Free Flight COPTER CAPERS Awhile back Outdoor Rubber-Power Helicop ter added Nats program unofficial NFFS-sponsored event got scratching head about problem Outdoor helicopters some 40 years have employed twin fixed-pitch rotors re volving opposite directions rubber unwinds fall out sky record set ultra-light weight indoor type copter Somehow Ci V &9 26 Duration didnt seem like right way job Outdoor models should glide catch thermals get lost such make copter glide orotate gas-powered copter lads figured out decades ago vanes rather being fixed pivoted such way let seek proper angle attack depending motor torque includes zem torqueautorotation vanes have horizontal tails nose K III 236 WORLD RECORD IZUBSER-POWER HWCOPTER BY IULIO PeLCI ITALY DATA FOt4 MODELLISTSCA PREE PLdIT tJEwse4S Iz1 Bob Meuser weights pivoted CGs effect vane complete glider towed around circle hub constrained hub glide around circle chopper have two four-blade rotors motor tensioner free-wheel device course dethermalizer fuse-actuated device prevent rel ative rotation rotors hardware built necessity having build eight stick-and-tissue vanes relegated project back burner About received copy Italian magazine Modellistica showing Giulio Pelegis model set world records distance 17200 ft altitude 1962 ft Italian national record duration 28 mm 45 sec Pelegis model has two-vane rotor glider type vanes torque reaction rather being applied second set lifting vanes applied set three vanes arranged simply supply torque lift thrust first blush doesnt seem like very efficient arrangement goes like Both rotors receive same torque amount energy rotor receives proportion its speed ro tation lifting rotor turns three times fast torque vanes threefourths energy rubber motor goes producing lift onefourth supplied torque vanes goes useless churning air Clear ly greatest efficiency torque vanes should large possible until weight becomes problem torque vanes replaced lifting vanes efficiency would greater would also additional weight hub counterweights etc So appears Pelegis arrangement proper solution Details Pelegis rotor-hub hardware presented worked out own opted somewhat smaller model two-vane torque motor simplicity although three vanes possibly make mounting simpler two vanes make packing simpler held individually rubber bands torque vanes can slide along rolledtube fuselage vary stability Get too low model will turn tur tle too high model oscillates wildly Getting correct tail angle main rotor vanes simple matter inciden tally put enough nose weight bal ance vanes about pivot point flew vane glider determine right stabilizer incidence angle torque vanes rather light singlesurface affairs built flat 28 Model Aviation turned high-pitch propellers doped So get little free lift out drawing shows Pelegis model photos wont burden drawings until get thoroughly sorted out Unless send stamped self-addressed envelope Unofficial Events San Diego Orbit eers have whipped up another event outdoor flying Requirements maximum dimension direction 30 free-wheeling plastic prop maximum rubher weight 10 grams event will flown initially 90-sec maxes might well extended 2 mm John Oldenkamp designed event along Clarence Mather Natko Antoni olli has built several models meeting specs says capable flights around minute dead air number commercial kits meet specs P/30 Formula Orbiteers call Sig Maxi-Flyer John reck ons ideal total weight such model including rubber would about 29 grams should strain ones genuity Build anything can contrive using nothing materials supplied Delta Dart kit contestant entered helicopter such event meet sponsored San Francisco branch American Institute Aeronautical Engineers National Free Flight Society regu larly conducts postal contests young sters Models simple rules mini mal brief run-down events Outdoor HL Glider size Catapult Glider no restrictions models catapult restricted 8-in loop /8 3/16 rubber contestant must hold model hand stick tied end catapult rubber other Towline-glider 164 ft maximum towline length 279 sq maximum area wing tail no weight restriction ROG Profile Scale no points scale fidelity duration score model must take off Indoor HLG size Baby ROG 30 sq max wing area model must take off AMA HL Stick anything rubber powered less 300 sq wing area includes microfilm classes plus Pennyplane Easy B further details models contests write Ed Whitten PO Box 176 Wall St Station New York NY 10005 Manhattan Cabin class indoor models introduced mid-sixties 4TIP DIHEDRAL KLI J[ provide semi-scale model would take off ground post respectable flight times yet simple build Rules called fuselage large enough enclose box 2 X 3 X 4 inches maximum fuselage length wingspan 20 mini mum weight rubber 02 oz recent attempts revive event maximum dimensions reduced 20 box size 1 /4 X 2 X 3 event seems have lot going it has failed become popular Nothing New story Frank Zaics 1964-65 Model Aeronautic Yearbook J P Glass credits Bob Clary developing continued page 77 BANDBOX P730 JOHN OLDEAIKAMP httl hh 8 PROP WIMG SECTION 0Z465 Aprii 1976 29 Top-end hardware oo Meusers rubber-powered duration helicopter includes blade axles free-wheeler rubber tensionser fuse-operated dethermalizer Right model designed glide fall Out sky Complete details text FF Duration/Meuser continued page 29 first microfilm use model cov ering material thin plastic films would qualify under definition micro film used least early 1891 probably lot earlier other pur poses new enlarged edition 1911 delightful book Soap Bubbles Colours Forces Which Mould author CV Boys quotes letter Mr Glew no pun intended describing microfilm made 20 years earlier shewed no change time Mr Glews formula celluloid dissolved amyl acetate 8 grains ounce whatever boiled few minutes cautioning reader its flammability drive off moisture ensuring clear unclouded films drops solution should fall about 1 /2 inches above surface water drops may roll about air-film delay spreading Black extremely thin films may raised 2 3 inches diameter obtained col ored films over foot diameter Accord ing Mr Glew Lord Rayleigh has made use films enclosing various gases. J P Glass describes Bob Clarys experi mental procedure method consisted continuing add imaginable kind thing quart tWo dope likens result something brewed Shakespeares Macbeth witches Al Capps Kickapoo Joy Juice works Low-Ceiling Hand-Launch Gliders types free-flight modelsindoor outdoor regardless motive powerstillair duration will improved moving center-of-gravity back point longitudinal stability becomes problem Flying turbulent air favors forward CG position thats other story comes bit shock find time-honored maxim does apply apparently low-ceiling indoor HLG flying Awhile back Ron Wittman writing Indoor News Views reported some experimenting done Tara 16 Mind model already trimmed well enough have set Cate gory record held respectable period time before Ron started messing around Ron started adding weight nose adding up trailing edge stabilizer found flight time improved continuously until gettingtimes 34 sec isnt half bad 20-foot ceiling Rons flying companion Bob Gibbs tried same pro cedure own glider achieved same results first read story figured must misinterpreting whole thing upon checking both Ron Bob found Ron meant exactly what Turhulator z liz mono ftiamnz Hk point / 48ZCb 4 said recently Bob Klipp Editor Turbulator reported some pretty good low-ceiling IHLG flight times made Dick Hardcastle subsequent corre spondence Dick turned up some inter esting information Dick flies HLG lot really HLG nut uses away time until serious stuff startsEasy B like Dick built modified version Dan BelieWs Fluff Duf beat record set Ron Wittman Tara 16 Dans plans didnt show CG position Dick set up CG distance 56 60% root chord back leading edge 56 65% CG say trade flop applying CMOS theory microfilm models Dick pon dered applicability theory gliders CMOS constant margin stability theory formalized Hal Crane Hank Coles rather antique still valid presentation Bud Tenny helped make CMOS height fashion theory accounts way wing tail aspect ratio tail area tail moment arm affect longitudinal sta bility Its long story Dick applied CMOS theory Lee Hines Sweepette 16 discovered 63% CG posi tion Lee used corresponded zero mar gin stability MOS Dick calculated CG position Fluf Duf zero MOS48% set up way nounced new-found old theory club Thermaleers St Louis Friday set site record Sunday Time will tell whether zero MOS best value point some gliders seem fly markedly better CG much farther forward War/i down left ung u/i Onr{9fft U 1 c-9rain Wah 3h t M7 RicI-IAPD I4AR0A5TL5 MOD/f/ED FL UF- DUE #IY 64~ 5 ght think Dick supplied following additional information about modified Fluf Duf model launched straight up 48% CG model flew noticeably faster its sink rate lower John Gard sug gested turbulators Dick says has no way knowing whether help glide likes pattern left climb left glide opposite Belieffs setup left wing has camber right Both tips washed out Down flap warped left trailing edge about half way out up flap right Wing sanded /8 sheet camber cracked along high point held way jig Edge-Joining Balsa Sheets Joining two sheets together form wider can pain particularly sheets thin way eliminate often used array pins weights have used join sheets thin 0025 Pennyplane props Im sure would work thinner material 5 Aav TAPE __ T0 / 4 First course edges must trued aid accurate straightedge thicker sheets applying glue di rectly tube ok helps April 1976 77 FF Duration continued slot plastic nozzle slightly wider thickness sheet thin sheets prefer following procedure Run out bead glue along workbench smooth uniformly thin thickness balsa scrap dip edge sheet comes magic inherent elasticity masking drafting tape used supply clamp ing force After applying glue place sheets together edge-to-edge over strip Saran Wrap Tear off piece tape bit wider total width sheets Stretch tape between thumbs press sticky side onto sheet short distance joined edges relax pull tape tape will pull joint tight Finally pull ends tape over outer edges sheet stick workboard Repeat appropriate inter vals along joint joining wide sheets might pre fer use short strips tape weights hold joint flat glue sets thicker sheets apply tape both sides joint Coupe Prop Since prop carving enigma neophite rubber-power modelers almost-ready-to-fly prop Coupe dHiver small Unlimited Rub ber class models will come welcome news pair molded sheet balsa blades shaped outline may obtained $300 two $250 post paid Blue Ridge Models PO Box 9188 Asheville NC 28805 Complete structions included finishing mounting Z-wire hub popular types some modelers ques tion stability molded blades have some have spent 15 winters well ventilated unheated garage show ing measurable change pitch molded blades stronger carved blades because grain runs right way throughout blade Balsa Stripper Ray Harlan manufac tures balsa stripper thats ideal cutting thin odd-size strips used con struction Indoor models Peanut Scale like Similar developed Erv Rodemsky features micrometers adjusting position heavy alumi num straightedge well machined razor blade holder ensure square edges accurate widths cuts tapered strips easily straight ones mean pur pose price $1800 plus postage R Harlan 15 Happy Hollow Rd Wayland Mass 01778 New Wood Supplier dont know anyone world would want 5 ft long piece 1/16 sq balsa spruce wanted hundred other un usual sizes place look would Superior Aircraft Materials PO Box 8082 Long Beach CA 90808 Sizes such 1/20 sheet 1/64 square 1/20 square 1/20 X 1/40 1/40 sheet just few sizes stocked lengths range 18 5 ft addition such unique sizes Superior handles standard sizes both spruce balsa plus bit plywood too prices sizes comparable same bit higher big-time suppliers quality Well obvious some precision Sal Taibi learned tool-anddie maker put Competition Models kits rubbed off son Mike runs Superior Works Write catalog sheets address 4200 Gregory St Oak land CA 94619 78 Model Aviation TRY SCALE ACCESSORIES KITS INE GUN KITS ENGINE KITS & CYLINDERS PILOTS LS PROPS & HANGERS SPINNERS INGS CANOPIES K COWLS ASK FOR OUR PRODUCTS AT YOUR DEALER OR SEND 25 FOR OUR CATALOG WILLIAMS BROS DEPT M 181 PAWNEE ST SAN MARCOSCA 92069 SAVE MONEY TROPHIES OR TROPHY PARTS STOCK CUSTOM engraving figures walnut marble cups hardware etc REQUEST PRICES TOM SUTOR TROPHIES Rt 2 Box X438A Avon Park FIa 33825 813 453-3470 imosx ready-to-ny molded blades tor oupe Ray Harlan manufactures balsa stripper dHiver now available Blue Ridge Mod- Features micrometer adjustments Its deluxe elswith Z-wire hub Details text item described fully article
Edition: Model Aviation - 1976/04
Page Numbers: 28, 29, 77, 78
Free Flight COPTER CAPERS Awhile back Outdoor Rubber-Power Helicop ter added Nats program unofficial NFFS-sponsored event got scratching head about problem Outdoor helicopters some 40 years have employed twin fixed-pitch rotors re volving opposite directions rubber unwinds fall out sky record set ultra-light weight indoor type copter Somehow Ci V &9 26 Duration didnt seem like right way job Outdoor models should glide catch thermals get lost such make copter glide orotate gas-powered copter lads figured out decades ago vanes rather being fixed pivoted such way let seek proper angle attack depending motor torque includes zem torqueautorotation vanes have horizontal tails nose K III 236 WORLD RECORD IZUBSER-POWER HWCOPTER BY IULIO PeLCI ITALY DATA FOt4 MODELLISTSCA PREE PLdIT tJEwse4S Iz1 Bob Meuser weights pivoted CGs effect vane complete glider towed around circle hub constrained hub glide around circle chopper have two four-blade rotors motor tensioner free-wheel device course dethermalizer fuse-actuated device prevent rel ative rotation rotors hardware built necessity having build eight stick-and-tissue vanes relegated project back burner About received copy Italian magazine Modellistica showing Giulio Pelegis model set world records distance 17200 ft altitude 1962 ft Italian national record duration 28 mm 45 sec Pelegis model has two-vane rotor glider type vanes torque reaction rather being applied second set lifting vanes applied set three vanes arranged simply supply torque lift thrust first blush doesnt seem like very efficient arrangement goes like Both rotors receive same torque amount energy rotor receives proportion its speed ro tation lifting rotor turns three times fast torque vanes threefourths energy rubber motor goes producing lift onefourth supplied torque vanes goes useless churning air Clear ly greatest efficiency torque vanes should large possible until weight becomes problem torque vanes replaced lifting vanes efficiency would greater would also additional weight hub counterweights etc So appears Pelegis arrangement proper solution Details Pelegis rotor-hub hardware presented worked out own opted somewhat smaller model two-vane torque motor simplicity although three vanes possibly make mounting simpler two vanes make packing simpler held individually rubber bands torque vanes can slide along rolledtube fuselage vary stability Get too low model will turn tur tle too high model oscillates wildly Getting correct tail angle main rotor vanes simple matter inciden tally put enough nose weight bal ance vanes about pivot point flew vane glider determine right stabilizer incidence angle torque vanes rather light singlesurface affairs built flat 28 Model Aviation turned high-pitch propellers doped So get little free lift out drawing shows Pelegis model photos wont burden drawings until get thoroughly sorted out Unless send stamped self-addressed envelope Unofficial Events San Diego Orbit eers have whipped up another event outdoor flying Requirements maximum dimension direction 30 free-wheeling plastic prop maximum rubher weight 10 grams event will flown initially 90-sec maxes might well extended 2 mm John Oldenkamp designed event along Clarence Mather Natko Antoni olli has built several models meeting specs says capable flights around minute dead air number commercial kits meet specs P/30 Formula Orbiteers call Sig Maxi-Flyer John reck ons ideal total weight such model including rubber would about 29 grams should strain ones genuity Build anything can contrive using nothing materials supplied Delta Dart kit contestant entered helicopter such event meet sponsored San Francisco branch American Institute Aeronautical Engineers National Free Flight Society regu larly conducts postal contests young sters Models simple rules mini mal brief run-down events Outdoor HL Glider size Catapult Glider no restrictions models catapult restricted 8-in loop /8 3/16 rubber contestant must hold model hand stick tied end catapult rubber other Towline-glider 164 ft maximum towline length 279 sq maximum area wing tail no weight restriction ROG Profile Scale no points scale fidelity duration score model must take off Indoor HLG size Baby ROG 30 sq max wing area model must take off AMA HL Stick anything rubber powered less 300 sq wing area includes microfilm classes plus Pennyplane Easy B further details models contests write Ed Whitten PO Box 176 Wall St Station New York NY 10005 Manhattan Cabin class indoor models introduced mid-sixties 4TIP DIHEDRAL KLI J[ provide semi-scale model would take off ground post respectable flight times yet simple build Rules called fuselage large enough enclose box 2 X 3 X 4 inches maximum fuselage length wingspan 20 mini mum weight rubber 02 oz recent attempts revive event maximum dimensions reduced 20 box size 1 /4 X 2 X 3 event seems have lot going it has failed become popular Nothing New story Frank Zaics 1964-65 Model Aeronautic Yearbook J P Glass credits Bob Clary developing continued page 77 BANDBOX P730 JOHN OLDEAIKAMP httl hh 8 PROP WIMG SECTION 0Z465 Aprii 1976 29 Top-end hardware oo Meusers rubber-powered duration helicopter includes blade axles free-wheeler rubber tensionser fuse-operated dethermalizer Right model designed glide fall Out sky Complete details text FF Duration/Meuser continued page 29 first microfilm use model cov ering material thin plastic films would qualify under definition micro film used least early 1891 probably lot earlier other pur poses new enlarged edition 1911 delightful book Soap Bubbles Colours Forces Which Mould author CV Boys quotes letter Mr Glew no pun intended describing microfilm made 20 years earlier shewed no change time Mr Glews formula celluloid dissolved amyl acetate 8 grains ounce whatever boiled few minutes cautioning reader its flammability drive off moisture ensuring clear unclouded films drops solution should fall about 1 /2 inches above surface water drops may roll about air-film delay spreading Black extremely thin films may raised 2 3 inches diameter obtained col ored films over foot diameter Accord ing Mr Glew Lord Rayleigh has made use films enclosing various gases. J P Glass describes Bob Clarys experi mental procedure method consisted continuing add imaginable kind thing quart tWo dope likens result something brewed Shakespeares Macbeth witches Al Capps Kickapoo Joy Juice works Low-Ceiling Hand-Launch Gliders types free-flight modelsindoor outdoor regardless motive powerstillair duration will improved moving center-of-gravity back point longitudinal stability becomes problem Flying turbulent air favors forward CG position thats other story comes bit shock find time-honored maxim does apply apparently low-ceiling indoor HLG flying Awhile back Ron Wittman writing Indoor News Views reported some experimenting done Tara 16 Mind model already trimmed well enough have set Cate gory record held respectable period time before Ron started messing around Ron started adding weight nose adding up trailing edge stabilizer found flight time improved continuously until gettingtimes 34 sec isnt half bad 20-foot ceiling Rons flying companion Bob Gibbs tried same pro cedure own glider achieved same results first read story figured must misinterpreting whole thing upon checking both Ron Bob found Ron meant exactly what Turhulator z liz mono ftiamnz Hk point / 48ZCb 4 said recently Bob Klipp Editor Turbulator reported some pretty good low-ceiling IHLG flight times made Dick Hardcastle subsequent corre spondence Dick turned up some inter esting information Dick flies HLG lot really HLG nut uses away time until serious stuff startsEasy B like Dick built modified version Dan BelieWs Fluff Duf beat record set Ron Wittman Tara 16 Dans plans didnt show CG position Dick set up CG distance 56 60% root chord back leading edge 56 65% CG say trade flop applying CMOS theory microfilm models Dick pon dered applicability theory gliders CMOS constant margin stability theory formalized Hal Crane Hank Coles rather antique still valid presentation Bud Tenny helped make CMOS height fashion theory accounts way wing tail aspect ratio tail area tail moment arm affect longitudinal sta bility Its long story Dick applied CMOS theory Lee Hines Sweepette 16 discovered 63% CG posi tion Lee used corresponded zero mar gin stability MOS Dick calculated CG position Fluf Duf zero MOS48% set up way nounced new-found old theory club Thermaleers St Louis Friday set site record Sunday Time will tell whether zero MOS best value point some gliders seem fly markedly better CG much farther forward War/i down left ung u/i Onr{9fft U 1 c-9rain Wah 3h t M7 RicI-IAPD I4AR0A5TL5 MOD/f/ED FL UF- DUE #IY 64~ 5 ght think Dick supplied following additional information about modified Fluf Duf model launched straight up 48% CG model flew noticeably faster its sink rate lower John Gard sug gested turbulators Dick says has no way knowing whether help glide likes pattern left climb left glide opposite Belieffs setup left wing has camber right Both tips washed out Down flap warped left trailing edge about half way out up flap right Wing sanded /8 sheet camber cracked along high point held way jig Edge-Joining Balsa Sheets Joining two sheets together form wider can pain particularly sheets thin way eliminate often used array pins weights have used join sheets thin 0025 Pennyplane props Im sure would work thinner material 5 Aav TAPE __ T0 / 4 First course edges must trued aid accurate straightedge thicker sheets applying glue di rectly tube ok helps April 1976 77 FF Duration continued slot plastic nozzle slightly wider thickness sheet thin sheets prefer following procedure Run out bead glue along workbench smooth uniformly thin thickness balsa scrap dip edge sheet comes magic inherent elasticity masking drafting tape used supply clamp ing force After applying glue place sheets together edge-to-edge over strip Saran Wrap Tear off piece tape bit wider total width sheets Stretch tape between thumbs press sticky side onto sheet short distance joined edges relax pull tape tape will pull joint tight Finally pull ends tape over outer edges sheet stick workboard Repeat appropriate inter vals along joint joining wide sheets might pre fer use short strips tape weights hold joint flat glue sets thicker sheets apply tape both sides joint Coupe Prop Since prop carving enigma neophite rubber-power modelers almost-ready-to-fly prop Coupe dHiver small Unlimited Rub ber class models will come welcome news pair molded sheet balsa blades shaped outline may obtained $300 two $250 post paid Blue Ridge Models PO Box 9188 Asheville NC 28805 Complete structions included finishing mounting Z-wire hub popular types some modelers ques tion stability molded blades have some have spent 15 winters well ventilated unheated garage show ing measurable change pitch molded blades stronger carved blades because grain runs right way throughout blade Balsa Stripper Ray Harlan manufac tures balsa stripper thats ideal cutting thin odd-size strips used con struction Indoor models Peanut Scale like Similar developed Erv Rodemsky features micrometers adjusting position heavy alumi num straightedge well machined razor blade holder ensure square edges accurate widths cuts tapered strips easily straight ones mean pur pose price $1800 plus postage R Harlan 15 Happy Hollow Rd Wayland Mass 01778 New Wood Supplier dont know anyone world would want 5 ft long piece 1/16 sq balsa spruce wanted hundred other un usual sizes place look would Superior Aircraft Materials PO Box 8082 Long Beach CA 90808 Sizes such 1/20 sheet 1/64 square 1/20 square 1/20 X 1/40 1/40 sheet just few sizes stocked lengths range 18 5 ft addition such unique sizes Superior handles standard sizes both spruce balsa plus bit plywood too prices sizes comparable same bit higher big-time suppliers quality Well obvious some precision Sal Taibi learned tool-anddie maker put Competition Models kits rubbed off son Mike runs Superior Works Write catalog sheets address 4200 Gregory St Oak land CA 94619 78 Model Aviation TRY SCALE ACCESSORIES KITS INE GUN KITS ENGINE KITS & CYLINDERS PILOTS LS PROPS & HANGERS SPINNERS INGS CANOPIES K COWLS ASK FOR OUR PRODUCTS AT YOUR DEALER OR SEND 25 FOR OUR CATALOG WILLIAMS BROS DEPT M 181 PAWNEE ST SAN MARCOSCA 92069 SAVE MONEY TROPHIES OR TROPHY PARTS STOCK CUSTOM engraving figures walnut marble cups hardware etc REQUEST PRICES TOM SUTOR TROPHIES Rt 2 Box X438A Avon Park FIa 33825 813 453-3470 imosx ready-to-ny molded blades tor oupe Ray Harlan manufactures balsa stripper dHiver now available Blue Ridge Mod- Features micrometer adjustments Its deluxe elswith Z-wire hub Details text item described fully article
Edition: Model Aviation - 1976/04
Page Numbers: 28, 29, 77, 78
Free Flight COPTER CAPERS Awhile back Outdoor Rubber-Power Helicop ter added Nats program unofficial NFFS-sponsored event got scratching head about problem Outdoor helicopters some 40 years have employed twin fixed-pitch rotors re volving opposite directions rubber unwinds fall out sky record set ultra-light weight indoor type copter Somehow Ci V &9 26 Duration didnt seem like right way job Outdoor models should glide catch thermals get lost such make copter glide orotate gas-powered copter lads figured out decades ago vanes rather being fixed pivoted such way let seek proper angle attack depending motor torque includes zem torqueautorotation vanes have horizontal tails nose K III 236 WORLD RECORD IZUBSER-POWER HWCOPTER BY IULIO PeLCI ITALY DATA FOt4 MODELLISTSCA PREE PLdIT tJEwse4S Iz1 Bob Meuser weights pivoted CGs effect vane complete glider towed around circle hub constrained hub glide around circle chopper have two four-blade rotors motor tensioner free-wheel device course dethermalizer fuse-actuated device prevent rel ative rotation rotors hardware built necessity having build eight stick-and-tissue vanes relegated project back burner About received copy Italian magazine Modellistica showing Giulio Pelegis model set world records distance 17200 ft altitude 1962 ft Italian national record duration 28 mm 45 sec Pelegis model has two-vane rotor glider type vanes torque reaction rather being applied second set lifting vanes applied set three vanes arranged simply supply torque lift thrust first blush doesnt seem like very efficient arrangement goes like Both rotors receive same torque amount energy rotor receives proportion its speed ro tation lifting rotor turns three times fast torque vanes threefourths energy rubber motor goes producing lift onefourth supplied torque vanes goes useless churning air Clear ly greatest efficiency torque vanes should large possible until weight becomes problem torque vanes replaced lifting vanes efficiency would greater would also additional weight hub counterweights etc So appears Pelegis arrangement proper solution Details Pelegis rotor-hub hardware presented worked out own opted somewhat smaller model two-vane torque motor simplicity although three vanes possibly make mounting simpler two vanes make packing simpler held individually rubber bands torque vanes can slide along rolledtube fuselage vary stability Get too low model will turn tur tle too high model oscillates wildly Getting correct tail angle main rotor vanes simple matter inciden tally put enough nose weight bal ance vanes about pivot point flew vane glider determine right stabilizer incidence angle torque vanes rather light singlesurface affairs built flat 28 Model Aviation turned high-pitch propellers doped So get little free lift out drawing shows Pelegis model photos wont burden drawings until get thoroughly sorted out Unless send stamped self-addressed envelope Unofficial Events San Diego Orbit eers have whipped up another event outdoor flying Requirements maximum dimension direction 30 free-wheeling plastic prop maximum rubher weight 10 grams event will flown initially 90-sec maxes might well extended 2 mm John Oldenkamp designed event along Clarence Mather Natko Antoni olli has built several models meeting specs says capable flights around minute dead air number commercial kits meet specs P/30 Formula Orbiteers call Sig Maxi-Flyer John reck ons ideal total weight such model including rubber would about 29 grams should strain ones genuity Build anything can contrive using nothing materials supplied Delta Dart kit contestant entered helicopter such event meet sponsored San Francisco branch American Institute Aeronautical Engineers National Free Flight Society regu larly conducts postal contests young sters Models simple rules mini mal brief run-down events Outdoor HL Glider size Catapult Glider no restrictions models catapult restricted 8-in loop /8 3/16 rubber contestant must hold model hand stick tied end catapult rubber other Towline-glider 164 ft maximum towline length 279 sq maximum area wing tail no weight restriction ROG Profile Scale no points scale fidelity duration score model must take off Indoor HLG size Baby ROG 30 sq max wing area model must take off AMA HL Stick anything rubber powered less 300 sq wing area includes microfilm classes plus Pennyplane Easy B further details models contests write Ed Whitten PO Box 176 Wall St Station New York NY 10005 Manhattan Cabin class indoor models introduced mid-sixties 4TIP DIHEDRAL KLI J[ provide semi-scale model would take off ground post respectable flight times yet simple build Rules called fuselage large enough enclose box 2 X 3 X 4 inches maximum fuselage length wingspan 20 mini mum weight rubber 02 oz recent attempts revive event maximum dimensions reduced 20 box size 1 /4 X 2 X 3 event seems have lot going it has failed become popular Nothing New story Frank Zaics 1964-65 Model Aeronautic Yearbook J P Glass credits Bob Clary developing continued page 77 BANDBOX P730 JOHN OLDEAIKAMP httl hh 8 PROP WIMG SECTION 0Z465 Aprii 1976 29 Top-end hardware oo Meusers rubber-powered duration helicopter includes blade axles free-wheeler rubber tensionser fuse-operated dethermalizer Right model designed glide fall Out sky Complete details text FF Duration/Meuser continued page 29 first microfilm use model cov ering material thin plastic films would qualify under definition micro film used least early 1891 probably lot earlier other pur poses new enlarged edition 1911 delightful book Soap Bubbles Colours Forces Which Mould author CV Boys quotes letter Mr Glew no pun intended describing microfilm made 20 years earlier shewed no change time Mr Glews formula celluloid dissolved amyl acetate 8 grains ounce whatever boiled few minutes cautioning reader its flammability drive off moisture ensuring clear unclouded films drops solution should fall about 1 /2 inches above surface water drops may roll about air-film delay spreading Black extremely thin films may raised 2 3 inches diameter obtained col ored films over foot diameter Accord ing Mr Glew Lord Rayleigh has made use films enclosing various gases. J P Glass describes Bob Clarys experi mental procedure method consisted continuing add imaginable kind thing quart tWo dope likens result something brewed Shakespeares Macbeth witches Al Capps Kickapoo Joy Juice works Low-Ceiling Hand-Launch Gliders types free-flight modelsindoor outdoor regardless motive powerstillair duration will improved moving center-of-gravity back point longitudinal stability becomes problem Flying turbulent air favors forward CG position thats other story comes bit shock find time-honored maxim does apply apparently low-ceiling indoor HLG flying Awhile back Ron Wittman writing Indoor News Views reported some experimenting done Tara 16 Mind model already trimmed well enough have set Cate gory record held respectable period time before Ron started messing around Ron started adding weight nose adding up trailing edge stabilizer found flight time improved continuously until gettingtimes 34 sec isnt half bad 20-foot ceiling Rons flying companion Bob Gibbs tried same pro cedure own glider achieved same results first read story figured must misinterpreting whole thing upon checking both Ron Bob found Ron meant exactly what Turhulator z liz mono ftiamnz Hk point / 48ZCb 4 said recently Bob Klipp Editor Turbulator reported some pretty good low-ceiling IHLG flight times made Dick Hardcastle subsequent corre spondence Dick turned up some inter esting information Dick flies HLG lot really HLG nut uses away time until serious stuff startsEasy B like Dick built modified version Dan BelieWs Fluff Duf beat record set Ron Wittman Tara 16 Dans plans didnt show CG position Dick set up CG distance 56 60% root chord back leading edge 56 65% CG say trade flop applying CMOS theory microfilm models Dick pon dered applicability theory gliders CMOS constant margin stability theory formalized Hal Crane Hank Coles rather antique still valid presentation Bud Tenny helped make CMOS height fashion theory accounts way wing tail aspect ratio tail area tail moment arm affect longitudinal sta bility Its long story Dick applied CMOS theory Lee Hines Sweepette 16 discovered 63% CG posi tion Lee used corresponded zero mar gin stability MOS Dick calculated CG position Fluf Duf zero MOS48% set up way nounced new-found old theory club Thermaleers St Louis Friday set site record Sunday Time will tell whether zero MOS best value point some gliders seem fly markedly better CG much farther forward War/i down left ung u/i Onr{9fft U 1 c-9rain Wah 3h t M7 RicI-IAPD I4AR0A5TL5 MOD/f/ED FL UF- DUE #IY 64~ 5 ght think Dick supplied following additional information about modified Fluf Duf model launched straight up 48% CG model flew noticeably faster its sink rate lower John Gard sug gested turbulators Dick says has no way knowing whether help glide likes pattern left climb left glide opposite Belieffs setup left wing has camber right Both tips washed out Down flap warped left trailing edge about half way out up flap right Wing sanded /8 sheet camber cracked along high point held way jig Edge-Joining Balsa Sheets Joining two sheets together form wider can pain particularly sheets thin way eliminate often used array pins weights have used join sheets thin 0025 Pennyplane props Im sure would work thinner material 5 Aav TAPE __ T0 / 4 First course edges must trued aid accurate straightedge thicker sheets applying glue di rectly tube ok helps April 1976 77 FF Duration continued slot plastic nozzle slightly wider thickness sheet thin sheets prefer following procedure Run out bead glue along workbench smooth uniformly thin thickness balsa scrap dip edge sheet comes magic inherent elasticity masking drafting tape used supply clamp ing force After applying glue place sheets together edge-to-edge over strip Saran Wrap Tear off piece tape bit wider total width sheets Stretch tape between thumbs press sticky side onto sheet short distance joined edges relax pull tape tape will pull joint tight Finally pull ends tape over outer edges sheet stick workboard Repeat appropriate inter vals along joint joining wide sheets might pre fer use short strips tape weights hold joint flat glue sets thicker sheets apply tape both sides joint Coupe Prop Since prop carving enigma neophite rubber-power modelers almost-ready-to-fly prop Coupe dHiver small Unlimited Rub ber class models will come welcome news pair molded sheet balsa blades shaped outline may obtained $300 two $250 post paid Blue Ridge Models PO Box 9188 Asheville NC 28805 Complete structions included finishing mounting Z-wire hub popular types some modelers ques tion stability molded blades have some have spent 15 winters well ventilated unheated garage show ing measurable change pitch molded blades stronger carved blades because grain runs right way throughout blade Balsa Stripper Ray Harlan manufac tures balsa stripper thats ideal cutting thin odd-size strips used con struction Indoor models Peanut Scale like Similar developed Erv Rodemsky features micrometers adjusting position heavy alumi num straightedge well machined razor blade holder ensure square edges accurate widths cuts tapered strips easily straight ones mean pur pose price $1800 plus postage R Harlan 15 Happy Hollow Rd Wayland Mass 01778 New Wood Supplier dont know anyone world would want 5 ft long piece 1/16 sq balsa spruce wanted hundred other un usual sizes place look would Superior Aircraft Materials PO Box 8082 Long Beach CA 90808 Sizes such 1/20 sheet 1/64 square 1/20 square 1/20 X 1/40 1/40 sheet just few sizes stocked lengths range 18 5 ft addition such unique sizes Superior handles standard sizes both spruce balsa plus bit plywood too prices sizes comparable same bit higher big-time suppliers quality Well obvious some precision Sal Taibi learned tool-anddie maker put Competition Models kits rubbed off son Mike runs Superior Works Write catalog sheets address 4200 Gregory St Oak land CA 94619 78 Model Aviation TRY SCALE ACCESSORIES KITS INE GUN KITS ENGINE KITS & CYLINDERS PILOTS LS PROPS & HANGERS SPINNERS INGS CANOPIES K COWLS ASK FOR OUR PRODUCTS AT YOUR DEALER OR SEND 25 FOR OUR CATALOG WILLIAMS BROS DEPT M 181 PAWNEE ST SAN MARCOSCA 92069 SAVE MONEY TROPHIES OR TROPHY PARTS STOCK CUSTOM engraving figures walnut marble cups hardware etc REQUEST PRICES TOM SUTOR TROPHIES Rt 2 Box X438A Avon Park FIa 33825 813 453-3470 imosx ready-to-ny molded blades tor oupe Ray Harlan manufactures balsa stripper dHiver now available Blue Ridge Mod- Features micrometer adjustments Its deluxe elswith Z-wire hub Details text item described fully article
Edition: Model Aviation - 1976/04
Page Numbers: 28, 29, 77, 78
Free Flight COPTER CAPERS Awhile back Outdoor Rubber-Power Helicop ter added Nats program unofficial NFFS-sponsored event got scratching head about problem Outdoor helicopters some 40 years have employed twin fixed-pitch rotors re volving opposite directions rubber unwinds fall out sky record set ultra-light weight indoor type copter Somehow Ci V &9 26 Duration didnt seem like right way job Outdoor models should glide catch thermals get lost such make copter glide orotate gas-powered copter lads figured out decades ago vanes rather being fixed pivoted such way let seek proper angle attack depending motor torque includes zem torqueautorotation vanes have horizontal tails nose K III 236 WORLD RECORD IZUBSER-POWER HWCOPTER BY IULIO PeLCI ITALY DATA FOt4 MODELLISTSCA PREE PLdIT tJEwse4S Iz1 Bob Meuser weights pivoted CGs effect vane complete glider towed around circle hub constrained hub glide around circle chopper have two four-blade rotors motor tensioner free-wheel device course dethermalizer fuse-actuated device prevent rel ative rotation rotors hardware built necessity having build eight stick-and-tissue vanes relegated project back burner About received copy Italian magazine Modellistica showing Giulio Pelegis model set world records distance 17200 ft altitude 1962 ft Italian national record duration 28 mm 45 sec Pelegis model has two-vane rotor glider type vanes torque reaction rather being applied second set lifting vanes applied set three vanes arranged simply supply torque lift thrust first blush doesnt seem like very efficient arrangement goes like Both rotors receive same torque amount energy rotor receives proportion its speed ro tation lifting rotor turns three times fast torque vanes threefourths energy rubber motor goes producing lift onefourth supplied torque vanes goes useless churning air Clear ly greatest efficiency torque vanes should large possible until weight becomes problem torque vanes replaced lifting vanes efficiency would greater would also additional weight hub counterweights etc So appears Pelegis arrangement proper solution Details Pelegis rotor-hub hardware presented worked out own opted somewhat smaller model two-vane torque motor simplicity although three vanes possibly make mounting simpler two vanes make packing simpler held individually rubber bands torque vanes can slide along rolledtube fuselage vary stability Get too low model will turn tur tle too high model oscillates wildly Getting correct tail angle main rotor vanes simple matter inciden tally put enough nose weight bal ance vanes about pivot point flew vane glider determine right stabilizer incidence angle torque vanes rather light singlesurface affairs built flat 28 Model Aviation turned high-pitch propellers doped So get little free lift out drawing shows Pelegis model photos wont burden drawings until get thoroughly sorted out Unless send stamped self-addressed envelope Unofficial Events San Diego Orbit eers have whipped up another event outdoor flying Requirements maximum dimension direction 30 free-wheeling plastic prop maximum rubher weight 10 grams event will flown initially 90-sec maxes might well extended 2 mm John Oldenkamp designed event along Clarence Mather Natko Antoni olli has built several models meeting specs says capable flights around minute dead air number commercial kits meet specs P/30 Formula Orbiteers call Sig Maxi-Flyer John reck ons ideal total weight such model including rubber would about 29 grams should strain ones genuity Build anything can contrive using nothing materials supplied Delta Dart kit contestant entered helicopter such event meet sponsored San Francisco branch American Institute Aeronautical Engineers National Free Flight Society regu larly conducts postal contests young sters Models simple rules mini mal brief run-down events Outdoor HL Glider size Catapult Glider no restrictions models catapult restricted 8-in loop /8 3/16 rubber contestant must hold model hand stick tied end catapult rubber other Towline-glider 164 ft maximum towline length 279 sq maximum area wing tail no weight restriction ROG Profile Scale no points scale fidelity duration score model must take off Indoor HLG size Baby ROG 30 sq max wing area model must take off AMA HL Stick anything rubber powered less 300 sq wing area includes microfilm classes plus Pennyplane Easy B further details models contests write Ed Whitten PO Box 176 Wall St Station New York NY 10005 Manhattan Cabin class indoor models introduced mid-sixties 4TIP DIHEDRAL KLI J[ provide semi-scale model would take off ground post respectable flight times yet simple build Rules called fuselage large enough enclose box 2 X 3 X 4 inches maximum fuselage length wingspan 20 mini mum weight rubber 02 oz recent attempts revive event maximum dimensions reduced 20 box size 1 /4 X 2 X 3 event seems have lot going it has failed become popular Nothing New story Frank Zaics 1964-65 Model Aeronautic Yearbook J P Glass credits Bob Clary developing continued page 77 BANDBOX P730 JOHN OLDEAIKAMP httl hh 8 PROP WIMG SECTION 0Z465 Aprii 1976 29 Top-end hardware oo Meusers rubber-powered duration helicopter includes blade axles free-wheeler rubber tensionser fuse-operated dethermalizer Right model designed glide fall Out sky Complete details text FF Duration/Meuser continued page 29 first microfilm use model cov ering material thin plastic films would qualify under definition micro film used least early 1891 probably lot earlier other pur poses new enlarged edition 1911 delightful book Soap Bubbles Colours Forces Which Mould author CV Boys quotes letter Mr Glew no pun intended describing microfilm made 20 years earlier shewed no change time Mr Glews formula celluloid dissolved amyl acetate 8 grains ounce whatever boiled few minutes cautioning reader its flammability drive off moisture ensuring clear unclouded films drops solution should fall about 1 /2 inches above surface water drops may roll about air-film delay spreading Black extremely thin films may raised 2 3 inches diameter obtained col ored films over foot diameter Accord ing Mr Glew Lord Rayleigh has made use films enclosing various gases. J P Glass describes Bob Clarys experi mental procedure method consisted continuing add imaginable kind thing quart tWo dope likens result something brewed Shakespeares Macbeth witches Al Capps Kickapoo Joy Juice works Low-Ceiling Hand-Launch Gliders types free-flight modelsindoor outdoor regardless motive powerstillair duration will improved moving center-of-gravity back point longitudinal stability becomes problem Flying turbulent air favors forward CG position thats other story comes bit shock find time-honored maxim does apply apparently low-ceiling indoor HLG flying Awhile back Ron Wittman writing Indoor News Views reported some experimenting done Tara 16 Mind model already trimmed well enough have set Cate gory record held respectable period time before Ron started messing around Ron started adding weight nose adding up trailing edge stabilizer found flight time improved continuously until gettingtimes 34 sec isnt half bad 20-foot ceiling Rons flying companion Bob Gibbs tried same pro cedure own glider achieved same results first read story figured must misinterpreting whole thing upon checking both Ron Bob found Ron meant exactly what Turhulator z liz mono ftiamnz Hk point / 48ZCb 4 said recently Bob Klipp Editor Turbulator reported some pretty good low-ceiling IHLG flight times made Dick Hardcastle subsequent corre spondence Dick turned up some inter esting information Dick flies HLG lot really HLG nut uses away time until serious stuff startsEasy B like Dick built modified version Dan BelieWs Fluff Duf beat record set Ron Wittman Tara 16 Dans plans didnt show CG position Dick set up CG distance 56 60% root chord back leading edge 56 65% CG say trade flop applying CMOS theory microfilm models Dick pon dered applicability theory gliders CMOS constant margin stability theory formalized Hal Crane Hank Coles rather antique still valid presentation Bud Tenny helped make CMOS height fashion theory accounts way wing tail aspect ratio tail area tail moment arm affect longitudinal sta bility Its long story Dick applied CMOS theory Lee Hines Sweepette 16 discovered 63% CG posi tion Lee used corresponded zero mar gin stability MOS Dick calculated CG position Fluf Duf zero MOS48% set up way nounced new-found old theory club Thermaleers St Louis Friday set site record Sunday Time will tell whether zero MOS best value point some gliders seem fly markedly better CG much farther forward War/i down left ung u/i Onr{9fft U 1 c-9rain Wah 3h t M7 RicI-IAPD I4AR0A5TL5 MOD/f/ED FL UF- DUE #IY 64~ 5 ght think Dick supplied following additional information about modified Fluf Duf model launched straight up 48% CG model flew noticeably faster its sink rate lower John Gard sug gested turbulators Dick says has no way knowing whether help glide likes pattern left climb left glide opposite Belieffs setup left wing has camber right Both tips washed out Down flap warped left trailing edge about half way out up flap right Wing sanded /8 sheet camber cracked along high point held way jig Edge-Joining Balsa Sheets Joining two sheets together form wider can pain particularly sheets thin way eliminate often used array pins weights have used join sheets thin 0025 Pennyplane props Im sure would work thinner material 5 Aav TAPE __ T0 / 4 First course edges must trued aid accurate straightedge thicker sheets applying glue di rectly tube ok helps April 1976 77 FF Duration continued slot plastic nozzle slightly wider thickness sheet thin sheets prefer following procedure Run out bead glue along workbench smooth uniformly thin thickness balsa scrap dip edge sheet comes magic inherent elasticity masking drafting tape used supply clamp ing force After applying glue place sheets together edge-to-edge over strip Saran Wrap Tear off piece tape bit wider total width sheets Stretch tape between thumbs press sticky side onto sheet short distance joined edges relax pull tape tape will pull joint tight Finally pull ends tape over outer edges sheet stick workboard Repeat appropriate inter vals along joint joining wide sheets might pre fer use short strips tape weights hold joint flat glue sets thicker sheets apply tape both sides joint Coupe Prop Since prop carving enigma neophite rubber-power modelers almost-ready-to-fly prop Coupe dHiver small Unlimited Rub ber class models will come welcome news pair molded sheet balsa blades shaped outline may obtained $300 two $250 post paid Blue Ridge Models PO Box 9188 Asheville NC 28805 Complete structions included finishing mounting Z-wire hub popular types some modelers ques tion stability molded blades have some have spent 15 winters well ventilated unheated garage show ing measurable change pitch molded blades stronger carved blades because grain runs right way throughout blade Balsa Stripper Ray Harlan manufac tures balsa stripper thats ideal cutting thin odd-size strips used con struction Indoor models Peanut Scale like Similar developed Erv Rodemsky features micrometers adjusting position heavy alumi num straightedge well machined razor blade holder ensure square edges accurate widths cuts tapered strips easily straight ones mean pur pose price $1800 plus postage R Harlan 15 Happy Hollow Rd Wayland Mass 01778 New Wood Supplier dont know anyone world would want 5 ft long piece 1/16 sq balsa spruce wanted hundred other un usual sizes place look would Superior Aircraft Materials PO Box 8082 Long Beach CA 90808 Sizes such 1/20 sheet 1/64 square 1/20 square 1/20 X 1/40 1/40 sheet just few sizes stocked lengths range 18 5 ft addition such unique sizes Superior handles standard sizes both spruce balsa plus bit plywood too prices sizes comparable same bit higher big-time suppliers quality Well obvious some precision Sal Taibi learned tool-anddie maker put Competition Models kits rubbed off son Mike runs Superior Works Write catalog sheets address 4200 Gregory St Oak land CA 94619 78 Model Aviation TRY SCALE ACCESSORIES KITS INE GUN KITS ENGINE KITS & CYLINDERS PILOTS LS PROPS & HANGERS SPINNERS INGS CANOPIES K COWLS ASK FOR OUR PRODUCTS AT YOUR DEALER OR SEND 25 FOR OUR CATALOG WILLIAMS BROS DEPT M 181 PAWNEE ST SAN MARCOSCA 92069 SAVE MONEY TROPHIES OR TROPHY PARTS STOCK CUSTOM engraving figures walnut marble cups hardware etc REQUEST PRICES TOM SUTOR TROPHIES Rt 2 Box X438A Avon Park FIa 33825 813 453-3470 imosx ready-to-ny molded blades tor oupe Ray Harlan manufactures balsa stripper dHiver now available Blue Ridge Mod- Features micrometer adjustments Its deluxe elswith Z-wire hub Details text item described fully article