NO OCR TEXT ONE OF THE neglected types Radio Control models Autogiro possibly because falls somewhere between Helicopter conventional fixed-wing model per formance yet its interesting challenge provides exciting days flying will fly wont fact some Autogiro projects dont dare visit regular flying field until Ive made few secret fligits elsewhere idea article look current state RC Autogiro hope stimulate interest type model well see few rotating wings flying field will seen article progresses challenges types builders herefrom modeler full machine shop type interest cut balsa razor blade myself example Well look three basic types Autogiro simple single rotor whih turns out the-most complex invented Cierva twin intermeshing type developed full-scale Flettner Focke-Achgelis Fa 61 type twin side-by-side rotors Single Rotor Autogiro single rotor Free Flight Autogiro has around quite some time can made fly well RC version has however easy develop go along same learning curve Cierva developing full-scale Autogiro Fig 1 shows idealized single rotor model rotor spinning counterclockwise model flies forward rotor lift becomes unbalanced model will roll left fact certain rotor revs flight speeds left side rotor can product no lift Free Flight models essentially fly speed turn direction rolling moment can trimmed out flexible rotor hub shaft RC model flies various speeds turns direction trimming problem easy Some designers have overcome adding large conven tional wing aileron control really cheating think correct approach mechanize rotor blades rotor forces controlled flier objective easy say too easy accomplish task model Autogiro builder duplicate miniature system Cierva developed flapping blades drag hinges tilting rotor head Thats formid able project investigator reports took Table Suggested Values Twin Rotor Autogiro UnitItemSuggested Value ARotor diameterDepends engine size See graph BTail area square inches34 4 times rotor diameter CTail arm inches075 10 times rotor diameter oRotor support angle wing dihedral5 lOdeg ERotor sweep-back angle5 10 deg FCenter gravity locationOn rotor axis final location found flight tests GRotor blade pitch angle2 deg 3 deg November1981 73 nutru S uau LCI Oa,tata uw urn i a. channel rudder-only autogiro author examines early designs before mixing upthe smog overSepulveda Basin cziz Fig 1 Single rotor configuration Fig 2 Twin intermeshing rotors Control Robin rudder throttle two blade pitch controls modeler task producing success ful single rotor Autogiro now much reduced really consists using pieces readily-available model Helicopter world imagine items crashed Helicopters hope arent too numerous could cheaply obtained easily adapted model Autogiro however interests lay doing little machining work modeling activities next type will probably appeal Germany during 1930s Helicopter Anton Flettner has used US Kellett Kaman adapt system model Autogiro two blades must geared together somehow dont run other rotor shafts canted outward blades can actually rotate general system resembles eggbeater sometimes called name However problems great diffi Intermeshing Rotor Autogiro second somewhat less complicated type intermeshing twin rotor Synchropter see Fig 2 concept successfully developed Adequate spac ing required Typical fuse section Flexible sections bearings Bevel gears Plain gears Fig 3 Rotor system using bevel gears four years develop such system before successful flights made another writing March 1979 issue magazine showed system 87 pieces rotor passive head trimmable ground Thanks development work done model Helicopter can save much effort nowadays simply adapting Helicopter head Autogiro using cyclic collec tive pitch control model fact Japanese model Helicopter manufacturers selling such Autogiro kit Kalt Robin Gyrocopter model type plane James Bond cavorted around 74 Model Aviation / 7Fig 5 Twin side-by-side rotor configuration Fig 4 Rotor system using flexible shafts culty Ref 1 shows details successful French design Fig 3 shows models rotor arrangement gears located actual metalwork probably within capability modelers largest problem see Find suitable set angled gears anyone interested type would suggest first task would obtain gears design rest system around angled gears available another approach shown Fig 4 small length flexible cable introduced rotor shafts enables straight gears used type Autogiro -Continued page 137 Wheels really necessary model easily hand-launched comes down almost vertically engine cuts out typical four-bladed rotor Ply 1/16 plates both sides blades provide support rotor bearing No blade airfoil needed Left rotor 900 right outside surface frame can also inset give smooth outer surface An alternate method has thin plywood styrene plastic frame cutouts windows clear plastic windows glued inner surface opening approaches scale appearance Another suggestion framing use plastic adhesive tape such stretchy waterproof type comes widths colors odd shape width needed length tape can stuck down hard surface styrene example exact shape cut sharppointed blade Simply lift off surface transfer piece model can shifted around get exact fit best paint tape after applied model Like Epoxolite mentioned earlier tape has adIve no experience Ive built single rotor type both Free Flight RC no success RC version side-by-side rotor types can see photos lack experience doesnt prevent making couple comments first system must lead reduced efficiency lift produced must inversely propor tional cant angle rotor greater cant less efficient system must other point concerns lateral stability outward cantof rotors represents awing large anhedral can turns made flight Maybe reader could shed some light latter point Twin Side-by-Side Rotor Autogiro last type Ill discuss twin side-by-side rotor system illustrated Fig 5 Several plans have published Autogiros config uration easiest type insofar construction concerned requires same level building skill simple fixed-wing conventional RC model Having two counter-rotating rotors means lateral balance achieved Canting rotors inward provides dihedral effect similar normal wing rotors themselves can built flat makes easy construction can made simple cruciform THEANTIC BIPEBY DodOi REAL SHOW STOPPER & CROWD PLEASER STATTTESSATOTLCBACBOUSTLOAFTSC TAKE ACCA B LANE TEES SUB ESThEBELA EAST SOC CAN ECTIT LEASBAS BASEST BA FIT ASTS TEB Err SCALE COBSSSTJCTTOB SUBOLAT CUTSTT AlAS BASAlTS SAT FLAT SEBTACE ALL CATTY ASAUTUCELCA FITAIBAB ETC STE BEBASSSEAATBT TST ESSESESEETS Ar SCALE CASSTTUCAIAA SWAT TLAATS ATE AAATLABLE FAT SEACTABC ACTTAFTSBLABLC STAB TEST SQ TB ATBA ATTATT TN SCABAETASSA ITS ES AILL BESET TB EBBLE FOWETTCSAB TAATCWIBAS BE ETBOCABUC IBTrBBTEITBAATAFPBEATBASTE BISATAC LOBEE EBB BITE EBSCSEBE ABEB BI AA AC CTACTAA CBT COBI CO BAA STAT SAN ATEGA CALIF TETAL SEIBS BETEBE BET CATS TEST C ASEAT CT SEE STEEL CE STIlT November 1981 137 SAILPLANES R/C COMPETITION & SPORT SCALE R/C JEMCO SPORT SCALE BALSA COVERED POAM WING CORES vantage can form compound curves fillets Autogiros H eadley Continued page 74 CUSTOM TUNED ENGINES COMPETITION 4CCESSORIES Specialists custom TD 049/051 reed engines Throttled TD s available Complete inventory individual stock Custom parts Cox TD 020 049 061 & 09 engines Exclusive distributor Nelson 15 engine parts Hard-to-get Items such Custom needle valves racing wheels quick fills fuel shut-a ffs solid control lines others detailed brochure send 25 cents Kustom Kraftsmanship Box 2699 Laguna Hills CA 92653 Ph 714 830-5162 QUICK N EASY CUT-OUT PATTERN-PLANS Can Cut & Assembled Evening Stand-Up Flight Box $695 No Measur ng Needed TO BUILD Trace Assemble DESIGNED TO HOLD Fuel tank Trans ter Battery Fuse Hold adi Tools etc Legs Removable 21 s 12 x 39 Send SELECT PRODUCTS PO Box 259 Palo Cedro CA 96073 large Helicopter head [he Kalt model has flexible drive wheels rotor speed up distinctive sound air. Technopowers 7 cylinder 4 cycle Radial Engine Send $200 catalog products TECHNOPOWERH INC 16650 South 104th AVENUE ORLAND PARK ILLINOIS 60462 Winning Ideas FOURMOST FUEL MANIFOLD 141FUEL SHUT OFFSmall Fuel Fitting Set Manifold Provides ConvenientCan Used Control FuelSize 4 10 PRICE $150 Method Tank Filling Draining andFlow Starting1 Tee 2 Elbows 1 Pen B adde Tee Priming Positive Airborn Shutoff % 0PRICE $125PRICE $4 20 %ANDiODSTRUT FAIRINGS Comes twoII 23 LengthsCl] cock itfl -Two Sizes coffiwig% k 10Large Fue F tt ng Set Packaged Ft SizePRICE 17Size % IDPRCE $200 21 Tee 1 Elbow 1 Union 1 Plug PRICE $2 2 lengths eitlgbr size $270Both Made Fuei Proof Polyethyleoe Send SASE Complete Information FOUR MOST 4040 24th Ave Forest Grove OR 97116 PRODUCTS Phone 503 357-2732 shape automatically sets blade pitchdiameter assuming two blades will anglearound 50 layout modem Heli copter should work Some sort help needed During single-channel phasesto spin up rotor fortakeoff avoid enormous built several modelsfrom simple sheettakeoff distances rotor friction seems profile fuselages Scale Helicopter designs rudder control can see photos sort configuration possible single-channel model current effort two-channel rudder elevator Cox 05 1-powered model based contemporary ultra-light aircraft Weedhopper Fig 6 shows design Ive called Grasshopper should flying soon Designing Own Autogiro Single Rotor Type heavyweight model full con trolability least four channels needed puts engine 35-40 size Rotor Twin Intermesahing Rotor Type Theres very little data type model configura tion Ref 1 uses similar engine size rotor diameter data given above About drawback layout type model has very tall canted-down rotors dont hit ground Twin Side-by-Side Rotor Autogiro As easiest type put air theres quite bit data around help scratch-builder looking through collection model mags Ive able obtain lot dimensional information Ive summarized table use data first requires estimate number channels used turn fixes engine size example 049 engine will probably handle rudder engine elevator rudder control engine around 20 30 will needed Fig 7 shows typical twin rotor layout pertinent dimensions called Out letters Use coriunction table Fig 8 shows rotor c1ianleter function engine size next t ep after choosing engine find rotor i iameter table allows tail area B tail arm C obtained wing dihedral rotor axis tilt angles D E both 50100 region about information needed make initial layout drawing CG center gravity location near intersection rotor axis thrust line some designers say little front some little behind best location will found flight testing couple construction hints rotor pitch angles can set either using twisted aluminum hub using technique Ref 3 shown Fig 9 blade overlaps other give rotor pitch angle around two three degrees rotors could mounted old Cox engine crankcases crankshafts 020 small models 049 larger types simple wire axles Final Word Ive time space very brief survey RC Autogiro fully detailed study would probably have taken up whole magazine hope may have aroused interest type model may encourage try hand building something As said beginning theres something everyone youd like information want pass own data write Ill pleased hear Jack Headley 5640 Scotwood Dr. Rancho Palos Verdes CA 90274 References Synchrogyro Model Builder Sept 1979 2 P./CAutogyroRCMandE April1975 3 Twin Gyro 4eromodeller March 1975 Fig 6 Grasshopper 138 Model Aviation
Edition: Model Aviation - 1981/11
Page Numbers: 72, 73, 74, 137, 138
NO OCR TEXT ONE OF THE neglected types Radio Control models Autogiro possibly because falls somewhere between Helicopter conventional fixed-wing model per formance yet its interesting challenge provides exciting days flying will fly wont fact some Autogiro projects dont dare visit regular flying field until Ive made few secret fligits elsewhere idea article look current state RC Autogiro hope stimulate interest type model well see few rotating wings flying field will seen article progresses challenges types builders herefrom modeler full machine shop type interest cut balsa razor blade myself example Well look three basic types Autogiro simple single rotor whih turns out the-most complex invented Cierva twin intermeshing type developed full-scale Flettner Focke-Achgelis Fa 61 type twin side-by-side rotors Single Rotor Autogiro single rotor Free Flight Autogiro has around quite some time can made fly well RC version has however easy develop go along same learning curve Cierva developing full-scale Autogiro Fig 1 shows idealized single rotor model rotor spinning counterclockwise model flies forward rotor lift becomes unbalanced model will roll left fact certain rotor revs flight speeds left side rotor can product no lift Free Flight models essentially fly speed turn direction rolling moment can trimmed out flexible rotor hub shaft RC model flies various speeds turns direction trimming problem easy Some designers have overcome adding large conven tional wing aileron control really cheating think correct approach mechanize rotor blades rotor forces controlled flier objective easy say too easy accomplish task model Autogiro builder duplicate miniature system Cierva developed flapping blades drag hinges tilting rotor head Thats formid able project investigator reports took Table Suggested Values Twin Rotor Autogiro UnitItemSuggested Value ARotor diameterDepends engine size See graph BTail area square inches34 4 times rotor diameter CTail arm inches075 10 times rotor diameter oRotor support angle wing dihedral5 lOdeg ERotor sweep-back angle5 10 deg FCenter gravity locationOn rotor axis final location found flight tests GRotor blade pitch angle2 deg 3 deg November1981 73 nutru S uau LCI Oa,tata uw urn i a. channel rudder-only autogiro author examines early designs before mixing upthe smog overSepulveda Basin cziz Fig 1 Single rotor configuration Fig 2 Twin intermeshing rotors Control Robin rudder throttle two blade pitch controls modeler task producing success ful single rotor Autogiro now much reduced really consists using pieces readily-available model Helicopter world imagine items crashed Helicopters hope arent too numerous could cheaply obtained easily adapted model Autogiro however interests lay doing little machining work modeling activities next type will probably appeal Germany during 1930s Helicopter Anton Flettner has used US Kellett Kaman adapt system model Autogiro two blades must geared together somehow dont run other rotor shafts canted outward blades can actually rotate general system resembles eggbeater sometimes called name However problems great diffi Intermeshing Rotor Autogiro second somewhat less complicated type intermeshing twin rotor Synchropter see Fig 2 concept successfully developed Adequate spac ing required Typical fuse section Flexible sections bearings Bevel gears Plain gears Fig 3 Rotor system using bevel gears four years develop such system before successful flights made another writing March 1979 issue magazine showed system 87 pieces rotor passive head trimmable ground Thanks development work done model Helicopter can save much effort nowadays simply adapting Helicopter head Autogiro using cyclic collec tive pitch control model fact Japanese model Helicopter manufacturers selling such Autogiro kit Kalt Robin Gyrocopter model type plane James Bond cavorted around 74 Model Aviation / 7Fig 5 Twin side-by-side rotor configuration Fig 4 Rotor system using flexible shafts culty Ref 1 shows details successful French design Fig 3 shows models rotor arrangement gears located actual metalwork probably within capability modelers largest problem see Find suitable set angled gears anyone interested type would suggest first task would obtain gears design rest system around angled gears available another approach shown Fig 4 small length flexible cable introduced rotor shafts enables straight gears used type Autogiro -Continued page 137 Wheels really necessary model easily hand-launched comes down almost vertically engine cuts out typical four-bladed rotor Ply 1/16 plates both sides blades provide support rotor bearing No blade airfoil needed Left rotor 900 right outside surface frame can also inset give smooth outer surface An alternate method has thin plywood styrene plastic frame cutouts windows clear plastic windows glued inner surface opening approaches scale appearance Another suggestion framing use plastic adhesive tape such stretchy waterproof type comes widths colors odd shape width needed length tape can stuck down hard surface styrene example exact shape cut sharppointed blade Simply lift off surface transfer piece model can shifted around get exact fit best paint tape after applied model Like Epoxolite mentioned earlier tape has adIve no experience Ive built single rotor type both Free Flight RC no success RC version side-by-side rotor types can see photos lack experience doesnt prevent making couple comments first system must lead reduced efficiency lift produced must inversely propor tional cant angle rotor greater cant less efficient system must other point concerns lateral stability outward cantof rotors represents awing large anhedral can turns made flight Maybe reader could shed some light latter point Twin Side-by-Side Rotor Autogiro last type Ill discuss twin side-by-side rotor system illustrated Fig 5 Several plans have published Autogiros config uration easiest type insofar construction concerned requires same level building skill simple fixed-wing conventional RC model Having two counter-rotating rotors means lateral balance achieved Canting rotors inward provides dihedral effect similar normal wing rotors themselves can built flat makes easy construction can made simple cruciform THEANTIC BIPEBY DodOi REAL SHOW STOPPER & CROWD PLEASER STATTTESSATOTLCBACBOUSTLOAFTSC TAKE ACCA B LANE TEES SUB ESThEBELA EAST SOC CAN ECTIT LEASBAS BASEST BA FIT ASTS TEB Err SCALE COBSSSTJCTTOB SUBOLAT CUTSTT AlAS BASAlTS SAT FLAT SEBTACE ALL CATTY ASAUTUCELCA FITAIBAB ETC STE BEBASSSEAATBT TST ESSESESEETS Ar SCALE CASSTTUCAIAA SWAT TLAATS ATE AAATLABLE FAT SEACTABC ACTTAFTSBLABLC STAB TEST SQ TB ATBA ATTATT TN SCABAETASSA ITS ES AILL BESET TB EBBLE FOWETTCSAB TAATCWIBAS BE ETBOCABUC IBTrBBTEITBAATAFPBEATBASTE BISATAC LOBEE EBB BITE EBSCSEBE ABEB BI AA AC CTACTAA CBT COBI CO BAA STAT SAN ATEGA CALIF TETAL SEIBS BETEBE BET CATS TEST C ASEAT CT SEE STEEL CE STIlT November 1981 137 SAILPLANES R/C COMPETITION & SPORT SCALE R/C JEMCO SPORT SCALE BALSA COVERED POAM WING CORES vantage can form compound curves fillets Autogiros H eadley Continued page 74 CUSTOM TUNED ENGINES COMPETITION 4CCESSORIES Specialists custom TD 049/051 reed engines Throttled TD s available Complete inventory individual stock Custom parts Cox TD 020 049 061 & 09 engines Exclusive distributor Nelson 15 engine parts Hard-to-get Items such Custom needle valves racing wheels quick fills fuel shut-a ffs solid control lines others detailed brochure send 25 cents Kustom Kraftsmanship Box 2699 Laguna Hills CA 92653 Ph 714 830-5162 QUICK N EASY CUT-OUT PATTERN-PLANS Can Cut & Assembled Evening Stand-Up Flight Box $695 No Measur ng Needed TO BUILD Trace Assemble DESIGNED TO HOLD Fuel tank Trans ter Battery Fuse Hold adi Tools etc Legs Removable 21 s 12 x 39 Send SELECT PRODUCTS PO Box 259 Palo Cedro CA 96073 large Helicopter head [he Kalt model has flexible drive wheels rotor speed up distinctive sound air. Technopowers 7 cylinder 4 cycle Radial Engine Send $200 catalog products TECHNOPOWERH INC 16650 South 104th AVENUE ORLAND PARK ILLINOIS 60462 Winning Ideas FOURMOST FUEL MANIFOLD 141FUEL SHUT OFFSmall Fuel Fitting Set Manifold Provides ConvenientCan Used Control FuelSize 4 10 PRICE $150 Method Tank Filling Draining andFlow Starting1 Tee 2 Elbows 1 Pen B adde Tee Priming Positive Airborn Shutoff % 0PRICE $125PRICE $4 20 %ANDiODSTRUT FAIRINGS Comes twoII 23 LengthsCl] cock itfl -Two Sizes coffiwig% k 10Large Fue F tt ng Set Packaged Ft SizePRICE 17Size % IDPRCE $200 21 Tee 1 Elbow 1 Union 1 Plug PRICE $2 2 lengths eitlgbr size $270Both Made Fuei Proof Polyethyleoe Send SASE Complete Information FOUR MOST 4040 24th Ave Forest Grove OR 97116 PRODUCTS Phone 503 357-2732 shape automatically sets blade pitchdiameter assuming two blades will anglearound 50 layout modem Heli copter should work Some sort help needed During single-channel phasesto spin up rotor fortakeoff avoid enormous built several modelsfrom simple sheettakeoff distances rotor friction seems profile fuselages Scale Helicopter designs rudder control can see photos sort configuration possible single-channel model current effort two-channel rudder elevator Cox 05 1-powered model based contemporary ultra-light aircraft Weedhopper Fig 6 shows design Ive called Grasshopper should flying soon Designing Own Autogiro Single Rotor Type heavyweight model full con trolability least four channels needed puts engine 35-40 size Rotor Twin Intermesahing Rotor Type Theres very little data type model configura tion Ref 1 uses similar engine size rotor diameter data given above About drawback layout type model has very tall canted-down rotors dont hit ground Twin Side-by-Side Rotor Autogiro As easiest type put air theres quite bit data around help scratch-builder looking through collection model mags Ive able obtain lot dimensional information Ive summarized table use data first requires estimate number channels used turn fixes engine size example 049 engine will probably handle rudder engine elevator rudder control engine around 20 30 will needed Fig 7 shows typical twin rotor layout pertinent dimensions called Out letters Use coriunction table Fig 8 shows rotor c1ianleter function engine size next t ep after choosing engine find rotor i iameter table allows tail area B tail arm C obtained wing dihedral rotor axis tilt angles D E both 50100 region about information needed make initial layout drawing CG center gravity location near intersection rotor axis thrust line some designers say little front some little behind best location will found flight testing couple construction hints rotor pitch angles can set either using twisted aluminum hub using technique Ref 3 shown Fig 9 blade overlaps other give rotor pitch angle around two three degrees rotors could mounted old Cox engine crankcases crankshafts 020 small models 049 larger types simple wire axles Final Word Ive time space very brief survey RC Autogiro fully detailed study would probably have taken up whole magazine hope may have aroused interest type model may encourage try hand building something As said beginning theres something everyone youd like information want pass own data write Ill pleased hear Jack Headley 5640 Scotwood Dr. Rancho Palos Verdes CA 90274 References Synchrogyro Model Builder Sept 1979 2 P./CAutogyroRCMandE April1975 3 Twin Gyro 4eromodeller March 1975 Fig 6 Grasshopper 138 Model Aviation
Edition: Model Aviation - 1981/11
Page Numbers: 72, 73, 74, 137, 138
NO OCR TEXT ONE OF THE neglected types Radio Control models Autogiro possibly because falls somewhere between Helicopter conventional fixed-wing model per formance yet its interesting challenge provides exciting days flying will fly wont fact some Autogiro projects dont dare visit regular flying field until Ive made few secret fligits elsewhere idea article look current state RC Autogiro hope stimulate interest type model well see few rotating wings flying field will seen article progresses challenges types builders herefrom modeler full machine shop type interest cut balsa razor blade myself example Well look three basic types Autogiro simple single rotor whih turns out the-most complex invented Cierva twin intermeshing type developed full-scale Flettner Focke-Achgelis Fa 61 type twin side-by-side rotors Single Rotor Autogiro single rotor Free Flight Autogiro has around quite some time can made fly well RC version has however easy develop go along same learning curve Cierva developing full-scale Autogiro Fig 1 shows idealized single rotor model rotor spinning counterclockwise model flies forward rotor lift becomes unbalanced model will roll left fact certain rotor revs flight speeds left side rotor can product no lift Free Flight models essentially fly speed turn direction rolling moment can trimmed out flexible rotor hub shaft RC model flies various speeds turns direction trimming problem easy Some designers have overcome adding large conven tional wing aileron control really cheating think correct approach mechanize rotor blades rotor forces controlled flier objective easy say too easy accomplish task model Autogiro builder duplicate miniature system Cierva developed flapping blades drag hinges tilting rotor head Thats formid able project investigator reports took Table Suggested Values Twin Rotor Autogiro UnitItemSuggested Value ARotor diameterDepends engine size See graph BTail area square inches34 4 times rotor diameter CTail arm inches075 10 times rotor diameter oRotor support angle wing dihedral5 lOdeg ERotor sweep-back angle5 10 deg FCenter gravity locationOn rotor axis final location found flight tests GRotor blade pitch angle2 deg 3 deg November1981 73 nutru S uau LCI Oa,tata uw urn i a. channel rudder-only autogiro author examines early designs before mixing upthe smog overSepulveda Basin cziz Fig 1 Single rotor configuration Fig 2 Twin intermeshing rotors Control Robin rudder throttle two blade pitch controls modeler task producing success ful single rotor Autogiro now much reduced really consists using pieces readily-available model Helicopter world imagine items crashed Helicopters hope arent too numerous could cheaply obtained easily adapted model Autogiro however interests lay doing little machining work modeling activities next type will probably appeal Germany during 1930s Helicopter Anton Flettner has used US Kellett Kaman adapt system model Autogiro two blades must geared together somehow dont run other rotor shafts canted outward blades can actually rotate general system resembles eggbeater sometimes called name However problems great diffi Intermeshing Rotor Autogiro second somewhat less complicated type intermeshing twin rotor Synchropter see Fig 2 concept successfully developed Adequate spac ing required Typical fuse section Flexible sections bearings Bevel gears Plain gears Fig 3 Rotor system using bevel gears four years develop such system before successful flights made another writing March 1979 issue magazine showed system 87 pieces rotor passive head trimmable ground Thanks development work done model Helicopter can save much effort nowadays simply adapting Helicopter head Autogiro using cyclic collec tive pitch control model fact Japanese model Helicopter manufacturers selling such Autogiro kit Kalt Robin Gyrocopter model type plane James Bond cavorted around 74 Model Aviation / 7Fig 5 Twin side-by-side rotor configuration Fig 4 Rotor system using flexible shafts culty Ref 1 shows details successful French design Fig 3 shows models rotor arrangement gears located actual metalwork probably within capability modelers largest problem see Find suitable set angled gears anyone interested type would suggest first task would obtain gears design rest system around angled gears available another approach shown Fig 4 small length flexible cable introduced rotor shafts enables straight gears used type Autogiro -Continued page 137 Wheels really necessary model easily hand-launched comes down almost vertically engine cuts out typical four-bladed rotor Ply 1/16 plates both sides blades provide support rotor bearing No blade airfoil needed Left rotor 900 right outside surface frame can also inset give smooth outer surface An alternate method has thin plywood styrene plastic frame cutouts windows clear plastic windows glued inner surface opening approaches scale appearance Another suggestion framing use plastic adhesive tape such stretchy waterproof type comes widths colors odd shape width needed length tape can stuck down hard surface styrene example exact shape cut sharppointed blade Simply lift off surface transfer piece model can shifted around get exact fit best paint tape after applied model Like Epoxolite mentioned earlier tape has adIve no experience Ive built single rotor type both Free Flight RC no success RC version side-by-side rotor types can see photos lack experience doesnt prevent making couple comments first system must lead reduced efficiency lift produced must inversely propor tional cant angle rotor greater cant less efficient system must other point concerns lateral stability outward cantof rotors represents awing large anhedral can turns made flight Maybe reader could shed some light latter point Twin Side-by-Side Rotor Autogiro last type Ill discuss twin side-by-side rotor system illustrated Fig 5 Several plans have published Autogiros config uration easiest type insofar construction concerned requires same level building skill simple fixed-wing conventional RC model Having two counter-rotating rotors means lateral balance achieved Canting rotors inward provides dihedral effect similar normal wing rotors themselves can built flat makes easy construction can made simple cruciform THEANTIC BIPEBY DodOi REAL SHOW STOPPER & CROWD PLEASER STATTTESSATOTLCBACBOUSTLOAFTSC TAKE ACCA B LANE TEES SUB ESThEBELA EAST SOC CAN ECTIT LEASBAS BASEST BA FIT ASTS TEB Err SCALE COBSSSTJCTTOB SUBOLAT CUTSTT AlAS BASAlTS SAT FLAT SEBTACE ALL CATTY ASAUTUCELCA FITAIBAB ETC STE BEBASSSEAATBT TST ESSESESEETS Ar SCALE CASSTTUCAIAA SWAT TLAATS ATE AAATLABLE FAT SEACTABC ACTTAFTSBLABLC STAB TEST SQ TB ATBA ATTATT TN SCABAETASSA ITS ES AILL BESET TB EBBLE FOWETTCSAB TAATCWIBAS BE ETBOCABUC IBTrBBTEITBAATAFPBEATBASTE BISATAC LOBEE EBB BITE EBSCSEBE ABEB BI AA AC CTACTAA CBT COBI CO BAA STAT SAN ATEGA CALIF TETAL SEIBS BETEBE BET CATS TEST C ASEAT CT SEE STEEL CE STIlT November 1981 137 SAILPLANES R/C COMPETITION & SPORT SCALE R/C JEMCO SPORT SCALE BALSA COVERED POAM WING CORES vantage can form compound curves fillets Autogiros H eadley Continued page 74 CUSTOM TUNED ENGINES COMPETITION 4CCESSORIES Specialists custom TD 049/051 reed engines Throttled TD s available Complete inventory individual stock Custom parts Cox TD 020 049 061 & 09 engines Exclusive distributor Nelson 15 engine parts Hard-to-get Items such Custom needle valves racing wheels quick fills fuel shut-a ffs solid control lines others detailed brochure send 25 cents Kustom Kraftsmanship Box 2699 Laguna Hills CA 92653 Ph 714 830-5162 QUICK N EASY CUT-OUT PATTERN-PLANS Can Cut & Assembled Evening Stand-Up Flight Box $695 No Measur ng Needed TO BUILD Trace Assemble DESIGNED TO HOLD Fuel tank Trans ter Battery Fuse Hold adi Tools etc Legs Removable 21 s 12 x 39 Send SELECT PRODUCTS PO Box 259 Palo Cedro CA 96073 large Helicopter head [he Kalt model has flexible drive wheels rotor speed up distinctive sound air. Technopowers 7 cylinder 4 cycle Radial Engine Send $200 catalog products TECHNOPOWERH INC 16650 South 104th AVENUE ORLAND PARK ILLINOIS 60462 Winning Ideas FOURMOST FUEL MANIFOLD 141FUEL SHUT OFFSmall Fuel Fitting Set Manifold Provides ConvenientCan Used Control FuelSize 4 10 PRICE $150 Method Tank Filling Draining andFlow Starting1 Tee 2 Elbows 1 Pen B adde Tee Priming Positive Airborn Shutoff % 0PRICE $125PRICE $4 20 %ANDiODSTRUT FAIRINGS Comes twoII 23 LengthsCl] cock itfl -Two Sizes coffiwig% k 10Large Fue F tt ng Set Packaged Ft SizePRICE 17Size % IDPRCE $200 21 Tee 1 Elbow 1 Union 1 Plug PRICE $2 2 lengths eitlgbr size $270Both Made Fuei Proof Polyethyleoe Send SASE Complete Information FOUR MOST 4040 24th Ave Forest Grove OR 97116 PRODUCTS Phone 503 357-2732 shape automatically sets blade pitchdiameter assuming two blades will anglearound 50 layout modem Heli copter should work Some sort help needed During single-channel phasesto spin up rotor fortakeoff avoid enormous built several modelsfrom simple sheettakeoff distances rotor friction seems profile fuselages Scale Helicopter designs rudder control can see photos sort configuration possible single-channel model current effort two-channel rudder elevator Cox 05 1-powered model based contemporary ultra-light aircraft Weedhopper Fig 6 shows design Ive called Grasshopper should flying soon Designing Own Autogiro Single Rotor Type heavyweight model full con trolability least four channels needed puts engine 35-40 size Rotor Twin Intermesahing Rotor Type Theres very little data type model configura tion Ref 1 uses similar engine size rotor diameter data given above About drawback layout type model has very tall canted-down rotors dont hit ground Twin Side-by-Side Rotor Autogiro As easiest type put air theres quite bit data around help scratch-builder looking through collection model mags Ive able obtain lot dimensional information Ive summarized table use data first requires estimate number channels used turn fixes engine size example 049 engine will probably handle rudder engine elevator rudder control engine around 20 30 will needed Fig 7 shows typical twin rotor layout pertinent dimensions called Out letters Use coriunction table Fig 8 shows rotor c1ianleter function engine size next t ep after choosing engine find rotor i iameter table allows tail area B tail arm C obtained wing dihedral rotor axis tilt angles D E both 50100 region about information needed make initial layout drawing CG center gravity location near intersection rotor axis thrust line some designers say little front some little behind best location will found flight testing couple construction hints rotor pitch angles can set either using twisted aluminum hub using technique Ref 3 shown Fig 9 blade overlaps other give rotor pitch angle around two three degrees rotors could mounted old Cox engine crankcases crankshafts 020 small models 049 larger types simple wire axles Final Word Ive time space very brief survey RC Autogiro fully detailed study would probably have taken up whole magazine hope may have aroused interest type model may encourage try hand building something As said beginning theres something everyone youd like information want pass own data write Ill pleased hear Jack Headley 5640 Scotwood Dr. Rancho Palos Verdes CA 90274 References Synchrogyro Model Builder Sept 1979 2 P./CAutogyroRCMandE April1975 3 Twin Gyro 4eromodeller March 1975 Fig 6 Grasshopper 138 Model Aviation
Edition: Model Aviation - 1981/11
Page Numbers: 72, 73, 74, 137, 138
NO OCR TEXT ONE OF THE neglected types Radio Control models Autogiro possibly because falls somewhere between Helicopter conventional fixed-wing model per formance yet its interesting challenge provides exciting days flying will fly wont fact some Autogiro projects dont dare visit regular flying field until Ive made few secret fligits elsewhere idea article look current state RC Autogiro hope stimulate interest type model well see few rotating wings flying field will seen article progresses challenges types builders herefrom modeler full machine shop type interest cut balsa razor blade myself example Well look three basic types Autogiro simple single rotor whih turns out the-most complex invented Cierva twin intermeshing type developed full-scale Flettner Focke-Achgelis Fa 61 type twin side-by-side rotors Single Rotor Autogiro single rotor Free Flight Autogiro has around quite some time can made fly well RC version has however easy develop go along same learning curve Cierva developing full-scale Autogiro Fig 1 shows idealized single rotor model rotor spinning counterclockwise model flies forward rotor lift becomes unbalanced model will roll left fact certain rotor revs flight speeds left side rotor can product no lift Free Flight models essentially fly speed turn direction rolling moment can trimmed out flexible rotor hub shaft RC model flies various speeds turns direction trimming problem easy Some designers have overcome adding large conven tional wing aileron control really cheating think correct approach mechanize rotor blades rotor forces controlled flier objective easy say too easy accomplish task model Autogiro builder duplicate miniature system Cierva developed flapping blades drag hinges tilting rotor head Thats formid able project investigator reports took Table Suggested Values Twin Rotor Autogiro UnitItemSuggested Value ARotor diameterDepends engine size See graph BTail area square inches34 4 times rotor diameter CTail arm inches075 10 times rotor diameter oRotor support angle wing dihedral5 lOdeg ERotor sweep-back angle5 10 deg FCenter gravity locationOn rotor axis final location found flight tests GRotor blade pitch angle2 deg 3 deg November1981 73 nutru S uau LCI Oa,tata uw urn i a. channel rudder-only autogiro author examines early designs before mixing upthe smog overSepulveda Basin cziz Fig 1 Single rotor configuration Fig 2 Twin intermeshing rotors Control Robin rudder throttle two blade pitch controls modeler task producing success ful single rotor Autogiro now much reduced really consists using pieces readily-available model Helicopter world imagine items crashed Helicopters hope arent too numerous could cheaply obtained easily adapted model Autogiro however interests lay doing little machining work modeling activities next type will probably appeal Germany during 1930s Helicopter Anton Flettner has used US Kellett Kaman adapt system model Autogiro two blades must geared together somehow dont run other rotor shafts canted outward blades can actually rotate general system resembles eggbeater sometimes called name However problems great diffi Intermeshing Rotor Autogiro second somewhat less complicated type intermeshing twin rotor Synchropter see Fig 2 concept successfully developed Adequate spac ing required Typical fuse section Flexible sections bearings Bevel gears Plain gears Fig 3 Rotor system using bevel gears four years develop such system before successful flights made another writing March 1979 issue magazine showed system 87 pieces rotor passive head trimmable ground Thanks development work done model Helicopter can save much effort nowadays simply adapting Helicopter head Autogiro using cyclic collec tive pitch control model fact Japanese model Helicopter manufacturers selling such Autogiro kit Kalt Robin Gyrocopter model type plane James Bond cavorted around 74 Model Aviation / 7Fig 5 Twin side-by-side rotor configuration Fig 4 Rotor system using flexible shafts culty Ref 1 shows details successful French design Fig 3 shows models rotor arrangement gears located actual metalwork probably within capability modelers largest problem see Find suitable set angled gears anyone interested type would suggest first task would obtain gears design rest system around angled gears available another approach shown Fig 4 small length flexible cable introduced rotor shafts enables straight gears used type Autogiro -Continued page 137 Wheels really necessary model easily hand-launched comes down almost vertically engine cuts out typical four-bladed rotor Ply 1/16 plates both sides blades provide support rotor bearing No blade airfoil needed Left rotor 900 right outside surface frame can also inset give smooth outer surface An alternate method has thin plywood styrene plastic frame cutouts windows clear plastic windows glued inner surface opening approaches scale appearance Another suggestion framing use plastic adhesive tape such stretchy waterproof type comes widths colors odd shape width needed length tape can stuck down hard surface styrene example exact shape cut sharppointed blade Simply lift off surface transfer piece model can shifted around get exact fit best paint tape after applied model Like Epoxolite mentioned earlier tape has adIve no experience Ive built single rotor type both Free Flight RC no success RC version side-by-side rotor types can see photos lack experience doesnt prevent making couple comments first system must lead reduced efficiency lift produced must inversely propor tional cant angle rotor greater cant less efficient system must other point concerns lateral stability outward cantof rotors represents awing large anhedral can turns made flight Maybe reader could shed some light latter point Twin Side-by-Side Rotor Autogiro last type Ill discuss twin side-by-side rotor system illustrated Fig 5 Several plans have published Autogiros config uration easiest type insofar construction concerned requires same level building skill simple fixed-wing conventional RC model Having two counter-rotating rotors means lateral balance achieved Canting rotors inward provides dihedral effect similar normal wing rotors themselves can built flat makes easy construction can made simple cruciform THEANTIC BIPEBY DodOi REAL SHOW STOPPER & CROWD PLEASER STATTTESSATOTLCBACBOUSTLOAFTSC TAKE ACCA B LANE TEES SUB ESThEBELA EAST SOC CAN ECTIT LEASBAS BASEST BA FIT ASTS TEB Err SCALE COBSSSTJCTTOB SUBOLAT CUTSTT AlAS BASAlTS SAT FLAT SEBTACE ALL CATTY ASAUTUCELCA FITAIBAB ETC STE BEBASSSEAATBT TST ESSESESEETS Ar SCALE CASSTTUCAIAA SWAT TLAATS ATE AAATLABLE FAT SEACTABC ACTTAFTSBLABLC STAB TEST SQ TB ATBA ATTATT TN SCABAETASSA ITS ES AILL BESET TB EBBLE FOWETTCSAB TAATCWIBAS BE ETBOCABUC IBTrBBTEITBAATAFPBEATBASTE BISATAC LOBEE EBB BITE EBSCSEBE ABEB BI AA AC CTACTAA CBT COBI CO BAA STAT SAN ATEGA CALIF TETAL SEIBS BETEBE BET CATS TEST C ASEAT CT SEE STEEL CE STIlT November 1981 137 SAILPLANES R/C COMPETITION & SPORT SCALE R/C JEMCO SPORT SCALE BALSA COVERED POAM WING CORES vantage can form compound curves fillets Autogiros H eadley Continued page 74 CUSTOM TUNED ENGINES COMPETITION 4CCESSORIES Specialists custom TD 049/051 reed engines Throttled TD s available Complete inventory individual stock Custom parts Cox TD 020 049 061 & 09 engines Exclusive distributor Nelson 15 engine parts Hard-to-get Items such Custom needle valves racing wheels quick fills fuel shut-a ffs solid control lines others detailed brochure send 25 cents Kustom Kraftsmanship Box 2699 Laguna Hills CA 92653 Ph 714 830-5162 QUICK N EASY CUT-OUT PATTERN-PLANS Can Cut & Assembled Evening Stand-Up Flight Box $695 No Measur ng Needed TO BUILD Trace Assemble DESIGNED TO HOLD Fuel tank Trans ter Battery Fuse Hold adi Tools etc Legs Removable 21 s 12 x 39 Send SELECT PRODUCTS PO Box 259 Palo Cedro CA 96073 large Helicopter head [he Kalt model has flexible drive wheels rotor speed up distinctive sound air. Technopowers 7 cylinder 4 cycle Radial Engine Send $200 catalog products TECHNOPOWERH INC 16650 South 104th AVENUE ORLAND PARK ILLINOIS 60462 Winning Ideas FOURMOST FUEL MANIFOLD 141FUEL SHUT OFFSmall Fuel Fitting Set Manifold Provides ConvenientCan Used Control FuelSize 4 10 PRICE $150 Method Tank Filling Draining andFlow Starting1 Tee 2 Elbows 1 Pen B adde Tee Priming Positive Airborn Shutoff % 0PRICE $125PRICE $4 20 %ANDiODSTRUT FAIRINGS Comes twoII 23 LengthsCl] cock itfl -Two Sizes coffiwig% k 10Large Fue F tt ng Set Packaged Ft SizePRICE 17Size % IDPRCE $200 21 Tee 1 Elbow 1 Union 1 Plug PRICE $2 2 lengths eitlgbr size $270Both Made Fuei Proof Polyethyleoe Send SASE Complete Information FOUR MOST 4040 24th Ave Forest Grove OR 97116 PRODUCTS Phone 503 357-2732 shape automatically sets blade pitchdiameter assuming two blades will anglearound 50 layout modem Heli copter should work Some sort help needed During single-channel phasesto spin up rotor fortakeoff avoid enormous built several modelsfrom simple sheettakeoff distances rotor friction seems profile fuselages Scale Helicopter designs rudder control can see photos sort configuration possible single-channel model current effort two-channel rudder elevator Cox 05 1-powered model based contemporary ultra-light aircraft Weedhopper Fig 6 shows design Ive called Grasshopper should flying soon Designing Own Autogiro Single Rotor Type heavyweight model full con trolability least four channels needed puts engine 35-40 size Rotor Twin Intermesahing Rotor Type Theres very little data type model configura tion Ref 1 uses similar engine size rotor diameter data given above About drawback layout type model has very tall canted-down rotors dont hit ground Twin Side-by-Side Rotor Autogiro As easiest type put air theres quite bit data around help scratch-builder looking through collection model mags Ive able obtain lot dimensional information Ive summarized table use data first requires estimate number channels used turn fixes engine size example 049 engine will probably handle rudder engine elevator rudder control engine around 20 30 will needed Fig 7 shows typical twin rotor layout pertinent dimensions called Out letters Use coriunction table Fig 8 shows rotor c1ianleter function engine size next t ep after choosing engine find rotor i iameter table allows tail area B tail arm C obtained wing dihedral rotor axis tilt angles D E both 50100 region about information needed make initial layout drawing CG center gravity location near intersection rotor axis thrust line some designers say little front some little behind best location will found flight testing couple construction hints rotor pitch angles can set either using twisted aluminum hub using technique Ref 3 shown Fig 9 blade overlaps other give rotor pitch angle around two three degrees rotors could mounted old Cox engine crankcases crankshafts 020 small models 049 larger types simple wire axles Final Word Ive time space very brief survey RC Autogiro fully detailed study would probably have taken up whole magazine hope may have aroused interest type model may encourage try hand building something As said beginning theres something everyone youd like information want pass own data write Ill pleased hear Jack Headley 5640 Scotwood Dr. Rancho Palos Verdes CA 90274 References Synchrogyro Model Builder Sept 1979 2 P./CAutogyroRCMandE April1975 3 Twin Gyro 4eromodeller March 1975 Fig 6 Grasshopper 138 Model Aviation
Edition: Model Aviation - 1981/11
Page Numbers: 72, 73, 74, 137, 138
NO OCR TEXT ONE OF THE neglected types Radio Control models Autogiro possibly because falls somewhere between Helicopter conventional fixed-wing model per formance yet its interesting challenge provides exciting days flying will fly wont fact some Autogiro projects dont dare visit regular flying field until Ive made few secret fligits elsewhere idea article look current state RC Autogiro hope stimulate interest type model well see few rotating wings flying field will seen article progresses challenges types builders herefrom modeler full machine shop type interest cut balsa razor blade myself example Well look three basic types Autogiro simple single rotor whih turns out the-most complex invented Cierva twin intermeshing type developed full-scale Flettner Focke-Achgelis Fa 61 type twin side-by-side rotors Single Rotor Autogiro single rotor Free Flight Autogiro has around quite some time can made fly well RC version has however easy develop go along same learning curve Cierva developing full-scale Autogiro Fig 1 shows idealized single rotor model rotor spinning counterclockwise model flies forward rotor lift becomes unbalanced model will roll left fact certain rotor revs flight speeds left side rotor can product no lift Free Flight models essentially fly speed turn direction rolling moment can trimmed out flexible rotor hub shaft RC model flies various speeds turns direction trimming problem easy Some designers have overcome adding large conven tional wing aileron control really cheating think correct approach mechanize rotor blades rotor forces controlled flier objective easy say too easy accomplish task model Autogiro builder duplicate miniature system Cierva developed flapping blades drag hinges tilting rotor head Thats formid able project investigator reports took Table Suggested Values Twin Rotor Autogiro UnitItemSuggested Value ARotor diameterDepends engine size See graph BTail area square inches34 4 times rotor diameter CTail arm inches075 10 times rotor diameter oRotor support angle wing dihedral5 lOdeg ERotor sweep-back angle5 10 deg FCenter gravity locationOn rotor axis final location found flight tests GRotor blade pitch angle2 deg 3 deg November1981 73 nutru S uau LCI Oa,tata uw urn i a. channel rudder-only autogiro author examines early designs before mixing upthe smog overSepulveda Basin cziz Fig 1 Single rotor configuration Fig 2 Twin intermeshing rotors Control Robin rudder throttle two blade pitch controls modeler task producing success ful single rotor Autogiro now much reduced really consists using pieces readily-available model Helicopter world imagine items crashed Helicopters hope arent too numerous could cheaply obtained easily adapted model Autogiro however interests lay doing little machining work modeling activities next type will probably appeal Germany during 1930s Helicopter Anton Flettner has used US Kellett Kaman adapt system model Autogiro two blades must geared together somehow dont run other rotor shafts canted outward blades can actually rotate general system resembles eggbeater sometimes called name However problems great diffi Intermeshing Rotor Autogiro second somewhat less complicated type intermeshing twin rotor Synchropter see Fig 2 concept successfully developed Adequate spac ing required Typical fuse section Flexible sections bearings Bevel gears Plain gears Fig 3 Rotor system using bevel gears four years develop such system before successful flights made another writing March 1979 issue magazine showed system 87 pieces rotor passive head trimmable ground Thanks development work done model Helicopter can save much effort nowadays simply adapting Helicopter head Autogiro using cyclic collec tive pitch control model fact Japanese model Helicopter manufacturers selling such Autogiro kit Kalt Robin Gyrocopter model type plane James Bond cavorted around 74 Model Aviation / 7Fig 5 Twin side-by-side rotor configuration Fig 4 Rotor system using flexible shafts culty Ref 1 shows details successful French design Fig 3 shows models rotor arrangement gears located actual metalwork probably within capability modelers largest problem see Find suitable set angled gears anyone interested type would suggest first task would obtain gears design rest system around angled gears available another approach shown Fig 4 small length flexible cable introduced rotor shafts enables straight gears used type Autogiro -Continued page 137 Wheels really necessary model easily hand-launched comes down almost vertically engine cuts out typical four-bladed rotor Ply 1/16 plates both sides blades provide support rotor bearing No blade airfoil needed Left rotor 900 right outside surface frame can also inset give smooth outer surface An alternate method has thin plywood styrene plastic frame cutouts windows clear plastic windows glued inner surface opening approaches scale appearance Another suggestion framing use plastic adhesive tape such stretchy waterproof type comes widths colors odd shape width needed length tape can stuck down hard surface styrene example exact shape cut sharppointed blade Simply lift off surface transfer piece model can shifted around get exact fit best paint tape after applied model Like Epoxolite mentioned earlier tape has adIve no experience Ive built single rotor type both Free Flight RC no success RC version side-by-side rotor types can see photos lack experience doesnt prevent making couple comments first system must lead reduced efficiency lift produced must inversely propor tional cant angle rotor greater cant less efficient system must other point concerns lateral stability outward cantof rotors represents awing large anhedral can turns made flight Maybe reader could shed some light latter point Twin Side-by-Side Rotor Autogiro last type Ill discuss twin side-by-side rotor system illustrated Fig 5 Several plans have published Autogiros config uration easiest type insofar construction concerned requires same level building skill simple fixed-wing conventional RC model Having two counter-rotating rotors means lateral balance achieved Canting rotors inward provides dihedral effect similar normal wing rotors themselves can built flat makes easy construction can made simple cruciform THEANTIC BIPEBY DodOi REAL SHOW STOPPER & CROWD PLEASER STATTTESSATOTLCBACBOUSTLOAFTSC TAKE ACCA B LANE TEES SUB ESThEBELA EAST SOC CAN ECTIT LEASBAS BASEST BA FIT ASTS TEB Err SCALE COBSSSTJCTTOB SUBOLAT CUTSTT AlAS BASAlTS SAT FLAT SEBTACE ALL CATTY ASAUTUCELCA FITAIBAB ETC STE BEBASSSEAATBT TST ESSESESEETS Ar SCALE CASSTTUCAIAA SWAT TLAATS ATE AAATLABLE FAT SEACTABC ACTTAFTSBLABLC STAB TEST SQ TB ATBA ATTATT TN SCABAETASSA ITS ES AILL BESET TB EBBLE FOWETTCSAB TAATCWIBAS BE ETBOCABUC IBTrBBTEITBAATAFPBEATBASTE BISATAC LOBEE EBB BITE EBSCSEBE ABEB BI AA AC CTACTAA CBT COBI CO BAA STAT SAN ATEGA CALIF TETAL SEIBS BETEBE BET CATS TEST C ASEAT CT SEE STEEL CE STIlT November 1981 137 SAILPLANES R/C COMPETITION & SPORT SCALE R/C JEMCO SPORT SCALE BALSA COVERED POAM WING CORES vantage can form compound curves fillets Autogiros H eadley Continued page 74 CUSTOM TUNED ENGINES COMPETITION 4CCESSORIES Specialists custom TD 049/051 reed engines Throttled TD s available Complete inventory individual stock Custom parts Cox TD 020 049 061 & 09 engines Exclusive distributor Nelson 15 engine parts Hard-to-get Items such Custom needle valves racing wheels quick fills fuel shut-a ffs solid control lines others detailed brochure send 25 cents Kustom Kraftsmanship Box 2699 Laguna Hills CA 92653 Ph 714 830-5162 QUICK N EASY CUT-OUT PATTERN-PLANS Can Cut & Assembled Evening Stand-Up Flight Box $695 No Measur ng Needed TO BUILD Trace Assemble DESIGNED TO HOLD Fuel tank Trans ter Battery Fuse Hold adi Tools etc Legs Removable 21 s 12 x 39 Send SELECT PRODUCTS PO Box 259 Palo Cedro CA 96073 large Helicopter head [he Kalt model has flexible drive wheels rotor speed up distinctive sound air. Technopowers 7 cylinder 4 cycle Radial Engine Send $200 catalog products TECHNOPOWERH INC 16650 South 104th AVENUE ORLAND PARK ILLINOIS 60462 Winning Ideas FOURMOST FUEL MANIFOLD 141FUEL SHUT OFFSmall Fuel Fitting Set Manifold Provides ConvenientCan Used Control FuelSize 4 10 PRICE $150 Method Tank Filling Draining andFlow Starting1 Tee 2 Elbows 1 Pen B adde Tee Priming Positive Airborn Shutoff % 0PRICE $125PRICE $4 20 %ANDiODSTRUT FAIRINGS Comes twoII 23 LengthsCl] cock itfl -Two Sizes coffiwig% k 10Large Fue F tt ng Set Packaged Ft SizePRICE 17Size % IDPRCE $200 21 Tee 1 Elbow 1 Union 1 Plug PRICE $2 2 lengths eitlgbr size $270Both Made Fuei Proof Polyethyleoe Send SASE Complete Information FOUR MOST 4040 24th Ave Forest Grove OR 97116 PRODUCTS Phone 503 357-2732 shape automatically sets blade pitchdiameter assuming two blades will anglearound 50 layout modem Heli copter should work Some sort help needed During single-channel phasesto spin up rotor fortakeoff avoid enormous built several modelsfrom simple sheettakeoff distances rotor friction seems profile fuselages Scale Helicopter designs rudder control can see photos sort configuration possible single-channel model current effort two-channel rudder elevator Cox 05 1-powered model based contemporary ultra-light aircraft Weedhopper Fig 6 shows design Ive called Grasshopper should flying soon Designing Own Autogiro Single Rotor Type heavyweight model full con trolability least four channels needed puts engine 35-40 size Rotor Twin Intermesahing Rotor Type Theres very little data type model configura tion Ref 1 uses similar engine size rotor diameter data given above About drawback layout type model has very tall canted-down rotors dont hit ground Twin Side-by-Side Rotor Autogiro As easiest type put air theres quite bit data around help scratch-builder looking through collection model mags Ive able obtain lot dimensional information Ive summarized table use data first requires estimate number channels used turn fixes engine size example 049 engine will probably handle rudder engine elevator rudder control engine around 20 30 will needed Fig 7 shows typical twin rotor layout pertinent dimensions called Out letters Use coriunction table Fig 8 shows rotor c1ianleter function engine size next t ep after choosing engine find rotor i iameter table allows tail area B tail arm C obtained wing dihedral rotor axis tilt angles D E both 50100 region about information needed make initial layout drawing CG center gravity location near intersection rotor axis thrust line some designers say little front some little behind best location will found flight testing couple construction hints rotor pitch angles can set either using twisted aluminum hub using technique Ref 3 shown Fig 9 blade overlaps other give rotor pitch angle around two three degrees rotors could mounted old Cox engine crankcases crankshafts 020 small models 049 larger types simple wire axles Final Word Ive time space very brief survey RC Autogiro fully detailed study would probably have taken up whole magazine hope may have aroused interest type model may encourage try hand building something As said beginning theres something everyone youd like information want pass own data write Ill pleased hear Jack Headley 5640 Scotwood Dr. Rancho Palos Verdes CA 90274 References Synchrogyro Model Builder Sept 1979 2 P./CAutogyroRCMandE April1975 3 Twin Gyro 4eromodeller March 1975 Fig 6 Grasshopper 138 Model Aviation