ror easy bookap $2 gna ee ON/OFF Controller995 Mare Powe sa ewe gh 20 Size 22xt3x63 el1trenry anty 006V loss Add S1 ohippio3 Clifoois araidonls add 725% 12 17 Tao Send Check money order Comes sith//High Sky Fntabaoranartrr3929 Kansas St #9 other Cosrectors orer.2. flA 92104 olso availableSan uuun beauty contest otherwise its probably unmatched Jumpin Geo puts whole new perspective RC flying makes fun-flying challenge again Build yourselfand enjoy0 Show Begin/Iden Continued page 25 Circlemaster AST Sussex Wisconsin Safety number have show teams performing before hundreds thousands people safety primary Sometimes lessons learned away show practice field pretty 4-scale Sig Cub shown photos belonged note past tense yours truly Cub yet fly air show offing little yellow OS 40 four-cyclepowered ship favorites made some 30 flights cartwheeled several times nasty crosswinds before two successful takeoffs during slow roll wings suddenly snapped right center model streamed straight hard drought-baked ground two wing panels fluttered earth drove home safety lesson Check aircraft thoroughly after seemingly minor toss-around checked wings various other important parts after cartwheels appeared order Struts secure points landing gear unscathed tail section solid no flex wings etc taken time remove wings cabin however examined center section would have found fractureprobably very smallin front center section cabin stress wires attach front wing fuselage Thats structural failure apparently occurred Its Satisfaction Guaranteedi EAYHINI 5H-710 Pkg 24 $2 95 THE HIGH-TECH HINGE DESIGNED FOR THE CYANOACRYLATE AGE Easier install other hinge No gouging picking messy epoxies Simply cut single knife slot hinge slide hinges place apply few drops favorite CA glue youre done SUPER FAST SUPER EASY SUPER STRONG 7de ee4 fo e4a MFG CO INC.401-7 So Front St.Montezuma IA 50171 623-5154 PRODUCTS FOR THE DISCERNING MODELER Complete Line Exhaust Systems * Tuned Pipes Muffled Tuned Pipes * Headers * Venturi Mufflers * Expansion Mufflers copter Ball Mufflers ialized Exhaust Systems Unsurpassel W,ki,n Drfomanc 94 Model Aviation TAKE THE HOBBY SHOP HOME WITH YOUM THE 15th ANNUAL RADIO CONTROL BUYERS GUIDE ts reference gutde oIl R/C hobbies Browse through guide find items need ond youll know just whot ask favorite hobby shop RADIO CONTROL BUYERS GUIDE lets turn wish list o shopping list knowing whats ovoilable con plan new projects improve existing projects Price informotion olso helps add up just whot plons will cost Look RADIO CONTROL BUYERS GUIDE local hobby shop call 800 533-6644 order ccc... eeceoccc ceoceec c eeecec eec Jo order send Dept X0419 RADIO CONTROL BUYERS GUIDE PO Box 1612 WaukeshaWI 53187-1612 YES Id like order _____ RADIO CONTROL BUYERS GUIDES #13002 $ ______ J Payment enclosed J Charge account Please print Name_________________________________________________ Street______________________________________________________[v33][b22911249163110790]] City State Zip__________________________________________________ Country_____________________________________________________[v33][b24421331183111470]] Charge Li Mastercard Li Visa Li American Express mm $15 Card#_________________________ Exp Date_____________ Signature Include tar postage handling US 3300 canadian tareign add 18% minimum $400 Wisconsin residents add 5% sales tas canadian araers add 7% GST ta tatal Price availability sublect ta change Payable US tunds Dept X0479
Edition: Model Aviation - 1991/11
Page Numbers: 12, 13, 14, 15, 16, 17, 18, 19, 93, 94
I Above Using geodesics lightness coupled torsional strength Jumpin Geo puts whole new perspective compe tition fun-flying makes challenge again As fliers learn use performance capabilities design Its siblings will open new chapter sport RC Aerobatics Below K&B 45 engine spinning Rev-Up 11 x 4 prop produces over three pounds static thrust giving Geo full vertical capability Maneuvers incredibly close-In tight Put good 45 glow engine 3-lb RCer start blowing away competition fun-fly events EJohn Hunton U Bill Winter TO EXCEL fun-fly events model must able maneuver quickly tightly about axes means must weigh very little have low wing loading Jumpin Geo excels fun-flying points new direction RC airplanes designed such events Overall performance maneuverability incredibleunlike anything ever seen RC model Maneuvers remarkably close-in tightloops rolls take about secondand turns unbelievably quick plane has full vertical capability achieve desired lightness sacrificing strength used geodesics torsional rigidity flying surfaces fuselage eliminates need usual D-tube sheet leading edge Also since front wing nonstructural can cut out fuel tank Taking advantage lack emphasis high velocities fun-fly events designed economical structure considerable thickness flying surfaces interdependent spaceframe like members produce extremely light structure still allows full range speed flight Because lightness coupled elevator aileron/flaps model can also flown remarkably slowly Jumpin Geo weighs close three pounds built care uses 40 45 engine K&B sport 45 swinging Rev-Up 11 x 4 propeller produces well over three pounds static thrust giving spectacular vertical performance Take off point airplane up will reach sky Construction Since very lightweight models require simplified structures theyre relatively fast easy build can save few ounces using optional rolled sheet leading edges flying surfaces substitute relatively soft x -in rounded balsa youre using rolled sheet its good idea begin preforming surfaces November 1991 13 Vertical performance impressive model takes off couple feet has known sprint unexpectedly air during taxiing models can take straight up rolling author highly competitive Tun tiler traces its design roots such CL novations HA Thomass coupled flap/elevator concept Stunt models introduced 1947 Huntons may geodesic fun-fly RC will hold together full bore Left rolied tube ol son Vie sneet Daisa used leading edges movable surfaces fin stabilizer ne sneets wetted formed successively around -in %-ln dowels wing leading edge also 1A sheet molded broomstick single step Sections made wrapping wetted sheet around form elastic bandage Right wing ribs can stack sawn full-length ribs installed bias interrupted ribs other Start center work toward tip Special construction features Build wing leading edge fairing soaking two-inch wide strip /16 medium-soft balsa strip rolling around broomstick Soak strip hot water least hour tape end side broomstick Wrap balsa around broomstick Ace bandage Allow assembly thoroughly dry leaving warm place overnight Remove bandage have nicely formed leading edge fairing Use 36-in-long hardwood dowels 3A-in two %-in diameter leading edges other flying surfaces Soak 1-in strip soft /16 balsa wrap around 3A-in dowel allow assembly dry overnight Remove balsa soak again wrap around pair %-in dowels glued together Roll another strip 3A-in dowel repeat two-step procedure balsa cracks use softer strips next time Make enough leading edge material entire model plus reserve Lone Star Models 1623 57th St Lubbock TX 79412 excellent balsa supplier following order will provide almost everything need 26 sheets A6 x 3-in selected soft 6-9 lb/cu ft selecting costs additional 15% two sheets /8 x 4-in selected soft four sheets /16 x 4-in unselected 12 sheets sq eight 4 x also unselected Youre provided surplus select Youll also need some A-in-thick plywood firewall other thicknesses aileron/flap servo mechanism wing skid shear plates Go through balsa own selecting Holding sheet up bare light bulb allows its characteristics come shining through Save wood straightest clearest grain rolling leading edges use rest ribs Wing Building geodesic wing looks lot challenging Its interesting task really difficult jigsaw band saw available stack saw ribs cut few extra ribs parts youll have hand easy repairs Battle damage tends limited structure lightweight Cut wing ribs half Begin building either top bottom wing half flat board pin full-length ribs direction fill partial ribs other direction 14 Model Aviation wing spars constant cross section variable density accommodate differing structural loads Firm wood used center section wIth soft wood tip xx INzK w t wing half built flat board over plan installing ribs cen ter outward prevents compounding errors wing center section spar webbing Bias balsa filler installed center bay help distribute flight loads between top bottom spars Left Note sculptural quality completed wing half second half can built directly stop first pinning latter down spar bracing up trailing edge Right aileron/flaps elevator rudder identical cross section use same ribs diagonals diagonal bracing greatly improves torsional stiffness Ultralight rolled balsa leading edges can used NO OCR TEXT Full-Size Plans Available. Page 196 I/B H I/H FIRM BALSW. DIAGONAL RIB HORNR ERR HGEUNE- ~INRO06 SREE I/AG 3/B H1 RD BALSAI/lB H I/Z~ I/lB H 3/B HORARTS HINGE POINTS______ 1/16 0 I/O TRIM RIB FOR I/lB SHEET TOP AND BOTTOMI IN ROLLED 1/16 IN SHEET SLOT FOR FIN POST I/HO DETAIL / / / AV SEE STABILIZER ELEVATORFOf II II1/40 3/B HARD BALSA POST IIORNOPP II BS 1 IADO BOUNDAN BOB N PO I-BE ORE N ALLN 1iACOT OUT WING EL TANK I r FOR BOOBBASA BHR H SGNOERONS FIBEWALL TEMPBALANCE POINT TORE COLAR-1 I/B IN WIREOPTIONAL SSF~ iOPTIONALLONG NOSEMINI -SEHVI FORBATTERY/RECEIVERBIBS BALSA I/lW WIRESPIDER MOUNTTRROT IN BOTTOMBOO 3/30 BALSA 50 PP OR TBASSWOODBROD GUIDERIBS 1kB FIN 6000 STAB ELEUAILEBOBS FOR KWH 45 SPOBYSTERI I II 47/A RNB 0006I--I- TEMP RD ELEWOR B 0 SHEE J UMPIN G EO DESIGNED AND GRAWI JOHN HONTON199 would lead cumulative errors Instead start center work toward tip errors begin creep just make sure keep ribs absolutely parallel plan position eventually theyll work out Except otherwise noted use medium-density balsa Since variations will occur balsa put advantage using harder ribs middle softer ones toward tips Use CyA cyanoacrylate glue assembly except another adhesive specified wing spars laminated different densities balsa hard wood middle lighter density tips wood should selected carefully Join spar pairs Install spar trailing edge surface sheet rib assembly remove building board Youll note assembly already has high torsional strength Strength bending however poor Pin down completed wing half spar brace up trailing edge build second half over first Install remaiaing ribs second spar trailing edge piece Reinforce center bay wing spar layer bias-grained balsa bias balsasheets /I6 balsa glued together grain opposite 45 B angles material very light yet provides good diagonal stiffness rigidity Add diagonal spar bracing Add trailing edge vertical sheet rolled leading edge Shave necessary ribs add center section sheet Build up tips Fit A6 skid shear plates under wings Cover sheets spar area lightweight fiberglass CyA Drill install %2-ID brass tubes Coat tubes rib intersection baking soda CyA Block sand wing using large sanding block Take care overdo sanding ribs between joints Check reglue open joints Add about oz weight left tip counteract offset weight engine cylinder muffler may have adjust amount later Build remaining flying surfaces Pin down leading edge add true ribs trailing edge Fit diagonals assembly flat bench diagonal members cut same basic shape 16 Model Aviation CI CUT TO ViA VI CLEAR LI \TAHW2J NO BIAS BALSA PRE- FORMED WITH TWO LAYERS I/lB BALSA WITH GRAIN 45 OPPOSITE DIRECTICNS\, stabilizer elevator under construc tion stab fin built up -inthick ribs root sections reinforced firm solid balsa stub spars fuselage sides made bias balsa sheets 1A balsa glued together grain opposite 450 angles Half weight Lite Ply good strength sheets preassembled slow-setting cyanoacrylate installed fuse lage frame trimmed Full-Size Plans Available Page 196 WA ~--flMA A4 BAII ORII II GRAM INITIAL CONTROL TRROWS RODDER Z5 ELECATOR DO AILERON 20 FLAP ADDS 15 W RE SPACE CONTROLS SEROD INSTALLATION LAPAORDER ____ W AXJX FRAME I/B LITEPLO ERS-/S LITEPLY AD C KEEPERS I/S LITEPLO SHUTTLE 3/SD AIRCRAFT PLF AADRORT MOONTRA S55 SRDRT MOONS 6-3D SCREWS NOTCH WIRE5/32 IE RRASS TORE LIGHTENIND ROLESCREW I/A PLYWOODSOLDER LAD WIRE WRAPSILOER SOLDER I/S M W3/3D M LITEWEIGHT WREEL SHORT MDANT -LSNS NDSE FIRED WREEL OPTION WIND SKID DETAIL FORMED LE DETAIL FOR TAIL AILERONS MATER LINE IJUMPIN GEo DE SIDNED AND DRAWN JOHN RANTDN1991 complicating factor otherwise straightforward wing construction sanding aileron/flap tips Build tips flat bench Sand top surfaces proper thickness bring surfaces alignment rest structure bottom surfaces tips will sweep upward giving appearance being warped Place flat area top apparentiy warped area bottom addition producing tapered tips irregularity creates certain amount washout upright wing improves stall characteristics stabilizer rudder built -in-deep ribs diagonals Fuselage Builders options either fuselage long nose short mount short fuselage spider mount spider mount permits installation simple lightweight steerable nose wheel See Flying section viewpoint opinions Begin fuselage construction building up bias-grained sheets A6 stock ouflined wing construction section using slow-cure thick CyA Select hard straight-grained wood longerons Soak four longerons hot water Pin down over plans add uprights note temporary verticals Allow assembly dry overnight remove hom board Add top bottom crosspieces Install firewall 6-32 blind nuts place engine mounting Cover fuselage bias-grained sheeting front A-in sheeting toward rear Round fuselage corners carving sanding Cut openings wing-fuselage joint As final step before assembly add baking soda fillets fortified CyA inside nose area Landing gear system Jumpin Geo uses combination nose wheel wing skids Although saves weight makes very poor taxiing characteristics low speed Taxi grass extreme care nose wheel/wing skid system does give excellent performance high ground speeds means can plant model having stall landing touchdown great touch-andgoes over line skids literally grab grass can keep power steer confidence pull up go again will could add wheels skids small weight penalty Tailor Geo way youll flying competition Covering Cover surfaces using lightest material practical used transparent MonoKote prototype since seems lighter solid-colored variety first prototype covered single color November 1991 17 fuselage sides built directly atop other sake accuracy Use waxed pa per over plan betwen sides prevent unwanted adhesion photographic purposes easy quick orientation however its good idea put large identifying color swatches top bottom cover top bottom different colors second prototype covered Micafilm lighter weight MonoKote Cut covering material mating surfaces assemble parts Use baking soda fillets CyA such critical areas wing stab installations Since wing removable hinge ailerons until wing installation has completed Complete hinging installation epoxy install control horns Final assembly Install round four-ounce fuel tank front fuselage/wing area Cut disc plastic top margarine container cover fuel tank hole firewall Drill disc engine mount holes fuel lines Seal plastic firewall silicone sealant Install radio control gear directly through top fuselage linkages will exposed routed interior fuselage Note directions optional coupled aileron/flap elevator Stack receiver battery wrap thin foam Measure assembly size RC box Build box 3/ balsa cut opening fuselage top sheeting just behind wing spar 18 Model Aviation fuselage side frames ready covered bias-grained balsa Bias balsa provides good diagonal stIffness rIgIdIty adding little weight Full-Size Plans Available Page 196 NOTE- DIAGONAL RIBS ARE SPLIT ON TB S INE DIAGONAL RIBS 6 REOUBEG I/IS BALSA I/B H /6 FIRN BALSA BR -IL 1/16 SHEOT TOP N BOTTOM THIS AREA L FOB FOEL TANS 0 AGONA RIB \KN RIB CAT CENTER TWO BIBS TO FIT BETWEEN DIAGONALSIS BEOGIBED I/IS BALSA I/A 3/B BALSAHINGE UNE ST-IN 1/16 BALSAWINOT P DE AlL CORER W/GAGSOH 3/32 DASS TGBE TBOE SELECTED HARDHARDRI B I/A SO SPARS~SGFT -A--- SOFT N ROLLED I/IS ISGFT FILL JUMPIN GEO DESGNEG AND DRAWN JOAN HANTON 1991 Cut openings rudder elevator servos top RC box choose optional coupled flaperon/elevator function youll also need cut hole aileron servo coupled aileron/flaps-elevator aileron servo slides shuttle actuated elevator servo ailerons move opposition elevator increased lift elevator moves up elevator servo pulls aileron servo aft droop flaps elevator moves down flaps raised Use 14-in -sq members mount servos positioning across fuselage under top sheeting Predrill holes servo screws prepare holes CyA Build up aileron servo shuttle track install fuselage Cut opening throttle servo Install servos have super transmitter may want use spoiler function servo wing rather coupled aileron/flaps-elevator function single servo Install front wheel side skids engine K&B Spider mount offers simple lightweight steerable nose wheel option point provided youve thinking light model should weigh ready go slightly over three pounds K&B 45 engine spinning 11 x 4 Rev-Up propeller recommended power setup Carefully check center-of-gravity Later balance point can incrementally moved rearward desired control response Begin slowly using recommended control throws build up gradually much control motion can handle Hying As mentioned model will fly successfully either fixed steerable nose wheel use spider-type mount does prototype steerable nose wheel can added little additional weight fixed nose wheel Jumpin Geo can steered using elevator keep nose light using prop blast over rudder make turn Its important practice repeatedly before taxiing out around people planes taxi too fast model will take off prematurely Any model design has built-in structural limitations Jumpin Geo dont use full control stick deflections flying fast want turn tight slow down first loops turns actually tighter start relatively slowly Use Continued page 93 November 1991 19 MATCH OTHER SHE 1/6 author bolts K&B 45 engine K&B spider mount permits installation lightweight steerable nose wheel Exposed BC gear gasp Gec sacrifices frills lightness aileron servo mounted shuttle actuated elevator servo coupled aileron/flapselevator function say about product call Ernst Ni-Cap protective cover fits brands Ni Cd glow plug igniters thousands other modelers have time another dropped glow plug igniters dirt have watched roll off table have put pockets have short out against keys some other metal object short out pocket few years ago after started Pylon Racer pitched air About five laps race felt something burning leg lucky enough get out before burned able finish race Ni-Cap does three things 1 prevents shorting 2 eliminates rolling glow plug igniter syndrome 3 keeps plug end clean foreign objects Ni-Cap orange plastic cap molded tether has loop end slips over shank glow plug igniter tether prevents losing cap also serves prevent glow plug igniter rolling off top field box landing dirt have word caution igniter use cap tether sticking out right angles shank igniter make sure facing away prop Should want buy Ni-Cap contact Ernst Manufacturing Inc 37396 Ruben Lane Sandy OR 97055 phone 503 668-5597 usually end up column wishing safe month now believe safe month dont feed body parts through rotating prop D Jumpin Geo/Hunton Continued page 19 four-pitch propeller keep airspeed down vertical capability up Models turn tightly produce considerable G-forces high speeds youll need exercise good sense Fun-fly model design entering golden age Most innovative aircraft use 0S 32 engine Jumpin Geo weve climbed 45 power yet still kept within three-pound wall Geo flies slowly unbelievably tightly also penetrates winds macho style airplane bridges gap between ubiquitous traditional Ugly Stick types delicate new-generation modelsthe sort usually employ least some high-tech materials purposely marginal design As fliers learn use capabilities Jumpin Geo its siblings will opening new chapter sport RC Aerobatics information about specialized fun-fly models have look Jerry Smiths built-up design December 1990 RC Report see Dan Stevenss hollowed-foam wing design February 1991 issue same magazine articles also provide good reference options building Jumpin Geo model really something else fly Its responsiveness will amaze its first contest FARM fun fly near Warrenton Virginia Jumpin Geo placed first time takeoff climb 15 seconds spot landing first Fast-Slow first takeoff number loops 30 seconds Geo unlikely excel AFTER YOU DID ALL THE WORK WHY LET YOUR AIRPLANE DO ALL THE FLYING INFO $500 AWARDED Grand Champion Reserve Grand Champion Ultralight 1989 Sun-N-Fun Fly-In BUILD & FLY THE miniMAX YOURSELF o Computer Designedr3 Axis Control o Part 103 Ultralight Easy Construction Wood Construction TEAM INC BOX 338M BRADY VILLE TN 37026 615 765-5397 November 1991 93 Spend less time buildin& mare tn Sheets available ONLY iu Thre ailable 1/16 x 12 x 35 Stock #6650 3/32x 12x 35- Stock #6651 1/8 x 12 x 35 Stock #6652 PMID PRODULru iIC 4shma Htff44tl994Z-1134 a199tMltPdUt5COlftC1 #5-91-153 Electric F ight Llghtweiglt 12 00money bark Adjustable switching point Soldertess terminal ror easy bookap $2 gna ee ON/OFF Controller995 Mare Powe sa ewe gh 20 Size 22xt3x63 el1trenry anty 006V loss Add S1 ohippio3 Clifoois araidonls add 725% 12 17 Tao Send Check money order Comes sith//High Sky Fntabaoranartrr3929 Kansas St #9 other Cosrectors orer.2. flA 92104 olso availableSan uuun beauty contest otherwise its probably unmatched Jumpin Geo puts whole new perspective RC flying makes fun-flying challenge again Build yourselfand enjoy0 Show Begin/Iden Continued page 25 Circlemaster AST Sussex Wisconsin Safety number have show teams performing before hundreds thousands people safety primary Sometimes lessons learned away show practice field pretty 4-scale Sig Cub shown photos belonged note past tense yours truly Cub yet fly air show offing little yellow OS 40 four-cyclepowered ship favorites made some 30 flights cartwheeled several times nasty crosswinds before two successful takeoffs during slow roll wings suddenly snapped right center model streamed straight hard drought-baked ground two wing panels fluttered earth drove home safety lesson Check aircraft thoroughly after seemingly minor toss-around checked wings various other important parts after cartwheels appeared order Struts secure points landing gear unscathed tail section solid no flex wings etc taken time remove wings cabin however examined center section would have found fractureprobably very smallin front center section cabin stress wires attach front wing fuselage Thats structural failure apparently occurred Its Satisfaction Guaranteedi EAYHINI 5H-710 Pkg 24 $2 95 THE HIGH-TECH HINGE DESIGNED FOR THE CYANOACRYLATE AGE Easier install other hinge No gouging picking messy epoxies Simply cut single knife slot hinge slide hinges place apply few drops favorite CA glue youre done SUPER FAST SUPER EASY SUPER STRONG 7de ee4 fo e4a MFG CO INC.401-7 So Front St.Montezuma IA 50171 623-5154 PRODUCTS FOR THE DISCERNING MODELER Complete Line Exhaust Systems * Tuned Pipes Muffled Tuned Pipes * Headers * Venturi Mufflers * Expansion Mufflers copter Ball Mufflers ialized Exhaust Systems Unsurpassel W,ki,n Drfomanc 94 Model Aviation TAKE THE HOBBY SHOP HOME WITH YOUM THE 15th ANNUAL RADIO CONTROL BUYERS GUIDE ts reference gutde oIl R/C hobbies Browse through guide find items need ond youll know just whot ask favorite hobby shop RADIO CONTROL BUYERS GUIDE lets turn wish list o shopping list knowing whats ovoilable con plan new projects improve existing projects Price informotion olso helps add up just whot plons will cost Look RADIO CONTROL BUYERS GUIDE local hobby shop call 800 533-6644 order ccc... eeceoccc ceoceec c eeecec eec Jo order send Dept X0419 RADIO CONTROL BUYERS GUIDE PO Box 1612 WaukeshaWI 53187-1612 YES Id like order _____ RADIO CONTROL BUYERS GUIDES #13002 $ ______ J Payment enclosed J Charge account Please print Name_________________________________________________ Street______________________________________________________[v33][b22911249163110790]] City State Zip__________________________________________________ Country_____________________________________________________[v33][b24421331183111470]] Charge Li Mastercard Li Visa Li American Express mm $15 Card#_________________________ Exp Date_____________ Signature Include tar postage handling US 3300 canadian tareign add 18% minimum $400 Wisconsin residents add 5% sales tas canadian araers add 7% GST ta tatal Price availability sublect ta change Payable US tunds Dept X0479
Edition: Model Aviation - 1991/11
Page Numbers: 12, 13, 14, 15, 16, 17, 18, 19, 93, 94
I Above Using geodesics lightness coupled torsional strength Jumpin Geo puts whole new perspective compe tition fun-flying makes challenge again As fliers learn use performance capabilities design Its siblings will open new chapter sport RC Aerobatics Below K&B 45 engine spinning Rev-Up 11 x 4 prop produces over three pounds static thrust giving Geo full vertical capability Maneuvers incredibly close-In tight Put good 45 glow engine 3-lb RCer start blowing away competition fun-fly events EJohn Hunton U Bill Winter TO EXCEL fun-fly events model must able maneuver quickly tightly about axes means must weigh very little have low wing loading Jumpin Geo excels fun-flying points new direction RC airplanes designed such events Overall performance maneuverability incredibleunlike anything ever seen RC model Maneuvers remarkably close-in tightloops rolls take about secondand turns unbelievably quick plane has full vertical capability achieve desired lightness sacrificing strength used geodesics torsional rigidity flying surfaces fuselage eliminates need usual D-tube sheet leading edge Also since front wing nonstructural can cut out fuel tank Taking advantage lack emphasis high velocities fun-fly events designed economical structure considerable thickness flying surfaces interdependent spaceframe like members produce extremely light structure still allows full range speed flight Because lightness coupled elevator aileron/flaps model can also flown remarkably slowly Jumpin Geo weighs close three pounds built care uses 40 45 engine K&B sport 45 swinging Rev-Up 11 x 4 propeller produces well over three pounds static thrust giving spectacular vertical performance Take off point airplane up will reach sky Construction Since very lightweight models require simplified structures theyre relatively fast easy build can save few ounces using optional rolled sheet leading edges flying surfaces substitute relatively soft x -in rounded balsa youre using rolled sheet its good idea begin preforming surfaces November 1991 13 Vertical performance impressive model takes off couple feet has known sprint unexpectedly air during taxiing models can take straight up rolling author highly competitive Tun tiler traces its design roots such CL novations HA Thomass coupled flap/elevator concept Stunt models introduced 1947 Huntons may geodesic fun-fly RC will hold together full bore Left rolied tube ol son Vie sneet Daisa used leading edges movable surfaces fin stabilizer ne sneets wetted formed successively around -in %-ln dowels wing leading edge also 1A sheet molded broomstick single step Sections made wrapping wetted sheet around form elastic bandage Right wing ribs can stack sawn full-length ribs installed bias interrupted ribs other Start center work toward tip Special construction features Build wing leading edge fairing soaking two-inch wide strip /16 medium-soft balsa strip rolling around broomstick Soak strip hot water least hour tape end side broomstick Wrap balsa around broomstick Ace bandage Allow assembly thoroughly dry leaving warm place overnight Remove bandage have nicely formed leading edge fairing Use 36-in-long hardwood dowels 3A-in two %-in diameter leading edges other flying surfaces Soak 1-in strip soft /16 balsa wrap around 3A-in dowel allow assembly dry overnight Remove balsa soak again wrap around pair %-in dowels glued together Roll another strip 3A-in dowel repeat two-step procedure balsa cracks use softer strips next time Make enough leading edge material entire model plus reserve Lone Star Models 1623 57th St Lubbock TX 79412 excellent balsa supplier following order will provide almost everything need 26 sheets A6 x 3-in selected soft 6-9 lb/cu ft selecting costs additional 15% two sheets /8 x 4-in selected soft four sheets /16 x 4-in unselected 12 sheets sq eight 4 x also unselected Youre provided surplus select Youll also need some A-in-thick plywood firewall other thicknesses aileron/flap servo mechanism wing skid shear plates Go through balsa own selecting Holding sheet up bare light bulb allows its characteristics come shining through Save wood straightest clearest grain rolling leading edges use rest ribs Wing Building geodesic wing looks lot challenging Its interesting task really difficult jigsaw band saw available stack saw ribs cut few extra ribs parts youll have hand easy repairs Battle damage tends limited structure lightweight Cut wing ribs half Begin building either top bottom wing half flat board pin full-length ribs direction fill partial ribs other direction 14 Model Aviation wing spars constant cross section variable density accommodate differing structural loads Firm wood used center section wIth soft wood tip xx INzK w t wing half built flat board over plan installing ribs cen ter outward prevents compounding errors wing center section spar webbing Bias balsa filler installed center bay help distribute flight loads between top bottom spars Left Note sculptural quality completed wing half second half can built directly stop first pinning latter down spar bracing up trailing edge Right aileron/flaps elevator rudder identical cross section use same ribs diagonals diagonal bracing greatly improves torsional stiffness Ultralight rolled balsa leading edges can used NO OCR TEXT Full-Size Plans Available. Page 196 I/B H I/H FIRM BALSW. DIAGONAL RIB HORNR ERR HGEUNE- ~INRO06 SREE I/AG 3/B H1 RD BALSAI/lB H I/Z~ I/lB H 3/B HORARTS HINGE POINTS______ 1/16 0 I/O TRIM RIB FOR I/lB SHEET TOP AND BOTTOMI IN ROLLED 1/16 IN SHEET SLOT FOR FIN POST I/HO DETAIL / / / AV SEE STABILIZER ELEVATORFOf II II1/40 3/B HARD BALSA POST IIORNOPP II BS 1 IADO BOUNDAN BOB N PO I-BE ORE N ALLN 1iACOT OUT WING EL TANK I r FOR BOOBBASA BHR H SGNOERONS FIBEWALL TEMPBALANCE POINT TORE COLAR-1 I/B IN WIREOPTIONAL SSF~ iOPTIONALLONG NOSEMINI -SEHVI FORBATTERY/RECEIVERBIBS BALSA I/lW WIRESPIDER MOUNTTRROT IN BOTTOMBOO 3/30 BALSA 50 PP OR TBASSWOODBROD GUIDERIBS 1kB FIN 6000 STAB ELEUAILEBOBS FOR KWH 45 SPOBYSTERI I II 47/A RNB 0006I--I- TEMP RD ELEWOR B 0 SHEE J UMPIN G EO DESIGNED AND GRAWI JOHN HONTON199 would lead cumulative errors Instead start center work toward tip errors begin creep just make sure keep ribs absolutely parallel plan position eventually theyll work out Except otherwise noted use medium-density balsa Since variations will occur balsa put advantage using harder ribs middle softer ones toward tips Use CyA cyanoacrylate glue assembly except another adhesive specified wing spars laminated different densities balsa hard wood middle lighter density tips wood should selected carefully Join spar pairs Install spar trailing edge surface sheet rib assembly remove building board Youll note assembly already has high torsional strength Strength bending however poor Pin down completed wing half spar brace up trailing edge build second half over first Install remaiaing ribs second spar trailing edge piece Reinforce center bay wing spar layer bias-grained balsa bias balsasheets /I6 balsa glued together grain opposite 45 B angles material very light yet provides good diagonal stiffness rigidity Add diagonal spar bracing Add trailing edge vertical sheet rolled leading edge Shave necessary ribs add center section sheet Build up tips Fit A6 skid shear plates under wings Cover sheets spar area lightweight fiberglass CyA Drill install %2-ID brass tubes Coat tubes rib intersection baking soda CyA Block sand wing using large sanding block Take care overdo sanding ribs between joints Check reglue open joints Add about oz weight left tip counteract offset weight engine cylinder muffler may have adjust amount later Build remaining flying surfaces Pin down leading edge add true ribs trailing edge Fit diagonals assembly flat bench diagonal members cut same basic shape 16 Model Aviation CI CUT TO ViA VI CLEAR LI \TAHW2J NO BIAS BALSA PRE- FORMED WITH TWO LAYERS I/lB BALSA WITH GRAIN 45 OPPOSITE DIRECTICNS\, stabilizer elevator under construc tion stab fin built up -inthick ribs root sections reinforced firm solid balsa stub spars fuselage sides made bias balsa sheets 1A balsa glued together grain opposite 450 angles Half weight Lite Ply good strength sheets preassembled slow-setting cyanoacrylate installed fuse lage frame trimmed Full-Size Plans Available Page 196 WA ~--flMA A4 BAII ORII II GRAM INITIAL CONTROL TRROWS RODDER Z5 ELECATOR DO AILERON 20 FLAP ADDS 15 W RE SPACE CONTROLS SEROD INSTALLATION LAPAORDER ____ W AXJX FRAME I/B LITEPLO ERS-/S LITEPLY AD C KEEPERS I/S LITEPLO SHUTTLE 3/SD AIRCRAFT PLF AADRORT MOONTRA S55 SRDRT MOONS 6-3D SCREWS NOTCH WIRE5/32 IE RRASS TORE LIGHTENIND ROLESCREW I/A PLYWOODSOLDER LAD WIRE WRAPSILOER SOLDER I/S M W3/3D M LITEWEIGHT WREEL SHORT MDANT -LSNS NDSE FIRED WREEL OPTION WIND SKID DETAIL FORMED LE DETAIL FOR TAIL AILERONS MATER LINE IJUMPIN GEo DE SIDNED AND DRAWN JOHN RANTDN1991 complicating factor otherwise straightforward wing construction sanding aileron/flap tips Build tips flat bench Sand top surfaces proper thickness bring surfaces alignment rest structure bottom surfaces tips will sweep upward giving appearance being warped Place flat area top apparentiy warped area bottom addition producing tapered tips irregularity creates certain amount washout upright wing improves stall characteristics stabilizer rudder built -in-deep ribs diagonals Fuselage Builders options either fuselage long nose short mount short fuselage spider mount spider mount permits installation simple lightweight steerable nose wheel See Flying section viewpoint opinions Begin fuselage construction building up bias-grained sheets A6 stock ouflined wing construction section using slow-cure thick CyA Select hard straight-grained wood longerons Soak four longerons hot water Pin down over plans add uprights note temporary verticals Allow assembly dry overnight remove hom board Add top bottom crosspieces Install firewall 6-32 blind nuts place engine mounting Cover fuselage bias-grained sheeting front A-in sheeting toward rear Round fuselage corners carving sanding Cut openings wing-fuselage joint As final step before assembly add baking soda fillets fortified CyA inside nose area Landing gear system Jumpin Geo uses combination nose wheel wing skids Although saves weight makes very poor taxiing characteristics low speed Taxi grass extreme care nose wheel/wing skid system does give excellent performance high ground speeds means can plant model having stall landing touchdown great touch-andgoes over line skids literally grab grass can keep power steer confidence pull up go again will could add wheels skids small weight penalty Tailor Geo way youll flying competition Covering Cover surfaces using lightest material practical used transparent MonoKote prototype since seems lighter solid-colored variety first prototype covered single color November 1991 17 fuselage sides built directly atop other sake accuracy Use waxed pa per over plan betwen sides prevent unwanted adhesion photographic purposes easy quick orientation however its good idea put large identifying color swatches top bottom cover top bottom different colors second prototype covered Micafilm lighter weight MonoKote Cut covering material mating surfaces assemble parts Use baking soda fillets CyA such critical areas wing stab installations Since wing removable hinge ailerons until wing installation has completed Complete hinging installation epoxy install control horns Final assembly Install round four-ounce fuel tank front fuselage/wing area Cut disc plastic top margarine container cover fuel tank hole firewall Drill disc engine mount holes fuel lines Seal plastic firewall silicone sealant Install radio control gear directly through top fuselage linkages will exposed routed interior fuselage Note directions optional coupled aileron/flap elevator Stack receiver battery wrap thin foam Measure assembly size RC box Build box 3/ balsa cut opening fuselage top sheeting just behind wing spar 18 Model Aviation fuselage side frames ready covered bias-grained balsa Bias balsa provides good diagonal stIffness rIgIdIty adding little weight Full-Size Plans Available Page 196 NOTE- DIAGONAL RIBS ARE SPLIT ON TB S INE DIAGONAL RIBS 6 REOUBEG I/IS BALSA I/B H /6 FIRN BALSA BR -IL 1/16 SHEOT TOP N BOTTOM THIS AREA L FOB FOEL TANS 0 AGONA RIB \KN RIB CAT CENTER TWO BIBS TO FIT BETWEEN DIAGONALSIS BEOGIBED I/IS BALSA I/A 3/B BALSAHINGE UNE ST-IN 1/16 BALSAWINOT P DE AlL CORER W/GAGSOH 3/32 DASS TGBE TBOE SELECTED HARDHARDRI B I/A SO SPARS~SGFT -A--- SOFT N ROLLED I/IS ISGFT FILL JUMPIN GEO DESGNEG AND DRAWN JOAN HANTON 1991 Cut openings rudder elevator servos top RC box choose optional coupled flaperon/elevator function youll also need cut hole aileron servo coupled aileron/flaps-elevator aileron servo slides shuttle actuated elevator servo ailerons move opposition elevator increased lift elevator moves up elevator servo pulls aileron servo aft droop flaps elevator moves down flaps raised Use 14-in -sq members mount servos positioning across fuselage under top sheeting Predrill holes servo screws prepare holes CyA Build up aileron servo shuttle track install fuselage Cut opening throttle servo Install servos have super transmitter may want use spoiler function servo wing rather coupled aileron/flaps-elevator function single servo Install front wheel side skids engine K&B Spider mount offers simple lightweight steerable nose wheel option point provided youve thinking light model should weigh ready go slightly over three pounds K&B 45 engine spinning 11 x 4 Rev-Up propeller recommended power setup Carefully check center-of-gravity Later balance point can incrementally moved rearward desired control response Begin slowly using recommended control throws build up gradually much control motion can handle Hying As mentioned model will fly successfully either fixed steerable nose wheel use spider-type mount does prototype steerable nose wheel can added little additional weight fixed nose wheel Jumpin Geo can steered using elevator keep nose light using prop blast over rudder make turn Its important practice repeatedly before taxiing out around people planes taxi too fast model will take off prematurely Any model design has built-in structural limitations Jumpin Geo dont use full control stick deflections flying fast want turn tight slow down first loops turns actually tighter start relatively slowly Use Continued page 93 November 1991 19 MATCH OTHER SHE 1/6 author bolts K&B 45 engine K&B spider mount permits installation lightweight steerable nose wheel Exposed BC gear gasp Gec sacrifices frills lightness aileron servo mounted shuttle actuated elevator servo coupled aileron/flapselevator function say about product call Ernst Ni-Cap protective cover fits brands Ni Cd glow plug igniters thousands other modelers have time another dropped glow plug igniters dirt have watched roll off table have put pockets have short out against keys some other metal object short out pocket few years ago after started Pylon Racer pitched air About five laps race felt something burning leg lucky enough get out before burned able finish race Ni-Cap does three things 1 prevents shorting 2 eliminates rolling glow plug igniter syndrome 3 keeps plug end clean foreign objects Ni-Cap orange plastic cap molded tether has loop end slips over shank glow plug igniter tether prevents losing cap also serves prevent glow plug igniter rolling off top field box landing dirt have word caution igniter use cap tether sticking out right angles shank igniter make sure facing away prop Should want buy Ni-Cap contact Ernst Manufacturing Inc 37396 Ruben Lane Sandy OR 97055 phone 503 668-5597 usually end up column wishing safe month now believe safe month dont feed body parts through rotating prop D Jumpin Geo/Hunton Continued page 19 four-pitch propeller keep airspeed down vertical capability up Models turn tightly produce considerable G-forces high speeds youll need exercise good sense Fun-fly model design entering golden age Most innovative aircraft use 0S 32 engine Jumpin Geo weve climbed 45 power yet still kept within three-pound wall Geo flies slowly unbelievably tightly also penetrates winds macho style airplane bridges gap between ubiquitous traditional Ugly Stick types delicate new-generation modelsthe sort usually employ least some high-tech materials purposely marginal design As fliers learn use capabilities Jumpin Geo its siblings will opening new chapter sport RC Aerobatics information about specialized fun-fly models have look Jerry Smiths built-up design December 1990 RC Report see Dan Stevenss hollowed-foam wing design February 1991 issue same magazine articles also provide good reference options building Jumpin Geo model really something else fly Its responsiveness will amaze its first contest FARM fun fly near Warrenton Virginia Jumpin Geo placed first time takeoff climb 15 seconds spot landing first Fast-Slow first takeoff number loops 30 seconds Geo unlikely excel AFTER YOU DID ALL THE WORK WHY LET YOUR AIRPLANE DO ALL THE FLYING INFO $500 AWARDED Grand Champion Reserve Grand Champion Ultralight 1989 Sun-N-Fun Fly-In BUILD & FLY THE miniMAX YOURSELF o Computer Designedr3 Axis Control o Part 103 Ultralight Easy Construction Wood Construction TEAM INC BOX 338M BRADY VILLE TN 37026 615 765-5397 November 1991 93 Spend less time buildin& mare tn Sheets available ONLY iu Thre ailable 1/16 x 12 x 35 Stock #6650 3/32x 12x 35- Stock #6651 1/8 x 12 x 35 Stock #6652 PMID PRODULru iIC 4shma Htff44tl994Z-1134 a199tMltPdUt5COlftC1 #5-91-153 Electric F ight Llghtweiglt 12 00money bark Adjustable switching point Soldertess terminal ror easy bookap $2 gna ee ON/OFF Controller995 Mare Powe sa ewe gh 20 Size 22xt3x63 el1trenry anty 006V loss Add S1 ohippio3 Clifoois araidonls add 725% 12 17 Tao Send Check money order Comes sith//High Sky Fntabaoranartrr3929 Kansas St #9 other Cosrectors orer.2. flA 92104 olso availableSan uuun beauty contest otherwise its probably unmatched Jumpin Geo puts whole new perspective RC flying makes fun-flying challenge again Build yourselfand enjoy0 Show Begin/Iden Continued page 25 Circlemaster AST Sussex Wisconsin Safety number have show teams performing before hundreds thousands people safety primary Sometimes lessons learned away show practice field pretty 4-scale Sig Cub shown photos belonged note past tense yours truly Cub yet fly air show offing little yellow OS 40 four-cyclepowered ship favorites made some 30 flights cartwheeled several times nasty crosswinds before two successful takeoffs during slow roll wings suddenly snapped right center model streamed straight hard drought-baked ground two wing panels fluttered earth drove home safety lesson Check aircraft thoroughly after seemingly minor toss-around checked wings various other important parts after cartwheels appeared order Struts secure points landing gear unscathed tail section solid no flex wings etc taken time remove wings cabin however examined center section would have found fractureprobably very smallin front center section cabin stress wires attach front wing fuselage Thats structural failure apparently occurred Its Satisfaction Guaranteedi EAYHINI 5H-710 Pkg 24 $2 95 THE HIGH-TECH HINGE DESIGNED FOR THE CYANOACRYLATE AGE Easier install other hinge No gouging picking messy epoxies Simply cut single knife slot hinge slide hinges place apply few drops favorite CA glue youre done SUPER FAST SUPER EASY SUPER STRONG 7de ee4 fo e4a MFG CO INC.401-7 So Front St.Montezuma IA 50171 623-5154 PRODUCTS FOR THE DISCERNING MODELER Complete Line Exhaust Systems * Tuned Pipes Muffled Tuned Pipes * Headers * Venturi Mufflers * Expansion Mufflers copter Ball Mufflers ialized Exhaust Systems Unsurpassel W,ki,n Drfomanc 94 Model Aviation TAKE THE HOBBY SHOP HOME WITH YOUM THE 15th ANNUAL RADIO CONTROL BUYERS GUIDE ts reference gutde oIl R/C hobbies Browse through guide find items need ond youll know just whot ask favorite hobby shop RADIO CONTROL BUYERS GUIDE lets turn wish list o shopping list knowing whats ovoilable con plan new projects improve existing projects Price informotion olso helps add up just whot plons will cost Look RADIO CONTROL BUYERS GUIDE local hobby shop call 800 533-6644 order ccc... eeceoccc ceoceec c eeecec eec Jo order send Dept X0419 RADIO CONTROL BUYERS GUIDE PO Box 1612 WaukeshaWI 53187-1612 YES Id like order _____ RADIO CONTROL BUYERS GUIDES #13002 $ ______ J Payment enclosed J Charge account Please print Name_________________________________________________ Street______________________________________________________[v33][b22911249163110790]] City State Zip__________________________________________________ Country_____________________________________________________[v33][b24421331183111470]] Charge Li Mastercard Li Visa Li American Express mm $15 Card#_________________________ Exp Date_____________ Signature Include tar postage handling US 3300 canadian tareign add 18% minimum $400 Wisconsin residents add 5% sales tas canadian araers add 7% GST ta tatal Price availability sublect ta change Payable US tunds Dept X0479
Edition: Model Aviation - 1991/11
Page Numbers: 12, 13, 14, 15, 16, 17, 18, 19, 93, 94
I Above Using geodesics lightness coupled torsional strength Jumpin Geo puts whole new perspective compe tition fun-flying makes challenge again As fliers learn use performance capabilities design Its siblings will open new chapter sport RC Aerobatics Below K&B 45 engine spinning Rev-Up 11 x 4 prop produces over three pounds static thrust giving Geo full vertical capability Maneuvers incredibly close-In tight Put good 45 glow engine 3-lb RCer start blowing away competition fun-fly events EJohn Hunton U Bill Winter TO EXCEL fun-fly events model must able maneuver quickly tightly about axes means must weigh very little have low wing loading Jumpin Geo excels fun-flying points new direction RC airplanes designed such events Overall performance maneuverability incredibleunlike anything ever seen RC model Maneuvers remarkably close-in tightloops rolls take about secondand turns unbelievably quick plane has full vertical capability achieve desired lightness sacrificing strength used geodesics torsional rigidity flying surfaces fuselage eliminates need usual D-tube sheet leading edge Also since front wing nonstructural can cut out fuel tank Taking advantage lack emphasis high velocities fun-fly events designed economical structure considerable thickness flying surfaces interdependent spaceframe like members produce extremely light structure still allows full range speed flight Because lightness coupled elevator aileron/flaps model can also flown remarkably slowly Jumpin Geo weighs close three pounds built care uses 40 45 engine K&B sport 45 swinging Rev-Up 11 x 4 propeller produces well over three pounds static thrust giving spectacular vertical performance Take off point airplane up will reach sky Construction Since very lightweight models require simplified structures theyre relatively fast easy build can save few ounces using optional rolled sheet leading edges flying surfaces substitute relatively soft x -in rounded balsa youre using rolled sheet its good idea begin preforming surfaces November 1991 13 Vertical performance impressive model takes off couple feet has known sprint unexpectedly air during taxiing models can take straight up rolling author highly competitive Tun tiler traces its design roots such CL novations HA Thomass coupled flap/elevator concept Stunt models introduced 1947 Huntons may geodesic fun-fly RC will hold together full bore Left rolied tube ol son Vie sneet Daisa used leading edges movable surfaces fin stabilizer ne sneets wetted formed successively around -in %-ln dowels wing leading edge also 1A sheet molded broomstick single step Sections made wrapping wetted sheet around form elastic bandage Right wing ribs can stack sawn full-length ribs installed bias interrupted ribs other Start center work toward tip Special construction features Build wing leading edge fairing soaking two-inch wide strip /16 medium-soft balsa strip rolling around broomstick Soak strip hot water least hour tape end side broomstick Wrap balsa around broomstick Ace bandage Allow assembly thoroughly dry leaving warm place overnight Remove bandage have nicely formed leading edge fairing Use 36-in-long hardwood dowels 3A-in two %-in diameter leading edges other flying surfaces Soak 1-in strip soft /16 balsa wrap around 3A-in dowel allow assembly dry overnight Remove balsa soak again wrap around pair %-in dowels glued together Roll another strip 3A-in dowel repeat two-step procedure balsa cracks use softer strips next time Make enough leading edge material entire model plus reserve Lone Star Models 1623 57th St Lubbock TX 79412 excellent balsa supplier following order will provide almost everything need 26 sheets A6 x 3-in selected soft 6-9 lb/cu ft selecting costs additional 15% two sheets /8 x 4-in selected soft four sheets /16 x 4-in unselected 12 sheets sq eight 4 x also unselected Youre provided surplus select Youll also need some A-in-thick plywood firewall other thicknesses aileron/flap servo mechanism wing skid shear plates Go through balsa own selecting Holding sheet up bare light bulb allows its characteristics come shining through Save wood straightest clearest grain rolling leading edges use rest ribs Wing Building geodesic wing looks lot challenging Its interesting task really difficult jigsaw band saw available stack saw ribs cut few extra ribs parts youll have hand easy repairs Battle damage tends limited structure lightweight Cut wing ribs half Begin building either top bottom wing half flat board pin full-length ribs direction fill partial ribs other direction 14 Model Aviation wing spars constant cross section variable density accommodate differing structural loads Firm wood used center section wIth soft wood tip xx INzK w t wing half built flat board over plan installing ribs cen ter outward prevents compounding errors wing center section spar webbing Bias balsa filler installed center bay help distribute flight loads between top bottom spars Left Note sculptural quality completed wing half second half can built directly stop first pinning latter down spar bracing up trailing edge Right aileron/flaps elevator rudder identical cross section use same ribs diagonals diagonal bracing greatly improves torsional stiffness Ultralight rolled balsa leading edges can used NO OCR TEXT Full-Size Plans Available. Page 196 I/B H I/H FIRM BALSW. DIAGONAL RIB HORNR ERR HGEUNE- ~INRO06 SREE I/AG 3/B H1 RD BALSAI/lB H I/Z~ I/lB H 3/B HORARTS HINGE POINTS______ 1/16 0 I/O TRIM RIB FOR I/lB SHEET TOP AND BOTTOMI IN ROLLED 1/16 IN SHEET SLOT FOR FIN POST I/HO DETAIL / / / AV SEE STABILIZER ELEVATORFOf II II1/40 3/B HARD BALSA POST IIORNOPP II BS 1 IADO BOUNDAN BOB N PO I-BE ORE N ALLN 1iACOT OUT WING EL TANK I r FOR BOOBBASA BHR H SGNOERONS FIBEWALL TEMPBALANCE POINT TORE COLAR-1 I/B IN WIREOPTIONAL SSF~ iOPTIONALLONG NOSEMINI -SEHVI FORBATTERY/RECEIVERBIBS BALSA I/lW WIRESPIDER MOUNTTRROT IN BOTTOMBOO 3/30 BALSA 50 PP OR TBASSWOODBROD GUIDERIBS 1kB FIN 6000 STAB ELEUAILEBOBS FOR KWH 45 SPOBYSTERI I II 47/A RNB 0006I--I- TEMP RD ELEWOR B 0 SHEE J UMPIN G EO DESIGNED AND GRAWI JOHN HONTON199 would lead cumulative errors Instead start center work toward tip errors begin creep just make sure keep ribs absolutely parallel plan position eventually theyll work out Except otherwise noted use medium-density balsa Since variations will occur balsa put advantage using harder ribs middle softer ones toward tips Use CyA cyanoacrylate glue assembly except another adhesive specified wing spars laminated different densities balsa hard wood middle lighter density tips wood should selected carefully Join spar pairs Install spar trailing edge surface sheet rib assembly remove building board Youll note assembly already has high torsional strength Strength bending however poor Pin down completed wing half spar brace up trailing edge build second half over first Install remaiaing ribs second spar trailing edge piece Reinforce center bay wing spar layer bias-grained balsa bias balsasheets /I6 balsa glued together grain opposite 45 B angles material very light yet provides good diagonal stiffness rigidity Add diagonal spar bracing Add trailing edge vertical sheet rolled leading edge Shave necessary ribs add center section sheet Build up tips Fit A6 skid shear plates under wings Cover sheets spar area lightweight fiberglass CyA Drill install %2-ID brass tubes Coat tubes rib intersection baking soda CyA Block sand wing using large sanding block Take care overdo sanding ribs between joints Check reglue open joints Add about oz weight left tip counteract offset weight engine cylinder muffler may have adjust amount later Build remaining flying surfaces Pin down leading edge add true ribs trailing edge Fit diagonals assembly flat bench diagonal members cut same basic shape 16 Model Aviation CI CUT TO ViA VI CLEAR LI \TAHW2J NO BIAS BALSA PRE- FORMED WITH TWO LAYERS I/lB BALSA WITH GRAIN 45 OPPOSITE DIRECTICNS\, stabilizer elevator under construc tion stab fin built up -inthick ribs root sections reinforced firm solid balsa stub spars fuselage sides made bias balsa sheets 1A balsa glued together grain opposite 450 angles Half weight Lite Ply good strength sheets preassembled slow-setting cyanoacrylate installed fuse lage frame trimmed Full-Size Plans Available Page 196 WA ~--flMA A4 BAII ORII II GRAM INITIAL CONTROL TRROWS RODDER Z5 ELECATOR DO AILERON 20 FLAP ADDS 15 W RE SPACE CONTROLS SEROD INSTALLATION LAPAORDER ____ W AXJX FRAME I/B LITEPLO ERS-/S LITEPLY AD C KEEPERS I/S LITEPLO SHUTTLE 3/SD AIRCRAFT PLF AADRORT MOONTRA S55 SRDRT MOONS 6-3D SCREWS NOTCH WIRE5/32 IE RRASS TORE LIGHTENIND ROLESCREW I/A PLYWOODSOLDER LAD WIRE WRAPSILOER SOLDER I/S M W3/3D M LITEWEIGHT WREEL SHORT MDANT -LSNS NDSE FIRED WREEL OPTION WIND SKID DETAIL FORMED LE DETAIL FOR TAIL AILERONS MATER LINE IJUMPIN GEo DE SIDNED AND DRAWN JOHN RANTDN1991 complicating factor otherwise straightforward wing construction sanding aileron/flap tips Build tips flat bench Sand top surfaces proper thickness bring surfaces alignment rest structure bottom surfaces tips will sweep upward giving appearance being warped Place flat area top apparentiy warped area bottom addition producing tapered tips irregularity creates certain amount washout upright wing improves stall characteristics stabilizer rudder built -in-deep ribs diagonals Fuselage Builders options either fuselage long nose short mount short fuselage spider mount spider mount permits installation simple lightweight steerable nose wheel See Flying section viewpoint opinions Begin fuselage construction building up bias-grained sheets A6 stock ouflined wing construction section using slow-cure thick CyA Select hard straight-grained wood longerons Soak four longerons hot water Pin down over plans add uprights note temporary verticals Allow assembly dry overnight remove hom board Add top bottom crosspieces Install firewall 6-32 blind nuts place engine mounting Cover fuselage bias-grained sheeting front A-in sheeting toward rear Round fuselage corners carving sanding Cut openings wing-fuselage joint As final step before assembly add baking soda fillets fortified CyA inside nose area Landing gear system Jumpin Geo uses combination nose wheel wing skids Although saves weight makes very poor taxiing characteristics low speed Taxi grass extreme care nose wheel/wing skid system does give excellent performance high ground speeds means can plant model having stall landing touchdown great touch-andgoes over line skids literally grab grass can keep power steer confidence pull up go again will could add wheels skids small weight penalty Tailor Geo way youll flying competition Covering Cover surfaces using lightest material practical used transparent MonoKote prototype since seems lighter solid-colored variety first prototype covered single color November 1991 17 fuselage sides built directly atop other sake accuracy Use waxed pa per over plan betwen sides prevent unwanted adhesion photographic purposes easy quick orientation however its good idea put large identifying color swatches top bottom cover top bottom different colors second prototype covered Micafilm lighter weight MonoKote Cut covering material mating surfaces assemble parts Use baking soda fillets CyA such critical areas wing stab installations Since wing removable hinge ailerons until wing installation has completed Complete hinging installation epoxy install control horns Final assembly Install round four-ounce fuel tank front fuselage/wing area Cut disc plastic top margarine container cover fuel tank hole firewall Drill disc engine mount holes fuel lines Seal plastic firewall silicone sealant Install radio control gear directly through top fuselage linkages will exposed routed interior fuselage Note directions optional coupled aileron/flap elevator Stack receiver battery wrap thin foam Measure assembly size RC box Build box 3/ balsa cut opening fuselage top sheeting just behind wing spar 18 Model Aviation fuselage side frames ready covered bias-grained balsa Bias balsa provides good diagonal stIffness rIgIdIty adding little weight Full-Size Plans Available Page 196 NOTE- DIAGONAL RIBS ARE SPLIT ON TB S INE DIAGONAL RIBS 6 REOUBEG I/IS BALSA I/B H /6 FIRN BALSA BR -IL 1/16 SHEOT TOP N BOTTOM THIS AREA L FOB FOEL TANS 0 AGONA RIB \KN RIB CAT CENTER TWO BIBS TO FIT BETWEEN DIAGONALSIS BEOGIBED I/IS BALSA I/A 3/B BALSAHINGE UNE ST-IN 1/16 BALSAWINOT P DE AlL CORER W/GAGSOH 3/32 DASS TGBE TBOE SELECTED HARDHARDRI B I/A SO SPARS~SGFT -A--- SOFT N ROLLED I/IS ISGFT FILL JUMPIN GEO DESGNEG AND DRAWN JOAN HANTON 1991 Cut openings rudder elevator servos top RC box choose optional coupled flaperon/elevator function youll also need cut hole aileron servo coupled aileron/flaps-elevator aileron servo slides shuttle actuated elevator servo ailerons move opposition elevator increased lift elevator moves up elevator servo pulls aileron servo aft droop flaps elevator moves down flaps raised Use 14-in -sq members mount servos positioning across fuselage under top sheeting Predrill holes servo screws prepare holes CyA Build up aileron servo shuttle track install fuselage Cut opening throttle servo Install servos have super transmitter may want use spoiler function servo wing rather coupled aileron/flaps-elevator function single servo Install front wheel side skids engine K&B Spider mount offers simple lightweight steerable nose wheel option point provided youve thinking light model should weigh ready go slightly over three pounds K&B 45 engine spinning 11 x 4 Rev-Up propeller recommended power setup Carefully check center-of-gravity Later balance point can incrementally moved rearward desired control response Begin slowly using recommended control throws build up gradually much control motion can handle Hying As mentioned model will fly successfully either fixed steerable nose wheel use spider-type mount does prototype steerable nose wheel can added little additional weight fixed nose wheel Jumpin Geo can steered using elevator keep nose light using prop blast over rudder make turn Its important practice repeatedly before taxiing out around people planes taxi too fast model will take off prematurely Any model design has built-in structural limitations Jumpin Geo dont use full control stick deflections flying fast want turn tight slow down first loops turns actually tighter start relatively slowly Use Continued page 93 November 1991 19 MATCH OTHER SHE 1/6 author bolts K&B 45 engine K&B spider mount permits installation lightweight steerable nose wheel Exposed BC gear gasp Gec sacrifices frills lightness aileron servo mounted shuttle actuated elevator servo coupled aileron/flapselevator function say about product call Ernst Ni-Cap protective cover fits brands Ni Cd glow plug igniters thousands other modelers have time another dropped glow plug igniters dirt have watched roll off table have put pockets have short out against keys some other metal object short out pocket few years ago after started Pylon Racer pitched air About five laps race felt something burning leg lucky enough get out before burned able finish race Ni-Cap does three things 1 prevents shorting 2 eliminates rolling glow plug igniter syndrome 3 keeps plug end clean foreign objects Ni-Cap orange plastic cap molded tether has loop end slips over shank glow plug igniter tether prevents losing cap also serves prevent glow plug igniter rolling off top field box landing dirt have word caution igniter use cap tether sticking out right angles shank igniter make sure facing away prop Should want buy Ni-Cap contact Ernst Manufacturing Inc 37396 Ruben Lane Sandy OR 97055 phone 503 668-5597 usually end up column wishing safe month now believe safe month dont feed body parts through rotating prop D Jumpin Geo/Hunton Continued page 19 four-pitch propeller keep airspeed down vertical capability up Models turn tightly produce considerable G-forces high speeds youll need exercise good sense Fun-fly model design entering golden age Most innovative aircraft use 0S 32 engine Jumpin Geo weve climbed 45 power yet still kept within three-pound wall Geo flies slowly unbelievably tightly also penetrates winds macho style airplane bridges gap between ubiquitous traditional Ugly Stick types delicate new-generation modelsthe sort usually employ least some high-tech materials purposely marginal design As fliers learn use capabilities Jumpin Geo its siblings will opening new chapter sport RC Aerobatics information about specialized fun-fly models have look Jerry Smiths built-up design December 1990 RC Report see Dan Stevenss hollowed-foam wing design February 1991 issue same magazine articles also provide good reference options building Jumpin Geo model really something else fly Its responsiveness will amaze its first contest FARM fun fly near Warrenton Virginia Jumpin Geo placed first time takeoff climb 15 seconds spot landing first Fast-Slow first takeoff number loops 30 seconds Geo unlikely excel AFTER YOU DID ALL THE WORK WHY LET YOUR AIRPLANE DO ALL THE FLYING INFO $500 AWARDED Grand Champion Reserve Grand Champion Ultralight 1989 Sun-N-Fun Fly-In BUILD & FLY THE miniMAX YOURSELF o Computer Designedr3 Axis Control o Part 103 Ultralight Easy Construction Wood Construction TEAM INC BOX 338M BRADY VILLE TN 37026 615 765-5397 November 1991 93 Spend less time buildin& mare tn Sheets available ONLY iu Thre ailable 1/16 x 12 x 35 Stock #6650 3/32x 12x 35- Stock #6651 1/8 x 12 x 35 Stock #6652 PMID PRODULru iIC 4shma Htff44tl994Z-1134 a199tMltPdUt5COlftC1 #5-91-153 Electric F ight Llghtweiglt 12 00money bark Adjustable switching point Soldertess terminal ror easy bookap $2 gna ee ON/OFF Controller995 Mare Powe sa ewe gh 20 Size 22xt3x63 el1trenry anty 006V loss Add S1 ohippio3 Clifoois araidonls add 725% 12 17 Tao Send Check money order Comes sith//High Sky Fntabaoranartrr3929 Kansas St #9 other Cosrectors orer.2. flA 92104 olso availableSan uuun beauty contest otherwise its probably unmatched Jumpin Geo puts whole new perspective RC flying makes fun-flying challenge again Build yourselfand enjoy0 Show Begin/Iden Continued page 25 Circlemaster AST Sussex Wisconsin Safety number have show teams performing before hundreds thousands people safety primary Sometimes lessons learned away show practice field pretty 4-scale Sig Cub shown photos belonged note past tense yours truly Cub yet fly air show offing little yellow OS 40 four-cyclepowered ship favorites made some 30 flights cartwheeled several times nasty crosswinds before two successful takeoffs during slow roll wings suddenly snapped right center model streamed straight hard drought-baked ground two wing panels fluttered earth drove home safety lesson Check aircraft thoroughly after seemingly minor toss-around checked wings various other important parts after cartwheels appeared order Struts secure points landing gear unscathed tail section solid no flex wings etc taken time remove wings cabin however examined center section would have found fractureprobably very smallin front center section cabin stress wires attach front wing fuselage Thats structural failure apparently occurred Its Satisfaction Guaranteedi EAYHINI 5H-710 Pkg 24 $2 95 THE HIGH-TECH HINGE DESIGNED FOR THE CYANOACRYLATE AGE Easier install other hinge No gouging picking messy epoxies Simply cut single knife slot hinge slide hinges place apply few drops favorite CA glue youre done SUPER FAST SUPER EASY SUPER STRONG 7de ee4 fo e4a MFG CO INC.401-7 So Front St.Montezuma IA 50171 623-5154 PRODUCTS FOR THE DISCERNING MODELER Complete Line Exhaust Systems * Tuned Pipes Muffled Tuned Pipes * Headers * Venturi Mufflers * Expansion Mufflers copter Ball Mufflers ialized Exhaust Systems Unsurpassel W,ki,n Drfomanc 94 Model Aviation TAKE THE HOBBY SHOP HOME WITH YOUM THE 15th ANNUAL RADIO CONTROL BUYERS GUIDE ts reference gutde oIl R/C hobbies Browse through guide find items need ond youll know just whot ask favorite hobby shop RADIO CONTROL BUYERS GUIDE lets turn wish list o shopping list knowing whats ovoilable con plan new projects improve existing projects Price informotion olso helps add up just whot plons will cost Look RADIO CONTROL BUYERS GUIDE local hobby shop call 800 533-6644 order ccc... eeceoccc ceoceec c eeecec eec Jo order send Dept X0419 RADIO CONTROL BUYERS GUIDE PO Box 1612 WaukeshaWI 53187-1612 YES Id like order _____ RADIO CONTROL BUYERS GUIDES #13002 $ ______ J Payment enclosed J Charge account Please print Name_________________________________________________ Street______________________________________________________[v33][b22911249163110790]] City State Zip__________________________________________________ Country_____________________________________________________[v33][b24421331183111470]] Charge Li Mastercard Li Visa Li American Express mm $15 Card#_________________________ Exp Date_____________ Signature Include tar postage handling US 3300 canadian tareign add 18% minimum $400 Wisconsin residents add 5% sales tas canadian araers add 7% GST ta tatal Price availability sublect ta change Payable US tunds Dept X0479
Edition: Model Aviation - 1991/11
Page Numbers: 12, 13, 14, 15, 16, 17, 18, 19, 93, 94
I Above Using geodesics lightness coupled torsional strength Jumpin Geo puts whole new perspective compe tition fun-flying makes challenge again As fliers learn use performance capabilities design Its siblings will open new chapter sport RC Aerobatics Below K&B 45 engine spinning Rev-Up 11 x 4 prop produces over three pounds static thrust giving Geo full vertical capability Maneuvers incredibly close-In tight Put good 45 glow engine 3-lb RCer start blowing away competition fun-fly events EJohn Hunton U Bill Winter TO EXCEL fun-fly events model must able maneuver quickly tightly about axes means must weigh very little have low wing loading Jumpin Geo excels fun-flying points new direction RC airplanes designed such events Overall performance maneuverability incredibleunlike anything ever seen RC model Maneuvers remarkably close-in tightloops rolls take about secondand turns unbelievably quick plane has full vertical capability achieve desired lightness sacrificing strength used geodesics torsional rigidity flying surfaces fuselage eliminates need usual D-tube sheet leading edge Also since front wing nonstructural can cut out fuel tank Taking advantage lack emphasis high velocities fun-fly events designed economical structure considerable thickness flying surfaces interdependent spaceframe like members produce extremely light structure still allows full range speed flight Because lightness coupled elevator aileron/flaps model can also flown remarkably slowly Jumpin Geo weighs close three pounds built care uses 40 45 engine K&B sport 45 swinging Rev-Up 11 x 4 propeller produces well over three pounds static thrust giving spectacular vertical performance Take off point airplane up will reach sky Construction Since very lightweight models require simplified structures theyre relatively fast easy build can save few ounces using optional rolled sheet leading edges flying surfaces substitute relatively soft x -in rounded balsa youre using rolled sheet its good idea begin preforming surfaces November 1991 13 Vertical performance impressive model takes off couple feet has known sprint unexpectedly air during taxiing models can take straight up rolling author highly competitive Tun tiler traces its design roots such CL novations HA Thomass coupled flap/elevator concept Stunt models introduced 1947 Huntons may geodesic fun-fly RC will hold together full bore Left rolied tube ol son Vie sneet Daisa used leading edges movable surfaces fin stabilizer ne sneets wetted formed successively around -in %-ln dowels wing leading edge also 1A sheet molded broomstick single step Sections made wrapping wetted sheet around form elastic bandage Right wing ribs can stack sawn full-length ribs installed bias interrupted ribs other Start center work toward tip Special construction features Build wing leading edge fairing soaking two-inch wide strip /16 medium-soft balsa strip rolling around broomstick Soak strip hot water least hour tape end side broomstick Wrap balsa around broomstick Ace bandage Allow assembly thoroughly dry leaving warm place overnight Remove bandage have nicely formed leading edge fairing Use 36-in-long hardwood dowels 3A-in two %-in diameter leading edges other flying surfaces Soak 1-in strip soft /16 balsa wrap around 3A-in dowel allow assembly dry overnight Remove balsa soak again wrap around pair %-in dowels glued together Roll another strip 3A-in dowel repeat two-step procedure balsa cracks use softer strips next time Make enough leading edge material entire model plus reserve Lone Star Models 1623 57th St Lubbock TX 79412 excellent balsa supplier following order will provide almost everything need 26 sheets A6 x 3-in selected soft 6-9 lb/cu ft selecting costs additional 15% two sheets /8 x 4-in selected soft four sheets /16 x 4-in unselected 12 sheets sq eight 4 x also unselected Youre provided surplus select Youll also need some A-in-thick plywood firewall other thicknesses aileron/flap servo mechanism wing skid shear plates Go through balsa own selecting Holding sheet up bare light bulb allows its characteristics come shining through Save wood straightest clearest grain rolling leading edges use rest ribs Wing Building geodesic wing looks lot challenging Its interesting task really difficult jigsaw band saw available stack saw ribs cut few extra ribs parts youll have hand easy repairs Battle damage tends limited structure lightweight Cut wing ribs half Begin building either top bottom wing half flat board pin full-length ribs direction fill partial ribs other direction 14 Model Aviation wing spars constant cross section variable density accommodate differing structural loads Firm wood used center section wIth soft wood tip xx INzK w t wing half built flat board over plan installing ribs cen ter outward prevents compounding errors wing center section spar webbing Bias balsa filler installed center bay help distribute flight loads between top bottom spars Left Note sculptural quality completed wing half second half can built directly stop first pinning latter down spar bracing up trailing edge Right aileron/flaps elevator rudder identical cross section use same ribs diagonals diagonal bracing greatly improves torsional stiffness Ultralight rolled balsa leading edges can used NO OCR TEXT Full-Size Plans Available. Page 196 I/B H I/H FIRM BALSW. DIAGONAL RIB HORNR ERR HGEUNE- ~INRO06 SREE I/AG 3/B H1 RD BALSAI/lB H I/Z~ I/lB H 3/B HORARTS HINGE POINTS______ 1/16 0 I/O TRIM RIB FOR I/lB SHEET TOP AND BOTTOMI IN ROLLED 1/16 IN SHEET SLOT FOR FIN POST I/HO DETAIL / / / AV SEE STABILIZER ELEVATORFOf II II1/40 3/B HARD BALSA POST IIORNOPP II BS 1 IADO BOUNDAN BOB N PO I-BE ORE N ALLN 1iACOT OUT WING EL TANK I r FOR BOOBBASA BHR H SGNOERONS FIBEWALL TEMPBALANCE POINT TORE COLAR-1 I/B IN WIREOPTIONAL SSF~ iOPTIONALLONG NOSEMINI -SEHVI FORBATTERY/RECEIVERBIBS BALSA I/lW WIRESPIDER MOUNTTRROT IN BOTTOMBOO 3/30 BALSA 50 PP OR TBASSWOODBROD GUIDERIBS 1kB FIN 6000 STAB ELEUAILEBOBS FOR KWH 45 SPOBYSTERI I II 47/A RNB 0006I--I- TEMP RD ELEWOR B 0 SHEE J UMPIN G EO DESIGNED AND GRAWI JOHN HONTON199 would lead cumulative errors Instead start center work toward tip errors begin creep just make sure keep ribs absolutely parallel plan position eventually theyll work out Except otherwise noted use medium-density balsa Since variations will occur balsa put advantage using harder ribs middle softer ones toward tips Use CyA cyanoacrylate glue assembly except another adhesive specified wing spars laminated different densities balsa hard wood middle lighter density tips wood should selected carefully Join spar pairs Install spar trailing edge surface sheet rib assembly remove building board Youll note assembly already has high torsional strength Strength bending however poor Pin down completed wing half spar brace up trailing edge build second half over first Install remaiaing ribs second spar trailing edge piece Reinforce center bay wing spar layer bias-grained balsa bias balsasheets /I6 balsa glued together grain opposite 45 B angles material very light yet provides good diagonal stiffness rigidity Add diagonal spar bracing Add trailing edge vertical sheet rolled leading edge Shave necessary ribs add center section sheet Build up tips Fit A6 skid shear plates under wings Cover sheets spar area lightweight fiberglass CyA Drill install %2-ID brass tubes Coat tubes rib intersection baking soda CyA Block sand wing using large sanding block Take care overdo sanding ribs between joints Check reglue open joints Add about oz weight left tip counteract offset weight engine cylinder muffler may have adjust amount later Build remaining flying surfaces Pin down leading edge add true ribs trailing edge Fit diagonals assembly flat bench diagonal members cut same basic shape 16 Model Aviation CI CUT TO ViA VI CLEAR LI \TAHW2J NO BIAS BALSA PRE- FORMED WITH TWO LAYERS I/lB BALSA WITH GRAIN 45 OPPOSITE DIRECTICNS\, stabilizer elevator under construc tion stab fin built up -inthick ribs root sections reinforced firm solid balsa stub spars fuselage sides made bias balsa sheets 1A balsa glued together grain opposite 450 angles Half weight Lite Ply good strength sheets preassembled slow-setting cyanoacrylate installed fuse lage frame trimmed Full-Size Plans Available Page 196 WA ~--flMA A4 BAII ORII II GRAM INITIAL CONTROL TRROWS RODDER Z5 ELECATOR DO AILERON 20 FLAP ADDS 15 W RE SPACE CONTROLS SEROD INSTALLATION LAPAORDER ____ W AXJX FRAME I/B LITEPLO ERS-/S LITEPLY AD C KEEPERS I/S LITEPLO SHUTTLE 3/SD AIRCRAFT PLF AADRORT MOONTRA S55 SRDRT MOONS 6-3D SCREWS NOTCH WIRE5/32 IE RRASS TORE LIGHTENIND ROLESCREW I/A PLYWOODSOLDER LAD WIRE WRAPSILOER SOLDER I/S M W3/3D M LITEWEIGHT WREEL SHORT MDANT -LSNS NDSE FIRED WREEL OPTION WIND SKID DETAIL FORMED LE DETAIL FOR TAIL AILERONS MATER LINE IJUMPIN GEo DE SIDNED AND DRAWN JOHN RANTDN1991 complicating factor otherwise straightforward wing construction sanding aileron/flap tips Build tips flat bench Sand top surfaces proper thickness bring surfaces alignment rest structure bottom surfaces tips will sweep upward giving appearance being warped Place flat area top apparentiy warped area bottom addition producing tapered tips irregularity creates certain amount washout upright wing improves stall characteristics stabilizer rudder built -in-deep ribs diagonals Fuselage Builders options either fuselage long nose short mount short fuselage spider mount spider mount permits installation simple lightweight steerable nose wheel See Flying section viewpoint opinions Begin fuselage construction building up bias-grained sheets A6 stock ouflined wing construction section using slow-cure thick CyA Select hard straight-grained wood longerons Soak four longerons hot water Pin down over plans add uprights note temporary verticals Allow assembly dry overnight remove hom board Add top bottom crosspieces Install firewall 6-32 blind nuts place engine mounting Cover fuselage bias-grained sheeting front A-in sheeting toward rear Round fuselage corners carving sanding Cut openings wing-fuselage joint As final step before assembly add baking soda fillets fortified CyA inside nose area Landing gear system Jumpin Geo uses combination nose wheel wing skids Although saves weight makes very poor taxiing characteristics low speed Taxi grass extreme care nose wheel/wing skid system does give excellent performance high ground speeds means can plant model having stall landing touchdown great touch-andgoes over line skids literally grab grass can keep power steer confidence pull up go again will could add wheels skids small weight penalty Tailor Geo way youll flying competition Covering Cover surfaces using lightest material practical used transparent MonoKote prototype since seems lighter solid-colored variety first prototype covered single color November 1991 17 fuselage sides built directly atop other sake accuracy Use waxed pa per over plan betwen sides prevent unwanted adhesion photographic purposes easy quick orientation however its good idea put large identifying color swatches top bottom cover top bottom different colors second prototype covered Micafilm lighter weight MonoKote Cut covering material mating surfaces assemble parts Use baking soda fillets CyA such critical areas wing stab installations Since wing removable hinge ailerons until wing installation has completed Complete hinging installation epoxy install control horns Final assembly Install round four-ounce fuel tank front fuselage/wing area Cut disc plastic top margarine container cover fuel tank hole firewall Drill disc engine mount holes fuel lines Seal plastic firewall silicone sealant Install radio control gear directly through top fuselage linkages will exposed routed interior fuselage Note directions optional coupled aileron/flap elevator Stack receiver battery wrap thin foam Measure assembly size RC box Build box 3/ balsa cut opening fuselage top sheeting just behind wing spar 18 Model Aviation fuselage side frames ready covered bias-grained balsa Bias balsa provides good diagonal stIffness rIgIdIty adding little weight Full-Size Plans Available Page 196 NOTE- DIAGONAL RIBS ARE SPLIT ON TB S INE DIAGONAL RIBS 6 REOUBEG I/IS BALSA I/B H /6 FIRN BALSA BR -IL 1/16 SHEOT TOP N BOTTOM THIS AREA L FOB FOEL TANS 0 AGONA RIB \KN RIB CAT CENTER TWO BIBS TO FIT BETWEEN DIAGONALSIS BEOGIBED I/IS BALSA I/A 3/B BALSAHINGE UNE ST-IN 1/16 BALSAWINOT P DE AlL CORER W/GAGSOH 3/32 DASS TGBE TBOE SELECTED HARDHARDRI B I/A SO SPARS~SGFT -A--- SOFT N ROLLED I/IS ISGFT FILL JUMPIN GEO DESGNEG AND DRAWN JOAN HANTON 1991 Cut openings rudder elevator servos top RC box choose optional coupled flaperon/elevator function youll also need cut hole aileron servo coupled aileron/flaps-elevator aileron servo slides shuttle actuated elevator servo ailerons move opposition elevator increased lift elevator moves up elevator servo pulls aileron servo aft droop flaps elevator moves down flaps raised Use 14-in -sq members mount servos positioning across fuselage under top sheeting Predrill holes servo screws prepare holes CyA Build up aileron servo shuttle track install fuselage Cut opening throttle servo Install servos have super transmitter may want use spoiler function servo wing rather coupled aileron/flaps-elevator function single servo Install front wheel side skids engine K&B Spider mount offers simple lightweight steerable nose wheel option point provided youve thinking light model should weigh ready go slightly over three pounds K&B 45 engine spinning 11 x 4 Rev-Up propeller recommended power setup Carefully check center-of-gravity Later balance point can incrementally moved rearward desired control response Begin slowly using recommended control throws build up gradually much control motion can handle Hying As mentioned model will fly successfully either fixed steerable nose wheel use spider-type mount does prototype steerable nose wheel can added little additional weight fixed nose wheel Jumpin Geo can steered using elevator keep nose light using prop blast over rudder make turn Its important practice repeatedly before taxiing out around people planes taxi too fast model will take off prematurely Any model design has built-in structural limitations Jumpin Geo dont use full control stick deflections flying fast want turn tight slow down first loops turns actually tighter start relatively slowly Use Continued page 93 November 1991 19 MATCH OTHER SHE 1/6 author bolts K&B 45 engine K&B spider mount permits installation lightweight steerable nose wheel Exposed BC gear gasp Gec sacrifices frills lightness aileron servo mounted shuttle actuated elevator servo coupled aileron/flapselevator function say about product call Ernst Ni-Cap protective cover fits brands Ni Cd glow plug igniters thousands other modelers have time another dropped glow plug igniters dirt have watched roll off table have put pockets have short out against keys some other metal object short out pocket few years ago after started Pylon Racer pitched air About five laps race felt something burning leg lucky enough get out before burned able finish race Ni-Cap does three things 1 prevents shorting 2 eliminates rolling glow plug igniter syndrome 3 keeps plug end clean foreign objects Ni-Cap orange plastic cap molded tether has loop end slips over shank glow plug igniter tether prevents losing cap also serves prevent glow plug igniter rolling off top field box landing dirt have word caution igniter use cap tether sticking out right angles shank igniter make sure facing away prop Should want buy Ni-Cap contact Ernst Manufacturing Inc 37396 Ruben Lane Sandy OR 97055 phone 503 668-5597 usually end up column wishing safe month now believe safe month dont feed body parts through rotating prop D Jumpin Geo/Hunton Continued page 19 four-pitch propeller keep airspeed down vertical capability up Models turn tightly produce considerable G-forces high speeds youll need exercise good sense Fun-fly model design entering golden age Most innovative aircraft use 0S 32 engine Jumpin Geo weve climbed 45 power yet still kept within three-pound wall Geo flies slowly unbelievably tightly also penetrates winds macho style airplane bridges gap between ubiquitous traditional Ugly Stick types delicate new-generation modelsthe sort usually employ least some high-tech materials purposely marginal design As fliers learn use capabilities Jumpin Geo its siblings will opening new chapter sport RC Aerobatics information about specialized fun-fly models have look Jerry Smiths built-up design December 1990 RC Report see Dan Stevenss hollowed-foam wing design February 1991 issue same magazine articles also provide good reference options building Jumpin Geo model really something else fly Its responsiveness will amaze its first contest FARM fun fly near Warrenton Virginia Jumpin Geo placed first time takeoff climb 15 seconds spot landing first Fast-Slow first takeoff number loops 30 seconds Geo unlikely excel AFTER YOU DID ALL THE WORK WHY LET YOUR AIRPLANE DO ALL THE FLYING INFO $500 AWARDED Grand Champion Reserve Grand Champion Ultralight 1989 Sun-N-Fun Fly-In BUILD & FLY THE miniMAX YOURSELF o Computer Designedr3 Axis Control o Part 103 Ultralight Easy Construction Wood Construction TEAM INC BOX 338M BRADY VILLE TN 37026 615 765-5397 November 1991 93 Spend less time buildin& mare tn Sheets available ONLY iu Thre ailable 1/16 x 12 x 35 Stock #6650 3/32x 12x 35- Stock #6651 1/8 x 12 x 35 Stock #6652 PMID PRODULru iIC 4shma Htff44tl994Z-1134 a199tMltPdUt5COlftC1 #5-91-153 Electric F ight Llghtweiglt 12 00money bark Adjustable switching point Soldertess terminal ror easy bookap $2 gna ee ON/OFF Controller995 Mare Powe sa ewe gh 20 Size 22xt3x63 el1trenry anty 006V loss Add S1 ohippio3 Clifoois araidonls add 725% 12 17 Tao Send Check money order Comes sith//High Sky Fntabaoranartrr3929 Kansas St #9 other Cosrectors orer.2. flA 92104 olso availableSan uuun beauty contest otherwise its probably unmatched Jumpin Geo puts whole new perspective RC flying makes fun-flying challenge again Build yourselfand enjoy0 Show Begin/Iden Continued page 25 Circlemaster AST Sussex Wisconsin Safety number have show teams performing before hundreds thousands people safety primary Sometimes lessons learned away show practice field pretty 4-scale Sig Cub shown photos belonged note past tense yours truly Cub yet fly air show offing little yellow OS 40 four-cyclepowered ship favorites made some 30 flights cartwheeled several times nasty crosswinds before two successful takeoffs during slow roll wings suddenly snapped right center model streamed straight hard drought-baked ground two wing panels fluttered earth drove home safety lesson Check aircraft thoroughly after seemingly minor toss-around checked wings various other important parts after cartwheels appeared order Struts secure points landing gear unscathed tail section solid no flex wings etc taken time remove wings cabin however examined center section would have found fractureprobably very smallin front center section cabin stress wires attach front wing fuselage Thats structural failure apparently occurred Its Satisfaction Guaranteedi EAYHINI 5H-710 Pkg 24 $2 95 THE HIGH-TECH HINGE DESIGNED FOR THE CYANOACRYLATE AGE Easier install other hinge No gouging picking messy epoxies Simply cut single knife slot hinge slide hinges place apply few drops favorite CA glue youre done SUPER FAST SUPER EASY SUPER STRONG 7de ee4 fo e4a MFG CO INC.401-7 So Front St.Montezuma IA 50171 623-5154 PRODUCTS FOR THE DISCERNING MODELER Complete Line Exhaust Systems * Tuned Pipes Muffled Tuned Pipes * Headers * Venturi Mufflers * Expansion Mufflers copter Ball Mufflers ialized Exhaust Systems Unsurpassel W,ki,n Drfomanc 94 Model Aviation TAKE THE HOBBY SHOP HOME WITH YOUM THE 15th ANNUAL RADIO CONTROL BUYERS GUIDE ts reference gutde oIl R/C hobbies Browse through guide find items need ond youll know just whot ask favorite hobby shop RADIO CONTROL BUYERS GUIDE lets turn wish list o shopping list knowing whats ovoilable con plan new projects improve existing projects Price informotion olso helps add up just whot plons will cost Look RADIO CONTROL BUYERS GUIDE local hobby shop call 800 533-6644 order ccc... eeceoccc ceoceec c eeecec eec Jo order send Dept X0419 RADIO CONTROL BUYERS GUIDE PO Box 1612 WaukeshaWI 53187-1612 YES Id like order _____ RADIO CONTROL BUYERS GUIDES #13002 $ ______ J Payment enclosed J Charge account Please print Name_________________________________________________ Street______________________________________________________[v33][b22911249163110790]] City State Zip__________________________________________________ Country_____________________________________________________[v33][b24421331183111470]] Charge Li Mastercard Li Visa Li American Express mm $15 Card#_________________________ Exp Date_____________ Signature Include tar postage handling US 3300 canadian tareign add 18% minimum $400 Wisconsin residents add 5% sales tas canadian araers add 7% GST ta tatal Price availability sublect ta change Payable US tunds Dept X0479
Edition: Model Aviation - 1991/11
Page Numbers: 12, 13, 14, 15, 16, 17, 18, 19, 93, 94
I Above Using geodesics lightness coupled torsional strength Jumpin Geo puts whole new perspective compe tition fun-flying makes challenge again As fliers learn use performance capabilities design Its siblings will open new chapter sport RC Aerobatics Below K&B 45 engine spinning Rev-Up 11 x 4 prop produces over three pounds static thrust giving Geo full vertical capability Maneuvers incredibly close-In tight Put good 45 glow engine 3-lb RCer start blowing away competition fun-fly events EJohn Hunton U Bill Winter TO EXCEL fun-fly events model must able maneuver quickly tightly about axes means must weigh very little have low wing loading Jumpin Geo excels fun-flying points new direction RC airplanes designed such events Overall performance maneuverability incredibleunlike anything ever seen RC model Maneuvers remarkably close-in tightloops rolls take about secondand turns unbelievably quick plane has full vertical capability achieve desired lightness sacrificing strength used geodesics torsional rigidity flying surfaces fuselage eliminates need usual D-tube sheet leading edge Also since front wing nonstructural can cut out fuel tank Taking advantage lack emphasis high velocities fun-fly events designed economical structure considerable thickness flying surfaces interdependent spaceframe like members produce extremely light structure still allows full range speed flight Because lightness coupled elevator aileron/flaps model can also flown remarkably slowly Jumpin Geo weighs close three pounds built care uses 40 45 engine K&B sport 45 swinging Rev-Up 11 x 4 propeller produces well over three pounds static thrust giving spectacular vertical performance Take off point airplane up will reach sky Construction Since very lightweight models require simplified structures theyre relatively fast easy build can save few ounces using optional rolled sheet leading edges flying surfaces substitute relatively soft x -in rounded balsa youre using rolled sheet its good idea begin preforming surfaces November 1991 13 Vertical performance impressive model takes off couple feet has known sprint unexpectedly air during taxiing models can take straight up rolling author highly competitive Tun tiler traces its design roots such CL novations HA Thomass coupled flap/elevator concept Stunt models introduced 1947 Huntons may geodesic fun-fly RC will hold together full bore Left rolied tube ol son Vie sneet Daisa used leading edges movable surfaces fin stabilizer ne sneets wetted formed successively around -in %-ln dowels wing leading edge also 1A sheet molded broomstick single step Sections made wrapping wetted sheet around form elastic bandage Right wing ribs can stack sawn full-length ribs installed bias interrupted ribs other Start center work toward tip Special construction features Build wing leading edge fairing soaking two-inch wide strip /16 medium-soft balsa strip rolling around broomstick Soak strip hot water least hour tape end side broomstick Wrap balsa around broomstick Ace bandage Allow assembly thoroughly dry leaving warm place overnight Remove bandage have nicely formed leading edge fairing Use 36-in-long hardwood dowels 3A-in two %-in diameter leading edges other flying surfaces Soak 1-in strip soft /16 balsa wrap around 3A-in dowel allow assembly dry overnight Remove balsa soak again wrap around pair %-in dowels glued together Roll another strip 3A-in dowel repeat two-step procedure balsa cracks use softer strips next time Make enough leading edge material entire model plus reserve Lone Star Models 1623 57th St Lubbock TX 79412 excellent balsa supplier following order will provide almost everything need 26 sheets A6 x 3-in selected soft 6-9 lb/cu ft selecting costs additional 15% two sheets /8 x 4-in selected soft four sheets /16 x 4-in unselected 12 sheets sq eight 4 x also unselected Youre provided surplus select Youll also need some A-in-thick plywood firewall other thicknesses aileron/flap servo mechanism wing skid shear plates Go through balsa own selecting Holding sheet up bare light bulb allows its characteristics come shining through Save wood straightest clearest grain rolling leading edges use rest ribs Wing Building geodesic wing looks lot challenging Its interesting task really difficult jigsaw band saw available stack saw ribs cut few extra ribs parts youll have hand easy repairs Battle damage tends limited structure lightweight Cut wing ribs half Begin building either top bottom wing half flat board pin full-length ribs direction fill partial ribs other direction 14 Model Aviation wing spars constant cross section variable density accommodate differing structural loads Firm wood used center section wIth soft wood tip xx INzK w t wing half built flat board over plan installing ribs cen ter outward prevents compounding errors wing center section spar webbing Bias balsa filler installed center bay help distribute flight loads between top bottom spars Left Note sculptural quality completed wing half second half can built directly stop first pinning latter down spar bracing up trailing edge Right aileron/flaps elevator rudder identical cross section use same ribs diagonals diagonal bracing greatly improves torsional stiffness Ultralight rolled balsa leading edges can used NO OCR TEXT Full-Size Plans Available. Page 196 I/B H I/H FIRM BALSW. DIAGONAL RIB HORNR ERR HGEUNE- ~INRO06 SREE I/AG 3/B H1 RD BALSAI/lB H I/Z~ I/lB H 3/B HORARTS HINGE POINTS______ 1/16 0 I/O TRIM RIB FOR I/lB SHEET TOP AND BOTTOMI IN ROLLED 1/16 IN SHEET SLOT FOR FIN POST I/HO DETAIL / / / AV SEE STABILIZER ELEVATORFOf II II1/40 3/B HARD BALSA POST IIORNOPP II BS 1 IADO BOUNDAN BOB N PO I-BE ORE N ALLN 1iACOT OUT WING EL TANK I r FOR BOOBBASA BHR H SGNOERONS FIBEWALL TEMPBALANCE POINT TORE COLAR-1 I/B IN WIREOPTIONAL SSF~ iOPTIONALLONG NOSEMINI -SEHVI FORBATTERY/RECEIVERBIBS BALSA I/lW WIRESPIDER MOUNTTRROT IN BOTTOMBOO 3/30 BALSA 50 PP OR TBASSWOODBROD GUIDERIBS 1kB FIN 6000 STAB ELEUAILEBOBS FOR KWH 45 SPOBYSTERI I II 47/A RNB 0006I--I- TEMP RD ELEWOR B 0 SHEE J UMPIN G EO DESIGNED AND GRAWI JOHN HONTON199 would lead cumulative errors Instead start center work toward tip errors begin creep just make sure keep ribs absolutely parallel plan position eventually theyll work out Except otherwise noted use medium-density balsa Since variations will occur balsa put advantage using harder ribs middle softer ones toward tips Use CyA cyanoacrylate glue assembly except another adhesive specified wing spars laminated different densities balsa hard wood middle lighter density tips wood should selected carefully Join spar pairs Install spar trailing edge surface sheet rib assembly remove building board Youll note assembly already has high torsional strength Strength bending however poor Pin down completed wing half spar brace up trailing edge build second half over first Install remaiaing ribs second spar trailing edge piece Reinforce center bay wing spar layer bias-grained balsa bias balsasheets /I6 balsa glued together grain opposite 45 B angles material very light yet provides good diagonal stiffness rigidity Add diagonal spar bracing Add trailing edge vertical sheet rolled leading edge Shave necessary ribs add center section sheet Build up tips Fit A6 skid shear plates under wings Cover sheets spar area lightweight fiberglass CyA Drill install %2-ID brass tubes Coat tubes rib intersection baking soda CyA Block sand wing using large sanding block Take care overdo sanding ribs between joints Check reglue open joints Add about oz weight left tip counteract offset weight engine cylinder muffler may have adjust amount later Build remaining flying surfaces Pin down leading edge add true ribs trailing edge Fit diagonals assembly flat bench diagonal members cut same basic shape 16 Model Aviation CI CUT TO ViA VI CLEAR LI \TAHW2J NO BIAS BALSA PRE- FORMED WITH TWO LAYERS I/lB BALSA WITH GRAIN 45 OPPOSITE DIRECTICNS\, stabilizer elevator under construc tion stab fin built up -inthick ribs root sections reinforced firm solid balsa stub spars fuselage sides made bias balsa sheets 1A balsa glued together grain opposite 450 angles Half weight Lite Ply good strength sheets preassembled slow-setting cyanoacrylate installed fuse lage frame trimmed Full-Size Plans Available Page 196 WA ~--flMA A4 BAII ORII II GRAM INITIAL CONTROL TRROWS RODDER Z5 ELECATOR DO AILERON 20 FLAP ADDS 15 W RE SPACE CONTROLS SEROD INSTALLATION LAPAORDER ____ W AXJX FRAME I/B LITEPLO ERS-/S LITEPLY AD C KEEPERS I/S LITEPLO SHUTTLE 3/SD AIRCRAFT PLF AADRORT MOONTRA S55 SRDRT MOONS 6-3D SCREWS NOTCH WIRE5/32 IE RRASS TORE LIGHTENIND ROLESCREW I/A PLYWOODSOLDER LAD WIRE WRAPSILOER SOLDER I/S M W3/3D M LITEWEIGHT WREEL SHORT MDANT -LSNS NDSE FIRED WREEL OPTION WIND SKID DETAIL FORMED LE DETAIL FOR TAIL AILERONS MATER LINE IJUMPIN GEo DE SIDNED AND DRAWN JOHN RANTDN1991 complicating factor otherwise straightforward wing construction sanding aileron/flap tips Build tips flat bench Sand top surfaces proper thickness bring surfaces alignment rest structure bottom surfaces tips will sweep upward giving appearance being warped Place flat area top apparentiy warped area bottom addition producing tapered tips irregularity creates certain amount washout upright wing improves stall characteristics stabilizer rudder built -in-deep ribs diagonals Fuselage Builders options either fuselage long nose short mount short fuselage spider mount spider mount permits installation simple lightweight steerable nose wheel See Flying section viewpoint opinions Begin fuselage construction building up bias-grained sheets A6 stock ouflined wing construction section using slow-cure thick CyA Select hard straight-grained wood longerons Soak four longerons hot water Pin down over plans add uprights note temporary verticals Allow assembly dry overnight remove hom board Add top bottom crosspieces Install firewall 6-32 blind nuts place engine mounting Cover fuselage bias-grained sheeting front A-in sheeting toward rear Round fuselage corners carving sanding Cut openings wing-fuselage joint As final step before assembly add baking soda fillets fortified CyA inside nose area Landing gear system Jumpin Geo uses combination nose wheel wing skids Although saves weight makes very poor taxiing characteristics low speed Taxi grass extreme care nose wheel/wing skid system does give excellent performance high ground speeds means can plant model having stall landing touchdown great touch-andgoes over line skids literally grab grass can keep power steer confidence pull up go again will could add wheels skids small weight penalty Tailor Geo way youll flying competition Covering Cover surfaces using lightest material practical used transparent MonoKote prototype since seems lighter solid-colored variety first prototype covered single color November 1991 17 fuselage sides built directly atop other sake accuracy Use waxed pa per over plan betwen sides prevent unwanted adhesion photographic purposes easy quick orientation however its good idea put large identifying color swatches top bottom cover top bottom different colors second prototype covered Micafilm lighter weight MonoKote Cut covering material mating surfaces assemble parts Use baking soda fillets CyA such critical areas wing stab installations Since wing removable hinge ailerons until wing installation has completed Complete hinging installation epoxy install control horns Final assembly Install round four-ounce fuel tank front fuselage/wing area Cut disc plastic top margarine container cover fuel tank hole firewall Drill disc engine mount holes fuel lines Seal plastic firewall silicone sealant Install radio control gear directly through top fuselage linkages will exposed routed interior fuselage Note directions optional coupled aileron/flap elevator Stack receiver battery wrap thin foam Measure assembly size RC box Build box 3/ balsa cut opening fuselage top sheeting just behind wing spar 18 Model Aviation fuselage side frames ready covered bias-grained balsa Bias balsa provides good diagonal stIffness rIgIdIty adding little weight Full-Size Plans Available Page 196 NOTE- DIAGONAL RIBS ARE SPLIT ON TB S INE DIAGONAL RIBS 6 REOUBEG I/IS BALSA I/B H /6 FIRN BALSA BR -IL 1/16 SHEOT TOP N BOTTOM THIS AREA L FOB FOEL TANS 0 AGONA RIB \KN RIB CAT CENTER TWO BIBS TO FIT BETWEEN DIAGONALSIS BEOGIBED I/IS BALSA I/A 3/B BALSAHINGE UNE ST-IN 1/16 BALSAWINOT P DE AlL CORER W/GAGSOH 3/32 DASS TGBE TBOE SELECTED HARDHARDRI B I/A SO SPARS~SGFT -A--- SOFT N ROLLED I/IS ISGFT FILL JUMPIN GEO DESGNEG AND DRAWN JOAN HANTON 1991 Cut openings rudder elevator servos top RC box choose optional coupled flaperon/elevator function youll also need cut hole aileron servo coupled aileron/flaps-elevator aileron servo slides shuttle actuated elevator servo ailerons move opposition elevator increased lift elevator moves up elevator servo pulls aileron servo aft droop flaps elevator moves down flaps raised Use 14-in -sq members mount servos positioning across fuselage under top sheeting Predrill holes servo screws prepare holes CyA Build up aileron servo shuttle track install fuselage Cut opening throttle servo Install servos have super transmitter may want use spoiler function servo wing rather coupled aileron/flaps-elevator function single servo Install front wheel side skids engine K&B Spider mount offers simple lightweight steerable nose wheel option point provided youve thinking light model should weigh ready go slightly over three pounds K&B 45 engine spinning 11 x 4 Rev-Up propeller recommended power setup Carefully check center-of-gravity Later balance point can incrementally moved rearward desired control response Begin slowly using recommended control throws build up gradually much control motion can handle Hying As mentioned model will fly successfully either fixed steerable nose wheel use spider-type mount does prototype steerable nose wheel can added little additional weight fixed nose wheel Jumpin Geo can steered using elevator keep nose light using prop blast over rudder make turn Its important practice repeatedly before taxiing out around people planes taxi too fast model will take off prematurely Any model design has built-in structural limitations Jumpin Geo dont use full control stick deflections flying fast want turn tight slow down first loops turns actually tighter start relatively slowly Use Continued page 93 November 1991 19 MATCH OTHER SHE 1/6 author bolts K&B 45 engine K&B spider mount permits installation lightweight steerable nose wheel Exposed BC gear gasp Gec sacrifices frills lightness aileron servo mounted shuttle actuated elevator servo coupled aileron/flapselevator function say about product call Ernst Ni-Cap protective cover fits brands Ni Cd glow plug igniters thousands other modelers have time another dropped glow plug igniters dirt have watched roll off table have put pockets have short out against keys some other metal object short out pocket few years ago after started Pylon Racer pitched air About five laps race felt something burning leg lucky enough get out before burned able finish race Ni-Cap does three things 1 prevents shorting 2 eliminates rolling glow plug igniter syndrome 3 keeps plug end clean foreign objects Ni-Cap orange plastic cap molded tether has loop end slips over shank glow plug igniter tether prevents losing cap also serves prevent glow plug igniter rolling off top field box landing dirt have word caution igniter use cap tether sticking out right angles shank igniter make sure facing away prop Should want buy Ni-Cap contact Ernst Manufacturing Inc 37396 Ruben Lane Sandy OR 97055 phone 503 668-5597 usually end up column wishing safe month now believe safe month dont feed body parts through rotating prop D Jumpin Geo/Hunton Continued page 19 four-pitch propeller keep airspeed down vertical capability up Models turn tightly produce considerable G-forces high speeds youll need exercise good sense Fun-fly model design entering golden age Most innovative aircraft use 0S 32 engine Jumpin Geo weve climbed 45 power yet still kept within three-pound wall Geo flies slowly unbelievably tightly also penetrates winds macho style airplane bridges gap between ubiquitous traditional Ugly Stick types delicate new-generation modelsthe sort usually employ least some high-tech materials purposely marginal design As fliers learn use capabilities Jumpin Geo its siblings will opening new chapter sport RC Aerobatics information about specialized fun-fly models have look Jerry Smiths built-up design December 1990 RC Report see Dan Stevenss hollowed-foam wing design February 1991 issue same magazine articles also provide good reference options building Jumpin Geo model really something else fly Its responsiveness will amaze its first contest FARM fun fly near Warrenton Virginia Jumpin Geo placed first time takeoff climb 15 seconds spot landing first Fast-Slow first takeoff number loops 30 seconds Geo unlikely excel AFTER YOU DID ALL THE WORK WHY LET YOUR AIRPLANE DO ALL THE FLYING INFO $500 AWARDED Grand Champion Reserve Grand Champion Ultralight 1989 Sun-N-Fun Fly-In BUILD & FLY THE miniMAX YOURSELF o Computer Designedr3 Axis Control o Part 103 Ultralight Easy Construction Wood Construction TEAM INC BOX 338M BRADY VILLE TN 37026 615 765-5397 November 1991 93 Spend less time buildin& mare tn Sheets available ONLY iu Thre ailable 1/16 x 12 x 35 Stock #6650 3/32x 12x 35- Stock #6651 1/8 x 12 x 35 Stock #6652 PMID PRODULru iIC 4shma Htff44tl994Z-1134 a199tMltPdUt5COlftC1 #5-91-153 Electric F ight Llghtweiglt 12 00money bark Adjustable switching point Soldertess terminal ror easy bookap $2 gna ee ON/OFF Controller995 Mare Powe sa ewe gh 20 Size 22xt3x63 el1trenry anty 006V loss Add S1 ohippio3 Clifoois araidonls add 725% 12 17 Tao Send Check money order Comes sith//High Sky Fntabaoranartrr3929 Kansas St #9 other Cosrectors orer.2. flA 92104 olso availableSan uuun beauty contest otherwise its probably unmatched Jumpin Geo puts whole new perspective RC flying makes fun-flying challenge again Build yourselfand enjoy0 Show Begin/Iden Continued page 25 Circlemaster AST Sussex Wisconsin Safety number have show teams performing before hundreds thousands people safety primary Sometimes lessons learned away show practice field pretty 4-scale Sig Cub shown photos belonged note past tense yours truly Cub yet fly air show offing little yellow OS 40 four-cyclepowered ship favorites made some 30 flights cartwheeled several times nasty crosswinds before two successful takeoffs during slow roll wings suddenly snapped right center model streamed straight hard drought-baked ground two wing panels fluttered earth drove home safety lesson Check aircraft thoroughly after seemingly minor toss-around checked wings various other important parts after cartwheels appeared order Struts secure points landing gear unscathed tail section solid no flex wings etc taken time remove wings cabin however examined center section would have found fractureprobably very smallin front center section cabin stress wires attach front wing fuselage Thats structural failure apparently occurred Its Satisfaction Guaranteedi EAYHINI 5H-710 Pkg 24 $2 95 THE HIGH-TECH HINGE DESIGNED FOR THE CYANOACRYLATE AGE Easier install other hinge No gouging picking messy epoxies Simply cut single knife slot hinge slide hinges place apply few drops favorite CA glue youre done SUPER FAST SUPER EASY SUPER STRONG 7de ee4 fo e4a MFG CO INC.401-7 So Front St.Montezuma IA 50171 623-5154 PRODUCTS FOR THE DISCERNING MODELER Complete Line Exhaust Systems * Tuned Pipes Muffled Tuned Pipes * Headers * Venturi Mufflers * Expansion Mufflers copter Ball Mufflers ialized Exhaust Systems Unsurpassel W,ki,n Drfomanc 94 Model Aviation TAKE THE HOBBY SHOP HOME WITH YOUM THE 15th ANNUAL RADIO CONTROL BUYERS GUIDE ts reference gutde oIl R/C hobbies Browse through guide find items need ond youll know just whot ask favorite hobby shop RADIO CONTROL BUYERS GUIDE lets turn wish list o shopping list knowing whats ovoilable con plan new projects improve existing projects Price informotion olso helps add up just whot plons will cost Look RADIO CONTROL BUYERS GUIDE local hobby shop call 800 533-6644 order ccc... eeceoccc ceoceec c eeecec eec Jo order send Dept X0419 RADIO CONTROL BUYERS GUIDE PO Box 1612 WaukeshaWI 53187-1612 YES Id like order _____ RADIO CONTROL BUYERS GUIDES #13002 $ ______ J Payment enclosed J Charge account Please print Name_________________________________________________ Street______________________________________________________[v33][b22911249163110790]] City State Zip__________________________________________________ Country_____________________________________________________[v33][b24421331183111470]] Charge Li Mastercard Li Visa Li American Express mm $15 Card#_________________________ Exp Date_____________ Signature Include tar postage handling US 3300 canadian tareign add 18% minimum $400 Wisconsin residents add 5% sales tas canadian araers add 7% GST ta tatal Price availability sublect ta change Payable US tunds Dept X0479
Edition: Model Aviation - 1991/11
Page Numbers: 12, 13, 14, 15, 16, 17, 18, 19, 93, 94
I Above Using geodesics lightness coupled torsional strength Jumpin Geo puts whole new perspective compe tition fun-flying makes challenge again As fliers learn use performance capabilities design Its siblings will open new chapter sport RC Aerobatics Below K&B 45 engine spinning Rev-Up 11 x 4 prop produces over three pounds static thrust giving Geo full vertical capability Maneuvers incredibly close-In tight Put good 45 glow engine 3-lb RCer start blowing away competition fun-fly events EJohn Hunton U Bill Winter TO EXCEL fun-fly events model must able maneuver quickly tightly about axes means must weigh very little have low wing loading Jumpin Geo excels fun-flying points new direction RC airplanes designed such events Overall performance maneuverability incredibleunlike anything ever seen RC model Maneuvers remarkably close-in tightloops rolls take about secondand turns unbelievably quick plane has full vertical capability achieve desired lightness sacrificing strength used geodesics torsional rigidity flying surfaces fuselage eliminates need usual D-tube sheet leading edge Also since front wing nonstructural can cut out fuel tank Taking advantage lack emphasis high velocities fun-fly events designed economical structure considerable thickness flying surfaces interdependent spaceframe like members produce extremely light structure still allows full range speed flight Because lightness coupled elevator aileron/flaps model can also flown remarkably slowly Jumpin Geo weighs close three pounds built care uses 40 45 engine K&B sport 45 swinging Rev-Up 11 x 4 propeller produces well over three pounds static thrust giving spectacular vertical performance Take off point airplane up will reach sky Construction Since very lightweight models require simplified structures theyre relatively fast easy build can save few ounces using optional rolled sheet leading edges flying surfaces substitute relatively soft x -in rounded balsa youre using rolled sheet its good idea begin preforming surfaces November 1991 13 Vertical performance impressive model takes off couple feet has known sprint unexpectedly air during taxiing models can take straight up rolling author highly competitive Tun tiler traces its design roots such CL novations HA Thomass coupled flap/elevator concept Stunt models introduced 1947 Huntons may geodesic fun-fly RC will hold together full bore Left rolied tube ol son Vie sneet Daisa used leading edges movable surfaces fin stabilizer ne sneets wetted formed successively around -in %-ln dowels wing leading edge also 1A sheet molded broomstick single step Sections made wrapping wetted sheet around form elastic bandage Right wing ribs can stack sawn full-length ribs installed bias interrupted ribs other Start center work toward tip Special construction features Build wing leading edge fairing soaking two-inch wide strip /16 medium-soft balsa strip rolling around broomstick Soak strip hot water least hour tape end side broomstick Wrap balsa around broomstick Ace bandage Allow assembly thoroughly dry leaving warm place overnight Remove bandage have nicely formed leading edge fairing Use 36-in-long hardwood dowels 3A-in two %-in diameter leading edges other flying surfaces Soak 1-in strip soft /16 balsa wrap around 3A-in dowel allow assembly dry overnight Remove balsa soak again wrap around pair %-in dowels glued together Roll another strip 3A-in dowel repeat two-step procedure balsa cracks use softer strips next time Make enough leading edge material entire model plus reserve Lone Star Models 1623 57th St Lubbock TX 79412 excellent balsa supplier following order will provide almost everything need 26 sheets A6 x 3-in selected soft 6-9 lb/cu ft selecting costs additional 15% two sheets /8 x 4-in selected soft four sheets /16 x 4-in unselected 12 sheets sq eight 4 x also unselected Youre provided surplus select Youll also need some A-in-thick plywood firewall other thicknesses aileron/flap servo mechanism wing skid shear plates Go through balsa own selecting Holding sheet up bare light bulb allows its characteristics come shining through Save wood straightest clearest grain rolling leading edges use rest ribs Wing Building geodesic wing looks lot challenging Its interesting task really difficult jigsaw band saw available stack saw ribs cut few extra ribs parts youll have hand easy repairs Battle damage tends limited structure lightweight Cut wing ribs half Begin building either top bottom wing half flat board pin full-length ribs direction fill partial ribs other direction 14 Model Aviation wing spars constant cross section variable density accommodate differing structural loads Firm wood used center section wIth soft wood tip xx INzK w t wing half built flat board over plan installing ribs cen ter outward prevents compounding errors wing center section spar webbing Bias balsa filler installed center bay help distribute flight loads between top bottom spars Left Note sculptural quality completed wing half second half can built directly stop first pinning latter down spar bracing up trailing edge Right aileron/flaps elevator rudder identical cross section use same ribs diagonals diagonal bracing greatly improves torsional stiffness Ultralight rolled balsa leading edges can used NO OCR TEXT Full-Size Plans Available. Page 196 I/B H I/H FIRM BALSW. DIAGONAL RIB HORNR ERR HGEUNE- ~INRO06 SREE I/AG 3/B H1 RD BALSAI/lB H I/Z~ I/lB H 3/B HORARTS HINGE POINTS______ 1/16 0 I/O TRIM RIB FOR I/lB SHEET TOP AND BOTTOMI IN ROLLED 1/16 IN SHEET SLOT FOR FIN POST I/HO DETAIL / / / AV SEE STABILIZER ELEVATORFOf II II1/40 3/B HARD BALSA POST IIORNOPP II BS 1 IADO BOUNDAN BOB N PO I-BE ORE N ALLN 1iACOT OUT WING EL TANK I r FOR BOOBBASA BHR H SGNOERONS FIBEWALL TEMPBALANCE POINT TORE COLAR-1 I/B IN WIREOPTIONAL SSF~ iOPTIONALLONG NOSEMINI -SEHVI FORBATTERY/RECEIVERBIBS BALSA I/lW WIRESPIDER MOUNTTRROT IN BOTTOMBOO 3/30 BALSA 50 PP OR TBASSWOODBROD GUIDERIBS 1kB FIN 6000 STAB ELEUAILEBOBS FOR KWH 45 SPOBYSTERI I II 47/A RNB 0006I--I- TEMP RD ELEWOR B 0 SHEE J UMPIN G EO DESIGNED AND GRAWI JOHN HONTON199 would lead cumulative errors Instead start center work toward tip errors begin creep just make sure keep ribs absolutely parallel plan position eventually theyll work out Except otherwise noted use medium-density balsa Since variations will occur balsa put advantage using harder ribs middle softer ones toward tips Use CyA cyanoacrylate glue assembly except another adhesive specified wing spars laminated different densities balsa hard wood middle lighter density tips wood should selected carefully Join spar pairs Install spar trailing edge surface sheet rib assembly remove building board Youll note assembly already has high torsional strength Strength bending however poor Pin down completed wing half spar brace up trailing edge build second half over first Install remaiaing ribs second spar trailing edge piece Reinforce center bay wing spar layer bias-grained balsa bias balsasheets /I6 balsa glued together grain opposite 45 B angles material very light yet provides good diagonal stiffness rigidity Add diagonal spar bracing Add trailing edge vertical sheet rolled leading edge Shave necessary ribs add center section sheet Build up tips Fit A6 skid shear plates under wings Cover sheets spar area lightweight fiberglass CyA Drill install %2-ID brass tubes Coat tubes rib intersection baking soda CyA Block sand wing using large sanding block Take care overdo sanding ribs between joints Check reglue open joints Add about oz weight left tip counteract offset weight engine cylinder muffler may have adjust amount later Build remaining flying surfaces Pin down leading edge add true ribs trailing edge Fit diagonals assembly flat bench diagonal members cut same basic shape 16 Model Aviation CI CUT TO ViA VI CLEAR LI \TAHW2J NO BIAS BALSA PRE- FORMED WITH TWO LAYERS I/lB BALSA WITH GRAIN 45 OPPOSITE DIRECTICNS\, stabilizer elevator under construc tion stab fin built up -inthick ribs root sections reinforced firm solid balsa stub spars fuselage sides made bias balsa sheets 1A balsa glued together grain opposite 450 angles Half weight Lite Ply good strength sheets preassembled slow-setting cyanoacrylate installed fuse lage frame trimmed Full-Size Plans Available Page 196 WA ~--flMA A4 BAII ORII II GRAM INITIAL CONTROL TRROWS RODDER Z5 ELECATOR DO AILERON 20 FLAP ADDS 15 W RE SPACE CONTROLS SEROD INSTALLATION LAPAORDER ____ W AXJX FRAME I/B LITEPLO ERS-/S LITEPLY AD C KEEPERS I/S LITEPLO SHUTTLE 3/SD AIRCRAFT PLF AADRORT MOONTRA S55 SRDRT MOONS 6-3D SCREWS NOTCH WIRE5/32 IE RRASS TORE LIGHTENIND ROLESCREW I/A PLYWOODSOLDER LAD WIRE WRAPSILOER SOLDER I/S M W3/3D M LITEWEIGHT WREEL SHORT MDANT -LSNS NDSE FIRED WREEL OPTION WIND SKID DETAIL FORMED LE DETAIL FOR TAIL AILERONS MATER LINE IJUMPIN GEo DE SIDNED AND DRAWN JOHN RANTDN1991 complicating factor otherwise straightforward wing construction sanding aileron/flap tips Build tips flat bench Sand top surfaces proper thickness bring surfaces alignment rest structure bottom surfaces tips will sweep upward giving appearance being warped Place flat area top apparentiy warped area bottom addition producing tapered tips irregularity creates certain amount washout upright wing improves stall characteristics stabilizer rudder built -in-deep ribs diagonals Fuselage Builders options either fuselage long nose short mount short fuselage spider mount spider mount permits installation simple lightweight steerable nose wheel See Flying section viewpoint opinions Begin fuselage construction building up bias-grained sheets A6 stock ouflined wing construction section using slow-cure thick CyA Select hard straight-grained wood longerons Soak four longerons hot water Pin down over plans add uprights note temporary verticals Allow assembly dry overnight remove hom board Add top bottom crosspieces Install firewall 6-32 blind nuts place engine mounting Cover fuselage bias-grained sheeting front A-in sheeting toward rear Round fuselage corners carving sanding Cut openings wing-fuselage joint As final step before assembly add baking soda fillets fortified CyA inside nose area Landing gear system Jumpin Geo uses combination nose wheel wing skids Although saves weight makes very poor taxiing characteristics low speed Taxi grass extreme care nose wheel/wing skid system does give excellent performance high ground speeds means can plant model having stall landing touchdown great touch-andgoes over line skids literally grab grass can keep power steer confidence pull up go again will could add wheels skids small weight penalty Tailor Geo way youll flying competition Covering Cover surfaces using lightest material practical used transparent MonoKote prototype since seems lighter solid-colored variety first prototype covered single color November 1991 17 fuselage sides built directly atop other sake accuracy Use waxed pa per over plan betwen sides prevent unwanted adhesion photographic purposes easy quick orientation however its good idea put large identifying color swatches top bottom cover top bottom different colors second prototype covered Micafilm lighter weight MonoKote Cut covering material mating surfaces assemble parts Use baking soda fillets CyA such critical areas wing stab installations Since wing removable hinge ailerons until wing installation has completed Complete hinging installation epoxy install control horns Final assembly Install round four-ounce fuel tank front fuselage/wing area Cut disc plastic top margarine container cover fuel tank hole firewall Drill disc engine mount holes fuel lines Seal plastic firewall silicone sealant Install radio control gear directly through top fuselage linkages will exposed routed interior fuselage Note directions optional coupled aileron/flap elevator Stack receiver battery wrap thin foam Measure assembly size RC box Build box 3/ balsa cut opening fuselage top sheeting just behind wing spar 18 Model Aviation fuselage side frames ready covered bias-grained balsa Bias balsa provides good diagonal stIffness rIgIdIty adding little weight Full-Size Plans Available Page 196 NOTE- DIAGONAL RIBS ARE SPLIT ON TB S INE DIAGONAL RIBS 6 REOUBEG I/IS BALSA I/B H /6 FIRN BALSA BR -IL 1/16 SHEOT TOP N BOTTOM THIS AREA L FOB FOEL TANS 0 AGONA RIB \KN RIB CAT CENTER TWO BIBS TO FIT BETWEEN DIAGONALSIS BEOGIBED I/IS BALSA I/A 3/B BALSAHINGE UNE ST-IN 1/16 BALSAWINOT P DE AlL CORER W/GAGSOH 3/32 DASS TGBE TBOE SELECTED HARDHARDRI B I/A SO SPARS~SGFT -A--- SOFT N ROLLED I/IS ISGFT FILL JUMPIN GEO DESGNEG AND DRAWN JOAN HANTON 1991 Cut openings rudder elevator servos top RC box choose optional coupled flaperon/elevator function youll also need cut hole aileron servo coupled aileron/flaps-elevator aileron servo slides shuttle actuated elevator servo ailerons move opposition elevator increased lift elevator moves up elevator servo pulls aileron servo aft droop flaps elevator moves down flaps raised Use 14-in -sq members mount servos positioning across fuselage under top sheeting Predrill holes servo screws prepare holes CyA Build up aileron servo shuttle track install fuselage Cut opening throttle servo Install servos have super transmitter may want use spoiler function servo wing rather coupled aileron/flaps-elevator function single servo Install front wheel side skids engine K&B Spider mount offers simple lightweight steerable nose wheel option point provided youve thinking light model should weigh ready go slightly over three pounds K&B 45 engine spinning 11 x 4 Rev-Up propeller recommended power setup Carefully check center-of-gravity Later balance point can incrementally moved rearward desired control response Begin slowly using recommended control throws build up gradually much control motion can handle Hying As mentioned model will fly successfully either fixed steerable nose wheel use spider-type mount does prototype steerable nose wheel can added little additional weight fixed nose wheel Jumpin Geo can steered using elevator keep nose light using prop blast over rudder make turn Its important practice repeatedly before taxiing out around people planes taxi too fast model will take off prematurely Any model design has built-in structural limitations Jumpin Geo dont use full control stick deflections flying fast want turn tight slow down first loops turns actually tighter start relatively slowly Use Continued page 93 November 1991 19 MATCH OTHER SHE 1/6 author bolts K&B 45 engine K&B spider mount permits installation lightweight steerable nose wheel Exposed BC gear gasp Gec sacrifices frills lightness aileron servo mounted shuttle actuated elevator servo coupled aileron/flapselevator function say about product call Ernst Ni-Cap protective cover fits brands Ni Cd glow plug igniters thousands other modelers have time another dropped glow plug igniters dirt have watched roll off table have put pockets have short out against keys some other metal object short out pocket few years ago after started Pylon Racer pitched air About five laps race felt something burning leg lucky enough get out before burned able finish race Ni-Cap does three things 1 prevents shorting 2 eliminates rolling glow plug igniter syndrome 3 keeps plug end clean foreign objects Ni-Cap orange plastic cap molded tether has loop end slips over shank glow plug igniter tether prevents losing cap also serves prevent glow plug igniter rolling off top field box landing dirt have word caution igniter use cap tether sticking out right angles shank igniter make sure facing away prop Should want buy Ni-Cap contact Ernst Manufacturing Inc 37396 Ruben Lane Sandy OR 97055 phone 503 668-5597 usually end up column wishing safe month now believe safe month dont feed body parts through rotating prop D Jumpin Geo/Hunton Continued page 19 four-pitch propeller keep airspeed down vertical capability up Models turn tightly produce considerable G-forces high speeds youll need exercise good sense Fun-fly model design entering golden age Most innovative aircraft use 0S 32 engine Jumpin Geo weve climbed 45 power yet still kept within three-pound wall Geo flies slowly unbelievably tightly also penetrates winds macho style airplane bridges gap between ubiquitous traditional Ugly Stick types delicate new-generation modelsthe sort usually employ least some high-tech materials purposely marginal design As fliers learn use capabilities Jumpin Geo its siblings will opening new chapter sport RC Aerobatics information about specialized fun-fly models have look Jerry Smiths built-up design December 1990 RC Report see Dan Stevenss hollowed-foam wing design February 1991 issue same magazine articles also provide good reference options building Jumpin Geo model really something else fly Its responsiveness will amaze its first contest FARM fun fly near Warrenton Virginia Jumpin Geo placed first time takeoff climb 15 seconds spot landing first Fast-Slow first takeoff number loops 30 seconds Geo unlikely excel AFTER YOU DID ALL THE WORK WHY LET YOUR AIRPLANE DO ALL THE FLYING INFO $500 AWARDED Grand Champion Reserve Grand Champion Ultralight 1989 Sun-N-Fun Fly-In BUILD & FLY THE miniMAX YOURSELF o Computer Designedr3 Axis Control o Part 103 Ultralight Easy Construction Wood Construction TEAM INC BOX 338M BRADY VILLE TN 37026 615 765-5397 November 1991 93 Spend less time buildin& mare tn Sheets available ONLY iu Thre ailable 1/16 x 12 x 35 Stock #6650 3/32x 12x 35- Stock #6651 1/8 x 12 x 35 Stock #6652 PMID PRODULru iIC 4shma Htff44tl994Z-1134 a199tMltPdUt5COlftC1 #5-91-153 Electric F ight Llghtweiglt 12 00money bark Adjustable switching point Soldertess terminal ror easy bookap $2 gna ee ON/OFF Controller995 Mare Powe sa ewe gh 20 Size 22xt3x63 el1trenry anty 006V loss Add S1 ohippio3 Clifoois araidonls add 725% 12 17 Tao Send Check money order Comes sith//High Sky Fntabaoranartrr3929 Kansas St #9 other Cosrectors orer.2. flA 92104 olso availableSan uuun beauty contest otherwise its probably unmatched Jumpin Geo puts whole new perspective RC flying makes fun-flying challenge again Build yourselfand enjoy0 Show Begin/Iden Continued page 25 Circlemaster AST Sussex Wisconsin Safety number have show teams performing before hundreds thousands people safety primary Sometimes lessons learned away show practice field pretty 4-scale Sig Cub shown photos belonged note past tense yours truly Cub yet fly air show offing little yellow OS 40 four-cyclepowered ship favorites made some 30 flights cartwheeled several times nasty crosswinds before two successful takeoffs during slow roll wings suddenly snapped right center model streamed straight hard drought-baked ground two wing panels fluttered earth drove home safety lesson Check aircraft thoroughly after seemingly minor toss-around checked wings various other important parts after cartwheels appeared order Struts secure points landing gear unscathed tail section solid no flex wings etc taken time remove wings cabin however examined center section would have found fractureprobably very smallin front center section cabin stress wires attach front wing fuselage Thats structural failure apparently occurred Its Satisfaction Guaranteedi EAYHINI 5H-710 Pkg 24 $2 95 THE HIGH-TECH HINGE DESIGNED FOR THE CYANOACRYLATE AGE Easier install other hinge No gouging picking messy epoxies Simply cut single knife slot hinge slide hinges place apply few drops favorite CA glue youre done SUPER FAST SUPER EASY SUPER STRONG 7de ee4 fo e4a MFG CO INC.401-7 So Front St.Montezuma IA 50171 623-5154 PRODUCTS FOR THE DISCERNING MODELER Complete Line Exhaust Systems * Tuned Pipes Muffled Tuned Pipes * Headers * Venturi Mufflers * Expansion Mufflers copter Ball Mufflers ialized Exhaust Systems Unsurpassel W,ki,n Drfomanc 94 Model Aviation TAKE THE HOBBY SHOP HOME WITH YOUM THE 15th ANNUAL RADIO CONTROL BUYERS GUIDE ts reference gutde oIl R/C hobbies Browse through guide find items need ond youll know just whot ask favorite hobby shop RADIO CONTROL BUYERS GUIDE lets turn wish list o shopping list knowing whats ovoilable con plan new projects improve existing projects Price informotion olso helps add up just whot plons will cost Look RADIO CONTROL BUYERS GUIDE local hobby shop call 800 533-6644 order ccc... eeceoccc ceoceec c eeecec eec Jo order send Dept X0419 RADIO CONTROL BUYERS GUIDE PO Box 1612 WaukeshaWI 53187-1612 YES Id like order _____ RADIO CONTROL BUYERS GUIDES #13002 $ ______ J Payment enclosed J Charge account Please print Name_________________________________________________ Street______________________________________________________[v33][b22911249163110790]] City State Zip__________________________________________________ Country_____________________________________________________[v33][b24421331183111470]] Charge Li Mastercard Li Visa Li American Express mm $15 Card#_________________________ Exp Date_____________ Signature Include tar postage handling US 3300 canadian tareign add 18% minimum $400 Wisconsin residents add 5% sales tas canadian araers add 7% GST ta tatal Price availability sublect ta change Payable US tunds Dept X0479
Edition: Model Aviation - 1991/11
Page Numbers: 12, 13, 14, 15, 16, 17, 18, 19, 93, 94
I Above Using geodesics lightness coupled torsional strength Jumpin Geo puts whole new perspective compe tition fun-flying makes challenge again As fliers learn use performance capabilities design Its siblings will open new chapter sport RC Aerobatics Below K&B 45 engine spinning Rev-Up 11 x 4 prop produces over three pounds static thrust giving Geo full vertical capability Maneuvers incredibly close-In tight Put good 45 glow engine 3-lb RCer start blowing away competition fun-fly events EJohn Hunton U Bill Winter TO EXCEL fun-fly events model must able maneuver quickly tightly about axes means must weigh very little have low wing loading Jumpin Geo excels fun-flying points new direction RC airplanes designed such events Overall performance maneuverability incredibleunlike anything ever seen RC model Maneuvers remarkably close-in tightloops rolls take about secondand turns unbelievably quick plane has full vertical capability achieve desired lightness sacrificing strength used geodesics torsional rigidity flying surfaces fuselage eliminates need usual D-tube sheet leading edge Also since front wing nonstructural can cut out fuel tank Taking advantage lack emphasis high velocities fun-fly events designed economical structure considerable thickness flying surfaces interdependent spaceframe like members produce extremely light structure still allows full range speed flight Because lightness coupled elevator aileron/flaps model can also flown remarkably slowly Jumpin Geo weighs close three pounds built care uses 40 45 engine K&B sport 45 swinging Rev-Up 11 x 4 propeller produces well over three pounds static thrust giving spectacular vertical performance Take off point airplane up will reach sky Construction Since very lightweight models require simplified structures theyre relatively fast easy build can save few ounces using optional rolled sheet leading edges flying surfaces substitute relatively soft x -in rounded balsa youre using rolled sheet its good idea begin preforming surfaces November 1991 13 Vertical performance impressive model takes off couple feet has known sprint unexpectedly air during taxiing models can take straight up rolling author highly competitive Tun tiler traces its design roots such CL novations HA Thomass coupled flap/elevator concept Stunt models introduced 1947 Huntons may geodesic fun-fly RC will hold together full bore Left rolied tube ol son Vie sneet Daisa used leading edges movable surfaces fin stabilizer ne sneets wetted formed successively around -in %-ln dowels wing leading edge also 1A sheet molded broomstick single step Sections made wrapping wetted sheet around form elastic bandage Right wing ribs can stack sawn full-length ribs installed bias interrupted ribs other Start center work toward tip Special construction features Build wing leading edge fairing soaking two-inch wide strip /16 medium-soft balsa strip rolling around broomstick Soak strip hot water least hour tape end side broomstick Wrap balsa around broomstick Ace bandage Allow assembly thoroughly dry leaving warm place overnight Remove bandage have nicely formed leading edge fairing Use 36-in-long hardwood dowels 3A-in two %-in diameter leading edges other flying surfaces Soak 1-in strip soft /16 balsa wrap around 3A-in dowel allow assembly dry overnight Remove balsa soak again wrap around pair %-in dowels glued together Roll another strip 3A-in dowel repeat two-step procedure balsa cracks use softer strips next time Make enough leading edge material entire model plus reserve Lone Star Models 1623 57th St Lubbock TX 79412 excellent balsa supplier following order will provide almost everything need 26 sheets A6 x 3-in selected soft 6-9 lb/cu ft selecting costs additional 15% two sheets /8 x 4-in selected soft four sheets /16 x 4-in unselected 12 sheets sq eight 4 x also unselected Youre provided surplus select Youll also need some A-in-thick plywood firewall other thicknesses aileron/flap servo mechanism wing skid shear plates Go through balsa own selecting Holding sheet up bare light bulb allows its characteristics come shining through Save wood straightest clearest grain rolling leading edges use rest ribs Wing Building geodesic wing looks lot challenging Its interesting task really difficult jigsaw band saw available stack saw ribs cut few extra ribs parts youll have hand easy repairs Battle damage tends limited structure lightweight Cut wing ribs half Begin building either top bottom wing half flat board pin full-length ribs direction fill partial ribs other direction 14 Model Aviation wing spars constant cross section variable density accommodate differing structural loads Firm wood used center section wIth soft wood tip xx INzK w t wing half built flat board over plan installing ribs cen ter outward prevents compounding errors wing center section spar webbing Bias balsa filler installed center bay help distribute flight loads between top bottom spars Left Note sculptural quality completed wing half second half can built directly stop first pinning latter down spar bracing up trailing edge Right aileron/flaps elevator rudder identical cross section use same ribs diagonals diagonal bracing greatly improves torsional stiffness Ultralight rolled balsa leading edges can used NO OCR TEXT Full-Size Plans Available. Page 196 I/B H I/H FIRM BALSW. DIAGONAL RIB HORNR ERR HGEUNE- ~INRO06 SREE I/AG 3/B H1 RD BALSAI/lB H I/Z~ I/lB H 3/B HORARTS HINGE POINTS______ 1/16 0 I/O TRIM RIB FOR I/lB SHEET TOP AND BOTTOMI IN ROLLED 1/16 IN SHEET SLOT FOR FIN POST I/HO DETAIL / / / AV SEE STABILIZER ELEVATORFOf II II1/40 3/B HARD BALSA POST IIORNOPP II BS 1 IADO BOUNDAN BOB N PO I-BE ORE N ALLN 1iACOT OUT WING EL TANK I r FOR BOOBBASA BHR H SGNOERONS FIBEWALL TEMPBALANCE POINT TORE COLAR-1 I/B IN WIREOPTIONAL SSF~ iOPTIONALLONG NOSEMINI -SEHVI FORBATTERY/RECEIVERBIBS BALSA I/lW WIRESPIDER MOUNTTRROT IN BOTTOMBOO 3/30 BALSA 50 PP OR TBASSWOODBROD GUIDERIBS 1kB FIN 6000 STAB ELEUAILEBOBS FOR KWH 45 SPOBYSTERI I II 47/A RNB 0006I--I- TEMP RD ELEWOR B 0 SHEE J UMPIN G EO DESIGNED AND GRAWI JOHN HONTON199 would lead cumulative errors Instead start center work toward tip errors begin creep just make sure keep ribs absolutely parallel plan position eventually theyll work out Except otherwise noted use medium-density balsa Since variations will occur balsa put advantage using harder ribs middle softer ones toward tips Use CyA cyanoacrylate glue assembly except another adhesive specified wing spars laminated different densities balsa hard wood middle lighter density tips wood should selected carefully Join spar pairs Install spar trailing edge surface sheet rib assembly remove building board Youll note assembly already has high torsional strength Strength bending however poor Pin down completed wing half spar brace up trailing edge build second half over first Install remaiaing ribs second spar trailing edge piece Reinforce center bay wing spar layer bias-grained balsa bias balsasheets /I6 balsa glued together grain opposite 45 B angles material very light yet provides good diagonal stiffness rigidity Add diagonal spar bracing Add trailing edge vertical sheet rolled leading edge Shave necessary ribs add center section sheet Build up tips Fit A6 skid shear plates under wings Cover sheets spar area lightweight fiberglass CyA Drill install %2-ID brass tubes Coat tubes rib intersection baking soda CyA Block sand wing using large sanding block Take care overdo sanding ribs between joints Check reglue open joints Add about oz weight left tip counteract offset weight engine cylinder muffler may have adjust amount later Build remaining flying surfaces Pin down leading edge add true ribs trailing edge Fit diagonals assembly flat bench diagonal members cut same basic shape 16 Model Aviation CI CUT TO ViA VI CLEAR LI \TAHW2J NO BIAS BALSA PRE- FORMED WITH TWO LAYERS I/lB BALSA WITH GRAIN 45 OPPOSITE DIRECTICNS\, stabilizer elevator under construc tion stab fin built up -inthick ribs root sections reinforced firm solid balsa stub spars fuselage sides made bias balsa sheets 1A balsa glued together grain opposite 450 angles Half weight Lite Ply good strength sheets preassembled slow-setting cyanoacrylate installed fuse lage frame trimmed Full-Size Plans Available Page 196 WA ~--flMA A4 BAII ORII II GRAM INITIAL CONTROL TRROWS RODDER Z5 ELECATOR DO AILERON 20 FLAP ADDS 15 W RE SPACE CONTROLS SEROD INSTALLATION LAPAORDER ____ W AXJX FRAME I/B LITEPLO ERS-/S LITEPLY AD C KEEPERS I/S LITEPLO SHUTTLE 3/SD AIRCRAFT PLF AADRORT MOONTRA S55 SRDRT MOONS 6-3D SCREWS NOTCH WIRE5/32 IE RRASS TORE LIGHTENIND ROLESCREW I/A PLYWOODSOLDER LAD WIRE WRAPSILOER SOLDER I/S M W3/3D M LITEWEIGHT WREEL SHORT MDANT -LSNS NDSE FIRED WREEL OPTION WIND SKID DETAIL FORMED LE DETAIL FOR TAIL AILERONS MATER LINE IJUMPIN GEo DE SIDNED AND DRAWN JOHN RANTDN1991 complicating factor otherwise straightforward wing construction sanding aileron/flap tips Build tips flat bench Sand top surfaces proper thickness bring surfaces alignment rest structure bottom surfaces tips will sweep upward giving appearance being warped Place flat area top apparentiy warped area bottom addition producing tapered tips irregularity creates certain amount washout upright wing improves stall characteristics stabilizer rudder built -in-deep ribs diagonals Fuselage Builders options either fuselage long nose short mount short fuselage spider mount spider mount permits installation simple lightweight steerable nose wheel See Flying section viewpoint opinions Begin fuselage construction building up bias-grained sheets A6 stock ouflined wing construction section using slow-cure thick CyA Select hard straight-grained wood longerons Soak four longerons hot water Pin down over plans add uprights note temporary verticals Allow assembly dry overnight remove hom board Add top bottom crosspieces Install firewall 6-32 blind nuts place engine mounting Cover fuselage bias-grained sheeting front A-in sheeting toward rear Round fuselage corners carving sanding Cut openings wing-fuselage joint As final step before assembly add baking soda fillets fortified CyA inside nose area Landing gear system Jumpin Geo uses combination nose wheel wing skids Although saves weight makes very poor taxiing characteristics low speed Taxi grass extreme care nose wheel/wing skid system does give excellent performance high ground speeds means can plant model having stall landing touchdown great touch-andgoes over line skids literally grab grass can keep power steer confidence pull up go again will could add wheels skids small weight penalty Tailor Geo way youll flying competition Covering Cover surfaces using lightest material practical used transparent MonoKote prototype since seems lighter solid-colored variety first prototype covered single color November 1991 17 fuselage sides built directly atop other sake accuracy Use waxed pa per over plan betwen sides prevent unwanted adhesion photographic purposes easy quick orientation however its good idea put large identifying color swatches top bottom cover top bottom different colors second prototype covered Micafilm lighter weight MonoKote Cut covering material mating surfaces assemble parts Use baking soda fillets CyA such critical areas wing stab installations Since wing removable hinge ailerons until wing installation has completed Complete hinging installation epoxy install control horns Final assembly Install round four-ounce fuel tank front fuselage/wing area Cut disc plastic top margarine container cover fuel tank hole firewall Drill disc engine mount holes fuel lines Seal plastic firewall silicone sealant Install radio control gear directly through top fuselage linkages will exposed routed interior fuselage Note directions optional coupled aileron/flap elevator Stack receiver battery wrap thin foam Measure assembly size RC box Build box 3/ balsa cut opening fuselage top sheeting just behind wing spar 18 Model Aviation fuselage side frames ready covered bias-grained balsa Bias balsa provides good diagonal stIffness rIgIdIty adding little weight Full-Size Plans Available Page 196 NOTE- DIAGONAL RIBS ARE SPLIT ON TB S INE DIAGONAL RIBS 6 REOUBEG I/IS BALSA I/B H /6 FIRN BALSA BR -IL 1/16 SHEOT TOP N BOTTOM THIS AREA L FOB FOEL TANS 0 AGONA RIB \KN RIB CAT CENTER TWO BIBS TO FIT BETWEEN DIAGONALSIS BEOGIBED I/IS BALSA I/A 3/B BALSAHINGE UNE ST-IN 1/16 BALSAWINOT P DE AlL CORER W/GAGSOH 3/32 DASS TGBE TBOE SELECTED HARDHARDRI B I/A SO SPARS~SGFT -A--- SOFT N ROLLED I/IS ISGFT FILL JUMPIN GEO DESGNEG AND DRAWN JOAN HANTON 1991 Cut openings rudder elevator servos top RC box choose optional coupled flaperon/elevator function youll also need cut hole aileron servo coupled aileron/flaps-elevator aileron servo slides shuttle actuated elevator servo ailerons move opposition elevator increased lift elevator moves up elevator servo pulls aileron servo aft droop flaps elevator moves down flaps raised Use 14-in -sq members mount servos positioning across fuselage under top sheeting Predrill holes servo screws prepare holes CyA Build up aileron servo shuttle track install fuselage Cut opening throttle servo Install servos have super transmitter may want use spoiler function servo wing rather coupled aileron/flaps-elevator function single servo Install front wheel side skids engine K&B Spider mount offers simple lightweight steerable nose wheel option point provided youve thinking light model should weigh ready go slightly over three pounds K&B 45 engine spinning 11 x 4 Rev-Up propeller recommended power setup Carefully check center-of-gravity Later balance point can incrementally moved rearward desired control response Begin slowly using recommended control throws build up gradually much control motion can handle Hying As mentioned model will fly successfully either fixed steerable nose wheel use spider-type mount does prototype steerable nose wheel can added little additional weight fixed nose wheel Jumpin Geo can steered using elevator keep nose light using prop blast over rudder make turn Its important practice repeatedly before taxiing out around people planes taxi too fast model will take off prematurely Any model design has built-in structural limitations Jumpin Geo dont use full control stick deflections flying fast want turn tight slow down first loops turns actually tighter start relatively slowly Use Continued page 93 November 1991 19 MATCH OTHER SHE 1/6 author bolts K&B 45 engine K&B spider mount permits installation lightweight steerable nose wheel Exposed BC gear gasp Gec sacrifices frills lightness aileron servo mounted shuttle actuated elevator servo coupled aileron/flapselevator function say about product call Ernst Ni-Cap protective cover fits brands Ni Cd glow plug igniters thousands other modelers have time another dropped glow plug igniters dirt have watched roll off table have put pockets have short out against keys some other metal object short out pocket few years ago after started Pylon Racer pitched air About five laps race felt something burning leg lucky enough get out before burned able finish race Ni-Cap does three things 1 prevents shorting 2 eliminates rolling glow plug igniter syndrome 3 keeps plug end clean foreign objects Ni-Cap orange plastic cap molded tether has loop end slips over shank glow plug igniter tether prevents losing cap also serves prevent glow plug igniter rolling off top field box landing dirt have word caution igniter use cap tether sticking out right angles shank igniter make sure facing away prop Should want buy Ni-Cap contact Ernst Manufacturing Inc 37396 Ruben Lane Sandy OR 97055 phone 503 668-5597 usually end up column wishing safe month now believe safe month dont feed body parts through rotating prop D Jumpin Geo/Hunton Continued page 19 four-pitch propeller keep airspeed down vertical capability up Models turn tightly produce considerable G-forces high speeds youll need exercise good sense Fun-fly model design entering golden age Most innovative aircraft use 0S 32 engine Jumpin Geo weve climbed 45 power yet still kept within three-pound wall Geo flies slowly unbelievably tightly also penetrates winds macho style airplane bridges gap between ubiquitous traditional Ugly Stick types delicate new-generation modelsthe sort usually employ least some high-tech materials purposely marginal design As fliers learn use capabilities Jumpin Geo its siblings will opening new chapter sport RC Aerobatics information about specialized fun-fly models have look Jerry Smiths built-up design December 1990 RC Report see Dan Stevenss hollowed-foam wing design February 1991 issue same magazine articles also provide good reference options building Jumpin Geo model really something else fly Its responsiveness will amaze its first contest FARM fun fly near Warrenton Virginia Jumpin Geo placed first time takeoff climb 15 seconds spot landing first Fast-Slow first takeoff number loops 30 seconds Geo unlikely excel AFTER YOU DID ALL THE WORK WHY LET YOUR AIRPLANE DO ALL THE FLYING INFO $500 AWARDED Grand Champion Reserve Grand Champion Ultralight 1989 Sun-N-Fun Fly-In BUILD & FLY THE miniMAX YOURSELF o Computer Designedr3 Axis Control o Part 103 Ultralight Easy Construction Wood Construction TEAM INC BOX 338M BRADY VILLE TN 37026 615 765-5397 November 1991 93 Spend less time buildin& mare tn Sheets available ONLY iu Thre ailable 1/16 x 12 x 35 Stock #6650 3/32x 12x 35- Stock #6651 1/8 x 12 x 35 Stock #6652 PMID PRODULru iIC 4shma Htff44tl994Z-1134 a199tMltPdUt5COlftC1 #5-91-153 Electric F ight Llghtweiglt 12 00money bark Adjustable switching point Soldertess terminal ror easy bookap $2 gna ee ON/OFF Controller995 Mare Powe sa ewe gh 20 Size 22xt3x63 el1trenry anty 006V loss Add S1 ohippio3 Clifoois araidonls add 725% 12 17 Tao Send Check money order Comes sith//High Sky Fntabaoranartrr3929 Kansas St #9 other Cosrectors orer.2. flA 92104 olso availableSan uuun beauty contest otherwise its probably unmatched Jumpin Geo puts whole new perspective RC flying makes fun-flying challenge again Build yourselfand enjoy0 Show Begin/Iden Continued page 25 Circlemaster AST Sussex Wisconsin Safety number have show teams performing before hundreds thousands people safety primary Sometimes lessons learned away show practice field pretty 4-scale Sig Cub shown photos belonged note past tense yours truly Cub yet fly air show offing little yellow OS 40 four-cyclepowered ship favorites made some 30 flights cartwheeled several times nasty crosswinds before two successful takeoffs during slow roll wings suddenly snapped right center model streamed straight hard drought-baked ground two wing panels fluttered earth drove home safety lesson Check aircraft thoroughly after seemingly minor toss-around checked wings various other important parts after cartwheels appeared order Struts secure points landing gear unscathed tail section solid no flex wings etc taken time remove wings cabin however examined center section would have found fractureprobably very smallin front center section cabin stress wires attach front wing fuselage Thats structural failure apparently occurred Its Satisfaction Guaranteedi EAYHINI 5H-710 Pkg 24 $2 95 THE HIGH-TECH HINGE DESIGNED FOR THE CYANOACRYLATE AGE Easier install other hinge No gouging picking messy epoxies Simply cut single knife slot hinge slide hinges place apply few drops favorite CA glue youre done SUPER FAST SUPER EASY SUPER STRONG 7de ee4 fo e4a MFG CO INC.401-7 So Front St.Montezuma IA 50171 623-5154 PRODUCTS FOR THE DISCERNING MODELER Complete Line Exhaust Systems * Tuned Pipes Muffled Tuned Pipes * Headers * Venturi Mufflers * Expansion Mufflers copter Ball Mufflers ialized Exhaust Systems Unsurpassel W,ki,n Drfomanc 94 Model Aviation TAKE THE HOBBY SHOP HOME WITH YOUM THE 15th ANNUAL RADIO CONTROL BUYERS GUIDE ts reference gutde oIl R/C hobbies Browse through guide find items need ond youll know just whot ask favorite hobby shop RADIO CONTROL BUYERS GUIDE lets turn wish list o shopping list knowing whats ovoilable con plan new projects improve existing projects Price informotion olso helps add up just whot plons will cost Look RADIO CONTROL BUYERS GUIDE local hobby shop call 800 533-6644 order ccc... eeceoccc ceoceec c eeecec eec Jo order send Dept X0419 RADIO CONTROL BUYERS GUIDE PO Box 1612 WaukeshaWI 53187-1612 YES Id like order _____ RADIO CONTROL BUYERS GUIDES #13002 $ ______ J Payment enclosed J Charge account Please print Name_________________________________________________ Street______________________________________________________[v33][b22911249163110790]] City State Zip__________________________________________________ Country_____________________________________________________[v33][b24421331183111470]] Charge Li Mastercard Li Visa Li American Express mm $15 Card#_________________________ Exp Date_____________ Signature Include tar postage handling US 3300 canadian tareign add 18% minimum $400 Wisconsin residents add 5% sales tas canadian araers add 7% GST ta tatal Price availability sublect ta change Payable US tunds Dept X0479
Edition: Model Aviation - 1991/11
Page Numbers: 12, 13, 14, 15, 16, 17, 18, 19, 93, 94
I Above Using geodesics lightness coupled torsional strength Jumpin Geo puts whole new perspective compe tition fun-flying makes challenge again As fliers learn use performance capabilities design Its siblings will open new chapter sport RC Aerobatics Below K&B 45 engine spinning Rev-Up 11 x 4 prop produces over three pounds static thrust giving Geo full vertical capability Maneuvers incredibly close-In tight Put good 45 glow engine 3-lb RCer start blowing away competition fun-fly events EJohn Hunton U Bill Winter TO EXCEL fun-fly events model must able maneuver quickly tightly about axes means must weigh very little have low wing loading Jumpin Geo excels fun-flying points new direction RC airplanes designed such events Overall performance maneuverability incredibleunlike anything ever seen RC model Maneuvers remarkably close-in tightloops rolls take about secondand turns unbelievably quick plane has full vertical capability achieve desired lightness sacrificing strength used geodesics torsional rigidity flying surfaces fuselage eliminates need usual D-tube sheet leading edge Also since front wing nonstructural can cut out fuel tank Taking advantage lack emphasis high velocities fun-fly events designed economical structure considerable thickness flying surfaces interdependent spaceframe like members produce extremely light structure still allows full range speed flight Because lightness coupled elevator aileron/flaps model can also flown remarkably slowly Jumpin Geo weighs close three pounds built care uses 40 45 engine K&B sport 45 swinging Rev-Up 11 x 4 propeller produces well over three pounds static thrust giving spectacular vertical performance Take off point airplane up will reach sky Construction Since very lightweight models require simplified structures theyre relatively fast easy build can save few ounces using optional rolled sheet leading edges flying surfaces substitute relatively soft x -in rounded balsa youre using rolled sheet its good idea begin preforming surfaces November 1991 13 Vertical performance impressive model takes off couple feet has known sprint unexpectedly air during taxiing models can take straight up rolling author highly competitive Tun tiler traces its design roots such CL novations HA Thomass coupled flap/elevator concept Stunt models introduced 1947 Huntons may geodesic fun-fly RC will hold together full bore Left rolied tube ol son Vie sneet Daisa used leading edges movable surfaces fin stabilizer ne sneets wetted formed successively around -in %-ln dowels wing leading edge also 1A sheet molded broomstick single step Sections made wrapping wetted sheet around form elastic bandage Right wing ribs can stack sawn full-length ribs installed bias interrupted ribs other Start center work toward tip Special construction features Build wing leading edge fairing soaking two-inch wide strip /16 medium-soft balsa strip rolling around broomstick Soak strip hot water least hour tape end side broomstick Wrap balsa around broomstick Ace bandage Allow assembly thoroughly dry leaving warm place overnight Remove bandage have nicely formed leading edge fairing Use 36-in-long hardwood dowels 3A-in two %-in diameter leading edges other flying surfaces Soak 1-in strip soft /16 balsa wrap around 3A-in dowel allow assembly dry overnight Remove balsa soak again wrap around pair %-in dowels glued together Roll another strip 3A-in dowel repeat two-step procedure balsa cracks use softer strips next time Make enough leading edge material entire model plus reserve Lone Star Models 1623 57th St Lubbock TX 79412 excellent balsa supplier following order will provide almost everything need 26 sheets A6 x 3-in selected soft 6-9 lb/cu ft selecting costs additional 15% two sheets /8 x 4-in selected soft four sheets /16 x 4-in unselected 12 sheets sq eight 4 x also unselected Youre provided surplus select Youll also need some A-in-thick plywood firewall other thicknesses aileron/flap servo mechanism wing skid shear plates Go through balsa own selecting Holding sheet up bare light bulb allows its characteristics come shining through Save wood straightest clearest grain rolling leading edges use rest ribs Wing Building geodesic wing looks lot challenging Its interesting task really difficult jigsaw band saw available stack saw ribs cut few extra ribs parts youll have hand easy repairs Battle damage tends limited structure lightweight Cut wing ribs half Begin building either top bottom wing half flat board pin full-length ribs direction fill partial ribs other direction 14 Model Aviation wing spars constant cross section variable density accommodate differing structural loads Firm wood used center section wIth soft wood tip xx INzK w t wing half built flat board over plan installing ribs cen ter outward prevents compounding errors wing center section spar webbing Bias balsa filler installed center bay help distribute flight loads between top bottom spars Left Note sculptural quality completed wing half second half can built directly stop first pinning latter down spar bracing up trailing edge Right aileron/flaps elevator rudder identical cross section use same ribs diagonals diagonal bracing greatly improves torsional stiffness Ultralight rolled balsa leading edges can used NO OCR TEXT Full-Size Plans Available. Page 196 I/B H I/H FIRM BALSW. DIAGONAL RIB HORNR ERR HGEUNE- ~INRO06 SREE I/AG 3/B H1 RD BALSAI/lB H I/Z~ I/lB H 3/B HORARTS HINGE POINTS______ 1/16 0 I/O TRIM RIB FOR I/lB SHEET TOP AND BOTTOMI IN ROLLED 1/16 IN SHEET SLOT FOR FIN POST I/HO DETAIL / / / AV SEE STABILIZER ELEVATORFOf II II1/40 3/B HARD BALSA POST IIORNOPP II BS 1 IADO BOUNDAN BOB N PO I-BE ORE N ALLN 1iACOT OUT WING EL TANK I r FOR BOOBBASA BHR H SGNOERONS FIBEWALL TEMPBALANCE POINT TORE COLAR-1 I/B IN WIREOPTIONAL SSF~ iOPTIONALLONG NOSEMINI -SEHVI FORBATTERY/RECEIVERBIBS BALSA I/lW WIRESPIDER MOUNTTRROT IN BOTTOMBOO 3/30 BALSA 50 PP OR TBASSWOODBROD GUIDERIBS 1kB FIN 6000 STAB ELEUAILEBOBS FOR KWH 45 SPOBYSTERI I II 47/A RNB 0006I--I- TEMP RD ELEWOR B 0 SHEE J UMPIN G EO DESIGNED AND GRAWI JOHN HONTON199 would lead cumulative errors Instead start center work toward tip errors begin creep just make sure keep ribs absolutely parallel plan position eventually theyll work out Except otherwise noted use medium-density balsa Since variations will occur balsa put advantage using harder ribs middle softer ones toward tips Use CyA cyanoacrylate glue assembly except another adhesive specified wing spars laminated different densities balsa hard wood middle lighter density tips wood should selected carefully Join spar pairs Install spar trailing edge surface sheet rib assembly remove building board Youll note assembly already has high torsional strength Strength bending however poor Pin down completed wing half spar brace up trailing edge build second half over first Install remaiaing ribs second spar trailing edge piece Reinforce center bay wing spar layer bias-grained balsa bias balsasheets /I6 balsa glued together grain opposite 45 B angles material very light yet provides good diagonal stiffness rigidity Add diagonal spar bracing Add trailing edge vertical sheet rolled leading edge Shave necessary ribs add center section sheet Build up tips Fit A6 skid shear plates under wings Cover sheets spar area lightweight fiberglass CyA Drill install %2-ID brass tubes Coat tubes rib intersection baking soda CyA Block sand wing using large sanding block Take care overdo sanding ribs between joints Check reglue open joints Add about oz weight left tip counteract offset weight engine cylinder muffler may have adjust amount later Build remaining flying surfaces Pin down leading edge add true ribs trailing edge Fit diagonals assembly flat bench diagonal members cut same basic shape 16 Model Aviation CI CUT TO ViA VI CLEAR LI \TAHW2J NO BIAS BALSA PRE- FORMED WITH TWO LAYERS I/lB BALSA WITH GRAIN 45 OPPOSITE DIRECTICNS\, stabilizer elevator under construc tion stab fin built up -inthick ribs root sections reinforced firm solid balsa stub spars fuselage sides made bias balsa sheets 1A balsa glued together grain opposite 450 angles Half weight Lite Ply good strength sheets preassembled slow-setting cyanoacrylate installed fuse lage frame trimmed Full-Size Plans Available Page 196 WA ~--flMA A4 BAII ORII II GRAM INITIAL CONTROL TRROWS RODDER Z5 ELECATOR DO AILERON 20 FLAP ADDS 15 W RE SPACE CONTROLS SEROD INSTALLATION LAPAORDER ____ W AXJX FRAME I/B LITEPLO ERS-/S LITEPLY AD C KEEPERS I/S LITEPLO SHUTTLE 3/SD AIRCRAFT PLF AADRORT MOONTRA S55 SRDRT MOONS 6-3D SCREWS NOTCH WIRE5/32 IE RRASS TORE LIGHTENIND ROLESCREW I/A PLYWOODSOLDER LAD WIRE WRAPSILOER SOLDER I/S M W3/3D M LITEWEIGHT WREEL SHORT MDANT -LSNS NDSE FIRED WREEL OPTION WIND SKID DETAIL FORMED LE DETAIL FOR TAIL AILERONS MATER LINE IJUMPIN GEo DE SIDNED AND DRAWN JOHN RANTDN1991 complicating factor otherwise straightforward wing construction sanding aileron/flap tips Build tips flat bench Sand top surfaces proper thickness bring surfaces alignment rest structure bottom surfaces tips will sweep upward giving appearance being warped Place flat area top apparentiy warped area bottom addition producing tapered tips irregularity creates certain amount washout upright wing improves stall characteristics stabilizer rudder built -in-deep ribs diagonals Fuselage Builders options either fuselage long nose short mount short fuselage spider mount spider mount permits installation simple lightweight steerable nose wheel See Flying section viewpoint opinions Begin fuselage construction building up bias-grained sheets A6 stock ouflined wing construction section using slow-cure thick CyA Select hard straight-grained wood longerons Soak four longerons hot water Pin down over plans add uprights note temporary verticals Allow assembly dry overnight remove hom board Add top bottom crosspieces Install firewall 6-32 blind nuts place engine mounting Cover fuselage bias-grained sheeting front A-in sheeting toward rear Round fuselage corners carving sanding Cut openings wing-fuselage joint As final step before assembly add baking soda fillets fortified CyA inside nose area Landing gear system Jumpin Geo uses combination nose wheel wing skids Although saves weight makes very poor taxiing characteristics low speed Taxi grass extreme care nose wheel/wing skid system does give excellent performance high ground speeds means can plant model having stall landing touchdown great touch-andgoes over line skids literally grab grass can keep power steer confidence pull up go again will could add wheels skids small weight penalty Tailor Geo way youll flying competition Covering Cover surfaces using lightest material practical used transparent MonoKote prototype since seems lighter solid-colored variety first prototype covered single color November 1991 17 fuselage sides built directly atop other sake accuracy Use waxed pa per over plan betwen sides prevent unwanted adhesion photographic purposes easy quick orientation however its good idea put large identifying color swatches top bottom cover top bottom different colors second prototype covered Micafilm lighter weight MonoKote Cut covering material mating surfaces assemble parts Use baking soda fillets CyA such critical areas wing stab installations Since wing removable hinge ailerons until wing installation has completed Complete hinging installation epoxy install control horns Final assembly Install round four-ounce fuel tank front fuselage/wing area Cut disc plastic top margarine container cover fuel tank hole firewall Drill disc engine mount holes fuel lines Seal plastic firewall silicone sealant Install radio control gear directly through top fuselage linkages will exposed routed interior fuselage Note directions optional coupled aileron/flap elevator Stack receiver battery wrap thin foam Measure assembly size RC box Build box 3/ balsa cut opening fuselage top sheeting just behind wing spar 18 Model Aviation fuselage side frames ready covered bias-grained balsa Bias balsa provides good diagonal stIffness rIgIdIty adding little weight Full-Size Plans Available Page 196 NOTE- DIAGONAL RIBS ARE SPLIT ON TB S INE DIAGONAL RIBS 6 REOUBEG I/IS BALSA I/B H /6 FIRN BALSA BR -IL 1/16 SHEOT TOP N BOTTOM THIS AREA L FOB FOEL TANS 0 AGONA RIB \KN RIB CAT CENTER TWO BIBS TO FIT BETWEEN DIAGONALSIS BEOGIBED I/IS BALSA I/A 3/B BALSAHINGE UNE ST-IN 1/16 BALSAWINOT P DE AlL CORER W/GAGSOH 3/32 DASS TGBE TBOE SELECTED HARDHARDRI B I/A SO SPARS~SGFT -A--- SOFT N ROLLED I/IS ISGFT FILL JUMPIN GEO DESGNEG AND DRAWN JOAN HANTON 1991 Cut openings rudder elevator servos top RC box choose optional coupled flaperon/elevator function youll also need cut hole aileron servo coupled aileron/flaps-elevator aileron servo slides shuttle actuated elevator servo ailerons move opposition elevator increased lift elevator moves up elevator servo pulls aileron servo aft droop flaps elevator moves down flaps raised Use 14-in -sq members mount servos positioning across fuselage under top sheeting Predrill holes servo screws prepare holes CyA Build up aileron servo shuttle track install fuselage Cut opening throttle servo Install servos have super transmitter may want use spoiler function servo wing rather coupled aileron/flaps-elevator function single servo Install front wheel side skids engine K&B Spider mount offers simple lightweight steerable nose wheel option point provided youve thinking light model should weigh ready go slightly over three pounds K&B 45 engine spinning 11 x 4 Rev-Up propeller recommended power setup Carefully check center-of-gravity Later balance point can incrementally moved rearward desired control response Begin slowly using recommended control throws build up gradually much control motion can handle Hying As mentioned model will fly successfully either fixed steerable nose wheel use spider-type mount does prototype steerable nose wheel can added little additional weight fixed nose wheel Jumpin Geo can steered using elevator keep nose light using prop blast over rudder make turn Its important practice repeatedly before taxiing out around people planes taxi too fast model will take off prematurely Any model design has built-in structural limitations Jumpin Geo dont use full control stick deflections flying fast want turn tight slow down first loops turns actually tighter start relatively slowly Use Continued page 93 November 1991 19 MATCH OTHER SHE 1/6 author bolts K&B 45 engine K&B spider mount permits installation lightweight steerable nose wheel Exposed BC gear gasp Gec sacrifices frills lightness aileron servo mounted shuttle actuated elevator servo coupled aileron/flapselevator function say about product call Ernst Ni-Cap protective cover fits brands Ni Cd glow plug igniters thousands other modelers have time another dropped glow plug igniters dirt have watched roll off table have put pockets have short out against keys some other metal object short out pocket few years ago after started Pylon Racer pitched air About five laps race felt something burning leg lucky enough get out before burned able finish race Ni-Cap does three things 1 prevents shorting 2 eliminates rolling glow plug igniter syndrome 3 keeps plug end clean foreign objects Ni-Cap orange plastic cap molded tether has loop end slips over shank glow plug igniter tether prevents losing cap also serves prevent glow plug igniter rolling off top field box landing dirt have word caution igniter use cap tether sticking out right angles shank igniter make sure facing away prop Should want buy Ni-Cap contact Ernst Manufacturing Inc 37396 Ruben Lane Sandy OR 97055 phone 503 668-5597 usually end up column wishing safe month now believe safe month dont feed body parts through rotating prop D Jumpin Geo/Hunton Continued page 19 four-pitch propeller keep airspeed down vertical capability up Models turn tightly produce considerable G-forces high speeds youll need exercise good sense Fun-fly model design entering golden age Most innovative aircraft use 0S 32 engine Jumpin Geo weve climbed 45 power yet still kept within three-pound wall Geo flies slowly unbelievably tightly also penetrates winds macho style airplane bridges gap between ubiquitous traditional Ugly Stick types delicate new-generation modelsthe sort usually employ least some high-tech materials purposely marginal design As fliers learn use capabilities Jumpin Geo its siblings will opening new chapter sport RC Aerobatics information about specialized fun-fly models have look Jerry Smiths built-up design December 1990 RC Report see Dan Stevenss hollowed-foam wing design February 1991 issue same magazine articles also provide good reference options building Jumpin Geo model really something else fly Its responsiveness will amaze its first contest FARM fun fly near Warrenton Virginia Jumpin Geo placed first time takeoff climb 15 seconds spot landing first Fast-Slow first takeoff number loops 30 seconds Geo unlikely excel AFTER YOU DID ALL THE WORK WHY LET YOUR AIRPLANE DO ALL THE FLYING INFO $500 AWARDED Grand Champion Reserve Grand Champion Ultralight 1989 Sun-N-Fun Fly-In BUILD & FLY THE miniMAX YOURSELF o Computer Designedr3 Axis Control o Part 103 Ultralight Easy Construction Wood Construction TEAM INC BOX 338M BRADY VILLE TN 37026 615 765-5397 November 1991 93 Spend less time buildin& mare tn Sheets available ONLY iu Thre ailable 1/16 x 12 x 35 Stock #6650 3/32x 12x 35- Stock #6651 1/8 x 12 x 35 Stock #6652 PMID PRODULru iIC 4shma Htff44tl994Z-1134 a199tMltPdUt5COlftC1 #5-91-153 Electric F ight Llghtweiglt 12 00money bark Adjustable switching point Soldertess terminal ror easy bookap $2 gna ee ON/OFF Controller995 Mare Powe sa ewe gh 20 Size 22xt3x63 el1trenry anty 006V loss Add S1 ohippio3 Clifoois araidonls add 725% 12 17 Tao Send Check money order Comes sith//High Sky Fntabaoranartrr3929 Kansas St #9 other Cosrectors orer.2. flA 92104 olso availableSan uuun beauty contest otherwise its probably unmatched Jumpin Geo puts whole new perspective RC flying makes fun-flying challenge again Build yourselfand enjoy0 Show Begin/Iden Continued page 25 Circlemaster AST Sussex Wisconsin Safety number have show teams performing before hundreds thousands people safety primary Sometimes lessons learned away show practice field pretty 4-scale Sig Cub shown photos belonged note past tense yours truly Cub yet fly air show offing little yellow OS 40 four-cyclepowered ship favorites made some 30 flights cartwheeled several times nasty crosswinds before two successful takeoffs during slow roll wings suddenly snapped right center model streamed straight hard drought-baked ground two wing panels fluttered earth drove home safety lesson Check aircraft thoroughly after seemingly minor toss-around checked wings various other important parts after cartwheels appeared order Struts secure points landing gear unscathed tail section solid no flex wings etc taken time remove wings cabin however examined center section would have found fractureprobably very smallin front center section cabin stress wires attach front wing fuselage Thats structural failure apparently occurred Its Satisfaction Guaranteedi EAYHINI 5H-710 Pkg 24 $2 95 THE HIGH-TECH HINGE DESIGNED FOR THE CYANOACRYLATE AGE Easier install other hinge No gouging picking messy epoxies Simply cut single knife slot hinge slide hinges place apply few drops favorite CA glue youre done SUPER FAST SUPER EASY SUPER STRONG 7de ee4 fo e4a MFG CO INC.401-7 So Front St.Montezuma IA 50171 623-5154 PRODUCTS FOR THE DISCERNING MODELER Complete Line Exhaust Systems * Tuned Pipes Muffled Tuned Pipes * Headers * Venturi Mufflers * Expansion Mufflers copter Ball Mufflers ialized Exhaust Systems Unsurpassel W,ki,n Drfomanc 94 Model Aviation TAKE THE HOBBY SHOP HOME WITH YOUM THE 15th ANNUAL RADIO CONTROL BUYERS GUIDE ts reference gutde oIl R/C hobbies Browse through guide find items need ond youll know just whot ask favorite hobby shop RADIO CONTROL BUYERS GUIDE lets turn wish list o shopping list knowing whats ovoilable con plan new projects improve existing projects Price informotion olso helps add up just whot plons will cost Look RADIO CONTROL BUYERS GUIDE local hobby shop call 800 533-6644 order ccc... eeceoccc ceoceec c eeecec eec Jo order send Dept X0419 RADIO CONTROL BUYERS GUIDE PO Box 1612 WaukeshaWI 53187-1612 YES Id like order _____ RADIO CONTROL BUYERS GUIDES #13002 $ ______ J Payment enclosed J Charge account Please print Name_________________________________________________ Street______________________________________________________[v33][b22911249163110790]] City State Zip__________________________________________________ Country_____________________________________________________[v33][b24421331183111470]] Charge Li Mastercard Li Visa Li American Express mm $15 Card#_________________________ Exp Date_____________ Signature Include tar postage handling US 3300 canadian tareign add 18% minimum $400 Wisconsin residents add 5% sales tas canadian araers add 7% GST ta tatal Price availability sublect ta change Payable US tunds Dept X0479