Tj9jjjjIIJJlj/ FYf7 OFTHE FUTURE THIS article presents design concept vast array free flight duration applications could revolutionize configurations used concept giving overview competition free-flight events both concept its potential benefits hope indoors out basic idea behind varied solutions individual problems concept isnt new rather has developed will found thereby producing quickest two modifications make both evolution designs reliable improved alternative previous designs category modeling too Design Concept outdoor freelong search has perfect airfoil flight events powered either internal right combination moments article combustion engines twisted rubber motors suggests complete change underlying indoor outdoor hand-launch glider approach used design free-flight models optimum climb glide configurations events completely different power available Contained within article concepts todays engines rubber arms best main points details its first successful climb configuration holds model application free-flight design competition back least allowing climb nearly vertical hope success project ly other words design low drag highlighted will prompt others investigate climbs very near its zero lift trim point glide however ideal configuration will achieve low sink rate requiring low wing loadings operation high angles-of-attack should additionally noted highly cambered airfoils perform well high angles-ofattack very poorly during climb due high drag low angles-of-attack Therefore propose designing free flight planes much less compromise performance between phase flight use variable geometry Specifically approach propose fold wings airplane along chordwise hinge lines starting tip panel successive panel folds under see Fig 1 permits bottom surfaces adjoining panels mate resulting low-drag launch configuration Note innermost panel wing doesnt fold thus 44 Model Aviation leaving rigid stub provide necessary lift stability during launch Like previous folding wing concepts wing spring loaded hinges extended shape assumed restrained Unlike previous attempts fold ing wing models suggest use ofthe following two ideas 1 Fold wing once fold after first enclosing already folded panels cavity created wings undercamber implies use least modestly undercambered airfoils 2 Trigger openning wings based drop velocity model resulting reduction power due engine shut down rubber unwind impulsive nature handlaunch gliders launch triggering device should separate wing reduce load must withstand way fabricate such device attach small vane end arm pivoted other end arm preloaded pivot end hold vane forward glide position minimizing drag generating trim force desired preparing launch plane arm rotated 180 degrees lock retainers attached wing active control surface trapping next arms pivot See Fig 2 During launch vane generates lift force opposes mechanical preload thus keeping arm launch Illustrated Jim Newman Fig 1 musicgoesdownandaround. Arrows 1 2 3 steps type make obvious guess some hungry FAI fliersprobably among European guys seek clever technical edges may first exploit jump performance Picture javelin launching June 1980 45 2 Middle panel tip folds under 3 q ger locks panels 42 ausnor noiaing secono series tripie folding wing Indoor hand-launched gliders Left U-Trigger launch position Note opening covered mylar extending over holes fairing block Right 0-Trigger glide position Corresponding sketches Newman based Stans drawings help make clear photos taken Mike Stoy Top view hinge right wing tiphinge masking tape Rubber band causes wing openwire holds wing folded position being locked under 0-Trigger Condenser paper covers wedge removed clear finger rest Dont forget glider illustrates principle left isdiagramatic explanation similar photo 0-Trigger glide position Vr equal lessthan V Stall vane Right 0-Triggerin launch position also matches photo case Vr greater V Stall vane position long moments about pivot due lift force exceeds opposing mechan ical moment assure clean trip suggest design vane such stalls before lift-generated moment falls below magnitude mechanical moment After vane stalls arm swings forward releasing wings auto surfaces mechanism will referred q-trigger now article since q symbol dynamic pressure aerodynamics approach presented offers number advantages over fixed-geometry designs some accompany folding wing scheme others unique concept major advantages 1 The airfoil optimized both flight modes symmetrical semi-symmetrical during climb undercambered during glide 2 The frontal area wetted surface area reduced multiple fold system during climb resulting reduction drag 3 Structural weight can reduced due two factors load applied center section lower since reduced lift during launch lowers shear stress since distributed over shorter span also lowers bending induced stresses b folded sections need strong enough accommodate bending loads applied spring loading hinges glide lift forces since no aerodynamic loads applied during launch 4 The q-trigger being sensitive velocity changes allows wings opening and/or auto surfaces actuation based actual flight path launch predicted pattern fixed time Success Date point may wondering does really work often Let offer substantial evidence potential impact approach free-flight competition have built three triple-foldingwing indoor hand-launch gliders date shown photo three have worked almost flawlessly having credit over 200 flights date second competition design entered bettered national record stood eight years However doesnt tell whole story record Category II IHLG class allows use buildings up 100 feet high new record set building measuring 75 feet high high time 756 seconds obvious potential better performance under higher ceilings since glider hit roof ofthe 75-foot building number times Some preliminary conclusions can drawn currently documented performance design readers familiar state-of-the-art IHLG times 64-65 seconds exceptional site record set Therefore design has demonstrated 15% performance improvement Future opinion similar increases performance could realized other free-flight categories concept no substitute picking air outdoor events should provide advantage especially under dead-air conditions article dont mean imply designing folding wing models will easy since have demonstrated potential performance increase consistent operation least uncertainty surrounding project area should gone Let point out some problems feel need work 1 lightweight durable hinging method wing panels needs developed Presently plywood masking tape have proved Continued page 113 46 Model Aviation V Trigger pivots after vane stalls Retainers released Trapped RetaIners / / Spring / three modes possible powered free flight bottom throughflight path Launch mode wings folded during transition wings unfold glide mode Far out Heck did go moon didnt / / / J14 Different Approach/Stoy Continued page 46 successful models 2 A streamline method applying opening torque hinges must found Currently use rubber bands 3 A streamlined q-trigger can probably designed As new idea its eventual impact difficult predict approach become popular essential people begin win designs since competitive free flighters simply follow trends winning models feeling dont have time experiment readers have ability design successful models become convinced approach worthy efforts feel free flight can become exciting changing category over next few years want become involved building folding wing planes would interested discussing ideas problems Editors Note As competitionfreeflighters aware Stan Stoy has used principles achieve hand-launched glider times demonstrate great performance increase much first few people able believe possible power concept offers quantum jump performance although devel opment mechanics poses challengeper haps met Jim Newman did illustrations remarks forces FFship enormous witness flutter loss components year Ifeel wishful thinking expect very low forces involved Q FF Endurance/Meuser Continued page 49 after taping wing piece scrap plywood would imagine beginner might have bit problem sanding four sections separately getting airfoils match joints tendency would over-sand ends panels adjacent joints use large sanding block/2 x 3 x lOin minimumwould help heres thought works ol bumble thumbs should work anybody Tape four sections together joints using chordwise strips masking tape lower surface sanding wing piece sanding completed tape still attached apply glue choice opposing surfaces prop panels up proper angles smear glue oozes top joint nice fillet using finger let chemistry proceed tape bottom will keep excess glue running over town glue-skin reinforcement can added later elect sand wing panels separ ately masking-tape trick neat way make mitered joints recently read magazine about fine furniture Ive doing miterjoints way both fine furniture glider wings some 40 years didnt know other way price Super Chuck $4 plus $150 handling shipping per box box could contain several Super Chucks other Blue Ridge kits supplies intend ordering single Super Chuck might pay check Blue Ridge first address PO Box 429 Skyland NC 28776 library Im sure Bill Warner will present complete run-down Bill Hannans recently published book Peanut Power scale modelers point view Ill just say few things about general free flighters point view emphasis course Peanut Scale secondary emphasis other forms freeflight scale modeling sections construc tion covering props materials ground-support equipment flying forth handy trouble-shooting chart applicable small free-flight rubber-power model begin ning free fighter would find much value think beginner would better off starting something bit larger Peanut Scale such P-30 provided has access large enough flying field after seeing book might decide Peanut Scale branch freeflight hed like pursue price tag $795 makes comparable price four general interest ie 85% RC magazines hobby shop doesnt have yet can order directly publisher Historical Aviation Album PO Box 33 Temple City CA 91780 Include buck per order June 1980 113 mostly Bob Granville other members oftrigger securely latch panels anville family collectionwould favor folding concept conjunction good Seelig timer couple offorce multiplying levers latch wings indicative kind thinking may necessary turn brilliant concept practical reality Once happens things will never same Stan shows us vision confident cleverfreeflighters can turn physical reality After nota paper idea Stans work has brought us halfway down road begin some half-A sheet balsa things pot ofgold end rainbow 4 Bits Still winning B IG $4495 COMING SOON THE PROPHET2 meter sailplanedesugned Joe Ruth ADVANCER wth adi Dihedral fr am beginner expert single model airplane. Almost Ready Fly JAMMER cover Way $89 Ready Fly B 40 PRO LINE RADIO price S l CAP YOUR CLUB LOGO Great RC CIubsI Let Know Members Arel Low Minimum Reasonable Prices Good Servicel lnqu BCall Write pnted 500~TOP DOG SHIRTS4730 SW 75th Ave 7ixd~N\Miami FL 33155 ti1 S 13051 261 -7768 postage 6% tax California residents truly delightful book sort just plain fun own thumb through occasionally aside its information content Coot strikes again So whats new Im getting sick hearing about Coot its various wins records other great gliders Stoy boys have invented can hardly stand Coot Folder Wasp probably few Ive never heard Well turns out young Tom Croft upped Senior Category Indoor Hand Launch Glider record two-flight total 77 sec January 20 East St Louis using little 3gram Coot flights 386 384 sec temperature hall 56 means air density up bit normal could argue enhanced flight time lower sink rate degraded lower launch height glider almost hit rafters anyhow guess has low temperature enhanced performance Toms record just little shy Dan Belieffs Open record stood years same meet Coots co-designer Stan Stoy broke own previous Cat Open record two-flight score 844 sec healthy 24 sec over previous mark Drawings Coot appeared December OUR NEW SKY JAMMER selling faster can kit themso better order soon assured r U N SPECIFICATIONS SPAN50 LENGTH5-3 4 WEIGHT3-1 2 4 lbs ENGINE40 RADIO4 Channel DESIGNED FORSPORT FLYING Retail Price see DEALER order direct est . P0 Box 226 Bislies Az 85603 160214322328 1975 April 1978 issues Mode/Aviation NFFS Affairs might have noticed recent FF suppliers listing Marty Thompson wife Karen now handling NFFS Supplies having relieved Jose Maria Pinto job another switch Membership Department Kit Sonesen 8616 Maple Grove Ct. Sacramento CA 95828 has taken over membership management tasks Bill Booth has job past few years Join up Membership fees Age 19 andoverorresidents foreign countries $l0for year $18 two Age 18 under $525 year $950 two membership includes subscription Free Flight NFFS Digest subscriptions available membership recent issue Digest writing late Feb SeptemberNovember 1979 issue coveringthe World Champs think member did receive issue best check Kit Help know source good oldfashioned Banana Liquid Banana Oil would please let know about Id appreciate Editors note also known amyl acetate AMA Supply Services has recently offered its Airjacket patches Indoor World Champs coming West Baden offer following bumper sticker/jacket patch suggestion Indoor model ers bathtub bent coat-hangers Nats Unofficial Events Terry Rimert NFFS Official Unofficial-Events Director says will simply send him stamped self-addressed envelope hell send complete list rules Nats unofficial events have hunch hell toss three-views Pietenpol Air Camper suggests have floats planes bring along Nats perhaps theyll able find manu facture puddle Perryman will run hydro events much damp rag can found launch Added list unofficial events Oldtimer Rubber Scale Battle Britain rubber scale eventa mass-launch last-onedown-gets-the-marbles sort thing sponsored Cleveland Free Flight Society will probably Embryo Endurance event Buzzing BuLlards will host Flying Aces Club Scale Nats Aug 9 10 Im beginning think attend Nats Id have skip official stuff just fly fun Anyhow can learn about writing Terry Rimert 367 Orange Ave Baldwin FL 32334 Bob Meuser 4200 GregorTt Street Oakland CA 94619 FF Indoor/Tenny Con finued page 50 fastened securely inside box cannot move around other items inside box props accessories etc must also fastened down cannot puncture model cover ing details packing will vary model type models box Pay attention guys will quiz pass models reach VNART safely boxs size shape can determined number factors some totally unrelated models themselves example boxes carried frequently airliners can designed fit under scat overhead luggage carrier tactic requires advance knowledge dimensions available storage space Owners small car such VW may carefully plan biggest box can maneuvered through door rear seat safely extreme example European indoor flier removed both rear seat passenger seat car installed foam rubber padding across open spaces made long box carry several models open space behind drivers seat luggage space arrangement gave ample shock protection models spite occasional stretches very bumpy ruads price pald lonely trip models undamaged arrived World Championships Boxes take intercontinental trips must strong light Strong prevent being crushed light allow owner carry long distances sometimes found between various sections large intercontinental airports pointed out April column plexiglas panels should installed allow Customs inspectors see contents opening box less rigorous trips cardboard both very serviceable can quite adequate proper construc tion techniques first requirements shipping 114 Model Aviation AUDIO FLIGHT TIMER Prevents dead-stick landinas Generates incremental audio timing signals Ideal timing pattern flightsooass etc case less battery $2495$150shipping Less case mounts transmitter $2195 shipping Write free brochure Industrial Inventions Inc RD 2 463A US Roule 1 Monmouth Jct New Jersey 08852
Edition: Model Aviation - 1980/06
Page Numbers: 44, 45, 46, 113, 114
Tj9jjjjIIJJlj/ FYf7 OFTHE FUTURE THIS article presents design concept vast array free flight duration applications could revolutionize configurations used concept giving overview competition free-flight events both concept its potential benefits hope indoors out basic idea behind varied solutions individual problems concept isnt new rather has developed will found thereby producing quickest two modifications make both evolution designs reliable improved alternative previous designs category modeling too Design Concept outdoor freelong search has perfect airfoil flight events powered either internal right combination moments article combustion engines twisted rubber motors suggests complete change underlying indoor outdoor hand-launch glider approach used design free-flight models optimum climb glide configurations events completely different power available Contained within article concepts todays engines rubber arms best main points details its first successful climb configuration holds model application free-flight design competition back least allowing climb nearly vertical hope success project ly other words design low drag highlighted will prompt others investigate climbs very near its zero lift trim point glide however ideal configuration will achieve low sink rate requiring low wing loadings operation high angles-of-attack should additionally noted highly cambered airfoils perform well high angles-ofattack very poorly during climb due high drag low angles-of-attack Therefore propose designing free flight planes much less compromise performance between phase flight use variable geometry Specifically approach propose fold wings airplane along chordwise hinge lines starting tip panel successive panel folds under see Fig 1 permits bottom surfaces adjoining panels mate resulting low-drag launch configuration Note innermost panel wing doesnt fold thus 44 Model Aviation leaving rigid stub provide necessary lift stability during launch Like previous folding wing concepts wing spring loaded hinges extended shape assumed restrained Unlike previous attempts fold ing wing models suggest use ofthe following two ideas 1 Fold wing once fold after first enclosing already folded panels cavity created wings undercamber implies use least modestly undercambered airfoils 2 Trigger openning wings based drop velocity model resulting reduction power due engine shut down rubber unwind impulsive nature handlaunch gliders launch triggering device should separate wing reduce load must withstand way fabricate such device attach small vane end arm pivoted other end arm preloaded pivot end hold vane forward glide position minimizing drag generating trim force desired preparing launch plane arm rotated 180 degrees lock retainers attached wing active control surface trapping next arms pivot See Fig 2 During launch vane generates lift force opposes mechanical preload thus keeping arm launch Illustrated Jim Newman Fig 1 musicgoesdownandaround. Arrows 1 2 3 steps type make obvious guess some hungry FAI fliersprobably among European guys seek clever technical edges may first exploit jump performance Picture javelin launching June 1980 45 2 Middle panel tip folds under 3 q ger locks panels 42 ausnor noiaing secono series tripie folding wing Indoor hand-launched gliders Left U-Trigger launch position Note opening covered mylar extending over holes fairing block Right 0-Trigger glide position Corresponding sketches Newman based Stans drawings help make clear photos taken Mike Stoy Top view hinge right wing tiphinge masking tape Rubber band causes wing openwire holds wing folded position being locked under 0-Trigger Condenser paper covers wedge removed clear finger rest Dont forget glider illustrates principle left isdiagramatic explanation similar photo 0-Trigger glide position Vr equal lessthan V Stall vane Right 0-Triggerin launch position also matches photo case Vr greater V Stall vane position long moments about pivot due lift force exceeds opposing mechan ical moment assure clean trip suggest design vane such stalls before lift-generated moment falls below magnitude mechanical moment After vane stalls arm swings forward releasing wings auto surfaces mechanism will referred q-trigger now article since q symbol dynamic pressure aerodynamics approach presented offers number advantages over fixed-geometry designs some accompany folding wing scheme others unique concept major advantages 1 The airfoil optimized both flight modes symmetrical semi-symmetrical during climb undercambered during glide 2 The frontal area wetted surface area reduced multiple fold system during climb resulting reduction drag 3 Structural weight can reduced due two factors load applied center section lower since reduced lift during launch lowers shear stress since distributed over shorter span also lowers bending induced stresses b folded sections need strong enough accommodate bending loads applied spring loading hinges glide lift forces since no aerodynamic loads applied during launch 4 The q-trigger being sensitive velocity changes allows wings opening and/or auto surfaces actuation based actual flight path launch predicted pattern fixed time Success Date point may wondering does really work often Let offer substantial evidence potential impact approach free-flight competition have built three triple-foldingwing indoor hand-launch gliders date shown photo three have worked almost flawlessly having credit over 200 flights date second competition design entered bettered national record stood eight years However doesnt tell whole story record Category II IHLG class allows use buildings up 100 feet high new record set building measuring 75 feet high high time 756 seconds obvious potential better performance under higher ceilings since glider hit roof ofthe 75-foot building number times Some preliminary conclusions can drawn currently documented performance design readers familiar state-of-the-art IHLG times 64-65 seconds exceptional site record set Therefore design has demonstrated 15% performance improvement Future opinion similar increases performance could realized other free-flight categories concept no substitute picking air outdoor events should provide advantage especially under dead-air conditions article dont mean imply designing folding wing models will easy since have demonstrated potential performance increase consistent operation least uncertainty surrounding project area should gone Let point out some problems feel need work 1 lightweight durable hinging method wing panels needs developed Presently plywood masking tape have proved Continued page 113 46 Model Aviation V Trigger pivots after vane stalls Retainers released Trapped RetaIners / / Spring / three modes possible powered free flight bottom throughflight path Launch mode wings folded during transition wings unfold glide mode Far out Heck did go moon didnt / / / J14 Different Approach/Stoy Continued page 46 successful models 2 A streamline method applying opening torque hinges must found Currently use rubber bands 3 A streamlined q-trigger can probably designed As new idea its eventual impact difficult predict approach become popular essential people begin win designs since competitive free flighters simply follow trends winning models feeling dont have time experiment readers have ability design successful models become convinced approach worthy efforts feel free flight can become exciting changing category over next few years want become involved building folding wing planes would interested discussing ideas problems Editors Note As competitionfreeflighters aware Stan Stoy has used principles achieve hand-launched glider times demonstrate great performance increase much first few people able believe possible power concept offers quantum jump performance although devel opment mechanics poses challengeper haps met Jim Newman did illustrations remarks forces FFship enormous witness flutter loss components year Ifeel wishful thinking expect very low forces involved Q FF Endurance/Meuser Continued page 49 after taping wing piece scrap plywood would imagine beginner might have bit problem sanding four sections separately getting airfoils match joints tendency would over-sand ends panels adjacent joints use large sanding block/2 x 3 x lOin minimumwould help heres thought works ol bumble thumbs should work anybody Tape four sections together joints using chordwise strips masking tape lower surface sanding wing piece sanding completed tape still attached apply glue choice opposing surfaces prop panels up proper angles smear glue oozes top joint nice fillet using finger let chemistry proceed tape bottom will keep excess glue running over town glue-skin reinforcement can added later elect sand wing panels separ ately masking-tape trick neat way make mitered joints recently read magazine about fine furniture Ive doing miterjoints way both fine furniture glider wings some 40 years didnt know other way price Super Chuck $4 plus $150 handling shipping per box box could contain several Super Chucks other Blue Ridge kits supplies intend ordering single Super Chuck might pay check Blue Ridge first address PO Box 429 Skyland NC 28776 library Im sure Bill Warner will present complete run-down Bill Hannans recently published book Peanut Power scale modelers point view Ill just say few things about general free flighters point view emphasis course Peanut Scale secondary emphasis other forms freeflight scale modeling sections construc tion covering props materials ground-support equipment flying forth handy trouble-shooting chart applicable small free-flight rubber-power model begin ning free fighter would find much value think beginner would better off starting something bit larger Peanut Scale such P-30 provided has access large enough flying field after seeing book might decide Peanut Scale branch freeflight hed like pursue price tag $795 makes comparable price four general interest ie 85% RC magazines hobby shop doesnt have yet can order directly publisher Historical Aviation Album PO Box 33 Temple City CA 91780 Include buck per order June 1980 113 mostly Bob Granville other members oftrigger securely latch panels anville family collectionwould favor folding concept conjunction good Seelig timer couple offorce multiplying levers latch wings indicative kind thinking may necessary turn brilliant concept practical reality Once happens things will never same Stan shows us vision confident cleverfreeflighters can turn physical reality After nota paper idea Stans work has brought us halfway down road begin some half-A sheet balsa things pot ofgold end rainbow 4 Bits Still winning B IG $4495 COMING SOON THE PROPHET2 meter sailplanedesugned Joe Ruth ADVANCER wth adi Dihedral fr am beginner expert single model airplane. Almost Ready Fly JAMMER cover Way $89 Ready Fly B 40 PRO LINE RADIO price S l CAP YOUR CLUB LOGO Great RC CIubsI Let Know Members Arel Low Minimum Reasonable Prices Good Servicel lnqu BCall Write pnted 500~TOP DOG SHIRTS4730 SW 75th Ave 7ixd~N\Miami FL 33155 ti1 S 13051 261 -7768 postage 6% tax California residents truly delightful book sort just plain fun own thumb through occasionally aside its information content Coot strikes again So whats new Im getting sick hearing about Coot its various wins records other great gliders Stoy boys have invented can hardly stand Coot Folder Wasp probably few Ive never heard Well turns out young Tom Croft upped Senior Category Indoor Hand Launch Glider record two-flight total 77 sec January 20 East St Louis using little 3gram Coot flights 386 384 sec temperature hall 56 means air density up bit normal could argue enhanced flight time lower sink rate degraded lower launch height glider almost hit rafters anyhow guess has low temperature enhanced performance Toms record just little shy Dan Belieffs Open record stood years same meet Coots co-designer Stan Stoy broke own previous Cat Open record two-flight score 844 sec healthy 24 sec over previous mark Drawings Coot appeared December OUR NEW SKY JAMMER selling faster can kit themso better order soon assured r U N SPECIFICATIONS SPAN50 LENGTH5-3 4 WEIGHT3-1 2 4 lbs ENGINE40 RADIO4 Channel DESIGNED FORSPORT FLYING Retail Price see DEALER order direct est . P0 Box 226 Bislies Az 85603 160214322328 1975 April 1978 issues Mode/Aviation NFFS Affairs might have noticed recent FF suppliers listing Marty Thompson wife Karen now handling NFFS Supplies having relieved Jose Maria Pinto job another switch Membership Department Kit Sonesen 8616 Maple Grove Ct. Sacramento CA 95828 has taken over membership management tasks Bill Booth has job past few years Join up Membership fees Age 19 andoverorresidents foreign countries $l0for year $18 two Age 18 under $525 year $950 two membership includes subscription Free Flight NFFS Digest subscriptions available membership recent issue Digest writing late Feb SeptemberNovember 1979 issue coveringthe World Champs think member did receive issue best check Kit Help know source good oldfashioned Banana Liquid Banana Oil would please let know about Id appreciate Editors note also known amyl acetate AMA Supply Services has recently offered its Airjacket patches Indoor World Champs coming West Baden offer following bumper sticker/jacket patch suggestion Indoor model ers bathtub bent coat-hangers Nats Unofficial Events Terry Rimert NFFS Official Unofficial-Events Director says will simply send him stamped self-addressed envelope hell send complete list rules Nats unofficial events have hunch hell toss three-views Pietenpol Air Camper suggests have floats planes bring along Nats perhaps theyll able find manu facture puddle Perryman will run hydro events much damp rag can found launch Added list unofficial events Oldtimer Rubber Scale Battle Britain rubber scale eventa mass-launch last-onedown-gets-the-marbles sort thing sponsored Cleveland Free Flight Society will probably Embryo Endurance event Buzzing BuLlards will host Flying Aces Club Scale Nats Aug 9 10 Im beginning think attend Nats Id have skip official stuff just fly fun Anyhow can learn about writing Terry Rimert 367 Orange Ave Baldwin FL 32334 Bob Meuser 4200 GregorTt Street Oakland CA 94619 FF Indoor/Tenny Con finued page 50 fastened securely inside box cannot move around other items inside box props accessories etc must also fastened down cannot puncture model cover ing details packing will vary model type models box Pay attention guys will quiz pass models reach VNART safely boxs size shape can determined number factors some totally unrelated models themselves example boxes carried frequently airliners can designed fit under scat overhead luggage carrier tactic requires advance knowledge dimensions available storage space Owners small car such VW may carefully plan biggest box can maneuvered through door rear seat safely extreme example European indoor flier removed both rear seat passenger seat car installed foam rubber padding across open spaces made long box carry several models open space behind drivers seat luggage space arrangement gave ample shock protection models spite occasional stretches very bumpy ruads price pald lonely trip models undamaged arrived World Championships Boxes take intercontinental trips must strong light Strong prevent being crushed light allow owner carry long distances sometimes found between various sections large intercontinental airports pointed out April column plexiglas panels should installed allow Customs inspectors see contents opening box less rigorous trips cardboard both very serviceable can quite adequate proper construc tion techniques first requirements shipping 114 Model Aviation AUDIO FLIGHT TIMER Prevents dead-stick landinas Generates incremental audio timing signals Ideal timing pattern flightsooass etc case less battery $2495$150shipping Less case mounts transmitter $2195 shipping Write free brochure Industrial Inventions Inc RD 2 463A US Roule 1 Monmouth Jct New Jersey 08852
Edition: Model Aviation - 1980/06
Page Numbers: 44, 45, 46, 113, 114
Tj9jjjjIIJJlj/ FYf7 OFTHE FUTURE THIS article presents design concept vast array free flight duration applications could revolutionize configurations used concept giving overview competition free-flight events both concept its potential benefits hope indoors out basic idea behind varied solutions individual problems concept isnt new rather has developed will found thereby producing quickest two modifications make both evolution designs reliable improved alternative previous designs category modeling too Design Concept outdoor freelong search has perfect airfoil flight events powered either internal right combination moments article combustion engines twisted rubber motors suggests complete change underlying indoor outdoor hand-launch glider approach used design free-flight models optimum climb glide configurations events completely different power available Contained within article concepts todays engines rubber arms best main points details its first successful climb configuration holds model application free-flight design competition back least allowing climb nearly vertical hope success project ly other words design low drag highlighted will prompt others investigate climbs very near its zero lift trim point glide however ideal configuration will achieve low sink rate requiring low wing loadings operation high angles-of-attack should additionally noted highly cambered airfoils perform well high angles-ofattack very poorly during climb due high drag low angles-of-attack Therefore propose designing free flight planes much less compromise performance between phase flight use variable geometry Specifically approach propose fold wings airplane along chordwise hinge lines starting tip panel successive panel folds under see Fig 1 permits bottom surfaces adjoining panels mate resulting low-drag launch configuration Note innermost panel wing doesnt fold thus 44 Model Aviation leaving rigid stub provide necessary lift stability during launch Like previous folding wing concepts wing spring loaded hinges extended shape assumed restrained Unlike previous attempts fold ing wing models suggest use ofthe following two ideas 1 Fold wing once fold after first enclosing already folded panels cavity created wings undercamber implies use least modestly undercambered airfoils 2 Trigger openning wings based drop velocity model resulting reduction power due engine shut down rubber unwind impulsive nature handlaunch gliders launch triggering device should separate wing reduce load must withstand way fabricate such device attach small vane end arm pivoted other end arm preloaded pivot end hold vane forward glide position minimizing drag generating trim force desired preparing launch plane arm rotated 180 degrees lock retainers attached wing active control surface trapping next arms pivot See Fig 2 During launch vane generates lift force opposes mechanical preload thus keeping arm launch Illustrated Jim Newman Fig 1 musicgoesdownandaround. Arrows 1 2 3 steps type make obvious guess some hungry FAI fliersprobably among European guys seek clever technical edges may first exploit jump performance Picture javelin launching June 1980 45 2 Middle panel tip folds under 3 q ger locks panels 42 ausnor noiaing secono series tripie folding wing Indoor hand-launched gliders Left U-Trigger launch position Note opening covered mylar extending over holes fairing block Right 0-Trigger glide position Corresponding sketches Newman based Stans drawings help make clear photos taken Mike Stoy Top view hinge right wing tiphinge masking tape Rubber band causes wing openwire holds wing folded position being locked under 0-Trigger Condenser paper covers wedge removed clear finger rest Dont forget glider illustrates principle left isdiagramatic explanation similar photo 0-Trigger glide position Vr equal lessthan V Stall vane Right 0-Triggerin launch position also matches photo case Vr greater V Stall vane position long moments about pivot due lift force exceeds opposing mechan ical moment assure clean trip suggest design vane such stalls before lift-generated moment falls below magnitude mechanical moment After vane stalls arm swings forward releasing wings auto surfaces mechanism will referred q-trigger now article since q symbol dynamic pressure aerodynamics approach presented offers number advantages over fixed-geometry designs some accompany folding wing scheme others unique concept major advantages 1 The airfoil optimized both flight modes symmetrical semi-symmetrical during climb undercambered during glide 2 The frontal area wetted surface area reduced multiple fold system during climb resulting reduction drag 3 Structural weight can reduced due two factors load applied center section lower since reduced lift during launch lowers shear stress since distributed over shorter span also lowers bending induced stresses b folded sections need strong enough accommodate bending loads applied spring loading hinges glide lift forces since no aerodynamic loads applied during launch 4 The q-trigger being sensitive velocity changes allows wings opening and/or auto surfaces actuation based actual flight path launch predicted pattern fixed time Success Date point may wondering does really work often Let offer substantial evidence potential impact approach free-flight competition have built three triple-foldingwing indoor hand-launch gliders date shown photo three have worked almost flawlessly having credit over 200 flights date second competition design entered bettered national record stood eight years However doesnt tell whole story record Category II IHLG class allows use buildings up 100 feet high new record set building measuring 75 feet high high time 756 seconds obvious potential better performance under higher ceilings since glider hit roof ofthe 75-foot building number times Some preliminary conclusions can drawn currently documented performance design readers familiar state-of-the-art IHLG times 64-65 seconds exceptional site record set Therefore design has demonstrated 15% performance improvement Future opinion similar increases performance could realized other free-flight categories concept no substitute picking air outdoor events should provide advantage especially under dead-air conditions article dont mean imply designing folding wing models will easy since have demonstrated potential performance increase consistent operation least uncertainty surrounding project area should gone Let point out some problems feel need work 1 lightweight durable hinging method wing panels needs developed Presently plywood masking tape have proved Continued page 113 46 Model Aviation V Trigger pivots after vane stalls Retainers released Trapped RetaIners / / Spring / three modes possible powered free flight bottom throughflight path Launch mode wings folded during transition wings unfold glide mode Far out Heck did go moon didnt / / / J14 Different Approach/Stoy Continued page 46 successful models 2 A streamline method applying opening torque hinges must found Currently use rubber bands 3 A streamlined q-trigger can probably designed As new idea its eventual impact difficult predict approach become popular essential people begin win designs since competitive free flighters simply follow trends winning models feeling dont have time experiment readers have ability design successful models become convinced approach worthy efforts feel free flight can become exciting changing category over next few years want become involved building folding wing planes would interested discussing ideas problems Editors Note As competitionfreeflighters aware Stan Stoy has used principles achieve hand-launched glider times demonstrate great performance increase much first few people able believe possible power concept offers quantum jump performance although devel opment mechanics poses challengeper haps met Jim Newman did illustrations remarks forces FFship enormous witness flutter loss components year Ifeel wishful thinking expect very low forces involved Q FF Endurance/Meuser Continued page 49 after taping wing piece scrap plywood would imagine beginner might have bit problem sanding four sections separately getting airfoils match joints tendency would over-sand ends panels adjacent joints use large sanding block/2 x 3 x lOin minimumwould help heres thought works ol bumble thumbs should work anybody Tape four sections together joints using chordwise strips masking tape lower surface sanding wing piece sanding completed tape still attached apply glue choice opposing surfaces prop panels up proper angles smear glue oozes top joint nice fillet using finger let chemistry proceed tape bottom will keep excess glue running over town glue-skin reinforcement can added later elect sand wing panels separ ately masking-tape trick neat way make mitered joints recently read magazine about fine furniture Ive doing miterjoints way both fine furniture glider wings some 40 years didnt know other way price Super Chuck $4 plus $150 handling shipping per box box could contain several Super Chucks other Blue Ridge kits supplies intend ordering single Super Chuck might pay check Blue Ridge first address PO Box 429 Skyland NC 28776 library Im sure Bill Warner will present complete run-down Bill Hannans recently published book Peanut Power scale modelers point view Ill just say few things about general free flighters point view emphasis course Peanut Scale secondary emphasis other forms freeflight scale modeling sections construc tion covering props materials ground-support equipment flying forth handy trouble-shooting chart applicable small free-flight rubber-power model begin ning free fighter would find much value think beginner would better off starting something bit larger Peanut Scale such P-30 provided has access large enough flying field after seeing book might decide Peanut Scale branch freeflight hed like pursue price tag $795 makes comparable price four general interest ie 85% RC magazines hobby shop doesnt have yet can order directly publisher Historical Aviation Album PO Box 33 Temple City CA 91780 Include buck per order June 1980 113 mostly Bob Granville other members oftrigger securely latch panels anville family collectionwould favor folding concept conjunction good Seelig timer couple offorce multiplying levers latch wings indicative kind thinking may necessary turn brilliant concept practical reality Once happens things will never same Stan shows us vision confident cleverfreeflighters can turn physical reality After nota paper idea Stans work has brought us halfway down road begin some half-A sheet balsa things pot ofgold end rainbow 4 Bits Still winning B IG $4495 COMING SOON THE PROPHET2 meter sailplanedesugned Joe Ruth ADVANCER wth adi Dihedral fr am beginner expert single model airplane. Almost Ready Fly JAMMER cover Way $89 Ready Fly B 40 PRO LINE RADIO price S l CAP YOUR CLUB LOGO Great RC CIubsI Let Know Members Arel Low Minimum Reasonable Prices Good Servicel lnqu BCall Write pnted 500~TOP DOG SHIRTS4730 SW 75th Ave 7ixd~N\Miami FL 33155 ti1 S 13051 261 -7768 postage 6% tax California residents truly delightful book sort just plain fun own thumb through occasionally aside its information content Coot strikes again So whats new Im getting sick hearing about Coot its various wins records other great gliders Stoy boys have invented can hardly stand Coot Folder Wasp probably few Ive never heard Well turns out young Tom Croft upped Senior Category Indoor Hand Launch Glider record two-flight total 77 sec January 20 East St Louis using little 3gram Coot flights 386 384 sec temperature hall 56 means air density up bit normal could argue enhanced flight time lower sink rate degraded lower launch height glider almost hit rafters anyhow guess has low temperature enhanced performance Toms record just little shy Dan Belieffs Open record stood years same meet Coots co-designer Stan Stoy broke own previous Cat Open record two-flight score 844 sec healthy 24 sec over previous mark Drawings Coot appeared December OUR NEW SKY JAMMER selling faster can kit themso better order soon assured r U N SPECIFICATIONS SPAN50 LENGTH5-3 4 WEIGHT3-1 2 4 lbs ENGINE40 RADIO4 Channel DESIGNED FORSPORT FLYING Retail Price see DEALER order direct est . P0 Box 226 Bislies Az 85603 160214322328 1975 April 1978 issues Mode/Aviation NFFS Affairs might have noticed recent FF suppliers listing Marty Thompson wife Karen now handling NFFS Supplies having relieved Jose Maria Pinto job another switch Membership Department Kit Sonesen 8616 Maple Grove Ct. Sacramento CA 95828 has taken over membership management tasks Bill Booth has job past few years Join up Membership fees Age 19 andoverorresidents foreign countries $l0for year $18 two Age 18 under $525 year $950 two membership includes subscription Free Flight NFFS Digest subscriptions available membership recent issue Digest writing late Feb SeptemberNovember 1979 issue coveringthe World Champs think member did receive issue best check Kit Help know source good oldfashioned Banana Liquid Banana Oil would please let know about Id appreciate Editors note also known amyl acetate AMA Supply Services has recently offered its Airjacket patches Indoor World Champs coming West Baden offer following bumper sticker/jacket patch suggestion Indoor model ers bathtub bent coat-hangers Nats Unofficial Events Terry Rimert NFFS Official Unofficial-Events Director says will simply send him stamped self-addressed envelope hell send complete list rules Nats unofficial events have hunch hell toss three-views Pietenpol Air Camper suggests have floats planes bring along Nats perhaps theyll able find manu facture puddle Perryman will run hydro events much damp rag can found launch Added list unofficial events Oldtimer Rubber Scale Battle Britain rubber scale eventa mass-launch last-onedown-gets-the-marbles sort thing sponsored Cleveland Free Flight Society will probably Embryo Endurance event Buzzing BuLlards will host Flying Aces Club Scale Nats Aug 9 10 Im beginning think attend Nats Id have skip official stuff just fly fun Anyhow can learn about writing Terry Rimert 367 Orange Ave Baldwin FL 32334 Bob Meuser 4200 GregorTt Street Oakland CA 94619 FF Indoor/Tenny Con finued page 50 fastened securely inside box cannot move around other items inside box props accessories etc must also fastened down cannot puncture model cover ing details packing will vary model type models box Pay attention guys will quiz pass models reach VNART safely boxs size shape can determined number factors some totally unrelated models themselves example boxes carried frequently airliners can designed fit under scat overhead luggage carrier tactic requires advance knowledge dimensions available storage space Owners small car such VW may carefully plan biggest box can maneuvered through door rear seat safely extreme example European indoor flier removed both rear seat passenger seat car installed foam rubber padding across open spaces made long box carry several models open space behind drivers seat luggage space arrangement gave ample shock protection models spite occasional stretches very bumpy ruads price pald lonely trip models undamaged arrived World Championships Boxes take intercontinental trips must strong light Strong prevent being crushed light allow owner carry long distances sometimes found between various sections large intercontinental airports pointed out April column plexiglas panels should installed allow Customs inspectors see contents opening box less rigorous trips cardboard both very serviceable can quite adequate proper construc tion techniques first requirements shipping 114 Model Aviation AUDIO FLIGHT TIMER Prevents dead-stick landinas Generates incremental audio timing signals Ideal timing pattern flightsooass etc case less battery $2495$150shipping Less case mounts transmitter $2195 shipping Write free brochure Industrial Inventions Inc RD 2 463A US Roule 1 Monmouth Jct New Jersey 08852
Edition: Model Aviation - 1980/06
Page Numbers: 44, 45, 46, 113, 114
Tj9jjjjIIJJlj/ FYf7 OFTHE FUTURE THIS article presents design concept vast array free flight duration applications could revolutionize configurations used concept giving overview competition free-flight events both concept its potential benefits hope indoors out basic idea behind varied solutions individual problems concept isnt new rather has developed will found thereby producing quickest two modifications make both evolution designs reliable improved alternative previous designs category modeling too Design Concept outdoor freelong search has perfect airfoil flight events powered either internal right combination moments article combustion engines twisted rubber motors suggests complete change underlying indoor outdoor hand-launch glider approach used design free-flight models optimum climb glide configurations events completely different power available Contained within article concepts todays engines rubber arms best main points details its first successful climb configuration holds model application free-flight design competition back least allowing climb nearly vertical hope success project ly other words design low drag highlighted will prompt others investigate climbs very near its zero lift trim point glide however ideal configuration will achieve low sink rate requiring low wing loadings operation high angles-of-attack should additionally noted highly cambered airfoils perform well high angles-ofattack very poorly during climb due high drag low angles-of-attack Therefore propose designing free flight planes much less compromise performance between phase flight use variable geometry Specifically approach propose fold wings airplane along chordwise hinge lines starting tip panel successive panel folds under see Fig 1 permits bottom surfaces adjoining panels mate resulting low-drag launch configuration Note innermost panel wing doesnt fold thus 44 Model Aviation leaving rigid stub provide necessary lift stability during launch Like previous folding wing concepts wing spring loaded hinges extended shape assumed restrained Unlike previous attempts fold ing wing models suggest use ofthe following two ideas 1 Fold wing once fold after first enclosing already folded panels cavity created wings undercamber implies use least modestly undercambered airfoils 2 Trigger openning wings based drop velocity model resulting reduction power due engine shut down rubber unwind impulsive nature handlaunch gliders launch triggering device should separate wing reduce load must withstand way fabricate such device attach small vane end arm pivoted other end arm preloaded pivot end hold vane forward glide position minimizing drag generating trim force desired preparing launch plane arm rotated 180 degrees lock retainers attached wing active control surface trapping next arms pivot See Fig 2 During launch vane generates lift force opposes mechanical preload thus keeping arm launch Illustrated Jim Newman Fig 1 musicgoesdownandaround. Arrows 1 2 3 steps type make obvious guess some hungry FAI fliersprobably among European guys seek clever technical edges may first exploit jump performance Picture javelin launching June 1980 45 2 Middle panel tip folds under 3 q ger locks panels 42 ausnor noiaing secono series tripie folding wing Indoor hand-launched gliders Left U-Trigger launch position Note opening covered mylar extending over holes fairing block Right 0-Trigger glide position Corresponding sketches Newman based Stans drawings help make clear photos taken Mike Stoy Top view hinge right wing tiphinge masking tape Rubber band causes wing openwire holds wing folded position being locked under 0-Trigger Condenser paper covers wedge removed clear finger rest Dont forget glider illustrates principle left isdiagramatic explanation similar photo 0-Trigger glide position Vr equal lessthan V Stall vane Right 0-Triggerin launch position also matches photo case Vr greater V Stall vane position long moments about pivot due lift force exceeds opposing mechan ical moment assure clean trip suggest design vane such stalls before lift-generated moment falls below magnitude mechanical moment After vane stalls arm swings forward releasing wings auto surfaces mechanism will referred q-trigger now article since q symbol dynamic pressure aerodynamics approach presented offers number advantages over fixed-geometry designs some accompany folding wing scheme others unique concept major advantages 1 The airfoil optimized both flight modes symmetrical semi-symmetrical during climb undercambered during glide 2 The frontal area wetted surface area reduced multiple fold system during climb resulting reduction drag 3 Structural weight can reduced due two factors load applied center section lower since reduced lift during launch lowers shear stress since distributed over shorter span also lowers bending induced stresses b folded sections need strong enough accommodate bending loads applied spring loading hinges glide lift forces since no aerodynamic loads applied during launch 4 The q-trigger being sensitive velocity changes allows wings opening and/or auto surfaces actuation based actual flight path launch predicted pattern fixed time Success Date point may wondering does really work often Let offer substantial evidence potential impact approach free-flight competition have built three triple-foldingwing indoor hand-launch gliders date shown photo three have worked almost flawlessly having credit over 200 flights date second competition design entered bettered national record stood eight years However doesnt tell whole story record Category II IHLG class allows use buildings up 100 feet high new record set building measuring 75 feet high high time 756 seconds obvious potential better performance under higher ceilings since glider hit roof ofthe 75-foot building number times Some preliminary conclusions can drawn currently documented performance design readers familiar state-of-the-art IHLG times 64-65 seconds exceptional site record set Therefore design has demonstrated 15% performance improvement Future opinion similar increases performance could realized other free-flight categories concept no substitute picking air outdoor events should provide advantage especially under dead-air conditions article dont mean imply designing folding wing models will easy since have demonstrated potential performance increase consistent operation least uncertainty surrounding project area should gone Let point out some problems feel need work 1 lightweight durable hinging method wing panels needs developed Presently plywood masking tape have proved Continued page 113 46 Model Aviation V Trigger pivots after vane stalls Retainers released Trapped RetaIners / / Spring / three modes possible powered free flight bottom throughflight path Launch mode wings folded during transition wings unfold glide mode Far out Heck did go moon didnt / / / J14 Different Approach/Stoy Continued page 46 successful models 2 A streamline method applying opening torque hinges must found Currently use rubber bands 3 A streamlined q-trigger can probably designed As new idea its eventual impact difficult predict approach become popular essential people begin win designs since competitive free flighters simply follow trends winning models feeling dont have time experiment readers have ability design successful models become convinced approach worthy efforts feel free flight can become exciting changing category over next few years want become involved building folding wing planes would interested discussing ideas problems Editors Note As competitionfreeflighters aware Stan Stoy has used principles achieve hand-launched glider times demonstrate great performance increase much first few people able believe possible power concept offers quantum jump performance although devel opment mechanics poses challengeper haps met Jim Newman did illustrations remarks forces FFship enormous witness flutter loss components year Ifeel wishful thinking expect very low forces involved Q FF Endurance/Meuser Continued page 49 after taping wing piece scrap plywood would imagine beginner might have bit problem sanding four sections separately getting airfoils match joints tendency would over-sand ends panels adjacent joints use large sanding block/2 x 3 x lOin minimumwould help heres thought works ol bumble thumbs should work anybody Tape four sections together joints using chordwise strips masking tape lower surface sanding wing piece sanding completed tape still attached apply glue choice opposing surfaces prop panels up proper angles smear glue oozes top joint nice fillet using finger let chemistry proceed tape bottom will keep excess glue running over town glue-skin reinforcement can added later elect sand wing panels separ ately masking-tape trick neat way make mitered joints recently read magazine about fine furniture Ive doing miterjoints way both fine furniture glider wings some 40 years didnt know other way price Super Chuck $4 plus $150 handling shipping per box box could contain several Super Chucks other Blue Ridge kits supplies intend ordering single Super Chuck might pay check Blue Ridge first address PO Box 429 Skyland NC 28776 library Im sure Bill Warner will present complete run-down Bill Hannans recently published book Peanut Power scale modelers point view Ill just say few things about general free flighters point view emphasis course Peanut Scale secondary emphasis other forms freeflight scale modeling sections construc tion covering props materials ground-support equipment flying forth handy trouble-shooting chart applicable small free-flight rubber-power model begin ning free fighter would find much value think beginner would better off starting something bit larger Peanut Scale such P-30 provided has access large enough flying field after seeing book might decide Peanut Scale branch freeflight hed like pursue price tag $795 makes comparable price four general interest ie 85% RC magazines hobby shop doesnt have yet can order directly publisher Historical Aviation Album PO Box 33 Temple City CA 91780 Include buck per order June 1980 113 mostly Bob Granville other members oftrigger securely latch panels anville family collectionwould favor folding concept conjunction good Seelig timer couple offorce multiplying levers latch wings indicative kind thinking may necessary turn brilliant concept practical reality Once happens things will never same Stan shows us vision confident cleverfreeflighters can turn physical reality After nota paper idea Stans work has brought us halfway down road begin some half-A sheet balsa things pot ofgold end rainbow 4 Bits Still winning B IG $4495 COMING SOON THE PROPHET2 meter sailplanedesugned Joe Ruth ADVANCER wth adi Dihedral fr am beginner expert single model airplane. Almost Ready Fly JAMMER cover Way $89 Ready Fly B 40 PRO LINE RADIO price S l CAP YOUR CLUB LOGO Great RC CIubsI Let Know Members Arel Low Minimum Reasonable Prices Good Servicel lnqu BCall Write pnted 500~TOP DOG SHIRTS4730 SW 75th Ave 7ixd~N\Miami FL 33155 ti1 S 13051 261 -7768 postage 6% tax California residents truly delightful book sort just plain fun own thumb through occasionally aside its information content Coot strikes again So whats new Im getting sick hearing about Coot its various wins records other great gliders Stoy boys have invented can hardly stand Coot Folder Wasp probably few Ive never heard Well turns out young Tom Croft upped Senior Category Indoor Hand Launch Glider record two-flight total 77 sec January 20 East St Louis using little 3gram Coot flights 386 384 sec temperature hall 56 means air density up bit normal could argue enhanced flight time lower sink rate degraded lower launch height glider almost hit rafters anyhow guess has low temperature enhanced performance Toms record just little shy Dan Belieffs Open record stood years same meet Coots co-designer Stan Stoy broke own previous Cat Open record two-flight score 844 sec healthy 24 sec over previous mark Drawings Coot appeared December OUR NEW SKY JAMMER selling faster can kit themso better order soon assured r U N SPECIFICATIONS SPAN50 LENGTH5-3 4 WEIGHT3-1 2 4 lbs ENGINE40 RADIO4 Channel DESIGNED FORSPORT FLYING Retail Price see DEALER order direct est . P0 Box 226 Bislies Az 85603 160214322328 1975 April 1978 issues Mode/Aviation NFFS Affairs might have noticed recent FF suppliers listing Marty Thompson wife Karen now handling NFFS Supplies having relieved Jose Maria Pinto job another switch Membership Department Kit Sonesen 8616 Maple Grove Ct. Sacramento CA 95828 has taken over membership management tasks Bill Booth has job past few years Join up Membership fees Age 19 andoverorresidents foreign countries $l0for year $18 two Age 18 under $525 year $950 two membership includes subscription Free Flight NFFS Digest subscriptions available membership recent issue Digest writing late Feb SeptemberNovember 1979 issue coveringthe World Champs think member did receive issue best check Kit Help know source good oldfashioned Banana Liquid Banana Oil would please let know about Id appreciate Editors note also known amyl acetate AMA Supply Services has recently offered its Airjacket patches Indoor World Champs coming West Baden offer following bumper sticker/jacket patch suggestion Indoor model ers bathtub bent coat-hangers Nats Unofficial Events Terry Rimert NFFS Official Unofficial-Events Director says will simply send him stamped self-addressed envelope hell send complete list rules Nats unofficial events have hunch hell toss three-views Pietenpol Air Camper suggests have floats planes bring along Nats perhaps theyll able find manu facture puddle Perryman will run hydro events much damp rag can found launch Added list unofficial events Oldtimer Rubber Scale Battle Britain rubber scale eventa mass-launch last-onedown-gets-the-marbles sort thing sponsored Cleveland Free Flight Society will probably Embryo Endurance event Buzzing BuLlards will host Flying Aces Club Scale Nats Aug 9 10 Im beginning think attend Nats Id have skip official stuff just fly fun Anyhow can learn about writing Terry Rimert 367 Orange Ave Baldwin FL 32334 Bob Meuser 4200 GregorTt Street Oakland CA 94619 FF Indoor/Tenny Con finued page 50 fastened securely inside box cannot move around other items inside box props accessories etc must also fastened down cannot puncture model cover ing details packing will vary model type models box Pay attention guys will quiz pass models reach VNART safely boxs size shape can determined number factors some totally unrelated models themselves example boxes carried frequently airliners can designed fit under scat overhead luggage carrier tactic requires advance knowledge dimensions available storage space Owners small car such VW may carefully plan biggest box can maneuvered through door rear seat safely extreme example European indoor flier removed both rear seat passenger seat car installed foam rubber padding across open spaces made long box carry several models open space behind drivers seat luggage space arrangement gave ample shock protection models spite occasional stretches very bumpy ruads price pald lonely trip models undamaged arrived World Championships Boxes take intercontinental trips must strong light Strong prevent being crushed light allow owner carry long distances sometimes found between various sections large intercontinental airports pointed out April column plexiglas panels should installed allow Customs inspectors see contents opening box less rigorous trips cardboard both very serviceable can quite adequate proper construc tion techniques first requirements shipping 114 Model Aviation AUDIO FLIGHT TIMER Prevents dead-stick landinas Generates incremental audio timing signals Ideal timing pattern flightsooass etc case less battery $2495$150shipping Less case mounts transmitter $2195 shipping Write free brochure Industrial Inventions Inc RD 2 463A US Roule 1 Monmouth Jct New Jersey 08852
Edition: Model Aviation - 1980/06
Page Numbers: 44, 45, 46, 113, 114
Tj9jjjjIIJJlj/ FYf7 OFTHE FUTURE THIS article presents design concept vast array free flight duration applications could revolutionize configurations used concept giving overview competition free-flight events both concept its potential benefits hope indoors out basic idea behind varied solutions individual problems concept isnt new rather has developed will found thereby producing quickest two modifications make both evolution designs reliable improved alternative previous designs category modeling too Design Concept outdoor freelong search has perfect airfoil flight events powered either internal right combination moments article combustion engines twisted rubber motors suggests complete change underlying indoor outdoor hand-launch glider approach used design free-flight models optimum climb glide configurations events completely different power available Contained within article concepts todays engines rubber arms best main points details its first successful climb configuration holds model application free-flight design competition back least allowing climb nearly vertical hope success project ly other words design low drag highlighted will prompt others investigate climbs very near its zero lift trim point glide however ideal configuration will achieve low sink rate requiring low wing loadings operation high angles-of-attack should additionally noted highly cambered airfoils perform well high angles-ofattack very poorly during climb due high drag low angles-of-attack Therefore propose designing free flight planes much less compromise performance between phase flight use variable geometry Specifically approach propose fold wings airplane along chordwise hinge lines starting tip panel successive panel folds under see Fig 1 permits bottom surfaces adjoining panels mate resulting low-drag launch configuration Note innermost panel wing doesnt fold thus 44 Model Aviation leaving rigid stub provide necessary lift stability during launch Like previous folding wing concepts wing spring loaded hinges extended shape assumed restrained Unlike previous attempts fold ing wing models suggest use ofthe following two ideas 1 Fold wing once fold after first enclosing already folded panels cavity created wings undercamber implies use least modestly undercambered airfoils 2 Trigger openning wings based drop velocity model resulting reduction power due engine shut down rubber unwind impulsive nature handlaunch gliders launch triggering device should separate wing reduce load must withstand way fabricate such device attach small vane end arm pivoted other end arm preloaded pivot end hold vane forward glide position minimizing drag generating trim force desired preparing launch plane arm rotated 180 degrees lock retainers attached wing active control surface trapping next arms pivot See Fig 2 During launch vane generates lift force opposes mechanical preload thus keeping arm launch Illustrated Jim Newman Fig 1 musicgoesdownandaround. Arrows 1 2 3 steps type make obvious guess some hungry FAI fliersprobably among European guys seek clever technical edges may first exploit jump performance Picture javelin launching June 1980 45 2 Middle panel tip folds under 3 q ger locks panels 42 ausnor noiaing secono series tripie folding wing Indoor hand-launched gliders Left U-Trigger launch position Note opening covered mylar extending over holes fairing block Right 0-Trigger glide position Corresponding sketches Newman based Stans drawings help make clear photos taken Mike Stoy Top view hinge right wing tiphinge masking tape Rubber band causes wing openwire holds wing folded position being locked under 0-Trigger Condenser paper covers wedge removed clear finger rest Dont forget glider illustrates principle left isdiagramatic explanation similar photo 0-Trigger glide position Vr equal lessthan V Stall vane Right 0-Triggerin launch position also matches photo case Vr greater V Stall vane position long moments about pivot due lift force exceeds opposing mechan ical moment assure clean trip suggest design vane such stalls before lift-generated moment falls below magnitude mechanical moment After vane stalls arm swings forward releasing wings auto surfaces mechanism will referred q-trigger now article since q symbol dynamic pressure aerodynamics approach presented offers number advantages over fixed-geometry designs some accompany folding wing scheme others unique concept major advantages 1 The airfoil optimized both flight modes symmetrical semi-symmetrical during climb undercambered during glide 2 The frontal area wetted surface area reduced multiple fold system during climb resulting reduction drag 3 Structural weight can reduced due two factors load applied center section lower since reduced lift during launch lowers shear stress since distributed over shorter span also lowers bending induced stresses b folded sections need strong enough accommodate bending loads applied spring loading hinges glide lift forces since no aerodynamic loads applied during launch 4 The q-trigger being sensitive velocity changes allows wings opening and/or auto surfaces actuation based actual flight path launch predicted pattern fixed time Success Date point may wondering does really work often Let offer substantial evidence potential impact approach free-flight competition have built three triple-foldingwing indoor hand-launch gliders date shown photo three have worked almost flawlessly having credit over 200 flights date second competition design entered bettered national record stood eight years However doesnt tell whole story record Category II IHLG class allows use buildings up 100 feet high new record set building measuring 75 feet high high time 756 seconds obvious potential better performance under higher ceilings since glider hit roof ofthe 75-foot building number times Some preliminary conclusions can drawn currently documented performance design readers familiar state-of-the-art IHLG times 64-65 seconds exceptional site record set Therefore design has demonstrated 15% performance improvement Future opinion similar increases performance could realized other free-flight categories concept no substitute picking air outdoor events should provide advantage especially under dead-air conditions article dont mean imply designing folding wing models will easy since have demonstrated potential performance increase consistent operation least uncertainty surrounding project area should gone Let point out some problems feel need work 1 lightweight durable hinging method wing panels needs developed Presently plywood masking tape have proved Continued page 113 46 Model Aviation V Trigger pivots after vane stalls Retainers released Trapped RetaIners / / Spring / three modes possible powered free flight bottom throughflight path Launch mode wings folded during transition wings unfold glide mode Far out Heck did go moon didnt / / / J14 Different Approach/Stoy Continued page 46 successful models 2 A streamline method applying opening torque hinges must found Currently use rubber bands 3 A streamlined q-trigger can probably designed As new idea its eventual impact difficult predict approach become popular essential people begin win designs since competitive free flighters simply follow trends winning models feeling dont have time experiment readers have ability design successful models become convinced approach worthy efforts feel free flight can become exciting changing category over next few years want become involved building folding wing planes would interested discussing ideas problems Editors Note As competitionfreeflighters aware Stan Stoy has used principles achieve hand-launched glider times demonstrate great performance increase much first few people able believe possible power concept offers quantum jump performance although devel opment mechanics poses challengeper haps met Jim Newman did illustrations remarks forces FFship enormous witness flutter loss components year Ifeel wishful thinking expect very low forces involved Q FF Endurance/Meuser Continued page 49 after taping wing piece scrap plywood would imagine beginner might have bit problem sanding four sections separately getting airfoils match joints tendency would over-sand ends panels adjacent joints use large sanding block/2 x 3 x lOin minimumwould help heres thought works ol bumble thumbs should work anybody Tape four sections together joints using chordwise strips masking tape lower surface sanding wing piece sanding completed tape still attached apply glue choice opposing surfaces prop panels up proper angles smear glue oozes top joint nice fillet using finger let chemistry proceed tape bottom will keep excess glue running over town glue-skin reinforcement can added later elect sand wing panels separ ately masking-tape trick neat way make mitered joints recently read magazine about fine furniture Ive doing miterjoints way both fine furniture glider wings some 40 years didnt know other way price Super Chuck $4 plus $150 handling shipping per box box could contain several Super Chucks other Blue Ridge kits supplies intend ordering single Super Chuck might pay check Blue Ridge first address PO Box 429 Skyland NC 28776 library Im sure Bill Warner will present complete run-down Bill Hannans recently published book Peanut Power scale modelers point view Ill just say few things about general free flighters point view emphasis course Peanut Scale secondary emphasis other forms freeflight scale modeling sections construc tion covering props materials ground-support equipment flying forth handy trouble-shooting chart applicable small free-flight rubber-power model begin ning free fighter would find much value think beginner would better off starting something bit larger Peanut Scale such P-30 provided has access large enough flying field after seeing book might decide Peanut Scale branch freeflight hed like pursue price tag $795 makes comparable price four general interest ie 85% RC magazines hobby shop doesnt have yet can order directly publisher Historical Aviation Album PO Box 33 Temple City CA 91780 Include buck per order June 1980 113 mostly Bob Granville other members oftrigger securely latch panels anville family collectionwould favor folding concept conjunction good Seelig timer couple offorce multiplying levers latch wings indicative kind thinking may necessary turn brilliant concept practical reality Once happens things will never same Stan shows us vision confident cleverfreeflighters can turn physical reality After nota paper idea Stans work has brought us halfway down road begin some half-A sheet balsa things pot ofgold end rainbow 4 Bits Still winning B IG $4495 COMING SOON THE PROPHET2 meter sailplanedesugned Joe Ruth ADVANCER wth adi Dihedral fr am beginner expert single model airplane. Almost Ready Fly JAMMER cover Way $89 Ready Fly B 40 PRO LINE RADIO price S l CAP YOUR CLUB LOGO Great RC CIubsI Let Know Members Arel Low Minimum Reasonable Prices Good Servicel lnqu BCall Write pnted 500~TOP DOG SHIRTS4730 SW 75th Ave 7ixd~N\Miami FL 33155 ti1 S 13051 261 -7768 postage 6% tax California residents truly delightful book sort just plain fun own thumb through occasionally aside its information content Coot strikes again So whats new Im getting sick hearing about Coot its various wins records other great gliders Stoy boys have invented can hardly stand Coot Folder Wasp probably few Ive never heard Well turns out young Tom Croft upped Senior Category Indoor Hand Launch Glider record two-flight total 77 sec January 20 East St Louis using little 3gram Coot flights 386 384 sec temperature hall 56 means air density up bit normal could argue enhanced flight time lower sink rate degraded lower launch height glider almost hit rafters anyhow guess has low temperature enhanced performance Toms record just little shy Dan Belieffs Open record stood years same meet Coots co-designer Stan Stoy broke own previous Cat Open record two-flight score 844 sec healthy 24 sec over previous mark Drawings Coot appeared December OUR NEW SKY JAMMER selling faster can kit themso better order soon assured r U N SPECIFICATIONS SPAN50 LENGTH5-3 4 WEIGHT3-1 2 4 lbs ENGINE40 RADIO4 Channel DESIGNED FORSPORT FLYING Retail Price see DEALER order direct est . P0 Box 226 Bislies Az 85603 160214322328 1975 April 1978 issues Mode/Aviation NFFS Affairs might have noticed recent FF suppliers listing Marty Thompson wife Karen now handling NFFS Supplies having relieved Jose Maria Pinto job another switch Membership Department Kit Sonesen 8616 Maple Grove Ct. Sacramento CA 95828 has taken over membership management tasks Bill Booth has job past few years Join up Membership fees Age 19 andoverorresidents foreign countries $l0for year $18 two Age 18 under $525 year $950 two membership includes subscription Free Flight NFFS Digest subscriptions available membership recent issue Digest writing late Feb SeptemberNovember 1979 issue coveringthe World Champs think member did receive issue best check Kit Help know source good oldfashioned Banana Liquid Banana Oil would please let know about Id appreciate Editors note also known amyl acetate AMA Supply Services has recently offered its Airjacket patches Indoor World Champs coming West Baden offer following bumper sticker/jacket patch suggestion Indoor model ers bathtub bent coat-hangers Nats Unofficial Events Terry Rimert NFFS Official Unofficial-Events Director says will simply send him stamped self-addressed envelope hell send complete list rules Nats unofficial events have hunch hell toss three-views Pietenpol Air Camper suggests have floats planes bring along Nats perhaps theyll able find manu facture puddle Perryman will run hydro events much damp rag can found launch Added list unofficial events Oldtimer Rubber Scale Battle Britain rubber scale eventa mass-launch last-onedown-gets-the-marbles sort thing sponsored Cleveland Free Flight Society will probably Embryo Endurance event Buzzing BuLlards will host Flying Aces Club Scale Nats Aug 9 10 Im beginning think attend Nats Id have skip official stuff just fly fun Anyhow can learn about writing Terry Rimert 367 Orange Ave Baldwin FL 32334 Bob Meuser 4200 GregorTt Street Oakland CA 94619 FF Indoor/Tenny Con finued page 50 fastened securely inside box cannot move around other items inside box props accessories etc must also fastened down cannot puncture model cover ing details packing will vary model type models box Pay attention guys will quiz pass models reach VNART safely boxs size shape can determined number factors some totally unrelated models themselves example boxes carried frequently airliners can designed fit under scat overhead luggage carrier tactic requires advance knowledge dimensions available storage space Owners small car such VW may carefully plan biggest box can maneuvered through door rear seat safely extreme example European indoor flier removed both rear seat passenger seat car installed foam rubber padding across open spaces made long box carry several models open space behind drivers seat luggage space arrangement gave ample shock protection models spite occasional stretches very bumpy ruads price pald lonely trip models undamaged arrived World Championships Boxes take intercontinental trips must strong light Strong prevent being crushed light allow owner carry long distances sometimes found between various sections large intercontinental airports pointed out April column plexiglas panels should installed allow Customs inspectors see contents opening box less rigorous trips cardboard both very serviceable can quite adequate proper construc tion techniques first requirements shipping 114 Model Aviation AUDIO FLIGHT TIMER Prevents dead-stick landinas Generates incremental audio timing signals Ideal timing pattern flightsooass etc case less battery $2495$150shipping Less case mounts transmitter $2195 shipping Write free brochure Industrial Inventions Inc RD 2 463A US Roule 1 Monmouth Jct New Jersey 08852