Anyone for Autogiros?

I DO YOU THINK youve tried everything model aviation about giros Autogiro trademark name rotating-wing aircraft designed licensed Juan de la Cierva Spain other machines general type correctly termed gyroplanes will use word giro generic sense article rotor systems category aircraft mechanically powered rather blades driven relative wind elimin ates complexities associated Helicopters yet retains some benefits such safe slow flight nearly vertical landing capabilities giro also has distinct advantage over Helicopter case engine failure since always autorotating mode permitting gentle descent manner 78 Model Aviation IJ y II full-size giro Kellett KD-1 originally built 1935 rebuilt 1958 bid use crop-dusting power line inspection other industrial uses has rotor diameter 40 fL top speed 125 mph minimum speed 22 mph climb rate 1060 ft/mm parachute almost automatically spite apparent advantages giros seldom seen model form considering type has existed since about 1924 may seem strangeuntil actually tackles project Outwardly simple giros technically complex being acted upon numerous forces defy easy analysis Thus modelers have attempted giros have frustrated discouraged lack immediately favorable results have returned attentions gratifying pursuits Juan de Ia Cierva active model builder credited miniature experiments vital role perfecting invention Having experi enced repeated failures full-size Autogiros finally resolved some key problems aid small models During 1920s 1930s full-size Autogiros active model versions occasionally published books maga zines few marketed kit form Some static-scale display models others supposed fly some notable excep Co-author Shipp again time launching FF Peanut Scale C6 has flown both rubber CO-2 engine power tions barely-fliers just semi giros relied primarily upon huge fixed wings lift stability time fullsize giros featured abbreviated fixed wings few people questioned models equipped such appendages Unfortunately competition rules encouraged situation permitting enormous percentage total area form fixed-wing surfaces condition persists day Thus models appeared rotors contributed little except drag close-up Shipps C6 Peanut CO-2 en gine place Model flew better fixed ailerons removed December 1982 79 very realistic model Autogiro No its real thing Pitcairn PA-39 manufactured 1941 Specs 42 ft 3 rotor diameter 1996 lb gross weight 110 mph top speed 15mph minimum speed Plane still exists Though presently damaged will rebuilt Warren Shipp prepares launch Bill Hannans WRK Peanut FFgiro Full-size machine oper ated somewhat differenttheories atrue Autogiro Model mediocre flier Warren Shipps elegant Avro Avian C17 Mk Peanut-size Autogiro won Weirdo class years Indoor Peanut Grand Prix proxyflying Frank Scott Don Lindley managed 21-sec ROG Bostonian-class Pitcairn Warren Shipp has 16-in rotor ROGs consistently bridge table 23-sec flights have wingless inefficient rotors required lift obtained decor Wingless giro models did come forth time time apparently became lost shuffle remained Louis Garami versatile model designers time openly blow whistle long-term semi giro sham Garami bluntly pointed Out 1946 Air Trails ModelAnnual article some record-holding models would fly rotors removed fixed wings proceeded explain demonstrate efficiency wingless example Other wingless giros have published since last time saw local flying site Doubtless giros difficult understand adjust conven tional models can tamed offer great fun satisfaction process Besides non-successes may help keep us humble dont pretend have swers. questions cannot present iron-clad success formulas opinions However have managed achieve satis factory flights variety designs have compared notes several other giro enthusi asts May share experience encourage try giros should expect instant gratification first attempt patient willing experi menter can amply rewarded efforts learning about breed may care consider following categories Indoor Free Flight models have dis tinct advantage operating under nearly controlled air conditions outdoor vari eties greatly assists observation con sistency suitable site disposal such gymnasium auditorium hangar may best choice initial giro experi ments Indoor models generally rather deli cate usually powered rubber although CO-2 engines offer useful alternative form power Outdoor Free Flight somewhat rugged may powered rubber CO-2 engines electric motors usual gas engines Strictly own once launched require careful design adjust ment successful performance Kites Satisfactory kites employing rotors have long history both model man-carrying form offer interesting test platforms rotor study something fly windy days ControlLine captive approach minimises some stability problems associated 80 Model Aviation Everything laid Out testing session forAutogirosa variety types sizes readyto go together batch spare rotorswhich definitely recommended Model Autogiro expert Georges Chaulet snapped checking Out Warren Shipps simple giros during visitto San Diego Hes France Shipp background Helene Chaulet Antony France father Georges RC Synchrogyro 4 plane features intermeshing contra-rotating rotor blades Enva 35 power Its easily con trolled throttle rudder Pub lished September 1979 Model Builder Chaulet photo Co-author Hannan Georgyro based upon French design Has flown both two three-blade rotor configurations yncnrogyro Dy ieorges unaulet nasiwin Intermesning rotors Its Free Flight powered rubber motor Another RC giro constructed Georges Chaulet France Features include T-tail trike gear three-bladed rotor giros offers another way explore rotor design Scale Autogiros would also legal Navy Carrier event might require no arresting hook Limited top speed potential would likely severe handicap under present rules course Radio control Considering widespread popularity RC Helicopters scarcity giros remarkable Although few designs have published kitted much remains accomplished Control can via actuation rotor system aerodynamic surfaces combination both Flying Scale greatest challenge regardless category build fly non-Scale giro thing produce min iature flying reproduction specific full-size giro quite another. may represent difficult tasks modeling Very few seem have attempted least have received much coverage modeling press great pity considering vast variety full-size giro subjects have existed over years Full-size giros have constructed Spain England Scotland France Germany USA Japan Russia probably elsewhere have flown wide range configurations including tractors pushers radial in-line engines two three four-bladed rotors auxiliary wings tail-dragger tricycle landing gear jump-start capability and. well get message Certainly no shortage inspiring subjects documenta tion abounds ows look Autogiros radiate character can wonders attracting attention spectators mention jaded Scale judges Colors markings have ranged way vintage plain Jane through camouflage downright bizarre some employed aerial sign boards replete colorful logos slogans pilots equally colorful included likes Juan de la Cierva himself Frank Courtney Amelia Earhart Frank Hawks Assen Jordanoff George Townson incident ally presently writing book subject sufficient reader interest model giros expressed prepared offer comprehensive article dealing technicalities Scale information Meanwhile offer following suggestions may wish join fun Research Useful starting points finding full-size giro informaton Janes ones named Tired-Gyro simple pro file test model has modified times during several years flying Worlds Aircraft Aircraft Year Books especially 1 920s 1 930s editions Magazines such English Flight American Popular Aviation era also helpful Aero Modeller England MRA France Model Airplane News Flying Aces Air Trails published model giro articles during 1930s 1940s giros have sometimes appeared recentpublications including Model Aviation Model plans Free Flight indoor outdoor giro construction plans available PeckPolymers PO Box 2498 La Mesa CA 92041 along useful building supplies accessories complete catalog costs $100 Useful definitions new rotorcraft following terms may prove helpful Rotor system entire mechanical makeup parts required system rotating airfoils Rotor blade also vane airfoil element rotor system Advancing blade rotor turning blade blades moving same direction aircraft oncoming relative wind Retreating blade rotor turning blade blades moving opposite direction aircraft travel difference lift between advancing retreating blades must some way compensated giro will roll Hinges flexibility rotor system usual answers Coning flight flexible hinged rotor blades will rise angle similar appearance dihedral some models coning angle Continued page 82 Although Warren Shipps Stick-Gyro seems ultra-simple complexWell-known kit manufacturer Mark Smith RC Bensen-type giro aerodynamically Its capable 30-second flightsModel classified non-success 4 December 1982 81 very basic profile giro Bill Hannan reposes atop French model magazine featuring American Skip Ruffs RC Autogiro its cover Model giros can Control Line too CLAvro C6A Frank Scott featured January 1981 MA Has 049 power THUNDERBIRDS T-38 TALON F-7-F TIGERCATSUPER HUNTER 60 SIZE RC Kits Mfg IKiCi 706 Easton NE Canton OH 44721 SIG tadet MEl MElt ... 650 Kougar Kavalier Kommander 650 1-3 Clipped Wing Cub 700 Cessnal50 850 Citabria Skybolt 0 25 Bonanza Ceosna 172 Liberty Sport Smith Minibiplane it 00 RyanSTA 1200 IEMCO PT-tO FW 100 0-0 650 ARM-S Zero 850 AT6 North American 1050 l-tellcatThunderbolt Cornair 0 SBD-5 Manter Scale Serien 5 RADIAL COWLS 4rf'diameter 3/i' deep 650 5 'diameter- 3af'deep 650 7' diameter- 5/' deept100 10' diameter- 03k' deep diameter-6 'deep 2050 n/'diameter 7' deep 2200 Eight other nizen available 0000 SASE br complete lint PICA FW 190 0-9 Waco F-S1050 Cesona 182 Juogmeister 0 T-25bTrojan1600 TOP FLITE P-SO Airacobra750 Piper i-S CabB00 P-40 Warhawk000 P-470 ThunderbolttO00 P40-tA CorsairF8F-2 Bearcator A6M2Zerotl00 COWLS FOR OTHER KITS PILOT Coristen Eagle tB00 MIDWEST Pitto Special t500 STAFFORD 8-24 net 014 50 ASTRO FLIGHTPnrterlield 0 QUARTER SCALE BALSAUSAJ-SCub tS00 BALSA USA J-S Con w/engine tS00 CONCEPT Fleet Biplane tS00 i-S ENT Stionvo Voyager tS75 SIG i-S Cub 1300 w/engrne tS00 PILOT Decatolon Citabria tOSO BUD NOSEN i-S Cub w/engine tS00 Aeronca Champion1800 Citabria 0 11' pantn pr Mr Mulligan no blintern 2200 P-5tlull lengto cowl 2200 P-47 tall length Ilayn 00 WHEELPANTS 7' long br 5' wheel 825 to, long 4/o-5' wheel 50 10' long 4/r-5/r' balloon tire. 1600 13 long br 6-7'balloon tire 8' 9' 12' two ntylen 01 11' alno available send SASh br complete lint COWLS FOR PLANS Avaitanle br Behrenn Plan Service models Doc Matthews Schweizer I-SO Taylor Cab 6-2 Duarter Scale RC Gar mhaanenn Cap-20 $1050 9' pantn 61150 Hawker Tempest $3000 Mao Lunar Rocket $2500 windnhield $8 00 Doc Matthewn Taylor Cub 6-2 Citabria Monocoape 90-A Send SASE br com p1010 list TO ORDER Please add $150 shipping charge within US NY renidents add 70/0 nolen ton Outaide US send $100 comptete tint enact shipping charges PHONE ORDERS Accepted Irom 7-9 PM EDT call 516 665-8034 built rojor system Blade incidence chord-wiseangular set ting rotor blade Although full-size giros employ slight positive incidence model giros required negative blade incidence leading edges lower trailing edges Rotor disc incidence angular setting ofohe entire rotor system model form disc generally tipped slightly rearward Disc area full-size giro engineering compu tations entire area swept rotor blades considered lifting surface Solidity factor total area rotor blades relative disc area would appear area blades much greater importance model giros full-size prac tice Model objectives development success ful model giros following goals met 1 Stability lift obtained unpowered rotor systems 2 The craft should stable conditions flight 3 It should consistent performance predictable pattern flight 4 Duration should ample adequate flight evaluation 5 Model should relatively easy construct adjust 6 Models should easy repair will crash Suggestions 1 Start small 2 Stay simple 3 Build light 4 patient persistent 5 Keep records Power Dependability will greatly simplify experiements order preference 1 Rubber 2 CO-2 3 Electric 4 Diesel 5 Glow Suggested design parameters 1 Models employing two separate rotor sys tems easier fly single-rotor-system models challenging imagination Also vast majority full-size giros have employed single-rotor system 2 Short rotor diameter relative overall model length seem easier adjust fly 3 Although stiff rotor systems can made work flexible hinged systems fre quently employed 4 Flat flat-bottom-airfoil rotor blade air foils suitable Small models can employ simple sheet balsa blades 5 Four-blade systems easier fly three-blade layouts three-bladers much easier fly two-bladers Mechanical considerations. 1 Design permit ease adjustments 2 Arrange easy parts replacement es pecially rotor components Initial force setup Virtually model giro will undergo adjustments before will fly satis factorily some never ball park settings may serve useful starting points 1 Rotor blades 20 40 negative incidence 2 Rotor mast axle angle 40 100 aft vertical 20 30 side tilt may also employed some instances 3 Center gravity tocated near line projected downward along rotor axle axis 4 Stabilizer set 00 slight down elevator lifting section stabilizer sometimes employed 5 Propeller thrust line 00 20 30 downthrust rotor turns clockwise viewed top adjust model right-hand flight circle rotor turns counterclockwise adjust model left-hand flight circle Although some builders feel strongly way other have successfully flown models both types Testing relatively small models Start test glide walking wind 82 Model Aviation RCALE ACRO TRAINER 60 SIZE 1 DUOTED FAN F-106 DELTA DART FIBERGLASS MASTER DeptMA PO Box 134M Bayshore NY 11706 models nose held hight rotor has reached high rpm level model drop dont throw should settle nearly vertically power tests start fairly low power walk bring rotor up flying speed level model gently launch Rotor must have sufficient rpm generate proper lift roll resistance Rise-offground starts difficult model has properly adjustedvery unlikely successful untrimmed model Possible adjustments increase rotor rpm try 1 negative blade incidence 2 greater mast angle 3 different blade airfoil Thrust-line offsets rudder angles may used assist turn-circle adjustment although some designs rudder adjustment may have little effect Elevators may used ailerons help resist roll help adjust models turn circle Changes propeller diameter pitch can have profound effects both stability performacne Low-pitch props generally pre ferred Center gravity changes can useful cures including offset weight such ballast added landing gear leg assist turn Important experts agree Often several possible solutions trim problem dont afraid experiment make adjustment time Cures work conventional models may always job giros contrary some expressed opinions giros can stall spiral dive Above try become dis couraged ilures can educational too question marks contradicting theories missing links model giro field Grateful thanks following individuals have contributed either directly indirectly undertaking Georges Chaulet France PT Capon John Blagg England Ray Caswell Fred Weitzel Skipp Ruff Jack Headley USA late JD Gillies Scotland hope some readers will respond challenge produce some fresh answers let yourcomrades whirly world giros know successes failures Come let us go forth break blades together US Male/Haught Continued page 76 Coat wood surfaces coming contact covering two coats clear nitrate dope sanding between coats smooth raised grain Cut piece polyester approximate size lay structure Spray water household cleaning sprayer water doesnt shrink polyester sort relaxes makes cling structure wrinkles smoothed Out Lift edges fabric apply dope Smooth cloth back place trim excess sharp razor blade Allow dope dry thoroughly Covering may still damp Shrink fabric household iron set wool satisfied apply coat clear nitrate dope primer coat Finish five brushed coats clear butyrate dope Apply trim desired pigmented dope colored tissue affixed thinner before second third coats clear dope finish sprayed build up sufficient coats properly seal fabric fuel oil residue Miscellaneous Fabricate tail wheel assembly bending Vs-in music wire right angle fit grooved rudder base slip upper wheel collar NORTHERN CALIFORNIAS LARGEST DISCOUNT HOBBY SHOP 1/\1eII FUEL ou New high film strength lubncant increased power engine ide Highest quality ingredients DetereAnt action tn emit vornish h II II II II II II II II II I I I II II _______USE YOUftI MuCmd IHOURS Monday thru weonescay Ya5U-OU iflursday ay 930-8001 L miui y3060Sunday 1200-500J m mm m m December 1982 83 ULRIU tift- lit IUIiIVZ AT-6 TEXNick Ziroli s original Sport Scale WEngnes GIANT RIG SCALE * Beeotiiolly Molded Pibergioss Foselega1500 Sq AreaEINDECKER E-III * DntoilMolded Trensporen CenopyAn EasyteBoiid WWl Design an Wiener * Rogged Fiberglass Molded Engine Cowling Gosoele rot $27500 * Plywood Firewall Hordwere inolodedprs $1000 s5ppsg & PoedIteg55 Wingspan 35 45 Engines * Powod V dio Lending Gee Legs sp excess reIurtdeoPease ace $150 postage & hanOi es o Rolled Plens Instrortions reedests aod 7,Compete tsr $3495 N 55 deC15 00Cr 7 Iyireqe L GIN N E.7 HEAD LOCK Single Cyl $ 795 Twin Cyl $1195 1 Energizes glow plug thru remote jack 2Compatible existing HEAD LOCKs REMOTE 3Far cowled engines helicopters scale etc 4Uses HEAD LOCK pushtwist action 5 Weight- less 1/3 ounce PAT 4221452 /feote,leble nrrrndeocr acId 501 SI GiatSrdn US MODEL PRODUCTS CORR BOX 314 Pompton Plains NJ 07444

I DO YOU THINK youve tried everything model aviation about giros Autogiro trademark name rotating-wing aircraft designed licensed Juan de la Cierva Spain other machines general type correctly termed gyroplanes will use word giro generic sense article rotor systems category aircraft mechanically powered rather blades driven relative wind elimin ates complexities associated Helicopters yet retains some benefits such safe slow flight nearly vertical landing capabilities giro also has distinct advantage over Helicopter case engine failure since always autorotating mode permitting gentle descent manner 78 Model Aviation IJ y II full-size giro Kellett KD-1 originally built 1935 rebuilt 1958 bid use crop-dusting power line inspection other industrial uses has rotor diameter 40 fL top speed 125 mph minimum speed 22 mph climb rate 1060 ft/mm parachute almost automatically spite apparent advantages giros seldom seen model form considering type has existed since about 1924 may seem strangeuntil actually tackles project Outwardly simple giros technically complex being acted upon numerous forces defy easy analysis Thus modelers have attempted giros have frustrated discouraged lack immediately favorable results have returned attentions gratifying pursuits Juan de Ia Cierva active model builder credited miniature experiments vital role perfecting invention Having experi enced repeated failures full-size Autogiros finally resolved some key problems aid small models During 1920s 1930s full-size Autogiros active model versions occasionally published books maga zines few marketed kit form Some static-scale display models others supposed fly some notable excep Co-author Shipp again time launching FF Peanut Scale C6 has flown both rubber CO-2 engine power tions barely-fliers just semi giros relied primarily upon huge fixed wings lift stability time fullsize giros featured abbreviated fixed wings few people questioned models equipped such appendages Unfortunately competition rules encouraged situation permitting enormous percentage total area form fixed-wing surfaces condition persists day Thus models appeared rotors contributed little except drag close-up Shipps C6 Peanut CO-2 en gine place Model flew better fixed ailerons removed December 1982 79 very realistic model Autogiro No its real thing Pitcairn PA-39 manufactured 1941 Specs 42 ft 3 rotor diameter 1996 lb gross weight 110 mph top speed 15mph minimum speed Plane still exists Though presently damaged will rebuilt Warren Shipp prepares launch Bill Hannans WRK Peanut FFgiro Full-size machine oper ated somewhat differenttheories atrue Autogiro Model mediocre flier Warren Shipps elegant Avro Avian C17 Mk Peanut-size Autogiro won Weirdo class years Indoor Peanut Grand Prix proxyflying Frank Scott Don Lindley managed 21-sec ROG Bostonian-class Pitcairn Warren Shipp has 16-in rotor ROGs consistently bridge table 23-sec flights have wingless inefficient rotors required lift obtained decor Wingless giro models did come forth time time apparently became lost shuffle remained Louis Garami versatile model designers time openly blow whistle long-term semi giro sham Garami bluntly pointed Out 1946 Air Trails ModelAnnual article some record-holding models would fly rotors removed fixed wings proceeded explain demonstrate efficiency wingless example Other wingless giros have published since last time saw local flying site Doubtless giros difficult understand adjust conven tional models can tamed offer great fun satisfaction process Besides non-successes may help keep us humble dont pretend have swers. questions cannot present iron-clad success formulas opinions However have managed achieve satis factory flights variety designs have compared notes several other giro enthusi asts May share experience encourage try giros should expect instant gratification first attempt patient willing experi menter can amply rewarded efforts learning about breed may care consider following categories Indoor Free Flight models have dis tinct advantage operating under nearly controlled air conditions outdoor vari eties greatly assists observation con sistency suitable site disposal such gymnasium auditorium hangar may best choice initial giro experi ments Indoor models generally rather deli cate usually powered rubber although CO-2 engines offer useful alternative form power Outdoor Free Flight somewhat rugged may powered rubber CO-2 engines electric motors usual gas engines Strictly own once launched require careful design adjust ment successful performance Kites Satisfactory kites employing rotors have long history both model man-carrying form offer interesting test platforms rotor study something fly windy days ControlLine captive approach minimises some stability problems associated 80 Model Aviation Everything laid Out testing session forAutogirosa variety types sizes readyto go together batch spare rotorswhich definitely recommended Model Autogiro expert Georges Chaulet snapped checking Out Warren Shipps simple giros during visitto San Diego Hes France Shipp background Helene Chaulet Antony France father Georges RC Synchrogyro 4 plane features intermeshing contra-rotating rotor blades Enva 35 power Its easily con trolled throttle rudder Pub lished September 1979 Model Builder Chaulet photo Co-author Hannan Georgyro based upon French design Has flown both two three-blade rotor configurations yncnrogyro Dy ieorges unaulet nasiwin Intermesning rotors Its Free Flight powered rubber motor Another RC giro constructed Georges Chaulet France Features include T-tail trike gear three-bladed rotor giros offers another way explore rotor design Scale Autogiros would also legal Navy Carrier event might require no arresting hook Limited top speed potential would likely severe handicap under present rules course Radio control Considering widespread popularity RC Helicopters scarcity giros remarkable Although few designs have published kitted much remains accomplished Control can via actuation rotor system aerodynamic surfaces combination both Flying Scale greatest challenge regardless category build fly non-Scale giro thing produce min iature flying reproduction specific full-size giro quite another. may represent difficult tasks modeling Very few seem have attempted least have received much coverage modeling press great pity considering vast variety full-size giro subjects have existed over years Full-size giros have constructed Spain England Scotland France Germany USA Japan Russia probably elsewhere have flown wide range configurations including tractors pushers radial in-line engines two three four-bladed rotors auxiliary wings tail-dragger tricycle landing gear jump-start capability and. well get message Certainly no shortage inspiring subjects documenta tion abounds ows look Autogiros radiate character can wonders attracting attention spectators mention jaded Scale judges Colors markings have ranged way vintage plain Jane through camouflage downright bizarre some employed aerial sign boards replete colorful logos slogans pilots equally colorful included likes Juan de la Cierva himself Frank Courtney Amelia Earhart Frank Hawks Assen Jordanoff George Townson incident ally presently writing book subject sufficient reader interest model giros expressed prepared offer comprehensive article dealing technicalities Scale information Meanwhile offer following suggestions may wish join fun Research Useful starting points finding full-size giro informaton Janes ones named Tired-Gyro simple pro file test model has modified times during several years flying Worlds Aircraft Aircraft Year Books especially 1 920s 1 930s editions Magazines such English Flight American Popular Aviation era also helpful Aero Modeller England MRA France Model Airplane News Flying Aces Air Trails published model giro articles during 1930s 1940s giros have sometimes appeared recentpublications including Model Aviation Model plans Free Flight indoor outdoor giro construction plans available PeckPolymers PO Box 2498 La Mesa CA 92041 along useful building supplies accessories complete catalog costs $100 Useful definitions new rotorcraft following terms may prove helpful Rotor system entire mechanical makeup parts required system rotating airfoils Rotor blade also vane airfoil element rotor system Advancing blade rotor turning blade blades moving same direction aircraft oncoming relative wind Retreating blade rotor turning blade blades moving opposite direction aircraft travel difference lift between advancing retreating blades must some way compensated giro will roll Hinges flexibility rotor system usual answers Coning flight flexible hinged rotor blades will rise angle similar appearance dihedral some models coning angle Continued page 82 Although Warren Shipps Stick-Gyro seems ultra-simple complexWell-known kit manufacturer Mark Smith RC Bensen-type giro aerodynamically Its capable 30-second flightsModel classified non-success 4 December 1982 81 very basic profile giro Bill Hannan reposes atop French model magazine featuring American Skip Ruffs RC Autogiro its cover Model giros can Control Line too CLAvro C6A Frank Scott featured January 1981 MA Has 049 power THUNDERBIRDS T-38 TALON F-7-F TIGERCATSUPER HUNTER 60 SIZE RC Kits Mfg IKiCi 706 Easton NE Canton OH 44721 SIG tadet MEl MElt ... 650 Kougar Kavalier Kommander 650 1-3 Clipped Wing Cub 700 Cessnal50 850 Citabria Skybolt 0 25 Bonanza Ceosna 172 Liberty Sport Smith Minibiplane it 00 RyanSTA 1200 IEMCO PT-tO FW 100 0-0 650 ARM-S Zero 850 AT6 North American 1050 l-tellcatThunderbolt Cornair 0 SBD-5 Manter Scale Serien 5 RADIAL COWLS 4rf'diameter 3/i' deep 650 5 'diameter- 3af'deep 650 7' diameter- 5/' deept100 10' diameter- 03k' deep diameter-6 'deep 2050 n/'diameter 7' deep 2200 Eight other nizen available 0000 SASE br complete lint PICA FW 190 0-9 Waco F-S1050 Cesona 182 Juogmeister 0 T-25bTrojan1600 TOP FLITE P-SO Airacobra750 Piper i-S CabB00 P-40 Warhawk000 P-470 ThunderbolttO00 P40-tA CorsairF8F-2 Bearcator A6M2Zerotl00 COWLS FOR OTHER KITS PILOT Coristen Eagle tB00 MIDWEST Pitto Special t500 STAFFORD 8-24 net 014 50 ASTRO FLIGHTPnrterlield 0 QUARTER SCALE BALSAUSAJ-SCub tS00 BALSA USA J-S Con w/engine tS00 CONCEPT Fleet Biplane tS00 i-S ENT Stionvo Voyager tS75 SIG i-S Cub 1300 w/engrne tS00 PILOT Decatolon Citabria tOSO BUD NOSEN i-S Cub w/engine tS00 Aeronca Champion1800 Citabria 0 11' pantn pr Mr Mulligan no blintern 2200 P-5tlull lengto cowl 2200 P-47 tall length Ilayn 00 WHEELPANTS 7' long br 5' wheel 825 to, long 4/o-5' wheel 50 10' long 4/r-5/r' balloon tire. 1600 13 long br 6-7'balloon tire 8' 9' 12' two ntylen 01 11' alno available send SASh br complete lint COWLS FOR PLANS Avaitanle br Behrenn Plan Service models Doc Matthews Schweizer I-SO Taylor Cab 6-2 Duarter Scale RC Gar mhaanenn Cap-20 $1050 9' pantn 61150 Hawker Tempest $3000 Mao Lunar Rocket $2500 windnhield $8 00 Doc Matthewn Taylor Cub 6-2 Citabria Monocoape 90-A Send SASE br com p1010 list TO ORDER Please add $150 shipping charge within US NY renidents add 70/0 nolen ton Outaide US send $100 comptete tint enact shipping charges PHONE ORDERS Accepted Irom 7-9 PM EDT call 516 665-8034 built rojor system Blade incidence chord-wiseangular set ting rotor blade Although full-size giros employ slight positive incidence model giros required negative blade incidence leading edges lower trailing edges Rotor disc incidence angular setting ofohe entire rotor system model form disc generally tipped slightly rearward Disc area full-size giro engineering compu tations entire area swept rotor blades considered lifting surface Solidity factor total area rotor blades relative disc area would appear area blades much greater importance model giros full-size prac tice Model objectives development success ful model giros following goals met 1 Stability lift obtained unpowered rotor systems 2 The craft should stable conditions flight 3 It should consistent performance predictable pattern flight 4 Duration should ample adequate flight evaluation 5 Model should relatively easy construct adjust 6 Models should easy repair will crash Suggestions 1 Start small 2 Stay simple 3 Build light 4 patient persistent 5 Keep records Power Dependability will greatly simplify experiements order preference 1 Rubber 2 CO-2 3 Electric 4 Diesel 5 Glow Suggested design parameters 1 Models employing two separate rotor sys tems easier fly single-rotor-system models challenging imagination Also vast majority full-size giros have employed single-rotor system 2 Short rotor diameter relative overall model length seem easier adjust fly 3 Although stiff rotor systems can made work flexible hinged systems fre quently employed 4 Flat flat-bottom-airfoil rotor blade air foils suitable Small models can employ simple sheet balsa blades 5 Four-blade systems easier fly three-blade layouts three-bladers much easier fly two-bladers Mechanical considerations. 1 Design permit ease adjustments 2 Arrange easy parts replacement es pecially rotor components Initial force setup Virtually model giro will undergo adjustments before will fly satis factorily some never ball park settings may serve useful starting points 1 Rotor blades 20 40 negative incidence 2 Rotor mast axle angle 40 100 aft vertical 20 30 side tilt may also employed some instances 3 Center gravity tocated near line projected downward along rotor axle axis 4 Stabilizer set 00 slight down elevator lifting section stabilizer sometimes employed 5 Propeller thrust line 00 20 30 downthrust rotor turns clockwise viewed top adjust model right-hand flight circle rotor turns counterclockwise adjust model left-hand flight circle Although some builders feel strongly way other have successfully flown models both types Testing relatively small models Start test glide walking wind 82 Model Aviation RCALE ACRO TRAINER 60 SIZE 1 DUOTED FAN F-106 DELTA DART FIBERGLASS MASTER DeptMA PO Box 134M Bayshore NY 11706 models nose held hight rotor has reached high rpm level model drop dont throw should settle nearly vertically power tests start fairly low power walk bring rotor up flying speed level model gently launch Rotor must have sufficient rpm generate proper lift roll resistance Rise-offground starts difficult model has properly adjustedvery unlikely successful untrimmed model Possible adjustments increase rotor rpm try 1 negative blade incidence 2 greater mast angle 3 different blade airfoil Thrust-line offsets rudder angles may used assist turn-circle adjustment although some designs rudder adjustment may have little effect Elevators may used ailerons help resist roll help adjust models turn circle Changes propeller diameter pitch can have profound effects both stability performacne Low-pitch props generally pre ferred Center gravity changes can useful cures including offset weight such ballast added landing gear leg assist turn Important experts agree Often several possible solutions trim problem dont afraid experiment make adjustment time Cures work conventional models may always job giros contrary some expressed opinions giros can stall spiral dive Above try become dis couraged ilures can educational too question marks contradicting theories missing links model giro field Grateful thanks following individuals have contributed either directly indirectly undertaking Georges Chaulet France PT Capon John Blagg England Ray Caswell Fred Weitzel Skipp Ruff Jack Headley USA late JD Gillies Scotland hope some readers will respond challenge produce some fresh answers let yourcomrades whirly world giros know successes failures Come let us go forth break blades together US Male/Haught Continued page 76 Coat wood surfaces coming contact covering two coats clear nitrate dope sanding between coats smooth raised grain Cut piece polyester approximate size lay structure Spray water household cleaning sprayer water doesnt shrink polyester sort relaxes makes cling structure wrinkles smoothed Out Lift edges fabric apply dope Smooth cloth back place trim excess sharp razor blade Allow dope dry thoroughly Covering may still damp Shrink fabric household iron set wool satisfied apply coat clear nitrate dope primer coat Finish five brushed coats clear butyrate dope Apply trim desired pigmented dope colored tissue affixed thinner before second third coats clear dope finish sprayed build up sufficient coats properly seal fabric fuel oil residue Miscellaneous Fabricate tail wheel assembly bending Vs-in music wire right angle fit grooved rudder base slip upper wheel collar NORTHERN CALIFORNIAS LARGEST DISCOUNT HOBBY SHOP 1/\1eII FUEL ou New high film strength lubncant increased power engine ide Highest quality ingredients DetereAnt action tn emit vornish h II II II II II II II II II I I I II II _______USE YOUftI MuCmd IHOURS Monday thru weonescay Ya5U-OU iflursday ay 930-8001 L miui y3060Sunday 1200-500J m mm m m December 1982 83 ULRIU tift- lit IUIiIVZ AT-6 TEXNick Ziroli s original Sport Scale WEngnes GIANT RIG SCALE * Beeotiiolly Molded Pibergioss Foselega1500 Sq AreaEINDECKER E-III * DntoilMolded Trensporen CenopyAn EasyteBoiid WWl Design an Wiener * Rogged Fiberglass Molded Engine Cowling Gosoele rot $27500 * Plywood Firewall Hordwere inolodedprs $1000 s5ppsg & PoedIteg55 Wingspan 35 45 Engines * Powod V dio Lending Gee Legs sp excess reIurtdeoPease ace $150 postage & hanOi es o Rolled Plens Instrortions reedests aod 7,Compete tsr $3495 N 55 deC15 00Cr 7 Iyireqe L GIN N E.7 HEAD LOCK Single Cyl $ 795 Twin Cyl $1195 1 Energizes glow plug thru remote jack 2Compatible existing HEAD LOCKs REMOTE 3Far cowled engines helicopters scale etc 4Uses HEAD LOCK pushtwist action 5 Weight- less 1/3 ounce PAT 4221452 /feote,leble nrrrndeocr acId 501 SI GiatSrdn US MODEL PRODUCTS CORR BOX 314 Pompton Plains NJ 07444