Can new American balsa-framed FAI models beat European glass smoothies sensatior scratch-built has blowing everyone off courses major meets U Ray H designer 900 unpracticed eye sailpianes look fairly standardized mix hidden things tooled attain some very specific flight-performance goals evident will note both pictures sheen very smooth wing IT IS thing build sailplane manu factured kit quite another design build scratch Scratch building can defined ominous words boss What working hard peers calculator writing pad filled strange him numbers planfonn scribblings asks dividing everything 144 Scratch building also cutting own wing ribs learning mistakes ig noring negative comments about dream ship Needless say scratch building successful can satisfying aspect modeling recommend anyone looking way release creative moods Osprey 900 designed win FAI team selection program 100 inches wing span likely happen consistency effort questionable start As matter fact three Standard Class airplanes finished top twenty 900 did have fastest total time speed event turned 136 -140 144 order claim fame accomplished Pensacola wing loading 865 ounces empty flew speed task 1314 ounces Interestingly during second third day competition ship became subject tip stall flying slower required rudder trim As result kept adding nose weight Dropping first place end round three twelfth overall six-round contest gave lot think about during long drive home sus picions developed may have lost washout right maybe cool too wings built washout fully sheeted managed warp structure washout during Augnst must confess trouble keeping washout didnt remem ber check during contest Sure enough left wing flat right panel off just bit Thats living learning maiden flight occurred during January 1978 Ana Maria Island Florida its first speed run late April back home Indiana ship base B midway through turn nylon center box exploded allow ing wings conform average V anyones alphabet heard crash fortun ately didnt see may have width daughters eyelash between Mono Kote turf narrowly qualified Brandon Florida May quarter-final used Aquila hanging out garage since 1976 could have flown Detroit quarter-final Florida during January can understand family wanted return May During second trip Florida Osprey hospital recuperating new center boxes being milled aluminum nylon center box strong enough 14 Model Aviation FULL SIZE PLANS AVAILABLE SEE PAGE 128 What seemed first throw-away picturesa common situation construction featureswas included because its striking portrayal simplicity rugged construction Tail would toward leftnote wing blade center box wing-wire tube Fuselage sheeted four sides 1/16 very light 3/32 sheet balsa Protruding wire left visible portion wing-flap hom assembly Engages Goldberg horn shown top view wing plan Partially built fin showing mounting stabilizer control horneither ply shown Airtronics Hinges mount spruce post FAI speed task However very good normal thermal competition Upon return used 14in drill remove nylon box fuse replaced aluminum box wing blades removable center box eliminates slop wing joiner assembly Now looking down throat first Great Lakes contest LOFT weekend just three hours flight time Osprey During contest circuit became very apparent lot learn about monster January1980 15 ---~tI-1--_-if II 0 OSPREY 900 SESIGNED S GRASS SY RAY HAYES 1/16 light C-grain balsa ribs stack sanded using 1/32 ply tem plates Author considers variable cambered airfoil answer being managed carefully controlled use wing flapsfor example raising flaps produces semi-symmetrical section produces speed hence penetration Considerable comment article PLYWOOD RIBS AS SANDINGUP ELEVATORLI SLO nfl1 1A6 SHEET BALSA TOP SIDES BOTTOM A RIBS BETWEEN ARE SANDED 10 UNIFORM TAPER ALUM TUBING FOR WING HOLDING RUBBERS WING BLADE1/16 WiRE TO FLAP CENTER BOXHORN AND BELLCRAN ____________3/16 X 3/BSPRUCE RAILS FOUR SERVOSFRCtvI NOSE TO WING TE IN COCKPIT BALSA SHEET CANOPY OR SOFT BLOCK HOLLOWED TO CLEAR RECEIVER [v32][b-2-10-1-10]] 2][b-1-10-1-10]] LOCK DOWEL V16 PLYWOOD SERVO TRAY yB1 PLYWOOD 4l HARDWOOD NOSE BLOCK AIRITRONFCS NYROD THRU RIBS TO SPOILERS 1/8 LITE-PLY BALLAST BOX FROM NOSE 10 FROM SIG FORMER 5I/B LFrE PLYI/B PLY COVER 1/16 PLYWOOD CAP RIB @JER WING BLADE 1/16 PLYWOOD FRONT SPAR WEB 16 Model Aviation 1/4 SQ BALSA ALL RUDDER FRAMINGDOUBLED AV TIP AND TRAILING EDGE AIRITRONICS ELEVAlOR HORN 1/16 X 1/4 SPRUCE ON RODS OUT PLYWOOD WEBS POST STIFFENER V32PLYWOOD BUTT RIBI/32PLYW300 AND RIB WEBFIN SKIN3/16 SQ SPRUCE POST 1/4" BALSA BLOCKS 3/16 X 1/4 T E t4YOD r0 ELEVAlOR1/16 X V4CAP STRPS AS RIBS TOPAND BOTTOM OFSPAR 1A6ID TUBE FOR WING WIRE3A6 4 SPRUCE SPAR TAPERED 3A6 SQ SPRUCE ALL LONGERONS SAILPLANE ACC CO NYLON______ WING BLADE BEiWEEN SPARS 1/16 SHEET COVERS TE 1/16 PLYIAOD REARTOP AND BOlTOM SPAR WEB1/4 X 1/2 TAPERED BALSA REAR SPAR1A6X 1/4 CAPSTRIPS ON RIB TOPSAND BOTTOM V16 SHEET FLAP TOP TE SlOCK FORAND BOTTOM1/16 BALSA WEBS ON SPAR SPOILERFRONTS ONLY BALSA BLOCK TIPS I/16SHEET WEBS , / 1/4 SQ SPRUCE TOP SPARS 1/8 X 1/4 SPRUCE BOlTOM SPARS 1/8 X 1/4 SPARSV 16 BALSA SHEET POLY BRACETOP AND BOTTOM3/8 X 16 HARD 1/16 BALSA ALL RIBSFRONTAND B2KlOP & BOTTOMOF LEADING EDGEBALSA LETAPERED January1980 17 No big deal always interesting see arranges dihedral case outer panels Leading edge round sharp After sheeting laid plans cut shape straightedge struc tural members fall place Wing-blade assembly tacked between spars against forward plywood spar web Use angle gauge root rib created particularly amount ballast add under various conditions use flaps thing discovered has terrific thermaling ability fully ballasted wind gauge said 22 mph gusts 30 launched blue sky loaded cumulus clouds After couple minutes two-thirds launch height detected thermal part turned out went down wind got back up launch altitude whole new world hopped fragmented thermal another until nearly out sight mile down wind wanted rename Wind Machine flying 1314 per sq ft few days later high-pressure cell near zero wind condi tions launched full ballast box time club field thermalled like full scale Osprey migrating North take up housekeeping flying buddy Frank Wren couldnt believe way climbed out Fully loaded weighs 91 ounces 1978 competition come end felt fairly satisfied design second Osprey completed Ospreys 1979 performance good first overall Great Lakes RIG Soaring League Championship Circuit Weather condi tions varied nearly blow out Stars Sturgis Michigan overcast almost dead calm Soars Sod Farm 900 also blew everyone off speed course during LSF Tournament 1980 year will interesting FAI par ticipants us going out develop balsa-framed model will beat Europeans glass smoothies Lee Renaud working very hard area great success us including Lee have deep feeling national pride fully expect win back Worlds Team Championship 1981 have little knowledge slide rule aerodyna mics rely own experiments conducted over last four years first attempt FM team 1976 Osprey 100 580-sq thermal fixture also flaps met bitter end Base B during speed run semi-finals Osprey 900 will fold its wings speed run use once burnt de sign engineering concept better known will never happen again sheeted 900 used -in sq spruce spars top blade system absolutely rigid will allow wing flex during launch Jerry Mrlik taught us years ago Astro-Jeff Also blade assembly allows quarter-midget-type turns speed event Sheeting wings doesnt add significant weight proper wood used does take time am convinced makes dif ference believe top sheeting design should approximately inch behind airfoils high point probably has same effect fully sheeted wing Put stralghtedge chord-wise wing covering dropping below ribs between trailing edge rear top front sheeting 1/16 inch have modified airfoil Generally sag can eliminated wider top sheeting used front rear airfoil creation will fly extremely well heavily loaded yet float necessary 108% thick high point 40% chord root might walking middle controversy advocating fairly thick wing others advocating thin wings am trying solve Midwest problem high winds takes strong wings survive launch 20 mph winds gusts 30 airfoil performs well loaded up area performance means pen etration downwind flight believe just beginning see little daylight seach all-purpose airfoil semi-symmetrical airfoils use now showing us what can happen try some thing different Remember started undercambered Olympics progressed flat bot toms personally believe variable airfoil answer flaps reasons like flaps ability change airfoil flight Raising flaps produces semi-symmetrical airfoil produces speed means penetration center gravity pushed way back raised flaps will produce stab ility needed air becomes turbulent thermal Raised flaps also aid landing windy conditions will bore right through ground turbulence give control need under conditions have trouble deciding whether build Osprey 900 flaps maybe can help Flaps require great deal practice before can use advantage camber angle attack change flaps actuated end result perfor mance depends center gravity location performance also squared pilots knowledge reactions show up instant move flaps cases tendency over-use flaps Whereas may take 20 flying hours learn new ship well will take minimum 40 hours master use flaps CONSTRUCTION Proper application various grades balsa will improve flight performance longevity structure example C-grain sheeting trailing edges will remain straight much longer period A-grain Wing ribs should also C-grain Use contest grade balsa except fuselage sides should use medium weight A-grain Sources information balsa wood application Sigs catalog Frank Zaics Model Glider Design library book John Kaufmann Flying Hand Launched Gliders terested learning about gliding flying models suggest also read Donald Footes book Aerodynamics Model Airplanes Continued page 110 18 Model Aviation entire installation revealed removal long hatch Well- protected receiver raised picturewhich explains perhaps mysterious drill Note ballast boxportion opening visible rightbutts against rear servo tray withstand impact An interesting point wing progressively thickens high point moves forwardno tip washout WWI MODEL ACCESSORIES FINE QUALITY MACHINE GUN KITS 4LLOzA5 iiLNc Osprey 900/Hayes continued page 18 Library Congress catalog card number 526339 Wing Start making three wing rib templates 1/32 plywood Cut templates plans glue plywood rubber cement Select 1/16 light C-grain balsa rib material Cut sand conform templates using stack method Use ribs through five make half ribs through D Lay sheeting plans cut shape straightedge Glue bottom spruce spar sheet ing white glue stick pins spar Cut trailing edge sheeting pin plans Glue bottom cap strips leading edge sheeting cyanoacrylate example Hot Stufi Use angle gauge glue root rib Glue ribs seven through 11 13 through 19 Number 12 rib omitted until polyhedral joint structured Cut glue white glue foreward 1/16 plywood spar web top bottom spars after installing top spar Ribs two through six cut half accom modate plywood spar webs Install WHEELS TS INGS SEND SOf FOR COMPLETE CATALOG DEPT MA S 181 PAWNEE STREET SAN MARCOS CALIFORNIA 9 ribs except rear portions ribs two through four Install ribs through D wing blade assembly tacked between spars Make sure flush against foreward plywood spar web Cut root rib tween spars allow bottom nylon blade jacket protrude / 16 beyond root rib plywood root cap will surround jacket rear pin tube also protrudes through plywood root cap Set wing half leading edge use epoxy mixed micro balloons fill around nylon boxes Use slow-curing epoxy Install rear plywood spar web rear portion rib ribs two through four Install rear alignment pin tube decided use 7/32 wing rod place blade assembly place two inner panels flat board raise both ends up 23/16 Install wing tubes tacking cyanoacrylate baking soda just enough keep tubes moving slide wing halves apart wing tubes should per fectly horizontal accomplished putting rod inside tubes before tack using sighting device horizontal building board Lay inboard tip panels flat surface Raise tip panel 1-Y4 Sand spars leading edge bottom sheeting necessary form good joint Glue plywood poly brace Cut rib 12 glue both pieces Cut glue 1/16 balsa braces bottom rear sheeting sides rib 12 Glue remaining balsa sheer webs Sand leading trailing edges ribs Lay top sheeting Washout built-in installing sheeting Prototype filly sheeted wings probably wasnt necessary Flaps spoilers option Add plywood root cap tip block Sand leading edge entry point 3/16 above bottom sheeting Mark entry point leading edge reference point sanding Leading edge round sharp Wet wing plan turn over construct left panel Stabilizer Cap-strip ribs leading trailing edge stock super-light weight Start rais ing front rear pieces above plan scrap Add tip block root cap now have outside framework Taper spruce spar shown glue Remove assembly cut cap strips over plans pairs Strips should bit over-sized due curving over spar Using cy anoacrylate glue cap strips frame structure held between knees proceed install cap strips top bottom simultaneously easy once get hang Touch joints regular glue Add plywood joiner braces root cap joiner tubes Drill holes plywood tubes first align dry sand off excess Use stabilizer horn proper wire tube alignment Add fairing blocks root sand entire structure Fin Cut out two fin sides 1/32 plywood Mark pivot hole rear pin plans drill Glue supporting frame sticks shown side Cut hinge slots spruce fin post install Note post extends below fin side Epoxy hinges back side post Cut brass pivot tub insert through pivot hole Add remaining plywood side fin usinz white glue sure have stabilizer horn inside supertrim arm clever little item will use modeler has need adjust servo has installed model arm makes servo totally adjustable length arm provides centering super trim arm features slip-proof interlocking teeth throughout super trim arm available fora wide variety servos sure specify servo ordering product review product review product review 110 Model Aviation ENGINE KITS & CYLINDERS product review product review product review Arm @ $1 982 sets Robart 310 N 5th Street St Charles IL 60174 fin brass pivot tube running through Before glue sets install stabilizer fin use square make sure stabilizer 90 degrees fin Adjust plywood fin side proper alignment Use clothes pins clamp side fin assembly Sand leading edge round Fuselage Cut fuse plans pin surface two 4 X 48 balsa sheets 1/16 thick Select wood carefully constant grain weight hardness two sheets stacked cut fuse sides using plans guide fuse height wing shoulder actually over four inches wide However because fuse corners rounded difference height will problem leave shortage top Cut opening center wing blade box drill hole rear wing pin tube Glue longerons verticals spruce rail vertical 1/16 balsa doublers nose Use ballast box door guide cutting fuse side install ballast box Cut out ballast box patterns Use epoxy install fuse Blind nuts installed Sig Lite ply side box after ply glued drilling holes ballast box door spruce simultaneously Epoxy blind nuts inside fuse Install wing-flap pushrod linkage top bottom sheeting Cut acceptance hole adjust able towhook Sig Lite ply Before gluing bottom add cross pieces blind nuts Sand canopy block fuse original two brass tubes through fuse rubber bands held wings passed through tubes Taper sides top bottom longerons starting four inches rear zero thickness end fuse Attach pushrod bottom hole stab horn cut exit slot rudder pushrod Install flap horn through 1/16 plywood bearing plates building flaps Line up fuse sides glue vertical tail post Make sure fin bottom touches longerons Add formers nose block rear alignment tube wing blade box Use slow-curing epoxy wing box tube have plenty time accurate ly position wing Covering Cover surfaces MonoKote Add color-keyed tape underside fuselage front protect fuse covering landing abra sions Cast Aumlnum K & 840 RJC Engine Mounts Drilled IC ppuO J55t bolt engine mount thats CatAlto 3045i Short Deem ... $6Ott CalMs 30f53 Long Beam 2 S75O new super quiet K&B 40 RIC muffler requireb no exhaust plugs fittinis adapters Muffler machmed fit exhaust stack cover exposed holes Just bolt on.thats Witl reduce noise tO 12 Oecbets tittte no mud rpms e canmtted interposing souttd waves Radi cal free ftom eopsnslon chamber angted btow eoha sot sway usetage sin easy attach provision pressure fitting s NOTE Also aveitsbte ENVA 2B 35 40 45 OS MAX 30 35 40 SUPSA TICKS 021 se 48 Add $100 ectra tsr abs. engines specify type Mounting strap end scam inctuded Dealers Distributors Invited Catalog No 305 Only 1395 Add $125 postage handling CA residents add 6% tax Flying Install radio equipment balance spar initial flights CG can set further back ready Keep towhook forward fiyst flight Remember wings will flex tow first indication too much line pressure will veering left right broken tow line first second ballast boxes hold approximately 11-ounce lead bar third box holds 16 ounces An eight-ounce bar used place 16-ounce bar medium winds have performed outside loops inverted pull outs vertical dives barrel rolls 900 Have fun Aerobatics WC/Lowe continued page 27 stein Ivan Kristensen Canada Gunter Hoppe West Germany Mark Radcliff USA Bruno Giezendanner Switzerland prelim scores showed Dave very slim lead over Wolfgang Ivan Gunter point apart very close leaders Mark about ten points back Ivan Gunter scant point ahead Bruno day finals arrived almost no wind finally Mark first up due luck draw fliers battling fairly strong winds three days great have ideal conditions finals So go finals calling Mark got off absolutely beautiful takeoff proceeded put gorgeous flights have ever seen him put landed fine applause ajob well done apparent set standard others follow Bruno followed good flight lesser score Dave now put super flight typical Dave Brown best took lead Ivan followed good flight quite up Ivans standards Gunter followed score now obviously pressing Mark very closely Wolfgang proceeded put highest scoring finals flight edged out Dave proved clinch world cham pionship him second rounds finals flights proved meaningless since no improved scores freshening breeze finals resulted some reordering contest standings As turned out Dave agoniz ingly slipped first second point judge would have done him Wolfgang moved second first Mark rocketed way fifth third proud Mark Gunter stayed fourth position Ivan slipped third fifth Bruno stayed sixth position Team positions determined scores preliminaries resulted US first again Italy second W Germany third Switzer land fourth Liechtenstein fifth So much joy some sorrow others individual team honors awards given flying site later festive banquet Johannesburg Civic Center can bet yours truly lump throat played national anthem presented us first place team trophy Obviously Dave disappointed barely missing first place handled very well can proud coming back strong real adversity Mark top world placing third made good vow place top three championship Dean also did extremely well considering adver sity could have easily placed top six except engine failure Wolfgang has now won two World Championships 75 79 joins Bruno Doc Brookes US honor championships ajoyful memor able occasion wife Clara Im sure rest attending oppor tunity renew old friendships make new ones tremendous experience seeing enjoying beautiful South Africa first time January1980 111 1/5 SCALE SIZE 80 WINGSPAN 1126 WING AR EA PRICE OhI0 Quiet Power Tatone Makes Easy
Edition: Model Aviation - 1980/01
Page Numbers: 14, 15, 16, 17, 18, 110, 111
Can new American balsa-framed FAI models beat European glass smoothies sensatior scratch-built has blowing everyone off courses major meets U Ray H designer 900 unpracticed eye sailpianes look fairly standardized mix hidden things tooled attain some very specific flight-performance goals evident will note both pictures sheen very smooth wing IT IS thing build sailplane manu factured kit quite another design build scratch Scratch building can defined ominous words boss What working hard peers calculator writing pad filled strange him numbers planfonn scribblings asks dividing everything 144 Scratch building also cutting own wing ribs learning mistakes ig noring negative comments about dream ship Needless say scratch building successful can satisfying aspect modeling recommend anyone looking way release creative moods Osprey 900 designed win FAI team selection program 100 inches wing span likely happen consistency effort questionable start As matter fact three Standard Class airplanes finished top twenty 900 did have fastest total time speed event turned 136 -140 144 order claim fame accomplished Pensacola wing loading 865 ounces empty flew speed task 1314 ounces Interestingly during second third day competition ship became subject tip stall flying slower required rudder trim As result kept adding nose weight Dropping first place end round three twelfth overall six-round contest gave lot think about during long drive home sus picions developed may have lost washout right maybe cool too wings built washout fully sheeted managed warp structure washout during Augnst must confess trouble keeping washout didnt remem ber check during contest Sure enough left wing flat right panel off just bit Thats living learning maiden flight occurred during January 1978 Ana Maria Island Florida its first speed run late April back home Indiana ship base B midway through turn nylon center box exploded allow ing wings conform average V anyones alphabet heard crash fortun ately didnt see may have width daughters eyelash between Mono Kote turf narrowly qualified Brandon Florida May quarter-final used Aquila hanging out garage since 1976 could have flown Detroit quarter-final Florida during January can understand family wanted return May During second trip Florida Osprey hospital recuperating new center boxes being milled aluminum nylon center box strong enough 14 Model Aviation FULL SIZE PLANS AVAILABLE SEE PAGE 128 What seemed first throw-away picturesa common situation construction featureswas included because its striking portrayal simplicity rugged construction Tail would toward leftnote wing blade center box wing-wire tube Fuselage sheeted four sides 1/16 very light 3/32 sheet balsa Protruding wire left visible portion wing-flap hom assembly Engages Goldberg horn shown top view wing plan Partially built fin showing mounting stabilizer control horneither ply shown Airtronics Hinges mount spruce post FAI speed task However very good normal thermal competition Upon return used 14in drill remove nylon box fuse replaced aluminum box wing blades removable center box eliminates slop wing joiner assembly Now looking down throat first Great Lakes contest LOFT weekend just three hours flight time Osprey During contest circuit became very apparent lot learn about monster January1980 15 ---~tI-1--_-if II 0 OSPREY 900 SESIGNED S GRASS SY RAY HAYES 1/16 light C-grain balsa ribs stack sanded using 1/32 ply tem plates Author considers variable cambered airfoil answer being managed carefully controlled use wing flapsfor example raising flaps produces semi-symmetrical section produces speed hence penetration Considerable comment article PLYWOOD RIBS AS SANDINGUP ELEVATORLI SLO nfl1 1A6 SHEET BALSA TOP SIDES BOTTOM A RIBS BETWEEN ARE SANDED 10 UNIFORM TAPER ALUM TUBING FOR WING HOLDING RUBBERS WING BLADE1/16 WiRE TO FLAP CENTER BOXHORN AND BELLCRAN ____________3/16 X 3/BSPRUCE RAILS FOUR SERVOSFRCtvI NOSE TO WING TE IN COCKPIT BALSA SHEET CANOPY OR SOFT BLOCK HOLLOWED TO CLEAR RECEIVER [v32][b-2-10-1-10]] 2][b-1-10-1-10]] LOCK DOWEL V16 PLYWOOD SERVO TRAY yB1 PLYWOOD 4l HARDWOOD NOSE BLOCK AIRITRONFCS NYROD THRU RIBS TO SPOILERS 1/8 LITE-PLY BALLAST BOX FROM NOSE 10 FROM SIG FORMER 5I/B LFrE PLYI/B PLY COVER 1/16 PLYWOOD CAP RIB @JER WING BLADE 1/16 PLYWOOD FRONT SPAR WEB 16 Model Aviation 1/4 SQ BALSA ALL RUDDER FRAMINGDOUBLED AV TIP AND TRAILING EDGE AIRITRONICS ELEVAlOR HORN 1/16 X 1/4 SPRUCE ON RODS OUT PLYWOOD WEBS POST STIFFENER V32PLYWOOD BUTT RIBI/32PLYW300 AND RIB WEBFIN SKIN3/16 SQ SPRUCE POST 1/4" BALSA BLOCKS 3/16 X 1/4 T E t4YOD r0 ELEVAlOR1/16 X V4CAP STRPS AS RIBS TOPAND BOTTOM OFSPAR 1A6ID TUBE FOR WING WIRE3A6 4 SPRUCE SPAR TAPERED 3A6 SQ SPRUCE ALL LONGERONS SAILPLANE ACC CO NYLON______ WING BLADE BEiWEEN SPARS 1/16 SHEET COVERS TE 1/16 PLYIAOD REARTOP AND BOlTOM SPAR WEB1/4 X 1/2 TAPERED BALSA REAR SPAR1A6X 1/4 CAPSTRIPS ON RIB TOPSAND BOTTOM V16 SHEET FLAP TOP TE SlOCK FORAND BOTTOM1/16 BALSA WEBS ON SPAR SPOILERFRONTS ONLY BALSA BLOCK TIPS I/16SHEET WEBS , / 1/4 SQ SPRUCE TOP SPARS 1/8 X 1/4 SPRUCE BOlTOM SPARS 1/8 X 1/4 SPARSV 16 BALSA SHEET POLY BRACETOP AND BOTTOM3/8 X 16 HARD 1/16 BALSA ALL RIBSFRONTAND B2KlOP & BOTTOMOF LEADING EDGEBALSA LETAPERED January1980 17 No big deal always interesting see arranges dihedral case outer panels Leading edge round sharp After sheeting laid plans cut shape straightedge struc tural members fall place Wing-blade assembly tacked between spars against forward plywood spar web Use angle gauge root rib created particularly amount ballast add under various conditions use flaps thing discovered has terrific thermaling ability fully ballasted wind gauge said 22 mph gusts 30 launched blue sky loaded cumulus clouds After couple minutes two-thirds launch height detected thermal part turned out went down wind got back up launch altitude whole new world hopped fragmented thermal another until nearly out sight mile down wind wanted rename Wind Machine flying 1314 per sq ft few days later high-pressure cell near zero wind condi tions launched full ballast box time club field thermalled like full scale Osprey migrating North take up housekeeping flying buddy Frank Wren couldnt believe way climbed out Fully loaded weighs 91 ounces 1978 competition come end felt fairly satisfied design second Osprey completed Ospreys 1979 performance good first overall Great Lakes RIG Soaring League Championship Circuit Weather condi tions varied nearly blow out Stars Sturgis Michigan overcast almost dead calm Soars Sod Farm 900 also blew everyone off speed course during LSF Tournament 1980 year will interesting FAI par ticipants us going out develop balsa-framed model will beat Europeans glass smoothies Lee Renaud working very hard area great success us including Lee have deep feeling national pride fully expect win back Worlds Team Championship 1981 have little knowledge slide rule aerodyna mics rely own experiments conducted over last four years first attempt FM team 1976 Osprey 100 580-sq thermal fixture also flaps met bitter end Base B during speed run semi-finals Osprey 900 will fold its wings speed run use once burnt de sign engineering concept better known will never happen again sheeted 900 used -in sq spruce spars top blade system absolutely rigid will allow wing flex during launch Jerry Mrlik taught us years ago Astro-Jeff Also blade assembly allows quarter-midget-type turns speed event Sheeting wings doesnt add significant weight proper wood used does take time am convinced makes dif ference believe top sheeting design should approximately inch behind airfoils high point probably has same effect fully sheeted wing Put stralghtedge chord-wise wing covering dropping below ribs between trailing edge rear top front sheeting 1/16 inch have modified airfoil Generally sag can eliminated wider top sheeting used front rear airfoil creation will fly extremely well heavily loaded yet float necessary 108% thick high point 40% chord root might walking middle controversy advocating fairly thick wing others advocating thin wings am trying solve Midwest problem high winds takes strong wings survive launch 20 mph winds gusts 30 airfoil performs well loaded up area performance means pen etration downwind flight believe just beginning see little daylight seach all-purpose airfoil semi-symmetrical airfoils use now showing us what can happen try some thing different Remember started undercambered Olympics progressed flat bot toms personally believe variable airfoil answer flaps reasons like flaps ability change airfoil flight Raising flaps produces semi-symmetrical airfoil produces speed means penetration center gravity pushed way back raised flaps will produce stab ility needed air becomes turbulent thermal Raised flaps also aid landing windy conditions will bore right through ground turbulence give control need under conditions have trouble deciding whether build Osprey 900 flaps maybe can help Flaps require great deal practice before can use advantage camber angle attack change flaps actuated end result perfor mance depends center gravity location performance also squared pilots knowledge reactions show up instant move flaps cases tendency over-use flaps Whereas may take 20 flying hours learn new ship well will take minimum 40 hours master use flaps CONSTRUCTION Proper application various grades balsa will improve flight performance longevity structure example C-grain sheeting trailing edges will remain straight much longer period A-grain Wing ribs should also C-grain Use contest grade balsa except fuselage sides should use medium weight A-grain Sources information balsa wood application Sigs catalog Frank Zaics Model Glider Design library book John Kaufmann Flying Hand Launched Gliders terested learning about gliding flying models suggest also read Donald Footes book Aerodynamics Model Airplanes Continued page 110 18 Model Aviation entire installation revealed removal long hatch Well- protected receiver raised picturewhich explains perhaps mysterious drill Note ballast boxportion opening visible rightbutts against rear servo tray withstand impact An interesting point wing progressively thickens high point moves forwardno tip washout WWI MODEL ACCESSORIES FINE QUALITY MACHINE GUN KITS 4LLOzA5 iiLNc Osprey 900/Hayes continued page 18 Library Congress catalog card number 526339 Wing Start making three wing rib templates 1/32 plywood Cut templates plans glue plywood rubber cement Select 1/16 light C-grain balsa rib material Cut sand conform templates using stack method Use ribs through five make half ribs through D Lay sheeting plans cut shape straightedge Glue bottom spruce spar sheet ing white glue stick pins spar Cut trailing edge sheeting pin plans Glue bottom cap strips leading edge sheeting cyanoacrylate example Hot Stufi Use angle gauge glue root rib Glue ribs seven through 11 13 through 19 Number 12 rib omitted until polyhedral joint structured Cut glue white glue foreward 1/16 plywood spar web top bottom spars after installing top spar Ribs two through six cut half accom modate plywood spar webs Install WHEELS TS INGS SEND SOf FOR COMPLETE CATALOG DEPT MA S 181 PAWNEE STREET SAN MARCOS CALIFORNIA 9 ribs except rear portions ribs two through four Install ribs through D wing blade assembly tacked between spars Make sure flush against foreward plywood spar web Cut root rib tween spars allow bottom nylon blade jacket protrude / 16 beyond root rib plywood root cap will surround jacket rear pin tube also protrudes through plywood root cap Set wing half leading edge use epoxy mixed micro balloons fill around nylon boxes Use slow-curing epoxy Install rear plywood spar web rear portion rib ribs two through four Install rear alignment pin tube decided use 7/32 wing rod place blade assembly place two inner panels flat board raise both ends up 23/16 Install wing tubes tacking cyanoacrylate baking soda just enough keep tubes moving slide wing halves apart wing tubes should per fectly horizontal accomplished putting rod inside tubes before tack using sighting device horizontal building board Lay inboard tip panels flat surface Raise tip panel 1-Y4 Sand spars leading edge bottom sheeting necessary form good joint Glue plywood poly brace Cut rib 12 glue both pieces Cut glue 1/16 balsa braces bottom rear sheeting sides rib 12 Glue remaining balsa sheer webs Sand leading trailing edges ribs Lay top sheeting Washout built-in installing sheeting Prototype filly sheeted wings probably wasnt necessary Flaps spoilers option Add plywood root cap tip block Sand leading edge entry point 3/16 above bottom sheeting Mark entry point leading edge reference point sanding Leading edge round sharp Wet wing plan turn over construct left panel Stabilizer Cap-strip ribs leading trailing edge stock super-light weight Start rais ing front rear pieces above plan scrap Add tip block root cap now have outside framework Taper spruce spar shown glue Remove assembly cut cap strips over plans pairs Strips should bit over-sized due curving over spar Using cy anoacrylate glue cap strips frame structure held between knees proceed install cap strips top bottom simultaneously easy once get hang Touch joints regular glue Add plywood joiner braces root cap joiner tubes Drill holes plywood tubes first align dry sand off excess Use stabilizer horn proper wire tube alignment Add fairing blocks root sand entire structure Fin Cut out two fin sides 1/32 plywood Mark pivot hole rear pin plans drill Glue supporting frame sticks shown side Cut hinge slots spruce fin post install Note post extends below fin side Epoxy hinges back side post Cut brass pivot tub insert through pivot hole Add remaining plywood side fin usinz white glue sure have stabilizer horn inside supertrim arm clever little item will use modeler has need adjust servo has installed model arm makes servo totally adjustable length arm provides centering super trim arm features slip-proof interlocking teeth throughout super trim arm available fora wide variety servos sure specify servo ordering product review product review product review 110 Model Aviation ENGINE KITS & CYLINDERS product review product review product review Arm @ $1 982 sets Robart 310 N 5th Street St Charles IL 60174 fin brass pivot tube running through Before glue sets install stabilizer fin use square make sure stabilizer 90 degrees fin Adjust plywood fin side proper alignment Use clothes pins clamp side fin assembly Sand leading edge round Fuselage Cut fuse plans pin surface two 4 X 48 balsa sheets 1/16 thick Select wood carefully constant grain weight hardness two sheets stacked cut fuse sides using plans guide fuse height wing shoulder actually over four inches wide However because fuse corners rounded difference height will problem leave shortage top Cut opening center wing blade box drill hole rear wing pin tube Glue longerons verticals spruce rail vertical 1/16 balsa doublers nose Use ballast box door guide cutting fuse side install ballast box Cut out ballast box patterns Use epoxy install fuse Blind nuts installed Sig Lite ply side box after ply glued drilling holes ballast box door spruce simultaneously Epoxy blind nuts inside fuse Install wing-flap pushrod linkage top bottom sheeting Cut acceptance hole adjust able towhook Sig Lite ply Before gluing bottom add cross pieces blind nuts Sand canopy block fuse original two brass tubes through fuse rubber bands held wings passed through tubes Taper sides top bottom longerons starting four inches rear zero thickness end fuse Attach pushrod bottom hole stab horn cut exit slot rudder pushrod Install flap horn through 1/16 plywood bearing plates building flaps Line up fuse sides glue vertical tail post Make sure fin bottom touches longerons Add formers nose block rear alignment tube wing blade box Use slow-curing epoxy wing box tube have plenty time accurate ly position wing Covering Cover surfaces MonoKote Add color-keyed tape underside fuselage front protect fuse covering landing abra sions Cast Aumlnum K & 840 RJC Engine Mounts Drilled IC ppuO J55t bolt engine mount thats CatAlto 3045i Short Deem ... $6Ott CalMs 30f53 Long Beam 2 S75O new super quiet K&B 40 RIC muffler requireb no exhaust plugs fittinis adapters Muffler machmed fit exhaust stack cover exposed holes Just bolt on.thats Witl reduce noise tO 12 Oecbets tittte no mud rpms e canmtted interposing souttd waves Radi cal free ftom eopsnslon chamber angted btow eoha sot sway usetage sin easy attach provision pressure fitting s NOTE Also aveitsbte ENVA 2B 35 40 45 OS MAX 30 35 40 SUPSA TICKS 021 se 48 Add $100 ectra tsr abs. engines specify type Mounting strap end scam inctuded Dealers Distributors Invited Catalog No 305 Only 1395 Add $125 postage handling CA residents add 6% tax Flying Install radio equipment balance spar initial flights CG can set further back ready Keep towhook forward fiyst flight Remember wings will flex tow first indication too much line pressure will veering left right broken tow line first second ballast boxes hold approximately 11-ounce lead bar third box holds 16 ounces An eight-ounce bar used place 16-ounce bar medium winds have performed outside loops inverted pull outs vertical dives barrel rolls 900 Have fun Aerobatics WC/Lowe continued page 27 stein Ivan Kristensen Canada Gunter Hoppe West Germany Mark Radcliff USA Bruno Giezendanner Switzerland prelim scores showed Dave very slim lead over Wolfgang Ivan Gunter point apart very close leaders Mark about ten points back Ivan Gunter scant point ahead Bruno day finals arrived almost no wind finally Mark first up due luck draw fliers battling fairly strong winds three days great have ideal conditions finals So go finals calling Mark got off absolutely beautiful takeoff proceeded put gorgeous flights have ever seen him put landed fine applause ajob well done apparent set standard others follow Bruno followed good flight lesser score Dave now put super flight typical Dave Brown best took lead Ivan followed good flight quite up Ivans standards Gunter followed score now obviously pressing Mark very closely Wolfgang proceeded put highest scoring finals flight edged out Dave proved clinch world cham pionship him second rounds finals flights proved meaningless since no improved scores freshening breeze finals resulted some reordering contest standings As turned out Dave agoniz ingly slipped first second point judge would have done him Wolfgang moved second first Mark rocketed way fifth third proud Mark Gunter stayed fourth position Ivan slipped third fifth Bruno stayed sixth position Team positions determined scores preliminaries resulted US first again Italy second W Germany third Switzer land fourth Liechtenstein fifth So much joy some sorrow others individual team honors awards given flying site later festive banquet Johannesburg Civic Center can bet yours truly lump throat played national anthem presented us first place team trophy Obviously Dave disappointed barely missing first place handled very well can proud coming back strong real adversity Mark top world placing third made good vow place top three championship Dean also did extremely well considering adver sity could have easily placed top six except engine failure Wolfgang has now won two World Championships 75 79 joins Bruno Doc Brookes US honor championships ajoyful memor able occasion wife Clara Im sure rest attending oppor tunity renew old friendships make new ones tremendous experience seeing enjoying beautiful South Africa first time January1980 111 1/5 SCALE SIZE 80 WINGSPAN 1126 WING AR EA PRICE OhI0 Quiet Power Tatone Makes Easy
Edition: Model Aviation - 1980/01
Page Numbers: 14, 15, 16, 17, 18, 110, 111
Can new American balsa-framed FAI models beat European glass smoothies sensatior scratch-built has blowing everyone off courses major meets U Ray H designer 900 unpracticed eye sailpianes look fairly standardized mix hidden things tooled attain some very specific flight-performance goals evident will note both pictures sheen very smooth wing IT IS thing build sailplane manu factured kit quite another design build scratch Scratch building can defined ominous words boss What working hard peers calculator writing pad filled strange him numbers planfonn scribblings asks dividing everything 144 Scratch building also cutting own wing ribs learning mistakes ig noring negative comments about dream ship Needless say scratch building successful can satisfying aspect modeling recommend anyone looking way release creative moods Osprey 900 designed win FAI team selection program 100 inches wing span likely happen consistency effort questionable start As matter fact three Standard Class airplanes finished top twenty 900 did have fastest total time speed event turned 136 -140 144 order claim fame accomplished Pensacola wing loading 865 ounces empty flew speed task 1314 ounces Interestingly during second third day competition ship became subject tip stall flying slower required rudder trim As result kept adding nose weight Dropping first place end round three twelfth overall six-round contest gave lot think about during long drive home sus picions developed may have lost washout right maybe cool too wings built washout fully sheeted managed warp structure washout during Augnst must confess trouble keeping washout didnt remem ber check during contest Sure enough left wing flat right panel off just bit Thats living learning maiden flight occurred during January 1978 Ana Maria Island Florida its first speed run late April back home Indiana ship base B midway through turn nylon center box exploded allow ing wings conform average V anyones alphabet heard crash fortun ately didnt see may have width daughters eyelash between Mono Kote turf narrowly qualified Brandon Florida May quarter-final used Aquila hanging out garage since 1976 could have flown Detroit quarter-final Florida during January can understand family wanted return May During second trip Florida Osprey hospital recuperating new center boxes being milled aluminum nylon center box strong enough 14 Model Aviation FULL SIZE PLANS AVAILABLE SEE PAGE 128 What seemed first throw-away picturesa common situation construction featureswas included because its striking portrayal simplicity rugged construction Tail would toward leftnote wing blade center box wing-wire tube Fuselage sheeted four sides 1/16 very light 3/32 sheet balsa Protruding wire left visible portion wing-flap hom assembly Engages Goldberg horn shown top view wing plan Partially built fin showing mounting stabilizer control horneither ply shown Airtronics Hinges mount spruce post FAI speed task However very good normal thermal competition Upon return used 14in drill remove nylon box fuse replaced aluminum box wing blades removable center box eliminates slop wing joiner assembly Now looking down throat first Great Lakes contest LOFT weekend just three hours flight time Osprey During contest circuit became very apparent lot learn about monster January1980 15 ---~tI-1--_-if II 0 OSPREY 900 SESIGNED S GRASS SY RAY HAYES 1/16 light C-grain balsa ribs stack sanded using 1/32 ply tem plates Author considers variable cambered airfoil answer being managed carefully controlled use wing flapsfor example raising flaps produces semi-symmetrical section produces speed hence penetration Considerable comment article PLYWOOD RIBS AS SANDINGUP ELEVATORLI SLO nfl1 1A6 SHEET BALSA TOP SIDES BOTTOM A RIBS BETWEEN ARE SANDED 10 UNIFORM TAPER ALUM TUBING FOR WING HOLDING RUBBERS WING BLADE1/16 WiRE TO FLAP CENTER BOXHORN AND BELLCRAN ____________3/16 X 3/BSPRUCE RAILS FOUR SERVOSFRCtvI NOSE TO WING TE IN COCKPIT BALSA SHEET CANOPY OR SOFT BLOCK HOLLOWED TO CLEAR RECEIVER [v32][b-2-10-1-10]] 2][b-1-10-1-10]] LOCK DOWEL V16 PLYWOOD SERVO TRAY yB1 PLYWOOD 4l HARDWOOD NOSE BLOCK AIRITRONFCS NYROD THRU RIBS TO SPOILERS 1/8 LITE-PLY BALLAST BOX FROM NOSE 10 FROM SIG FORMER 5I/B LFrE PLYI/B PLY COVER 1/16 PLYWOOD CAP RIB @JER WING BLADE 1/16 PLYWOOD FRONT SPAR WEB 16 Model Aviation 1/4 SQ BALSA ALL RUDDER FRAMINGDOUBLED AV TIP AND TRAILING EDGE AIRITRONICS ELEVAlOR HORN 1/16 X 1/4 SPRUCE ON RODS OUT PLYWOOD WEBS POST STIFFENER V32PLYWOOD BUTT RIBI/32PLYW300 AND RIB WEBFIN SKIN3/16 SQ SPRUCE POST 1/4" BALSA BLOCKS 3/16 X 1/4 T E t4YOD r0 ELEVAlOR1/16 X V4CAP STRPS AS RIBS TOPAND BOTTOM OFSPAR 1A6ID TUBE FOR WING WIRE3A6 4 SPRUCE SPAR TAPERED 3A6 SQ SPRUCE ALL LONGERONS SAILPLANE ACC CO NYLON______ WING BLADE BEiWEEN SPARS 1/16 SHEET COVERS TE 1/16 PLYIAOD REARTOP AND BOlTOM SPAR WEB1/4 X 1/2 TAPERED BALSA REAR SPAR1A6X 1/4 CAPSTRIPS ON RIB TOPSAND BOTTOM V16 SHEET FLAP TOP TE SlOCK FORAND BOTTOM1/16 BALSA WEBS ON SPAR SPOILERFRONTS ONLY BALSA BLOCK TIPS I/16SHEET WEBS , / 1/4 SQ SPRUCE TOP SPARS 1/8 X 1/4 SPRUCE BOlTOM SPARS 1/8 X 1/4 SPARSV 16 BALSA SHEET POLY BRACETOP AND BOTTOM3/8 X 16 HARD 1/16 BALSA ALL RIBSFRONTAND B2KlOP & BOTTOMOF LEADING EDGEBALSA LETAPERED January1980 17 No big deal always interesting see arranges dihedral case outer panels Leading edge round sharp After sheeting laid plans cut shape straightedge struc tural members fall place Wing-blade assembly tacked between spars against forward plywood spar web Use angle gauge root rib created particularly amount ballast add under various conditions use flaps thing discovered has terrific thermaling ability fully ballasted wind gauge said 22 mph gusts 30 launched blue sky loaded cumulus clouds After couple minutes two-thirds launch height detected thermal part turned out went down wind got back up launch altitude whole new world hopped fragmented thermal another until nearly out sight mile down wind wanted rename Wind Machine flying 1314 per sq ft few days later high-pressure cell near zero wind condi tions launched full ballast box time club field thermalled like full scale Osprey migrating North take up housekeeping flying buddy Frank Wren couldnt believe way climbed out Fully loaded weighs 91 ounces 1978 competition come end felt fairly satisfied design second Osprey completed Ospreys 1979 performance good first overall Great Lakes RIG Soaring League Championship Circuit Weather condi tions varied nearly blow out Stars Sturgis Michigan overcast almost dead calm Soars Sod Farm 900 also blew everyone off speed course during LSF Tournament 1980 year will interesting FAI par ticipants us going out develop balsa-framed model will beat Europeans glass smoothies Lee Renaud working very hard area great success us including Lee have deep feeling national pride fully expect win back Worlds Team Championship 1981 have little knowledge slide rule aerodyna mics rely own experiments conducted over last four years first attempt FM team 1976 Osprey 100 580-sq thermal fixture also flaps met bitter end Base B during speed run semi-finals Osprey 900 will fold its wings speed run use once burnt de sign engineering concept better known will never happen again sheeted 900 used -in sq spruce spars top blade system absolutely rigid will allow wing flex during launch Jerry Mrlik taught us years ago Astro-Jeff Also blade assembly allows quarter-midget-type turns speed event Sheeting wings doesnt add significant weight proper wood used does take time am convinced makes dif ference believe top sheeting design should approximately inch behind airfoils high point probably has same effect fully sheeted wing Put stralghtedge chord-wise wing covering dropping below ribs between trailing edge rear top front sheeting 1/16 inch have modified airfoil Generally sag can eliminated wider top sheeting used front rear airfoil creation will fly extremely well heavily loaded yet float necessary 108% thick high point 40% chord root might walking middle controversy advocating fairly thick wing others advocating thin wings am trying solve Midwest problem high winds takes strong wings survive launch 20 mph winds gusts 30 airfoil performs well loaded up area performance means pen etration downwind flight believe just beginning see little daylight seach all-purpose airfoil semi-symmetrical airfoils use now showing us what can happen try some thing different Remember started undercambered Olympics progressed flat bot toms personally believe variable airfoil answer flaps reasons like flaps ability change airfoil flight Raising flaps produces semi-symmetrical airfoil produces speed means penetration center gravity pushed way back raised flaps will produce stab ility needed air becomes turbulent thermal Raised flaps also aid landing windy conditions will bore right through ground turbulence give control need under conditions have trouble deciding whether build Osprey 900 flaps maybe can help Flaps require great deal practice before can use advantage camber angle attack change flaps actuated end result perfor mance depends center gravity location performance also squared pilots knowledge reactions show up instant move flaps cases tendency over-use flaps Whereas may take 20 flying hours learn new ship well will take minimum 40 hours master use flaps CONSTRUCTION Proper application various grades balsa will improve flight performance longevity structure example C-grain sheeting trailing edges will remain straight much longer period A-grain Wing ribs should also C-grain Use contest grade balsa except fuselage sides should use medium weight A-grain Sources information balsa wood application Sigs catalog Frank Zaics Model Glider Design library book John Kaufmann Flying Hand Launched Gliders terested learning about gliding flying models suggest also read Donald Footes book Aerodynamics Model Airplanes Continued page 110 18 Model Aviation entire installation revealed removal long hatch Well- protected receiver raised picturewhich explains perhaps mysterious drill Note ballast boxportion opening visible rightbutts against rear servo tray withstand impact An interesting point wing progressively thickens high point moves forwardno tip washout WWI MODEL ACCESSORIES FINE QUALITY MACHINE GUN KITS 4LLOzA5 iiLNc Osprey 900/Hayes continued page 18 Library Congress catalog card number 526339 Wing Start making three wing rib templates 1/32 plywood Cut templates plans glue plywood rubber cement Select 1/16 light C-grain balsa rib material Cut sand conform templates using stack method Use ribs through five make half ribs through D Lay sheeting plans cut shape straightedge Glue bottom spruce spar sheet ing white glue stick pins spar Cut trailing edge sheeting pin plans Glue bottom cap strips leading edge sheeting cyanoacrylate example Hot Stufi Use angle gauge glue root rib Glue ribs seven through 11 13 through 19 Number 12 rib omitted until polyhedral joint structured Cut glue white glue foreward 1/16 plywood spar web top bottom spars after installing top spar Ribs two through six cut half accom modate plywood spar webs Install WHEELS TS INGS SEND SOf FOR COMPLETE CATALOG DEPT MA S 181 PAWNEE STREET SAN MARCOS CALIFORNIA 9 ribs except rear portions ribs two through four Install ribs through D wing blade assembly tacked between spars Make sure flush against foreward plywood spar web Cut root rib tween spars allow bottom nylon blade jacket protrude / 16 beyond root rib plywood root cap will surround jacket rear pin tube also protrudes through plywood root cap Set wing half leading edge use epoxy mixed micro balloons fill around nylon boxes Use slow-curing epoxy Install rear plywood spar web rear portion rib ribs two through four Install rear alignment pin tube decided use 7/32 wing rod place blade assembly place two inner panels flat board raise both ends up 23/16 Install wing tubes tacking cyanoacrylate baking soda just enough keep tubes moving slide wing halves apart wing tubes should per fectly horizontal accomplished putting rod inside tubes before tack using sighting device horizontal building board Lay inboard tip panels flat surface Raise tip panel 1-Y4 Sand spars leading edge bottom sheeting necessary form good joint Glue plywood poly brace Cut rib 12 glue both pieces Cut glue 1/16 balsa braces bottom rear sheeting sides rib 12 Glue remaining balsa sheer webs Sand leading trailing edges ribs Lay top sheeting Washout built-in installing sheeting Prototype filly sheeted wings probably wasnt necessary Flaps spoilers option Add plywood root cap tip block Sand leading edge entry point 3/16 above bottom sheeting Mark entry point leading edge reference point sanding Leading edge round sharp Wet wing plan turn over construct left panel Stabilizer Cap-strip ribs leading trailing edge stock super-light weight Start rais ing front rear pieces above plan scrap Add tip block root cap now have outside framework Taper spruce spar shown glue Remove assembly cut cap strips over plans pairs Strips should bit over-sized due curving over spar Using cy anoacrylate glue cap strips frame structure held between knees proceed install cap strips top bottom simultaneously easy once get hang Touch joints regular glue Add plywood joiner braces root cap joiner tubes Drill holes plywood tubes first align dry sand off excess Use stabilizer horn proper wire tube alignment Add fairing blocks root sand entire structure Fin Cut out two fin sides 1/32 plywood Mark pivot hole rear pin plans drill Glue supporting frame sticks shown side Cut hinge slots spruce fin post install Note post extends below fin side Epoxy hinges back side post Cut brass pivot tub insert through pivot hole Add remaining plywood side fin usinz white glue sure have stabilizer horn inside supertrim arm clever little item will use modeler has need adjust servo has installed model arm makes servo totally adjustable length arm provides centering super trim arm features slip-proof interlocking teeth throughout super trim arm available fora wide variety servos sure specify servo ordering product review product review product review 110 Model Aviation ENGINE KITS & CYLINDERS product review product review product review Arm @ $1 982 sets Robart 310 N 5th Street St Charles IL 60174 fin brass pivot tube running through Before glue sets install stabilizer fin use square make sure stabilizer 90 degrees fin Adjust plywood fin side proper alignment Use clothes pins clamp side fin assembly Sand leading edge round Fuselage Cut fuse plans pin surface two 4 X 48 balsa sheets 1/16 thick Select wood carefully constant grain weight hardness two sheets stacked cut fuse sides using plans guide fuse height wing shoulder actually over four inches wide However because fuse corners rounded difference height will problem leave shortage top Cut opening center wing blade box drill hole rear wing pin tube Glue longerons verticals spruce rail vertical 1/16 balsa doublers nose Use ballast box door guide cutting fuse side install ballast box Cut out ballast box patterns Use epoxy install fuse Blind nuts installed Sig Lite ply side box after ply glued drilling holes ballast box door spruce simultaneously Epoxy blind nuts inside fuse Install wing-flap pushrod linkage top bottom sheeting Cut acceptance hole adjust able towhook Sig Lite ply Before gluing bottom add cross pieces blind nuts Sand canopy block fuse original two brass tubes through fuse rubber bands held wings passed through tubes Taper sides top bottom longerons starting four inches rear zero thickness end fuse Attach pushrod bottom hole stab horn cut exit slot rudder pushrod Install flap horn through 1/16 plywood bearing plates building flaps Line up fuse sides glue vertical tail post Make sure fin bottom touches longerons Add formers nose block rear alignment tube wing blade box Use slow-curing epoxy wing box tube have plenty time accurate ly position wing Covering Cover surfaces MonoKote Add color-keyed tape underside fuselage front protect fuse covering landing abra sions Cast Aumlnum K & 840 RJC Engine Mounts Drilled IC ppuO J55t bolt engine mount thats CatAlto 3045i Short Deem ... $6Ott CalMs 30f53 Long Beam 2 S75O new super quiet K&B 40 RIC muffler requireb no exhaust plugs fittinis adapters Muffler machmed fit exhaust stack cover exposed holes Just bolt on.thats Witl reduce noise tO 12 Oecbets tittte no mud rpms e canmtted interposing souttd waves Radi cal free ftom eopsnslon chamber angted btow eoha sot sway usetage sin easy attach provision pressure fitting s NOTE Also aveitsbte ENVA 2B 35 40 45 OS MAX 30 35 40 SUPSA TICKS 021 se 48 Add $100 ectra tsr abs. engines specify type Mounting strap end scam inctuded Dealers Distributors Invited Catalog No 305 Only 1395 Add $125 postage handling CA residents add 6% tax Flying Install radio equipment balance spar initial flights CG can set further back ready Keep towhook forward fiyst flight Remember wings will flex tow first indication too much line pressure will veering left right broken tow line first second ballast boxes hold approximately 11-ounce lead bar third box holds 16 ounces An eight-ounce bar used place 16-ounce bar medium winds have performed outside loops inverted pull outs vertical dives barrel rolls 900 Have fun Aerobatics WC/Lowe continued page 27 stein Ivan Kristensen Canada Gunter Hoppe West Germany Mark Radcliff USA Bruno Giezendanner Switzerland prelim scores showed Dave very slim lead over Wolfgang Ivan Gunter point apart very close leaders Mark about ten points back Ivan Gunter scant point ahead Bruno day finals arrived almost no wind finally Mark first up due luck draw fliers battling fairly strong winds three days great have ideal conditions finals So go finals calling Mark got off absolutely beautiful takeoff proceeded put gorgeous flights have ever seen him put landed fine applause ajob well done apparent set standard others follow Bruno followed good flight lesser score Dave now put super flight typical Dave Brown best took lead Ivan followed good flight quite up Ivans standards Gunter followed score now obviously pressing Mark very closely Wolfgang proceeded put highest scoring finals flight edged out Dave proved clinch world cham pionship him second rounds finals flights proved meaningless since no improved scores freshening breeze finals resulted some reordering contest standings As turned out Dave agoniz ingly slipped first second point judge would have done him Wolfgang moved second first Mark rocketed way fifth third proud Mark Gunter stayed fourth position Ivan slipped third fifth Bruno stayed sixth position Team positions determined scores preliminaries resulted US first again Italy second W Germany third Switzer land fourth Liechtenstein fifth So much joy some sorrow others individual team honors awards given flying site later festive banquet Johannesburg Civic Center can bet yours truly lump throat played national anthem presented us first place team trophy Obviously Dave disappointed barely missing first place handled very well can proud coming back strong real adversity Mark top world placing third made good vow place top three championship Dean also did extremely well considering adver sity could have easily placed top six except engine failure Wolfgang has now won two World Championships 75 79 joins Bruno Doc Brookes US honor championships ajoyful memor able occasion wife Clara Im sure rest attending oppor tunity renew old friendships make new ones tremendous experience seeing enjoying beautiful South Africa first time January1980 111 1/5 SCALE SIZE 80 WINGSPAN 1126 WING AR EA PRICE OhI0 Quiet Power Tatone Makes Easy
Edition: Model Aviation - 1980/01
Page Numbers: 14, 15, 16, 17, 18, 110, 111
Can new American balsa-framed FAI models beat European glass smoothies sensatior scratch-built has blowing everyone off courses major meets U Ray H designer 900 unpracticed eye sailpianes look fairly standardized mix hidden things tooled attain some very specific flight-performance goals evident will note both pictures sheen very smooth wing IT IS thing build sailplane manu factured kit quite another design build scratch Scratch building can defined ominous words boss What working hard peers calculator writing pad filled strange him numbers planfonn scribblings asks dividing everything 144 Scratch building also cutting own wing ribs learning mistakes ig noring negative comments about dream ship Needless say scratch building successful can satisfying aspect modeling recommend anyone looking way release creative moods Osprey 900 designed win FAI team selection program 100 inches wing span likely happen consistency effort questionable start As matter fact three Standard Class airplanes finished top twenty 900 did have fastest total time speed event turned 136 -140 144 order claim fame accomplished Pensacola wing loading 865 ounces empty flew speed task 1314 ounces Interestingly during second third day competition ship became subject tip stall flying slower required rudder trim As result kept adding nose weight Dropping first place end round three twelfth overall six-round contest gave lot think about during long drive home sus picions developed may have lost washout right maybe cool too wings built washout fully sheeted managed warp structure washout during Augnst must confess trouble keeping washout didnt remem ber check during contest Sure enough left wing flat right panel off just bit Thats living learning maiden flight occurred during January 1978 Ana Maria Island Florida its first speed run late April back home Indiana ship base B midway through turn nylon center box exploded allow ing wings conform average V anyones alphabet heard crash fortun ately didnt see may have width daughters eyelash between Mono Kote turf narrowly qualified Brandon Florida May quarter-final used Aquila hanging out garage since 1976 could have flown Detroit quarter-final Florida during January can understand family wanted return May During second trip Florida Osprey hospital recuperating new center boxes being milled aluminum nylon center box strong enough 14 Model Aviation FULL SIZE PLANS AVAILABLE SEE PAGE 128 What seemed first throw-away picturesa common situation construction featureswas included because its striking portrayal simplicity rugged construction Tail would toward leftnote wing blade center box wing-wire tube Fuselage sheeted four sides 1/16 very light 3/32 sheet balsa Protruding wire left visible portion wing-flap hom assembly Engages Goldberg horn shown top view wing plan Partially built fin showing mounting stabilizer control horneither ply shown Airtronics Hinges mount spruce post FAI speed task However very good normal thermal competition Upon return used 14in drill remove nylon box fuse replaced aluminum box wing blades removable center box eliminates slop wing joiner assembly Now looking down throat first Great Lakes contest LOFT weekend just three hours flight time Osprey During contest circuit became very apparent lot learn about monster January1980 15 ---~tI-1--_-if II 0 OSPREY 900 SESIGNED S GRASS SY RAY HAYES 1/16 light C-grain balsa ribs stack sanded using 1/32 ply tem plates Author considers variable cambered airfoil answer being managed carefully controlled use wing flapsfor example raising flaps produces semi-symmetrical section produces speed hence penetration Considerable comment article PLYWOOD RIBS AS SANDINGUP ELEVATORLI SLO nfl1 1A6 SHEET BALSA TOP SIDES BOTTOM A RIBS BETWEEN ARE SANDED 10 UNIFORM TAPER ALUM TUBING FOR WING HOLDING RUBBERS WING BLADE1/16 WiRE TO FLAP CENTER BOXHORN AND BELLCRAN ____________3/16 X 3/BSPRUCE RAILS FOUR SERVOSFRCtvI NOSE TO WING TE IN COCKPIT BALSA SHEET CANOPY OR SOFT BLOCK HOLLOWED TO CLEAR RECEIVER [v32][b-2-10-1-10]] 2][b-1-10-1-10]] LOCK DOWEL V16 PLYWOOD SERVO TRAY yB1 PLYWOOD 4l HARDWOOD NOSE BLOCK AIRITRONFCS NYROD THRU RIBS TO SPOILERS 1/8 LITE-PLY BALLAST BOX FROM NOSE 10 FROM SIG FORMER 5I/B LFrE PLYI/B PLY COVER 1/16 PLYWOOD CAP RIB @JER WING BLADE 1/16 PLYWOOD FRONT SPAR WEB 16 Model Aviation 1/4 SQ BALSA ALL RUDDER FRAMINGDOUBLED AV TIP AND TRAILING EDGE AIRITRONICS ELEVAlOR HORN 1/16 X 1/4 SPRUCE ON RODS OUT PLYWOOD WEBS POST STIFFENER V32PLYWOOD BUTT RIBI/32PLYW300 AND RIB WEBFIN SKIN3/16 SQ SPRUCE POST 1/4" BALSA BLOCKS 3/16 X 1/4 T E t4YOD r0 ELEVAlOR1/16 X V4CAP STRPS AS RIBS TOPAND BOTTOM OFSPAR 1A6ID TUBE FOR WING WIRE3A6 4 SPRUCE SPAR TAPERED 3A6 SQ SPRUCE ALL LONGERONS SAILPLANE ACC CO NYLON______ WING BLADE BEiWEEN SPARS 1/16 SHEET COVERS TE 1/16 PLYIAOD REARTOP AND BOlTOM SPAR WEB1/4 X 1/2 TAPERED BALSA REAR SPAR1A6X 1/4 CAPSTRIPS ON RIB TOPSAND BOTTOM V16 SHEET FLAP TOP TE SlOCK FORAND BOTTOM1/16 BALSA WEBS ON SPAR SPOILERFRONTS ONLY BALSA BLOCK TIPS I/16SHEET WEBS , / 1/4 SQ SPRUCE TOP SPARS 1/8 X 1/4 SPRUCE BOlTOM SPARS 1/8 X 1/4 SPARSV 16 BALSA SHEET POLY BRACETOP AND BOTTOM3/8 X 16 HARD 1/16 BALSA ALL RIBSFRONTAND B2KlOP & BOTTOMOF LEADING EDGEBALSA LETAPERED January1980 17 No big deal always interesting see arranges dihedral case outer panels Leading edge round sharp After sheeting laid plans cut shape straightedge struc tural members fall place Wing-blade assembly tacked between spars against forward plywood spar web Use angle gauge root rib created particularly amount ballast add under various conditions use flaps thing discovered has terrific thermaling ability fully ballasted wind gauge said 22 mph gusts 30 launched blue sky loaded cumulus clouds After couple minutes two-thirds launch height detected thermal part turned out went down wind got back up launch altitude whole new world hopped fragmented thermal another until nearly out sight mile down wind wanted rename Wind Machine flying 1314 per sq ft few days later high-pressure cell near zero wind condi tions launched full ballast box time club field thermalled like full scale Osprey migrating North take up housekeeping flying buddy Frank Wren couldnt believe way climbed out Fully loaded weighs 91 ounces 1978 competition come end felt fairly satisfied design second Osprey completed Ospreys 1979 performance good first overall Great Lakes RIG Soaring League Championship Circuit Weather condi tions varied nearly blow out Stars Sturgis Michigan overcast almost dead calm Soars Sod Farm 900 also blew everyone off speed course during LSF Tournament 1980 year will interesting FAI par ticipants us going out develop balsa-framed model will beat Europeans glass smoothies Lee Renaud working very hard area great success us including Lee have deep feeling national pride fully expect win back Worlds Team Championship 1981 have little knowledge slide rule aerodyna mics rely own experiments conducted over last four years first attempt FM team 1976 Osprey 100 580-sq thermal fixture also flaps met bitter end Base B during speed run semi-finals Osprey 900 will fold its wings speed run use once burnt de sign engineering concept better known will never happen again sheeted 900 used -in sq spruce spars top blade system absolutely rigid will allow wing flex during launch Jerry Mrlik taught us years ago Astro-Jeff Also blade assembly allows quarter-midget-type turns speed event Sheeting wings doesnt add significant weight proper wood used does take time am convinced makes dif ference believe top sheeting design should approximately inch behind airfoils high point probably has same effect fully sheeted wing Put stralghtedge chord-wise wing covering dropping below ribs between trailing edge rear top front sheeting 1/16 inch have modified airfoil Generally sag can eliminated wider top sheeting used front rear airfoil creation will fly extremely well heavily loaded yet float necessary 108% thick high point 40% chord root might walking middle controversy advocating fairly thick wing others advocating thin wings am trying solve Midwest problem high winds takes strong wings survive launch 20 mph winds gusts 30 airfoil performs well loaded up area performance means pen etration downwind flight believe just beginning see little daylight seach all-purpose airfoil semi-symmetrical airfoils use now showing us what can happen try some thing different Remember started undercambered Olympics progressed flat bot toms personally believe variable airfoil answer flaps reasons like flaps ability change airfoil flight Raising flaps produces semi-symmetrical airfoil produces speed means penetration center gravity pushed way back raised flaps will produce stab ility needed air becomes turbulent thermal Raised flaps also aid landing windy conditions will bore right through ground turbulence give control need under conditions have trouble deciding whether build Osprey 900 flaps maybe can help Flaps require great deal practice before can use advantage camber angle attack change flaps actuated end result perfor mance depends center gravity location performance also squared pilots knowledge reactions show up instant move flaps cases tendency over-use flaps Whereas may take 20 flying hours learn new ship well will take minimum 40 hours master use flaps CONSTRUCTION Proper application various grades balsa will improve flight performance longevity structure example C-grain sheeting trailing edges will remain straight much longer period A-grain Wing ribs should also C-grain Use contest grade balsa except fuselage sides should use medium weight A-grain Sources information balsa wood application Sigs catalog Frank Zaics Model Glider Design library book John Kaufmann Flying Hand Launched Gliders terested learning about gliding flying models suggest also read Donald Footes book Aerodynamics Model Airplanes Continued page 110 18 Model Aviation entire installation revealed removal long hatch Well- protected receiver raised picturewhich explains perhaps mysterious drill Note ballast boxportion opening visible rightbutts against rear servo tray withstand impact An interesting point wing progressively thickens high point moves forwardno tip washout WWI MODEL ACCESSORIES FINE QUALITY MACHINE GUN KITS 4LLOzA5 iiLNc Osprey 900/Hayes continued page 18 Library Congress catalog card number 526339 Wing Start making three wing rib templates 1/32 plywood Cut templates plans glue plywood rubber cement Select 1/16 light C-grain balsa rib material Cut sand conform templates using stack method Use ribs through five make half ribs through D Lay sheeting plans cut shape straightedge Glue bottom spruce spar sheet ing white glue stick pins spar Cut trailing edge sheeting pin plans Glue bottom cap strips leading edge sheeting cyanoacrylate example Hot Stufi Use angle gauge glue root rib Glue ribs seven through 11 13 through 19 Number 12 rib omitted until polyhedral joint structured Cut glue white glue foreward 1/16 plywood spar web top bottom spars after installing top spar Ribs two through six cut half accom modate plywood spar webs Install WHEELS TS INGS SEND SOf FOR COMPLETE CATALOG DEPT MA S 181 PAWNEE STREET SAN MARCOS CALIFORNIA 9 ribs except rear portions ribs two through four Install ribs through D wing blade assembly tacked between spars Make sure flush against foreward plywood spar web Cut root rib tween spars allow bottom nylon blade jacket protrude / 16 beyond root rib plywood root cap will surround jacket rear pin tube also protrudes through plywood root cap Set wing half leading edge use epoxy mixed micro balloons fill around nylon boxes Use slow-curing epoxy Install rear plywood spar web rear portion rib ribs two through four Install rear alignment pin tube decided use 7/32 wing rod place blade assembly place two inner panels flat board raise both ends up 23/16 Install wing tubes tacking cyanoacrylate baking soda just enough keep tubes moving slide wing halves apart wing tubes should per fectly horizontal accomplished putting rod inside tubes before tack using sighting device horizontal building board Lay inboard tip panels flat surface Raise tip panel 1-Y4 Sand spars leading edge bottom sheeting necessary form good joint Glue plywood poly brace Cut rib 12 glue both pieces Cut glue 1/16 balsa braces bottom rear sheeting sides rib 12 Glue remaining balsa sheer webs Sand leading trailing edges ribs Lay top sheeting Washout built-in installing sheeting Prototype filly sheeted wings probably wasnt necessary Flaps spoilers option Add plywood root cap tip block Sand leading edge entry point 3/16 above bottom sheeting Mark entry point leading edge reference point sanding Leading edge round sharp Wet wing plan turn over construct left panel Stabilizer Cap-strip ribs leading trailing edge stock super-light weight Start rais ing front rear pieces above plan scrap Add tip block root cap now have outside framework Taper spruce spar shown glue Remove assembly cut cap strips over plans pairs Strips should bit over-sized due curving over spar Using cy anoacrylate glue cap strips frame structure held between knees proceed install cap strips top bottom simultaneously easy once get hang Touch joints regular glue Add plywood joiner braces root cap joiner tubes Drill holes plywood tubes first align dry sand off excess Use stabilizer horn proper wire tube alignment Add fairing blocks root sand entire structure Fin Cut out two fin sides 1/32 plywood Mark pivot hole rear pin plans drill Glue supporting frame sticks shown side Cut hinge slots spruce fin post install Note post extends below fin side Epoxy hinges back side post Cut brass pivot tub insert through pivot hole Add remaining plywood side fin usinz white glue sure have stabilizer horn inside supertrim arm clever little item will use modeler has need adjust servo has installed model arm makes servo totally adjustable length arm provides centering super trim arm features slip-proof interlocking teeth throughout super trim arm available fora wide variety servos sure specify servo ordering product review product review product review 110 Model Aviation ENGINE KITS & CYLINDERS product review product review product review Arm @ $1 982 sets Robart 310 N 5th Street St Charles IL 60174 fin brass pivot tube running through Before glue sets install stabilizer fin use square make sure stabilizer 90 degrees fin Adjust plywood fin side proper alignment Use clothes pins clamp side fin assembly Sand leading edge round Fuselage Cut fuse plans pin surface two 4 X 48 balsa sheets 1/16 thick Select wood carefully constant grain weight hardness two sheets stacked cut fuse sides using plans guide fuse height wing shoulder actually over four inches wide However because fuse corners rounded difference height will problem leave shortage top Cut opening center wing blade box drill hole rear wing pin tube Glue longerons verticals spruce rail vertical 1/16 balsa doublers nose Use ballast box door guide cutting fuse side install ballast box Cut out ballast box patterns Use epoxy install fuse Blind nuts installed Sig Lite ply side box after ply glued drilling holes ballast box door spruce simultaneously Epoxy blind nuts inside fuse Install wing-flap pushrod linkage top bottom sheeting Cut acceptance hole adjust able towhook Sig Lite ply Before gluing bottom add cross pieces blind nuts Sand canopy block fuse original two brass tubes through fuse rubber bands held wings passed through tubes Taper sides top bottom longerons starting four inches rear zero thickness end fuse Attach pushrod bottom hole stab horn cut exit slot rudder pushrod Install flap horn through 1/16 plywood bearing plates building flaps Line up fuse sides glue vertical tail post Make sure fin bottom touches longerons Add formers nose block rear alignment tube wing blade box Use slow-curing epoxy wing box tube have plenty time accurate ly position wing Covering Cover surfaces MonoKote Add color-keyed tape underside fuselage front protect fuse covering landing abra sions Cast Aumlnum K & 840 RJC Engine Mounts Drilled IC ppuO J55t bolt engine mount thats CatAlto 3045i Short Deem ... $6Ott CalMs 30f53 Long Beam 2 S75O new super quiet K&B 40 RIC muffler requireb no exhaust plugs fittinis adapters Muffler machmed fit exhaust stack cover exposed holes Just bolt on.thats Witl reduce noise tO 12 Oecbets tittte no mud rpms e canmtted interposing souttd waves Radi cal free ftom eopsnslon chamber angted btow eoha sot sway usetage sin easy attach provision pressure fitting s NOTE Also aveitsbte ENVA 2B 35 40 45 OS MAX 30 35 40 SUPSA TICKS 021 se 48 Add $100 ectra tsr abs. engines specify type Mounting strap end scam inctuded Dealers Distributors Invited Catalog No 305 Only 1395 Add $125 postage handling CA residents add 6% tax Flying Install radio equipment balance spar initial flights CG can set further back ready Keep towhook forward fiyst flight Remember wings will flex tow first indication too much line pressure will veering left right broken tow line first second ballast boxes hold approximately 11-ounce lead bar third box holds 16 ounces An eight-ounce bar used place 16-ounce bar medium winds have performed outside loops inverted pull outs vertical dives barrel rolls 900 Have fun Aerobatics WC/Lowe continued page 27 stein Ivan Kristensen Canada Gunter Hoppe West Germany Mark Radcliff USA Bruno Giezendanner Switzerland prelim scores showed Dave very slim lead over Wolfgang Ivan Gunter point apart very close leaders Mark about ten points back Ivan Gunter scant point ahead Bruno day finals arrived almost no wind finally Mark first up due luck draw fliers battling fairly strong winds three days great have ideal conditions finals So go finals calling Mark got off absolutely beautiful takeoff proceeded put gorgeous flights have ever seen him put landed fine applause ajob well done apparent set standard others follow Bruno followed good flight lesser score Dave now put super flight typical Dave Brown best took lead Ivan followed good flight quite up Ivans standards Gunter followed score now obviously pressing Mark very closely Wolfgang proceeded put highest scoring finals flight edged out Dave proved clinch world cham pionship him second rounds finals flights proved meaningless since no improved scores freshening breeze finals resulted some reordering contest standings As turned out Dave agoniz ingly slipped first second point judge would have done him Wolfgang moved second first Mark rocketed way fifth third proud Mark Gunter stayed fourth position Ivan slipped third fifth Bruno stayed sixth position Team positions determined scores preliminaries resulted US first again Italy second W Germany third Switzer land fourth Liechtenstein fifth So much joy some sorrow others individual team honors awards given flying site later festive banquet Johannesburg Civic Center can bet yours truly lump throat played national anthem presented us first place team trophy Obviously Dave disappointed barely missing first place handled very well can proud coming back strong real adversity Mark top world placing third made good vow place top three championship Dean also did extremely well considering adver sity could have easily placed top six except engine failure Wolfgang has now won two World Championships 75 79 joins Bruno Doc Brookes US honor championships ajoyful memor able occasion wife Clara Im sure rest attending oppor tunity renew old friendships make new ones tremendous experience seeing enjoying beautiful South Africa first time January1980 111 1/5 SCALE SIZE 80 WINGSPAN 1126 WING AR EA PRICE OhI0 Quiet Power Tatone Makes Easy
Edition: Model Aviation - 1980/01
Page Numbers: 14, 15, 16, 17, 18, 110, 111
Can new American balsa-framed FAI models beat European glass smoothies sensatior scratch-built has blowing everyone off courses major meets U Ray H designer 900 unpracticed eye sailpianes look fairly standardized mix hidden things tooled attain some very specific flight-performance goals evident will note both pictures sheen very smooth wing IT IS thing build sailplane manu factured kit quite another design build scratch Scratch building can defined ominous words boss What working hard peers calculator writing pad filled strange him numbers planfonn scribblings asks dividing everything 144 Scratch building also cutting own wing ribs learning mistakes ig noring negative comments about dream ship Needless say scratch building successful can satisfying aspect modeling recommend anyone looking way release creative moods Osprey 900 designed win FAI team selection program 100 inches wing span likely happen consistency effort questionable start As matter fact three Standard Class airplanes finished top twenty 900 did have fastest total time speed event turned 136 -140 144 order claim fame accomplished Pensacola wing loading 865 ounces empty flew speed task 1314 ounces Interestingly during second third day competition ship became subject tip stall flying slower required rudder trim As result kept adding nose weight Dropping first place end round three twelfth overall six-round contest gave lot think about during long drive home sus picions developed may have lost washout right maybe cool too wings built washout fully sheeted managed warp structure washout during Augnst must confess trouble keeping washout didnt remem ber check during contest Sure enough left wing flat right panel off just bit Thats living learning maiden flight occurred during January 1978 Ana Maria Island Florida its first speed run late April back home Indiana ship base B midway through turn nylon center box exploded allow ing wings conform average V anyones alphabet heard crash fortun ately didnt see may have width daughters eyelash between Mono Kote turf narrowly qualified Brandon Florida May quarter-final used Aquila hanging out garage since 1976 could have flown Detroit quarter-final Florida during January can understand family wanted return May During second trip Florida Osprey hospital recuperating new center boxes being milled aluminum nylon center box strong enough 14 Model Aviation FULL SIZE PLANS AVAILABLE SEE PAGE 128 What seemed first throw-away picturesa common situation construction featureswas included because its striking portrayal simplicity rugged construction Tail would toward leftnote wing blade center box wing-wire tube Fuselage sheeted four sides 1/16 very light 3/32 sheet balsa Protruding wire left visible portion wing-flap hom assembly Engages Goldberg horn shown top view wing plan Partially built fin showing mounting stabilizer control horneither ply shown Airtronics Hinges mount spruce post FAI speed task However very good normal thermal competition Upon return used 14in drill remove nylon box fuse replaced aluminum box wing blades removable center box eliminates slop wing joiner assembly Now looking down throat first Great Lakes contest LOFT weekend just three hours flight time Osprey During contest circuit became very apparent lot learn about monster January1980 15 ---~tI-1--_-if II 0 OSPREY 900 SESIGNED S GRASS SY RAY HAYES 1/16 light C-grain balsa ribs stack sanded using 1/32 ply tem plates Author considers variable cambered airfoil answer being managed carefully controlled use wing flapsfor example raising flaps produces semi-symmetrical section produces speed hence penetration Considerable comment article PLYWOOD RIBS AS SANDINGUP ELEVATORLI SLO nfl1 1A6 SHEET BALSA TOP SIDES BOTTOM A RIBS BETWEEN ARE SANDED 10 UNIFORM TAPER ALUM TUBING FOR WING HOLDING RUBBERS WING BLADE1/16 WiRE TO FLAP CENTER BOXHORN AND BELLCRAN ____________3/16 X 3/BSPRUCE RAILS FOUR SERVOSFRCtvI NOSE TO WING TE IN COCKPIT BALSA SHEET CANOPY OR SOFT BLOCK HOLLOWED TO CLEAR RECEIVER [v32][b-2-10-1-10]] 2][b-1-10-1-10]] LOCK DOWEL V16 PLYWOOD SERVO TRAY yB1 PLYWOOD 4l HARDWOOD NOSE BLOCK AIRITRONFCS NYROD THRU RIBS TO SPOILERS 1/8 LITE-PLY BALLAST BOX FROM NOSE 10 FROM SIG FORMER 5I/B LFrE PLYI/B PLY COVER 1/16 PLYWOOD CAP RIB @JER WING BLADE 1/16 PLYWOOD FRONT SPAR WEB 16 Model Aviation 1/4 SQ BALSA ALL RUDDER FRAMINGDOUBLED AV TIP AND TRAILING EDGE AIRITRONICS ELEVAlOR HORN 1/16 X 1/4 SPRUCE ON RODS OUT PLYWOOD WEBS POST STIFFENER V32PLYWOOD BUTT RIBI/32PLYW300 AND RIB WEBFIN SKIN3/16 SQ SPRUCE POST 1/4" BALSA BLOCKS 3/16 X 1/4 T E t4YOD r0 ELEVAlOR1/16 X V4CAP STRPS AS RIBS TOPAND BOTTOM OFSPAR 1A6ID TUBE FOR WING WIRE3A6 4 SPRUCE SPAR TAPERED 3A6 SQ SPRUCE ALL LONGERONS SAILPLANE ACC CO NYLON______ WING BLADE BEiWEEN SPARS 1/16 SHEET COVERS TE 1/16 PLYIAOD REARTOP AND BOlTOM SPAR WEB1/4 X 1/2 TAPERED BALSA REAR SPAR1A6X 1/4 CAPSTRIPS ON RIB TOPSAND BOTTOM V16 SHEET FLAP TOP TE SlOCK FORAND BOTTOM1/16 BALSA WEBS ON SPAR SPOILERFRONTS ONLY BALSA BLOCK TIPS I/16SHEET WEBS , / 1/4 SQ SPRUCE TOP SPARS 1/8 X 1/4 SPRUCE BOlTOM SPARS 1/8 X 1/4 SPARSV 16 BALSA SHEET POLY BRACETOP AND BOTTOM3/8 X 16 HARD 1/16 BALSA ALL RIBSFRONTAND B2KlOP & BOTTOMOF LEADING EDGEBALSA LETAPERED January1980 17 No big deal always interesting see arranges dihedral case outer panels Leading edge round sharp After sheeting laid plans cut shape straightedge struc tural members fall place Wing-blade assembly tacked between spars against forward plywood spar web Use angle gauge root rib created particularly amount ballast add under various conditions use flaps thing discovered has terrific thermaling ability fully ballasted wind gauge said 22 mph gusts 30 launched blue sky loaded cumulus clouds After couple minutes two-thirds launch height detected thermal part turned out went down wind got back up launch altitude whole new world hopped fragmented thermal another until nearly out sight mile down wind wanted rename Wind Machine flying 1314 per sq ft few days later high-pressure cell near zero wind condi tions launched full ballast box time club field thermalled like full scale Osprey migrating North take up housekeeping flying buddy Frank Wren couldnt believe way climbed out Fully loaded weighs 91 ounces 1978 competition come end felt fairly satisfied design second Osprey completed Ospreys 1979 performance good first overall Great Lakes RIG Soaring League Championship Circuit Weather condi tions varied nearly blow out Stars Sturgis Michigan overcast almost dead calm Soars Sod Farm 900 also blew everyone off speed course during LSF Tournament 1980 year will interesting FAI par ticipants us going out develop balsa-framed model will beat Europeans glass smoothies Lee Renaud working very hard area great success us including Lee have deep feeling national pride fully expect win back Worlds Team Championship 1981 have little knowledge slide rule aerodyna mics rely own experiments conducted over last four years first attempt FM team 1976 Osprey 100 580-sq thermal fixture also flaps met bitter end Base B during speed run semi-finals Osprey 900 will fold its wings speed run use once burnt de sign engineering concept better known will never happen again sheeted 900 used -in sq spruce spars top blade system absolutely rigid will allow wing flex during launch Jerry Mrlik taught us years ago Astro-Jeff Also blade assembly allows quarter-midget-type turns speed event Sheeting wings doesnt add significant weight proper wood used does take time am convinced makes dif ference believe top sheeting design should approximately inch behind airfoils high point probably has same effect fully sheeted wing Put stralghtedge chord-wise wing covering dropping below ribs between trailing edge rear top front sheeting 1/16 inch have modified airfoil Generally sag can eliminated wider top sheeting used front rear airfoil creation will fly extremely well heavily loaded yet float necessary 108% thick high point 40% chord root might walking middle controversy advocating fairly thick wing others advocating thin wings am trying solve Midwest problem high winds takes strong wings survive launch 20 mph winds gusts 30 airfoil performs well loaded up area performance means pen etration downwind flight believe just beginning see little daylight seach all-purpose airfoil semi-symmetrical airfoils use now showing us what can happen try some thing different Remember started undercambered Olympics progressed flat bot toms personally believe variable airfoil answer flaps reasons like flaps ability change airfoil flight Raising flaps produces semi-symmetrical airfoil produces speed means penetration center gravity pushed way back raised flaps will produce stab ility needed air becomes turbulent thermal Raised flaps also aid landing windy conditions will bore right through ground turbulence give control need under conditions have trouble deciding whether build Osprey 900 flaps maybe can help Flaps require great deal practice before can use advantage camber angle attack change flaps actuated end result perfor mance depends center gravity location performance also squared pilots knowledge reactions show up instant move flaps cases tendency over-use flaps Whereas may take 20 flying hours learn new ship well will take minimum 40 hours master use flaps CONSTRUCTION Proper application various grades balsa will improve flight performance longevity structure example C-grain sheeting trailing edges will remain straight much longer period A-grain Wing ribs should also C-grain Use contest grade balsa except fuselage sides should use medium weight A-grain Sources information balsa wood application Sigs catalog Frank Zaics Model Glider Design library book John Kaufmann Flying Hand Launched Gliders terested learning about gliding flying models suggest also read Donald Footes book Aerodynamics Model Airplanes Continued page 110 18 Model Aviation entire installation revealed removal long hatch Well- protected receiver raised picturewhich explains perhaps mysterious drill Note ballast boxportion opening visible rightbutts against rear servo tray withstand impact An interesting point wing progressively thickens high point moves forwardno tip washout WWI MODEL ACCESSORIES FINE QUALITY MACHINE GUN KITS 4LLOzA5 iiLNc Osprey 900/Hayes continued page 18 Library Congress catalog card number 526339 Wing Start making three wing rib templates 1/32 plywood Cut templates plans glue plywood rubber cement Select 1/16 light C-grain balsa rib material Cut sand conform templates using stack method Use ribs through five make half ribs through D Lay sheeting plans cut shape straightedge Glue bottom spruce spar sheet ing white glue stick pins spar Cut trailing edge sheeting pin plans Glue bottom cap strips leading edge sheeting cyanoacrylate example Hot Stufi Use angle gauge glue root rib Glue ribs seven through 11 13 through 19 Number 12 rib omitted until polyhedral joint structured Cut glue white glue foreward 1/16 plywood spar web top bottom spars after installing top spar Ribs two through six cut half accom modate plywood spar webs Install WHEELS TS INGS SEND SOf FOR COMPLETE CATALOG DEPT MA S 181 PAWNEE STREET SAN MARCOS CALIFORNIA 9 ribs except rear portions ribs two through four Install ribs through D wing blade assembly tacked between spars Make sure flush against foreward plywood spar web Cut root rib tween spars allow bottom nylon blade jacket protrude / 16 beyond root rib plywood root cap will surround jacket rear pin tube also protrudes through plywood root cap Set wing half leading edge use epoxy mixed micro balloons fill around nylon boxes Use slow-curing epoxy Install rear plywood spar web rear portion rib ribs two through four Install rear alignment pin tube decided use 7/32 wing rod place blade assembly place two inner panels flat board raise both ends up 23/16 Install wing tubes tacking cyanoacrylate baking soda just enough keep tubes moving slide wing halves apart wing tubes should per fectly horizontal accomplished putting rod inside tubes before tack using sighting device horizontal building board Lay inboard tip panels flat surface Raise tip panel 1-Y4 Sand spars leading edge bottom sheeting necessary form good joint Glue plywood poly brace Cut rib 12 glue both pieces Cut glue 1/16 balsa braces bottom rear sheeting sides rib 12 Glue remaining balsa sheer webs Sand leading trailing edges ribs Lay top sheeting Washout built-in installing sheeting Prototype filly sheeted wings probably wasnt necessary Flaps spoilers option Add plywood root cap tip block Sand leading edge entry point 3/16 above bottom sheeting Mark entry point leading edge reference point sanding Leading edge round sharp Wet wing plan turn over construct left panel Stabilizer Cap-strip ribs leading trailing edge stock super-light weight Start rais ing front rear pieces above plan scrap Add tip block root cap now have outside framework Taper spruce spar shown glue Remove assembly cut cap strips over plans pairs Strips should bit over-sized due curving over spar Using cy anoacrylate glue cap strips frame structure held between knees proceed install cap strips top bottom simultaneously easy once get hang Touch joints regular glue Add plywood joiner braces root cap joiner tubes Drill holes plywood tubes first align dry sand off excess Use stabilizer horn proper wire tube alignment Add fairing blocks root sand entire structure Fin Cut out two fin sides 1/32 plywood Mark pivot hole rear pin plans drill Glue supporting frame sticks shown side Cut hinge slots spruce fin post install Note post extends below fin side Epoxy hinges back side post Cut brass pivot tub insert through pivot hole Add remaining plywood side fin usinz white glue sure have stabilizer horn inside supertrim arm clever little item will use modeler has need adjust servo has installed model arm makes servo totally adjustable length arm provides centering super trim arm features slip-proof interlocking teeth throughout super trim arm available fora wide variety servos sure specify servo ordering product review product review product review 110 Model Aviation ENGINE KITS & CYLINDERS product review product review product review Arm @ $1 982 sets Robart 310 N 5th Street St Charles IL 60174 fin brass pivot tube running through Before glue sets install stabilizer fin use square make sure stabilizer 90 degrees fin Adjust plywood fin side proper alignment Use clothes pins clamp side fin assembly Sand leading edge round Fuselage Cut fuse plans pin surface two 4 X 48 balsa sheets 1/16 thick Select wood carefully constant grain weight hardness two sheets stacked cut fuse sides using plans guide fuse height wing shoulder actually over four inches wide However because fuse corners rounded difference height will problem leave shortage top Cut opening center wing blade box drill hole rear wing pin tube Glue longerons verticals spruce rail vertical 1/16 balsa doublers nose Use ballast box door guide cutting fuse side install ballast box Cut out ballast box patterns Use epoxy install fuse Blind nuts installed Sig Lite ply side box after ply glued drilling holes ballast box door spruce simultaneously Epoxy blind nuts inside fuse Install wing-flap pushrod linkage top bottom sheeting Cut acceptance hole adjust able towhook Sig Lite ply Before gluing bottom add cross pieces blind nuts Sand canopy block fuse original two brass tubes through fuse rubber bands held wings passed through tubes Taper sides top bottom longerons starting four inches rear zero thickness end fuse Attach pushrod bottom hole stab horn cut exit slot rudder pushrod Install flap horn through 1/16 plywood bearing plates building flaps Line up fuse sides glue vertical tail post Make sure fin bottom touches longerons Add formers nose block rear alignment tube wing blade box Use slow-curing epoxy wing box tube have plenty time accurate ly position wing Covering Cover surfaces MonoKote Add color-keyed tape underside fuselage front protect fuse covering landing abra sions Cast Aumlnum K & 840 RJC Engine Mounts Drilled IC ppuO J55t bolt engine mount thats CatAlto 3045i Short Deem ... $6Ott CalMs 30f53 Long Beam 2 S75O new super quiet K&B 40 RIC muffler requireb no exhaust plugs fittinis adapters Muffler machmed fit exhaust stack cover exposed holes Just bolt on.thats Witl reduce noise tO 12 Oecbets tittte no mud rpms e canmtted interposing souttd waves Radi cal free ftom eopsnslon chamber angted btow eoha sot sway usetage sin easy attach provision pressure fitting s NOTE Also aveitsbte ENVA 2B 35 40 45 OS MAX 30 35 40 SUPSA TICKS 021 se 48 Add $100 ectra tsr abs. engines specify type Mounting strap end scam inctuded Dealers Distributors Invited Catalog No 305 Only 1395 Add $125 postage handling CA residents add 6% tax Flying Install radio equipment balance spar initial flights CG can set further back ready Keep towhook forward fiyst flight Remember wings will flex tow first indication too much line pressure will veering left right broken tow line first second ballast boxes hold approximately 11-ounce lead bar third box holds 16 ounces An eight-ounce bar used place 16-ounce bar medium winds have performed outside loops inverted pull outs vertical dives barrel rolls 900 Have fun Aerobatics WC/Lowe continued page 27 stein Ivan Kristensen Canada Gunter Hoppe West Germany Mark Radcliff USA Bruno Giezendanner Switzerland prelim scores showed Dave very slim lead over Wolfgang Ivan Gunter point apart very close leaders Mark about ten points back Ivan Gunter scant point ahead Bruno day finals arrived almost no wind finally Mark first up due luck draw fliers battling fairly strong winds three days great have ideal conditions finals So go finals calling Mark got off absolutely beautiful takeoff proceeded put gorgeous flights have ever seen him put landed fine applause ajob well done apparent set standard others follow Bruno followed good flight lesser score Dave now put super flight typical Dave Brown best took lead Ivan followed good flight quite up Ivans standards Gunter followed score now obviously pressing Mark very closely Wolfgang proceeded put highest scoring finals flight edged out Dave proved clinch world cham pionship him second rounds finals flights proved meaningless since no improved scores freshening breeze finals resulted some reordering contest standings As turned out Dave agoniz ingly slipped first second point judge would have done him Wolfgang moved second first Mark rocketed way fifth third proud Mark Gunter stayed fourth position Ivan slipped third fifth Bruno stayed sixth position Team positions determined scores preliminaries resulted US first again Italy second W Germany third Switzer land fourth Liechtenstein fifth So much joy some sorrow others individual team honors awards given flying site later festive banquet Johannesburg Civic Center can bet yours truly lump throat played national anthem presented us first place team trophy Obviously Dave disappointed barely missing first place handled very well can proud coming back strong real adversity Mark top world placing third made good vow place top three championship Dean also did extremely well considering adver sity could have easily placed top six except engine failure Wolfgang has now won two World Championships 75 79 joins Bruno Doc Brookes US honor championships ajoyful memor able occasion wife Clara Im sure rest attending oppor tunity renew old friendships make new ones tremendous experience seeing enjoying beautiful South Africa first time January1980 111 1/5 SCALE SIZE 80 WINGSPAN 1126 WING AR EA PRICE OhI0 Quiet Power Tatone Makes Easy
Edition: Model Aviation - 1980/01
Page Numbers: 14, 15, 16, 17, 18, 110, 111
Can new American balsa-framed FAI models beat European glass smoothies sensatior scratch-built has blowing everyone off courses major meets U Ray H designer 900 unpracticed eye sailpianes look fairly standardized mix hidden things tooled attain some very specific flight-performance goals evident will note both pictures sheen very smooth wing IT IS thing build sailplane manu factured kit quite another design build scratch Scratch building can defined ominous words boss What working hard peers calculator writing pad filled strange him numbers planfonn scribblings asks dividing everything 144 Scratch building also cutting own wing ribs learning mistakes ig noring negative comments about dream ship Needless say scratch building successful can satisfying aspect modeling recommend anyone looking way release creative moods Osprey 900 designed win FAI team selection program 100 inches wing span likely happen consistency effort questionable start As matter fact three Standard Class airplanes finished top twenty 900 did have fastest total time speed event turned 136 -140 144 order claim fame accomplished Pensacola wing loading 865 ounces empty flew speed task 1314 ounces Interestingly during second third day competition ship became subject tip stall flying slower required rudder trim As result kept adding nose weight Dropping first place end round three twelfth overall six-round contest gave lot think about during long drive home sus picions developed may have lost washout right maybe cool too wings built washout fully sheeted managed warp structure washout during Augnst must confess trouble keeping washout didnt remem ber check during contest Sure enough left wing flat right panel off just bit Thats living learning maiden flight occurred during January 1978 Ana Maria Island Florida its first speed run late April back home Indiana ship base B midway through turn nylon center box exploded allow ing wings conform average V anyones alphabet heard crash fortun ately didnt see may have width daughters eyelash between Mono Kote turf narrowly qualified Brandon Florida May quarter-final used Aquila hanging out garage since 1976 could have flown Detroit quarter-final Florida during January can understand family wanted return May During second trip Florida Osprey hospital recuperating new center boxes being milled aluminum nylon center box strong enough 14 Model Aviation FULL SIZE PLANS AVAILABLE SEE PAGE 128 What seemed first throw-away picturesa common situation construction featureswas included because its striking portrayal simplicity rugged construction Tail would toward leftnote wing blade center box wing-wire tube Fuselage sheeted four sides 1/16 very light 3/32 sheet balsa Protruding wire left visible portion wing-flap hom assembly Engages Goldberg horn shown top view wing plan Partially built fin showing mounting stabilizer control horneither ply shown Airtronics Hinges mount spruce post FAI speed task However very good normal thermal competition Upon return used 14in drill remove nylon box fuse replaced aluminum box wing blades removable center box eliminates slop wing joiner assembly Now looking down throat first Great Lakes contest LOFT weekend just three hours flight time Osprey During contest circuit became very apparent lot learn about monster January1980 15 ---~tI-1--_-if II 0 OSPREY 900 SESIGNED S GRASS SY RAY HAYES 1/16 light C-grain balsa ribs stack sanded using 1/32 ply tem plates Author considers variable cambered airfoil answer being managed carefully controlled use wing flapsfor example raising flaps produces semi-symmetrical section produces speed hence penetration Considerable comment article PLYWOOD RIBS AS SANDINGUP ELEVATORLI SLO nfl1 1A6 SHEET BALSA TOP SIDES BOTTOM A RIBS BETWEEN ARE SANDED 10 UNIFORM TAPER ALUM TUBING FOR WING HOLDING RUBBERS WING BLADE1/16 WiRE TO FLAP CENTER BOXHORN AND BELLCRAN ____________3/16 X 3/BSPRUCE RAILS FOUR SERVOSFRCtvI NOSE TO WING TE IN COCKPIT BALSA SHEET CANOPY OR SOFT BLOCK HOLLOWED TO CLEAR RECEIVER [v32][b-2-10-1-10]] 2][b-1-10-1-10]] LOCK DOWEL V16 PLYWOOD SERVO TRAY yB1 PLYWOOD 4l HARDWOOD NOSE BLOCK AIRITRONFCS NYROD THRU RIBS TO SPOILERS 1/8 LITE-PLY BALLAST BOX FROM NOSE 10 FROM SIG FORMER 5I/B LFrE PLYI/B PLY COVER 1/16 PLYWOOD CAP RIB @JER WING BLADE 1/16 PLYWOOD FRONT SPAR WEB 16 Model Aviation 1/4 SQ BALSA ALL RUDDER FRAMINGDOUBLED AV TIP AND TRAILING EDGE AIRITRONICS ELEVAlOR HORN 1/16 X 1/4 SPRUCE ON RODS OUT PLYWOOD WEBS POST STIFFENER V32PLYWOOD BUTT RIBI/32PLYW300 AND RIB WEBFIN SKIN3/16 SQ SPRUCE POST 1/4" BALSA BLOCKS 3/16 X 1/4 T E t4YOD r0 ELEVAlOR1/16 X V4CAP STRPS AS RIBS TOPAND BOTTOM OFSPAR 1A6ID TUBE FOR WING WIRE3A6 4 SPRUCE SPAR TAPERED 3A6 SQ SPRUCE ALL LONGERONS SAILPLANE ACC CO NYLON______ WING BLADE BEiWEEN SPARS 1/16 SHEET COVERS TE 1/16 PLYIAOD REARTOP AND BOlTOM SPAR WEB1/4 X 1/2 TAPERED BALSA REAR SPAR1A6X 1/4 CAPSTRIPS ON RIB TOPSAND BOTTOM V16 SHEET FLAP TOP TE SlOCK FORAND BOTTOM1/16 BALSA WEBS ON SPAR SPOILERFRONTS ONLY BALSA BLOCK TIPS I/16SHEET WEBS , / 1/4 SQ SPRUCE TOP SPARS 1/8 X 1/4 SPRUCE BOlTOM SPARS 1/8 X 1/4 SPARSV 16 BALSA SHEET POLY BRACETOP AND BOTTOM3/8 X 16 HARD 1/16 BALSA ALL RIBSFRONTAND B2KlOP & BOTTOMOF LEADING EDGEBALSA LETAPERED January1980 17 No big deal always interesting see arranges dihedral case outer panels Leading edge round sharp After sheeting laid plans cut shape straightedge struc tural members fall place Wing-blade assembly tacked between spars against forward plywood spar web Use angle gauge root rib created particularly amount ballast add under various conditions use flaps thing discovered has terrific thermaling ability fully ballasted wind gauge said 22 mph gusts 30 launched blue sky loaded cumulus clouds After couple minutes two-thirds launch height detected thermal part turned out went down wind got back up launch altitude whole new world hopped fragmented thermal another until nearly out sight mile down wind wanted rename Wind Machine flying 1314 per sq ft few days later high-pressure cell near zero wind condi tions launched full ballast box time club field thermalled like full scale Osprey migrating North take up housekeeping flying buddy Frank Wren couldnt believe way climbed out Fully loaded weighs 91 ounces 1978 competition come end felt fairly satisfied design second Osprey completed Ospreys 1979 performance good first overall Great Lakes RIG Soaring League Championship Circuit Weather condi tions varied nearly blow out Stars Sturgis Michigan overcast almost dead calm Soars Sod Farm 900 also blew everyone off speed course during LSF Tournament 1980 year will interesting FAI par ticipants us going out develop balsa-framed model will beat Europeans glass smoothies Lee Renaud working very hard area great success us including Lee have deep feeling national pride fully expect win back Worlds Team Championship 1981 have little knowledge slide rule aerodyna mics rely own experiments conducted over last four years first attempt FM team 1976 Osprey 100 580-sq thermal fixture also flaps met bitter end Base B during speed run semi-finals Osprey 900 will fold its wings speed run use once burnt de sign engineering concept better known will never happen again sheeted 900 used -in sq spruce spars top blade system absolutely rigid will allow wing flex during launch Jerry Mrlik taught us years ago Astro-Jeff Also blade assembly allows quarter-midget-type turns speed event Sheeting wings doesnt add significant weight proper wood used does take time am convinced makes dif ference believe top sheeting design should approximately inch behind airfoils high point probably has same effect fully sheeted wing Put stralghtedge chord-wise wing covering dropping below ribs between trailing edge rear top front sheeting 1/16 inch have modified airfoil Generally sag can eliminated wider top sheeting used front rear airfoil creation will fly extremely well heavily loaded yet float necessary 108% thick high point 40% chord root might walking middle controversy advocating fairly thick wing others advocating thin wings am trying solve Midwest problem high winds takes strong wings survive launch 20 mph winds gusts 30 airfoil performs well loaded up area performance means pen etration downwind flight believe just beginning see little daylight seach all-purpose airfoil semi-symmetrical airfoils use now showing us what can happen try some thing different Remember started undercambered Olympics progressed flat bot toms personally believe variable airfoil answer flaps reasons like flaps ability change airfoil flight Raising flaps produces semi-symmetrical airfoil produces speed means penetration center gravity pushed way back raised flaps will produce stab ility needed air becomes turbulent thermal Raised flaps also aid landing windy conditions will bore right through ground turbulence give control need under conditions have trouble deciding whether build Osprey 900 flaps maybe can help Flaps require great deal practice before can use advantage camber angle attack change flaps actuated end result perfor mance depends center gravity location performance also squared pilots knowledge reactions show up instant move flaps cases tendency over-use flaps Whereas may take 20 flying hours learn new ship well will take minimum 40 hours master use flaps CONSTRUCTION Proper application various grades balsa will improve flight performance longevity structure example C-grain sheeting trailing edges will remain straight much longer period A-grain Wing ribs should also C-grain Use contest grade balsa except fuselage sides should use medium weight A-grain Sources information balsa wood application Sigs catalog Frank Zaics Model Glider Design library book John Kaufmann Flying Hand Launched Gliders terested learning about gliding flying models suggest also read Donald Footes book Aerodynamics Model Airplanes Continued page 110 18 Model Aviation entire installation revealed removal long hatch Well- protected receiver raised picturewhich explains perhaps mysterious drill Note ballast boxportion opening visible rightbutts against rear servo tray withstand impact An interesting point wing progressively thickens high point moves forwardno tip washout WWI MODEL ACCESSORIES FINE QUALITY MACHINE GUN KITS 4LLOzA5 iiLNc Osprey 900/Hayes continued page 18 Library Congress catalog card number 526339 Wing Start making three wing rib templates 1/32 plywood Cut templates plans glue plywood rubber cement Select 1/16 light C-grain balsa rib material Cut sand conform templates using stack method Use ribs through five make half ribs through D Lay sheeting plans cut shape straightedge Glue bottom spruce spar sheet ing white glue stick pins spar Cut trailing edge sheeting pin plans Glue bottom cap strips leading edge sheeting cyanoacrylate example Hot Stufi Use angle gauge glue root rib Glue ribs seven through 11 13 through 19 Number 12 rib omitted until polyhedral joint structured Cut glue white glue foreward 1/16 plywood spar web top bottom spars after installing top spar Ribs two through six cut half accom modate plywood spar webs Install WHEELS TS INGS SEND SOf FOR COMPLETE CATALOG DEPT MA S 181 PAWNEE STREET SAN MARCOS CALIFORNIA 9 ribs except rear portions ribs two through four Install ribs through D wing blade assembly tacked between spars Make sure flush against foreward plywood spar web Cut root rib tween spars allow bottom nylon blade jacket protrude / 16 beyond root rib plywood root cap will surround jacket rear pin tube also protrudes through plywood root cap Set wing half leading edge use epoxy mixed micro balloons fill around nylon boxes Use slow-curing epoxy Install rear plywood spar web rear portion rib ribs two through four Install rear alignment pin tube decided use 7/32 wing rod place blade assembly place two inner panels flat board raise both ends up 23/16 Install wing tubes tacking cyanoacrylate baking soda just enough keep tubes moving slide wing halves apart wing tubes should per fectly horizontal accomplished putting rod inside tubes before tack using sighting device horizontal building board Lay inboard tip panels flat surface Raise tip panel 1-Y4 Sand spars leading edge bottom sheeting necessary form good joint Glue plywood poly brace Cut rib 12 glue both pieces Cut glue 1/16 balsa braces bottom rear sheeting sides rib 12 Glue remaining balsa sheer webs Sand leading trailing edges ribs Lay top sheeting Washout built-in installing sheeting Prototype filly sheeted wings probably wasnt necessary Flaps spoilers option Add plywood root cap tip block Sand leading edge entry point 3/16 above bottom sheeting Mark entry point leading edge reference point sanding Leading edge round sharp Wet wing plan turn over construct left panel Stabilizer Cap-strip ribs leading trailing edge stock super-light weight Start rais ing front rear pieces above plan scrap Add tip block root cap now have outside framework Taper spruce spar shown glue Remove assembly cut cap strips over plans pairs Strips should bit over-sized due curving over spar Using cy anoacrylate glue cap strips frame structure held between knees proceed install cap strips top bottom simultaneously easy once get hang Touch joints regular glue Add plywood joiner braces root cap joiner tubes Drill holes plywood tubes first align dry sand off excess Use stabilizer horn proper wire tube alignment Add fairing blocks root sand entire structure Fin Cut out two fin sides 1/32 plywood Mark pivot hole rear pin plans drill Glue supporting frame sticks shown side Cut hinge slots spruce fin post install Note post extends below fin side Epoxy hinges back side post Cut brass pivot tub insert through pivot hole Add remaining plywood side fin usinz white glue sure have stabilizer horn inside supertrim arm clever little item will use modeler has need adjust servo has installed model arm makes servo totally adjustable length arm provides centering super trim arm features slip-proof interlocking teeth throughout super trim arm available fora wide variety servos sure specify servo ordering product review product review product review 110 Model Aviation ENGINE KITS & CYLINDERS product review product review product review Arm @ $1 982 sets Robart 310 N 5th Street St Charles IL 60174 fin brass pivot tube running through Before glue sets install stabilizer fin use square make sure stabilizer 90 degrees fin Adjust plywood fin side proper alignment Use clothes pins clamp side fin assembly Sand leading edge round Fuselage Cut fuse plans pin surface two 4 X 48 balsa sheets 1/16 thick Select wood carefully constant grain weight hardness two sheets stacked cut fuse sides using plans guide fuse height wing shoulder actually over four inches wide However because fuse corners rounded difference height will problem leave shortage top Cut opening center wing blade box drill hole rear wing pin tube Glue longerons verticals spruce rail vertical 1/16 balsa doublers nose Use ballast box door guide cutting fuse side install ballast box Cut out ballast box patterns Use epoxy install fuse Blind nuts installed Sig Lite ply side box after ply glued drilling holes ballast box door spruce simultaneously Epoxy blind nuts inside fuse Install wing-flap pushrod linkage top bottom sheeting Cut acceptance hole adjust able towhook Sig Lite ply Before gluing bottom add cross pieces blind nuts Sand canopy block fuse original two brass tubes through fuse rubber bands held wings passed through tubes Taper sides top bottom longerons starting four inches rear zero thickness end fuse Attach pushrod bottom hole stab horn cut exit slot rudder pushrod Install flap horn through 1/16 plywood bearing plates building flaps Line up fuse sides glue vertical tail post Make sure fin bottom touches longerons Add formers nose block rear alignment tube wing blade box Use slow-curing epoxy wing box tube have plenty time accurate ly position wing Covering Cover surfaces MonoKote Add color-keyed tape underside fuselage front protect fuse covering landing abra sions Cast Aumlnum K & 840 RJC Engine Mounts Drilled IC ppuO J55t bolt engine mount thats CatAlto 3045i Short Deem ... $6Ott CalMs 30f53 Long Beam 2 S75O new super quiet K&B 40 RIC muffler requireb no exhaust plugs fittinis adapters Muffler machmed fit exhaust stack cover exposed holes Just bolt on.thats Witl reduce noise tO 12 Oecbets tittte no mud rpms e canmtted interposing souttd waves Radi cal free ftom eopsnslon chamber angted btow eoha sot sway usetage sin easy attach provision pressure fitting s NOTE Also aveitsbte ENVA 2B 35 40 45 OS MAX 30 35 40 SUPSA TICKS 021 se 48 Add $100 ectra tsr abs. engines specify type Mounting strap end scam inctuded Dealers Distributors Invited Catalog No 305 Only 1395 Add $125 postage handling CA residents add 6% tax Flying Install radio equipment balance spar initial flights CG can set further back ready Keep towhook forward fiyst flight Remember wings will flex tow first indication too much line pressure will veering left right broken tow line first second ballast boxes hold approximately 11-ounce lead bar third box holds 16 ounces An eight-ounce bar used place 16-ounce bar medium winds have performed outside loops inverted pull outs vertical dives barrel rolls 900 Have fun Aerobatics WC/Lowe continued page 27 stein Ivan Kristensen Canada Gunter Hoppe West Germany Mark Radcliff USA Bruno Giezendanner Switzerland prelim scores showed Dave very slim lead over Wolfgang Ivan Gunter point apart very close leaders Mark about ten points back Ivan Gunter scant point ahead Bruno day finals arrived almost no wind finally Mark first up due luck draw fliers battling fairly strong winds three days great have ideal conditions finals So go finals calling Mark got off absolutely beautiful takeoff proceeded put gorgeous flights have ever seen him put landed fine applause ajob well done apparent set standard others follow Bruno followed good flight lesser score Dave now put super flight typical Dave Brown best took lead Ivan followed good flight quite up Ivans standards Gunter followed score now obviously pressing Mark very closely Wolfgang proceeded put highest scoring finals flight edged out Dave proved clinch world cham pionship him second rounds finals flights proved meaningless since no improved scores freshening breeze finals resulted some reordering contest standings As turned out Dave agoniz ingly slipped first second point judge would have done him Wolfgang moved second first Mark rocketed way fifth third proud Mark Gunter stayed fourth position Ivan slipped third fifth Bruno stayed sixth position Team positions determined scores preliminaries resulted US first again Italy second W Germany third Switzer land fourth Liechtenstein fifth So much joy some sorrow others individual team honors awards given flying site later festive banquet Johannesburg Civic Center can bet yours truly lump throat played national anthem presented us first place team trophy Obviously Dave disappointed barely missing first place handled very well can proud coming back strong real adversity Mark top world placing third made good vow place top three championship Dean also did extremely well considering adver sity could have easily placed top six except engine failure Wolfgang has now won two World Championships 75 79 joins Bruno Doc Brookes US honor championships ajoyful memor able occasion wife Clara Im sure rest attending oppor tunity renew old friendships make new ones tremendous experience seeing enjoying beautiful South Africa first time January1980 111 1/5 SCALE SIZE 80 WINGSPAN 1126 WING AR EA PRICE OhI0 Quiet Power Tatone Makes Easy
Edition: Model Aviation - 1980/01
Page Numbers: 14, 15, 16, 17, 18, 110, 111
Can new American balsa-framed FAI models beat European glass smoothies sensatior scratch-built has blowing everyone off courses major meets U Ray H designer 900 unpracticed eye sailpianes look fairly standardized mix hidden things tooled attain some very specific flight-performance goals evident will note both pictures sheen very smooth wing IT IS thing build sailplane manu factured kit quite another design build scratch Scratch building can defined ominous words boss What working hard peers calculator writing pad filled strange him numbers planfonn scribblings asks dividing everything 144 Scratch building also cutting own wing ribs learning mistakes ig noring negative comments about dream ship Needless say scratch building successful can satisfying aspect modeling recommend anyone looking way release creative moods Osprey 900 designed win FAI team selection program 100 inches wing span likely happen consistency effort questionable start As matter fact three Standard Class airplanes finished top twenty 900 did have fastest total time speed event turned 136 -140 144 order claim fame accomplished Pensacola wing loading 865 ounces empty flew speed task 1314 ounces Interestingly during second third day competition ship became subject tip stall flying slower required rudder trim As result kept adding nose weight Dropping first place end round three twelfth overall six-round contest gave lot think about during long drive home sus picions developed may have lost washout right maybe cool too wings built washout fully sheeted managed warp structure washout during Augnst must confess trouble keeping washout didnt remem ber check during contest Sure enough left wing flat right panel off just bit Thats living learning maiden flight occurred during January 1978 Ana Maria Island Florida its first speed run late April back home Indiana ship base B midway through turn nylon center box exploded allow ing wings conform average V anyones alphabet heard crash fortun ately didnt see may have width daughters eyelash between Mono Kote turf narrowly qualified Brandon Florida May quarter-final used Aquila hanging out garage since 1976 could have flown Detroit quarter-final Florida during January can understand family wanted return May During second trip Florida Osprey hospital recuperating new center boxes being milled aluminum nylon center box strong enough 14 Model Aviation FULL SIZE PLANS AVAILABLE SEE PAGE 128 What seemed first throw-away picturesa common situation construction featureswas included because its striking portrayal simplicity rugged construction Tail would toward leftnote wing blade center box wing-wire tube Fuselage sheeted four sides 1/16 very light 3/32 sheet balsa Protruding wire left visible portion wing-flap hom assembly Engages Goldberg horn shown top view wing plan Partially built fin showing mounting stabilizer control horneither ply shown Airtronics Hinges mount spruce post FAI speed task However very good normal thermal competition Upon return used 14in drill remove nylon box fuse replaced aluminum box wing blades removable center box eliminates slop wing joiner assembly Now looking down throat first Great Lakes contest LOFT weekend just three hours flight time Osprey During contest circuit became very apparent lot learn about monster January1980 15 ---~tI-1--_-if II 0 OSPREY 900 SESIGNED S GRASS SY RAY HAYES 1/16 light C-grain balsa ribs stack sanded using 1/32 ply tem plates Author considers variable cambered airfoil answer being managed carefully controlled use wing flapsfor example raising flaps produces semi-symmetrical section produces speed hence penetration Considerable comment article PLYWOOD RIBS AS SANDINGUP ELEVATORLI SLO nfl1 1A6 SHEET BALSA TOP SIDES BOTTOM A RIBS BETWEEN ARE SANDED 10 UNIFORM TAPER ALUM TUBING FOR WING HOLDING RUBBERS WING BLADE1/16 WiRE TO FLAP CENTER BOXHORN AND BELLCRAN ____________3/16 X 3/BSPRUCE RAILS FOUR SERVOSFRCtvI NOSE TO WING TE IN COCKPIT BALSA SHEET CANOPY OR SOFT BLOCK HOLLOWED TO CLEAR RECEIVER [v32][b-2-10-1-10]] 2][b-1-10-1-10]] LOCK DOWEL V16 PLYWOOD SERVO TRAY yB1 PLYWOOD 4l HARDWOOD NOSE BLOCK AIRITRONFCS NYROD THRU RIBS TO SPOILERS 1/8 LITE-PLY BALLAST BOX FROM NOSE 10 FROM SIG FORMER 5I/B LFrE PLYI/B PLY COVER 1/16 PLYWOOD CAP RIB @JER WING BLADE 1/16 PLYWOOD FRONT SPAR WEB 16 Model Aviation 1/4 SQ BALSA ALL RUDDER FRAMINGDOUBLED AV TIP AND TRAILING EDGE AIRITRONICS ELEVAlOR HORN 1/16 X 1/4 SPRUCE ON RODS OUT PLYWOOD WEBS POST STIFFENER V32PLYWOOD BUTT RIBI/32PLYW300 AND RIB WEBFIN SKIN3/16 SQ SPRUCE POST 1/4" BALSA BLOCKS 3/16 X 1/4 T E t4YOD r0 ELEVAlOR1/16 X V4CAP STRPS AS RIBS TOPAND BOTTOM OFSPAR 1A6ID TUBE FOR WING WIRE3A6 4 SPRUCE SPAR TAPERED 3A6 SQ SPRUCE ALL LONGERONS SAILPLANE ACC CO NYLON______ WING BLADE BEiWEEN SPARS 1/16 SHEET COVERS TE 1/16 PLYIAOD REARTOP AND BOlTOM SPAR WEB1/4 X 1/2 TAPERED BALSA REAR SPAR1A6X 1/4 CAPSTRIPS ON RIB TOPSAND BOTTOM V16 SHEET FLAP TOP TE SlOCK FORAND BOTTOM1/16 BALSA WEBS ON SPAR SPOILERFRONTS ONLY BALSA BLOCK TIPS I/16SHEET WEBS , / 1/4 SQ SPRUCE TOP SPARS 1/8 X 1/4 SPRUCE BOlTOM SPARS 1/8 X 1/4 SPARSV 16 BALSA SHEET POLY BRACETOP AND BOTTOM3/8 X 16 HARD 1/16 BALSA ALL RIBSFRONTAND B2KlOP & BOTTOMOF LEADING EDGEBALSA LETAPERED January1980 17 No big deal always interesting see arranges dihedral case outer panels Leading edge round sharp After sheeting laid plans cut shape straightedge struc tural members fall place Wing-blade assembly tacked between spars against forward plywood spar web Use angle gauge root rib created particularly amount ballast add under various conditions use flaps thing discovered has terrific thermaling ability fully ballasted wind gauge said 22 mph gusts 30 launched blue sky loaded cumulus clouds After couple minutes two-thirds launch height detected thermal part turned out went down wind got back up launch altitude whole new world hopped fragmented thermal another until nearly out sight mile down wind wanted rename Wind Machine flying 1314 per sq ft few days later high-pressure cell near zero wind condi tions launched full ballast box time club field thermalled like full scale Osprey migrating North take up housekeeping flying buddy Frank Wren couldnt believe way climbed out Fully loaded weighs 91 ounces 1978 competition come end felt fairly satisfied design second Osprey completed Ospreys 1979 performance good first overall Great Lakes RIG Soaring League Championship Circuit Weather condi tions varied nearly blow out Stars Sturgis Michigan overcast almost dead calm Soars Sod Farm 900 also blew everyone off speed course during LSF Tournament 1980 year will interesting FAI par ticipants us going out develop balsa-framed model will beat Europeans glass smoothies Lee Renaud working very hard area great success us including Lee have deep feeling national pride fully expect win back Worlds Team Championship 1981 have little knowledge slide rule aerodyna mics rely own experiments conducted over last four years first attempt FM team 1976 Osprey 100 580-sq thermal fixture also flaps met bitter end Base B during speed run semi-finals Osprey 900 will fold its wings speed run use once burnt de sign engineering concept better known will never happen again sheeted 900 used -in sq spruce spars top blade system absolutely rigid will allow wing flex during launch Jerry Mrlik taught us years ago Astro-Jeff Also blade assembly allows quarter-midget-type turns speed event Sheeting wings doesnt add significant weight proper wood used does take time am convinced makes dif ference believe top sheeting design should approximately inch behind airfoils high point probably has same effect fully sheeted wing Put stralghtedge chord-wise wing covering dropping below ribs between trailing edge rear top front sheeting 1/16 inch have modified airfoil Generally sag can eliminated wider top sheeting used front rear airfoil creation will fly extremely well heavily loaded yet float necessary 108% thick high point 40% chord root might walking middle controversy advocating fairly thick wing others advocating thin wings am trying solve Midwest problem high winds takes strong wings survive launch 20 mph winds gusts 30 airfoil performs well loaded up area performance means pen etration downwind flight believe just beginning see little daylight seach all-purpose airfoil semi-symmetrical airfoils use now showing us what can happen try some thing different Remember started undercambered Olympics progressed flat bot toms personally believe variable airfoil answer flaps reasons like flaps ability change airfoil flight Raising flaps produces semi-symmetrical airfoil produces speed means penetration center gravity pushed way back raised flaps will produce stab ility needed air becomes turbulent thermal Raised flaps also aid landing windy conditions will bore right through ground turbulence give control need under conditions have trouble deciding whether build Osprey 900 flaps maybe can help Flaps require great deal practice before can use advantage camber angle attack change flaps actuated end result perfor mance depends center gravity location performance also squared pilots knowledge reactions show up instant move flaps cases tendency over-use flaps Whereas may take 20 flying hours learn new ship well will take minimum 40 hours master use flaps CONSTRUCTION Proper application various grades balsa will improve flight performance longevity structure example C-grain sheeting trailing edges will remain straight much longer period A-grain Wing ribs should also C-grain Use contest grade balsa except fuselage sides should use medium weight A-grain Sources information balsa wood application Sigs catalog Frank Zaics Model Glider Design library book John Kaufmann Flying Hand Launched Gliders terested learning about gliding flying models suggest also read Donald Footes book Aerodynamics Model Airplanes Continued page 110 18 Model Aviation entire installation revealed removal long hatch Well- protected receiver raised picturewhich explains perhaps mysterious drill Note ballast boxportion opening visible rightbutts against rear servo tray withstand impact An interesting point wing progressively thickens high point moves forwardno tip washout WWI MODEL ACCESSORIES FINE QUALITY MACHINE GUN KITS 4LLOzA5 iiLNc Osprey 900/Hayes continued page 18 Library Congress catalog card number 526339 Wing Start making three wing rib templates 1/32 plywood Cut templates plans glue plywood rubber cement Select 1/16 light C-grain balsa rib material Cut sand conform templates using stack method Use ribs through five make half ribs through D Lay sheeting plans cut shape straightedge Glue bottom spruce spar sheet ing white glue stick pins spar Cut trailing edge sheeting pin plans Glue bottom cap strips leading edge sheeting cyanoacrylate example Hot Stufi Use angle gauge glue root rib Glue ribs seven through 11 13 through 19 Number 12 rib omitted until polyhedral joint structured Cut glue white glue foreward 1/16 plywood spar web top bottom spars after installing top spar Ribs two through six cut half accom modate plywood spar webs Install WHEELS TS INGS SEND SOf FOR COMPLETE CATALOG DEPT MA S 181 PAWNEE STREET SAN MARCOS CALIFORNIA 9 ribs except rear portions ribs two through four Install ribs through D wing blade assembly tacked between spars Make sure flush against foreward plywood spar web Cut root rib tween spars allow bottom nylon blade jacket protrude / 16 beyond root rib plywood root cap will surround jacket rear pin tube also protrudes through plywood root cap Set wing half leading edge use epoxy mixed micro balloons fill around nylon boxes Use slow-curing epoxy Install rear plywood spar web rear portion rib ribs two through four Install rear alignment pin tube decided use 7/32 wing rod place blade assembly place two inner panels flat board raise both ends up 23/16 Install wing tubes tacking cyanoacrylate baking soda just enough keep tubes moving slide wing halves apart wing tubes should per fectly horizontal accomplished putting rod inside tubes before tack using sighting device horizontal building board Lay inboard tip panels flat surface Raise tip panel 1-Y4 Sand spars leading edge bottom sheeting necessary form good joint Glue plywood poly brace Cut rib 12 glue both pieces Cut glue 1/16 balsa braces bottom rear sheeting sides rib 12 Glue remaining balsa sheer webs Sand leading trailing edges ribs Lay top sheeting Washout built-in installing sheeting Prototype filly sheeted wings probably wasnt necessary Flaps spoilers option Add plywood root cap tip block Sand leading edge entry point 3/16 above bottom sheeting Mark entry point leading edge reference point sanding Leading edge round sharp Wet wing plan turn over construct left panel Stabilizer Cap-strip ribs leading trailing edge stock super-light weight Start rais ing front rear pieces above plan scrap Add tip block root cap now have outside framework Taper spruce spar shown glue Remove assembly cut cap strips over plans pairs Strips should bit over-sized due curving over spar Using cy anoacrylate glue cap strips frame structure held between knees proceed install cap strips top bottom simultaneously easy once get hang Touch joints regular glue Add plywood joiner braces root cap joiner tubes Drill holes plywood tubes first align dry sand off excess Use stabilizer horn proper wire tube alignment Add fairing blocks root sand entire structure Fin Cut out two fin sides 1/32 plywood Mark pivot hole rear pin plans drill Glue supporting frame sticks shown side Cut hinge slots spruce fin post install Note post extends below fin side Epoxy hinges back side post Cut brass pivot tub insert through pivot hole Add remaining plywood side fin usinz white glue sure have stabilizer horn inside supertrim arm clever little item will use modeler has need adjust servo has installed model arm makes servo totally adjustable length arm provides centering super trim arm features slip-proof interlocking teeth throughout super trim arm available fora wide variety servos sure specify servo ordering product review product review product review 110 Model Aviation ENGINE KITS & CYLINDERS product review product review product review Arm @ $1 982 sets Robart 310 N 5th Street St Charles IL 60174 fin brass pivot tube running through Before glue sets install stabilizer fin use square make sure stabilizer 90 degrees fin Adjust plywood fin side proper alignment Use clothes pins clamp side fin assembly Sand leading edge round Fuselage Cut fuse plans pin surface two 4 X 48 balsa sheets 1/16 thick Select wood carefully constant grain weight hardness two sheets stacked cut fuse sides using plans guide fuse height wing shoulder actually over four inches wide However because fuse corners rounded difference height will problem leave shortage top Cut opening center wing blade box drill hole rear wing pin tube Glue longerons verticals spruce rail vertical 1/16 balsa doublers nose Use ballast box door guide cutting fuse side install ballast box Cut out ballast box patterns Use epoxy install fuse Blind nuts installed Sig Lite ply side box after ply glued drilling holes ballast box door spruce simultaneously Epoxy blind nuts inside fuse Install wing-flap pushrod linkage top bottom sheeting Cut acceptance hole adjust able towhook Sig Lite ply Before gluing bottom add cross pieces blind nuts Sand canopy block fuse original two brass tubes through fuse rubber bands held wings passed through tubes Taper sides top bottom longerons starting four inches rear zero thickness end fuse Attach pushrod bottom hole stab horn cut exit slot rudder pushrod Install flap horn through 1/16 plywood bearing plates building flaps Line up fuse sides glue vertical tail post Make sure fin bottom touches longerons Add formers nose block rear alignment tube wing blade box Use slow-curing epoxy wing box tube have plenty time accurate ly position wing Covering Cover surfaces MonoKote Add color-keyed tape underside fuselage front protect fuse covering landing abra sions Cast Aumlnum K & 840 RJC Engine Mounts Drilled IC ppuO J55t bolt engine mount thats CatAlto 3045i Short Deem ... $6Ott CalMs 30f53 Long Beam 2 S75O new super quiet K&B 40 RIC muffler requireb no exhaust plugs fittinis adapters Muffler machmed fit exhaust stack cover exposed holes Just bolt on.thats Witl reduce noise tO 12 Oecbets tittte no mud rpms e canmtted interposing souttd waves Radi cal free ftom eopsnslon chamber angted btow eoha sot sway usetage sin easy attach provision pressure fitting s NOTE Also aveitsbte ENVA 2B 35 40 45 OS MAX 30 35 40 SUPSA TICKS 021 se 48 Add $100 ectra tsr abs. engines specify type Mounting strap end scam inctuded Dealers Distributors Invited Catalog No 305 Only 1395 Add $125 postage handling CA residents add 6% tax Flying Install radio equipment balance spar initial flights CG can set further back ready Keep towhook forward fiyst flight Remember wings will flex tow first indication too much line pressure will veering left right broken tow line first second ballast boxes hold approximately 11-ounce lead bar third box holds 16 ounces An eight-ounce bar used place 16-ounce bar medium winds have performed outside loops inverted pull outs vertical dives barrel rolls 900 Have fun Aerobatics WC/Lowe continued page 27 stein Ivan Kristensen Canada Gunter Hoppe West Germany Mark Radcliff USA Bruno Giezendanner Switzerland prelim scores showed Dave very slim lead over Wolfgang Ivan Gunter point apart very close leaders Mark about ten points back Ivan Gunter scant point ahead Bruno day finals arrived almost no wind finally Mark first up due luck draw fliers battling fairly strong winds three days great have ideal conditions finals So go finals calling Mark got off absolutely beautiful takeoff proceeded put gorgeous flights have ever seen him put landed fine applause ajob well done apparent set standard others follow Bruno followed good flight lesser score Dave now put super flight typical Dave Brown best took lead Ivan followed good flight quite up Ivans standards Gunter followed score now obviously pressing Mark very closely Wolfgang proceeded put highest scoring finals flight edged out Dave proved clinch world cham pionship him second rounds finals flights proved meaningless since no improved scores freshening breeze finals resulted some reordering contest standings As turned out Dave agoniz ingly slipped first second point judge would have done him Wolfgang moved second first Mark rocketed way fifth third proud Mark Gunter stayed fourth position Ivan slipped third fifth Bruno stayed sixth position Team positions determined scores preliminaries resulted US first again Italy second W Germany third Switzer land fourth Liechtenstein fifth So much joy some sorrow others individual team honors awards given flying site later festive banquet Johannesburg Civic Center can bet yours truly lump throat played national anthem presented us first place team trophy Obviously Dave disappointed barely missing first place handled very well can proud coming back strong real adversity Mark top world placing third made good vow place top three championship Dean also did extremely well considering adver sity could have easily placed top six except engine failure Wolfgang has now won two World Championships 75 79 joins Bruno Doc Brookes US honor championships ajoyful memor able occasion wife Clara Im sure rest attending oppor tunity renew old friendships make new ones tremendous experience seeing enjoying beautiful South Africa first time January1980 111 1/5 SCALE SIZE 80 WINGSPAN 1126 WING AR EA PRICE OhI0 Quiet Power Tatone Makes Easy