Radio Technique George M Myers LOT has happened around personal life past month Lee Anne Corey informed new grand child production Geoffrey visited few days job usually keeps him Inter-mountain West Chris nounced engagement Terry mother-in-law Anne lived died two blizzards fell Long Island Ive helped develop Sky Day local college helped friend put together article plane should appear magazine soon gave talks couple local clubs put off Income Tax last min ute should come no surprise say havent finished Helicopter Baron 20 powered OS Wankel talked about last month cant tell flies inverted 4 w D Y ThRUST W WEIGHT j LIFT Dx DRAG diving upright inverted because talking about constant airspeed drag function airspeed lift coefficient lift coefficient Cl wing same zero going up down drag forces must equal Youll have take word unless want break open some aerodynamics texts drag forces also will increase significantly level flight leaves us two equa tions well derive third 1 T-max W ing Up 2 T-min going Down 3 By substitution have T-max T-min 2W Now know hard get thrust-to-weight ratio 2 real airplane situation next best thing make T-min negative possible 7D Free-body force-equiIIbrlum diagrams airplane cardinal points constant-speed inside Square Loop Lets look something else Ive overheard some people talking about possible need transmitter new Turnaround pattern Since Ive al ready done some thinking about perhaps youd like take look some ideas Lets talk about Turnaround Radio first consideration airplane trend FAI toward plane flies slower weve see ing past few years first fig ure shows free-body equilibrium forces airplane flying through Inside Square Loop constant airspeed around loop assumedbecause some folks think Constant Speed looks Best Drag force will same climbing Two ways come mind Speed Brakes Reverse Pitch may need both because question answered can climb fast can dive Ive seen airplane dive constant speed reversible turboprop modification Great Lakes 2-T biplane dropped about 5000 feet 70 degree angle flared landed backed up EAA Fly-In Oshkosh WI back 1976 have movies it still looks strange thats what want. Lets say can get reversible pitch propeller will develop 50% its forward thrust reverse dive Re verse thrust bound less 100% forward thrust because ~33W L 0 Tk41i /33W 4 r TD43W Determination thrust required cardlnai points inside Square Loop constant velocity assumed 60 mph Other assumptIons T-max 133W T-min ax Whole-body dreg estimation beat giide angle expianation coiumn resuits teata would used chart Below find aerodynamic characteristics piane lift-to-drag ratio LID drag coefticlent Cd 0pPAT4 ceoew4c G ARCTAIV* L S e D~W3/N 6 44 Model Aviation DS3W L0 Th b- W %7W propeller twisted wrong di rection reverse flow used constant-pitch propeller like model Helicopter main rotor airflow around propeller would wrong because would approach front go past prop after work ing past wing nose fuselage enter rear sume really can develop 50% re verse thrust after equation 3 becomes 4 T-max -5 T-max which simplifies T-max looks like reasonable situation reasonable What speed does imply Substituting Equation 1 sim plifying yields 6 D need some kind drag estimate whole airplane way get would some engine-off glide tests varying glide speed get best possible range Measure distance traveled versus distance dropped time glide could expect see 61 glide ratio Cessna 172-type airplane glide ratios up about 15 1 clean retract-gear Pattern plane Glide speed should mea sure out 20 40 mph depending design Whatever measure distance-ratio can taken Lift/Drag ratio airplane speed example lets say measure approximate glide ratio 121 ataglidespeedof30mph same Lift/Drag ratio will apply level flight same speed Re membering Lift ht level flight lets saythat airplane weighs eight pounds whole-body drag force flying level 30 mph will 1/12th eight pounds 67 pounds Diving 30 mph wing angle zero lift would about same Since estimated diving Drag Force 33W 8 pounds equation 6 telling us need drag parachute well reverse thrust order dive 30 mph Either should decide dive fast enough develop 267 pounds drag Lets dive faster can esti mate speed needed equation drag points force D Cd dimen following table lists times seconds versus speed mph several glides assuming stopwatch started just plane passes eye level taken 5 feet high stopped hits ground some distance away Equivalent Lift/Drag ratios wholebody Coefficients Drag Cd calculated neglecting ground effect assuming pilot does flare landing Distance 2500 3003 3500 4000 5000 6000 7000 8000 10000 LID 500 600 700 800 1000 1200 1400 1600 2000 Cd 020 016 014 012 010 008 007 006 005 20 mph 085 102 119 136 1 70 205 239 273 341 Time seconds 30 mph 057 068 080 091 114 136 1 59 182 227 40 mph 043 051 060 068 085 102 119 136 1 70 sionless number S characteristic area square feet five square feet about average wing area model type q mic air pressure pounds per square foot 89 x Velocity squared Stan dard Day sea level V ex pressed feet per second cares just want Drag Force 267/67 mes larger can get simply multiplying pre vious velocity square root 4 30 mph x 2 h Can fly speed Modern Pattern planes fly faster drawing possible horsepower 60 engine want fly 60 mph level need use less power real trick pick combination Continued page 143 July 1984 45 Whats going Look prop Georges Curare Above very carefullyIts reverse pitch No hes trying fly backwardshe wants in-flight reverse thrust slow down dive speed Heres look innards Landert Reversible prop Below came box Read column find out hes tryIng thisand succeeded SHIPPING AND HANDLING 84 Page CATALOGUE Up $800 add $150$200 PP/Sat Class $801 $2000 add $225A copy will sent $2001 $4500 add $300 free-when requested$4501 $7000 add $350 order over $7000 add $400HOBBY HORN CA Addressees add 6% taxachobby specialtiescO Send MO Visa/MC#Exp15173 Moran Street Al Check allow op 30po Boa 2212 days check clearanceWestminster Ca 02883 CODExact Charges 714 8938311 Hdl Cash Only[AIl UPSI714 0051203 INTRODUCING THE NEW FOX 29 BB Bore732 Stroke715 Displacement299 RPM 96 prop.. 14000 Weight9 Ox Fuel ConsumptIon 5 ox mm Fox Schneurie 29 brand new replacement popular Baffle 29 todays modern technology latest model Fox 29 produces half again power older 29 does little no nitro new 29 interchangeable earlier model Fox 29s Isnt time trust model powerful new Fox engine 23000 Fox 29BBRC Schneurie$5995 13000 Fox 29BBCL Schneurie4495 90236 TiItup Muffler1495 90237 TlitDown Muffler1495 F OXMFG Co 5305 TOWSO14 AVEFORT SMITH ARK 72901 MasterCard Visa Accepted tions about LeCrate equipment used youll get quick answers After did Dont make head-to-head Com parisons glow engines Electrics LeCrate am living pleasant double life Radio Technique/Myers Continued aie airplane engine reversible-pitch propeller such T-max 13W T-min Beyond need two-position propeller-pitch control transmitterand would also nice have additional detent throttle mark throttle setting level flight chosen design speed 60 mph example test purposes tried RC-Ver stell-Propeller J Landert CH-8625 Gossau TeL 01 9352681 bought somebody Toledo Show 1981 according date marked box may still avail able know seems im ported Germany 11 inches diameter changes pitch 1- 15 de greeS importer still business let know Ill pass Weve finally come Turnaround transmitter Fitted Curare controlled Landing Gear switch act like two-position propeller Landert propeller gave chance test theoretical Turnaround trans mitter Let comment kept pretty busy learning fly propeller airplane same time order avoid changing propeller pitch full throttle tried school myself Throttle Down flip propeller re versing switch Throttle Up reverse pitch dive Throttle Down again initiate pullout Throt tling Up detent filed throttle-stick ratchet level flight lot main thing learned need lighter Curare Other worked thing sure made very careful landings sure dont want damage prop anyone now thinking seriously about building Turnaround transmit ter suggestion implement Propeller Pitch Control two-posi tion affair End Point Control simplest way can think to use Buddy-Box-type pushbutton Channel 5 Ace Silver Seven trans mitter setup insures pitch wont changed accidently some fooling transmitter new RC systems have End-Point Adjustment EPA Auxiliary controls could used same way George Myers 70 Froeblich Farm Rd Hicksville NY 11801 SAILPLANE LAUNCH EQUIPMENT FOR EVERY FIELD SPORTWINCH $225 0 * $300 Q9 * z inc1isd $350Q9 * $250 QP * * ptus shIpplg source QUIET FLIGHT supplies hi-starts electric motors& reducers batter ies pa rachutes tow line drums accessories braided nylon line selected kitsthe PROPHET sailplane kit moreVISA MASTERCARD DAVEY CORPORATION SYSTEMS ONE WOOD IANEMAIVERNPA19355 215644-0692 6772 Write call information aiy mat inc1ed July 1984 143 H0rn Wing Span-796 Wing Area--564 Sq JVEfW / 0~ SENSOAR glider HOBBY HORN Eaclasive HOBBY HORN Kit SENSOAR Glider kit high quality kit Machine cat 8 sanded parts Select quality balsa end spruce Detailed plans written instructions Far THERMAL SLOPE ar 05 ELECTRIC POWER VALUE PRICED 51600 IrThR KflS Pull au3 Partial Kits P & Semt-Kto Combined full stripwood plan Now intl Wire Window etc Mat fNole rhese may purchased lust semi kilo will planswrite call tsr prices 1936 Succaneer-f4-SI1 1938 Clipper MIt I-72--$30 1937 DaIlaire Sptaer109061 1941 Ranger48 027 1939 Mercury72$16 1035 MIss America94$19 1941 Playboy Jr -14020 1041 Playboy Sr00$46 1938 Pacer House94R43 1040 Sailplane70- $74 1940 So Long50$18 1039 Trenton Terror-77-S32 1930 Zlpper04049 1030 Korda Wakelleld44 037 MWWAY MODEL CO Semi-kits Combined w/strip 1936 PlyIng Quaker-04-040 3937 Quaker Flaah-6T$30 1937 Long Cabls79$42 1937 Air Chlaf61-841 STRUCKS 1540 74 Span 835 Sq SEMI-KIT Plan IncIl--033Oa flaw ruler Combo Full Kit $6300 ~ALPLANS DRAWINGS 510 HEINKEL HElOOD 62 63 sTOoo P OWR TOW P0W P Z 0DM RETRIEVER
Edition: Model Aviation - 1984/07
Page Numbers: 44, 45, 143
Radio Technique George M Myers LOT has happened around personal life past month Lee Anne Corey informed new grand child production Geoffrey visited few days job usually keeps him Inter-mountain West Chris nounced engagement Terry mother-in-law Anne lived died two blizzards fell Long Island Ive helped develop Sky Day local college helped friend put together article plane should appear magazine soon gave talks couple local clubs put off Income Tax last min ute should come no surprise say havent finished Helicopter Baron 20 powered OS Wankel talked about last month cant tell flies inverted 4 w D Y ThRUST W WEIGHT j LIFT Dx DRAG diving upright inverted because talking about constant airspeed drag function airspeed lift coefficient lift coefficient Cl wing same zero going up down drag forces must equal Youll have take word unless want break open some aerodynamics texts drag forces also will increase significantly level flight leaves us two equa tions well derive third 1 T-max W ing Up 2 T-min going Down 3 By substitution have T-max T-min 2W Now know hard get thrust-to-weight ratio 2 real airplane situation next best thing make T-min negative possible 7D Free-body force-equiIIbrlum diagrams airplane cardinal points constant-speed inside Square Loop Lets look something else Ive overheard some people talking about possible need transmitter new Turnaround pattern Since Ive al ready done some thinking about perhaps youd like take look some ideas Lets talk about Turnaround Radio first consideration airplane trend FAI toward plane flies slower weve see ing past few years first fig ure shows free-body equilibrium forces airplane flying through Inside Square Loop constant airspeed around loop assumedbecause some folks think Constant Speed looks Best Drag force will same climbing Two ways come mind Speed Brakes Reverse Pitch may need both because question answered can climb fast can dive Ive seen airplane dive constant speed reversible turboprop modification Great Lakes 2-T biplane dropped about 5000 feet 70 degree angle flared landed backed up EAA Fly-In Oshkosh WI back 1976 have movies it still looks strange thats what want. Lets say can get reversible pitch propeller will develop 50% its forward thrust reverse dive Re verse thrust bound less 100% forward thrust because ~33W L 0 Tk41i /33W 4 r TD43W Determination thrust required cardlnai points inside Square Loop constant velocity assumed 60 mph Other assumptIons T-max 133W T-min ax Whole-body dreg estimation beat giide angle expianation coiumn resuits teata would used chart Below find aerodynamic characteristics piane lift-to-drag ratio LID drag coefticlent Cd 0pPAT4 ceoew4c G ARCTAIV* L S e D~W3/N 6 44 Model Aviation DS3W L0 Th b- W %7W propeller twisted wrong di rection reverse flow used constant-pitch propeller like model Helicopter main rotor airflow around propeller would wrong because would approach front go past prop after work ing past wing nose fuselage enter rear sume really can develop 50% re verse thrust after equation 3 becomes 4 T-max -5 T-max which simplifies T-max looks like reasonable situation reasonable What speed does imply Substituting Equation 1 sim plifying yields 6 D need some kind drag estimate whole airplane way get would some engine-off glide tests varying glide speed get best possible range Measure distance traveled versus distance dropped time glide could expect see 61 glide ratio Cessna 172-type airplane glide ratios up about 15 1 clean retract-gear Pattern plane Glide speed should mea sure out 20 40 mph depending design Whatever measure distance-ratio can taken Lift/Drag ratio airplane speed example lets say measure approximate glide ratio 121 ataglidespeedof30mph same Lift/Drag ratio will apply level flight same speed Re membering Lift ht level flight lets saythat airplane weighs eight pounds whole-body drag force flying level 30 mph will 1/12th eight pounds 67 pounds Diving 30 mph wing angle zero lift would about same Since estimated diving Drag Force 33W 8 pounds equation 6 telling us need drag parachute well reverse thrust order dive 30 mph Either should decide dive fast enough develop 267 pounds drag Lets dive faster can esti mate speed needed equation drag points force D Cd dimen following table lists times seconds versus speed mph several glides assuming stopwatch started just plane passes eye level taken 5 feet high stopped hits ground some distance away Equivalent Lift/Drag ratios wholebody Coefficients Drag Cd calculated neglecting ground effect assuming pilot does flare landing Distance 2500 3003 3500 4000 5000 6000 7000 8000 10000 LID 500 600 700 800 1000 1200 1400 1600 2000 Cd 020 016 014 012 010 008 007 006 005 20 mph 085 102 119 136 1 70 205 239 273 341 Time seconds 30 mph 057 068 080 091 114 136 1 59 182 227 40 mph 043 051 060 068 085 102 119 136 1 70 sionless number S characteristic area square feet five square feet about average wing area model type q mic air pressure pounds per square foot 89 x Velocity squared Stan dard Day sea level V ex pressed feet per second cares just want Drag Force 267/67 mes larger can get simply multiplying pre vious velocity square root 4 30 mph x 2 h Can fly speed Modern Pattern planes fly faster drawing possible horsepower 60 engine want fly 60 mph level need use less power real trick pick combination Continued page 143 July 1984 45 Whats going Look prop Georges Curare Above very carefullyIts reverse pitch No hes trying fly backwardshe wants in-flight reverse thrust slow down dive speed Heres look innards Landert Reversible prop Below came box Read column find out hes tryIng thisand succeeded SHIPPING AND HANDLING 84 Page CATALOGUE Up $800 add $150$200 PP/Sat Class $801 $2000 add $225A copy will sent $2001 $4500 add $300 free-when requested$4501 $7000 add $350 order over $7000 add $400HOBBY HORN CA Addressees add 6% taxachobby specialtiescO Send MO Visa/MC#Exp15173 Moran Street Al Check allow op 30po Boa 2212 days check clearanceWestminster Ca 02883 CODExact Charges 714 8938311 Hdl Cash Only[AIl UPSI714 0051203 INTRODUCING THE NEW FOX 29 BB Bore732 Stroke715 Displacement299 RPM 96 prop.. 14000 Weight9 Ox Fuel ConsumptIon 5 ox mm Fox Schneurie 29 brand new replacement popular Baffle 29 todays modern technology latest model Fox 29 produces half again power older 29 does little no nitro new 29 interchangeable earlier model Fox 29s Isnt time trust model powerful new Fox engine 23000 Fox 29BBRC Schneurie$5995 13000 Fox 29BBCL Schneurie4495 90236 TiItup Muffler1495 90237 TlitDown Muffler1495 F OXMFG Co 5305 TOWSO14 AVEFORT SMITH ARK 72901 MasterCard Visa Accepted tions about LeCrate equipment used youll get quick answers After did Dont make head-to-head Com parisons glow engines Electrics LeCrate am living pleasant double life Radio Technique/Myers Continued aie airplane engine reversible-pitch propeller such T-max 13W T-min Beyond need two-position propeller-pitch control transmitterand would also nice have additional detent throttle mark throttle setting level flight chosen design speed 60 mph example test purposes tried RC-Ver stell-Propeller J Landert CH-8625 Gossau TeL 01 9352681 bought somebody Toledo Show 1981 according date marked box may still avail able know seems im ported Germany 11 inches diameter changes pitch 1- 15 de greeS importer still business let know Ill pass Weve finally come Turnaround transmitter Fitted Curare controlled Landing Gear switch act like two-position propeller Landert propeller gave chance test theoretical Turnaround trans mitter Let comment kept pretty busy learning fly propeller airplane same time order avoid changing propeller pitch full throttle tried school myself Throttle Down flip propeller re versing switch Throttle Up reverse pitch dive Throttle Down again initiate pullout Throt tling Up detent filed throttle-stick ratchet level flight lot main thing learned need lighter Curare Other worked thing sure made very careful landings sure dont want damage prop anyone now thinking seriously about building Turnaround transmit ter suggestion implement Propeller Pitch Control two-posi tion affair End Point Control simplest way can think to use Buddy-Box-type pushbutton Channel 5 Ace Silver Seven trans mitter setup insures pitch wont changed accidently some fooling transmitter new RC systems have End-Point Adjustment EPA Auxiliary controls could used same way George Myers 70 Froeblich Farm Rd Hicksville NY 11801 SAILPLANE LAUNCH EQUIPMENT FOR EVERY FIELD SPORTWINCH $225 0 * $300 Q9 * z inc1isd $350Q9 * $250 QP * * ptus shIpplg source QUIET FLIGHT supplies hi-starts electric motors& reducers batter ies pa rachutes tow line drums accessories braided nylon line selected kitsthe PROPHET sailplane kit moreVISA MASTERCARD DAVEY CORPORATION SYSTEMS ONE WOOD IANEMAIVERNPA19355 215644-0692 6772 Write call information aiy mat inc1ed July 1984 143 H0rn Wing Span-796 Wing Area--564 Sq JVEfW / 0~ SENSOAR glider HOBBY HORN Eaclasive HOBBY HORN Kit SENSOAR Glider kit high quality kit Machine cat 8 sanded parts Select quality balsa end spruce Detailed plans written instructions Far THERMAL SLOPE ar 05 ELECTRIC POWER VALUE PRICED 51600 IrThR KflS Pull au3 Partial Kits P & Semt-Kto Combined full stripwood plan Now intl Wire Window etc Mat fNole rhese may purchased lust semi kilo will planswrite call tsr prices 1936 Succaneer-f4-SI1 1938 Clipper MIt I-72--$30 1937 DaIlaire Sptaer109061 1941 Ranger48 027 1939 Mercury72$16 1035 MIss America94$19 1941 Playboy Jr -14020 1041 Playboy Sr00$46 1938 Pacer House94R43 1040 Sailplane70- $74 1940 So Long50$18 1039 Trenton Terror-77-S32 1930 Zlpper04049 1030 Korda Wakelleld44 037 MWWAY MODEL CO Semi-kits Combined w/strip 1936 PlyIng Quaker-04-040 3937 Quaker Flaah-6T$30 1937 Long Cabls79$42 1937 Air Chlaf61-841 STRUCKS 1540 74 Span 835 Sq SEMI-KIT Plan IncIl--033Oa flaw ruler Combo Full Kit $6300 ~ALPLANS DRAWINGS 510 HEINKEL HElOOD 62 63 sTOoo P OWR TOW P0W P Z 0DM RETRIEVER
Edition: Model Aviation - 1984/07
Page Numbers: 44, 45, 143
Radio Technique George M Myers LOT has happened around personal life past month Lee Anne Corey informed new grand child production Geoffrey visited few days job usually keeps him Inter-mountain West Chris nounced engagement Terry mother-in-law Anne lived died two blizzards fell Long Island Ive helped develop Sky Day local college helped friend put together article plane should appear magazine soon gave talks couple local clubs put off Income Tax last min ute should come no surprise say havent finished Helicopter Baron 20 powered OS Wankel talked about last month cant tell flies inverted 4 w D Y ThRUST W WEIGHT j LIFT Dx DRAG diving upright inverted because talking about constant airspeed drag function airspeed lift coefficient lift coefficient Cl wing same zero going up down drag forces must equal Youll have take word unless want break open some aerodynamics texts drag forces also will increase significantly level flight leaves us two equa tions well derive third 1 T-max W ing Up 2 T-min going Down 3 By substitution have T-max T-min 2W Now know hard get thrust-to-weight ratio 2 real airplane situation next best thing make T-min negative possible 7D Free-body force-equiIIbrlum diagrams airplane cardinal points constant-speed inside Square Loop Lets look something else Ive overheard some people talking about possible need transmitter new Turnaround pattern Since Ive al ready done some thinking about perhaps youd like take look some ideas Lets talk about Turnaround Radio first consideration airplane trend FAI toward plane flies slower weve see ing past few years first fig ure shows free-body equilibrium forces airplane flying through Inside Square Loop constant airspeed around loop assumedbecause some folks think Constant Speed looks Best Drag force will same climbing Two ways come mind Speed Brakes Reverse Pitch may need both because question answered can climb fast can dive Ive seen airplane dive constant speed reversible turboprop modification Great Lakes 2-T biplane dropped about 5000 feet 70 degree angle flared landed backed up EAA Fly-In Oshkosh WI back 1976 have movies it still looks strange thats what want. Lets say can get reversible pitch propeller will develop 50% its forward thrust reverse dive Re verse thrust bound less 100% forward thrust because ~33W L 0 Tk41i /33W 4 r TD43W Determination thrust required cardlnai points inside Square Loop constant velocity assumed 60 mph Other assumptIons T-max 133W T-min ax Whole-body dreg estimation beat giide angle expianation coiumn resuits teata would used chart Below find aerodynamic characteristics piane lift-to-drag ratio LID drag coefticlent Cd 0pPAT4 ceoew4c G ARCTAIV* L S e D~W3/N 6 44 Model Aviation DS3W L0 Th b- W %7W propeller twisted wrong di rection reverse flow used constant-pitch propeller like model Helicopter main rotor airflow around propeller would wrong because would approach front go past prop after work ing past wing nose fuselage enter rear sume really can develop 50% re verse thrust after equation 3 becomes 4 T-max -5 T-max which simplifies T-max looks like reasonable situation reasonable What speed does imply Substituting Equation 1 sim plifying yields 6 D need some kind drag estimate whole airplane way get would some engine-off glide tests varying glide speed get best possible range Measure distance traveled versus distance dropped time glide could expect see 61 glide ratio Cessna 172-type airplane glide ratios up about 15 1 clean retract-gear Pattern plane Glide speed should mea sure out 20 40 mph depending design Whatever measure distance-ratio can taken Lift/Drag ratio airplane speed example lets say measure approximate glide ratio 121 ataglidespeedof30mph same Lift/Drag ratio will apply level flight same speed Re membering Lift ht level flight lets saythat airplane weighs eight pounds whole-body drag force flying level 30 mph will 1/12th eight pounds 67 pounds Diving 30 mph wing angle zero lift would about same Since estimated diving Drag Force 33W 8 pounds equation 6 telling us need drag parachute well reverse thrust order dive 30 mph Either should decide dive fast enough develop 267 pounds drag Lets dive faster can esti mate speed needed equation drag points force D Cd dimen following table lists times seconds versus speed mph several glides assuming stopwatch started just plane passes eye level taken 5 feet high stopped hits ground some distance away Equivalent Lift/Drag ratios wholebody Coefficients Drag Cd calculated neglecting ground effect assuming pilot does flare landing Distance 2500 3003 3500 4000 5000 6000 7000 8000 10000 LID 500 600 700 800 1000 1200 1400 1600 2000 Cd 020 016 014 012 010 008 007 006 005 20 mph 085 102 119 136 1 70 205 239 273 341 Time seconds 30 mph 057 068 080 091 114 136 1 59 182 227 40 mph 043 051 060 068 085 102 119 136 1 70 sionless number S characteristic area square feet five square feet about average wing area model type q mic air pressure pounds per square foot 89 x Velocity squared Stan dard Day sea level V ex pressed feet per second cares just want Drag Force 267/67 mes larger can get simply multiplying pre vious velocity square root 4 30 mph x 2 h Can fly speed Modern Pattern planes fly faster drawing possible horsepower 60 engine want fly 60 mph level need use less power real trick pick combination Continued page 143 July 1984 45 Whats going Look prop Georges Curare Above very carefullyIts reverse pitch No hes trying fly backwardshe wants in-flight reverse thrust slow down dive speed Heres look innards Landert Reversible prop Below came box Read column find out hes tryIng thisand succeeded SHIPPING AND HANDLING 84 Page CATALOGUE Up $800 add $150$200 PP/Sat Class $801 $2000 add $225A copy will sent $2001 $4500 add $300 free-when requested$4501 $7000 add $350 order over $7000 add $400HOBBY HORN CA Addressees add 6% taxachobby specialtiescO Send MO Visa/MC#Exp15173 Moran Street Al Check allow op 30po Boa 2212 days check clearanceWestminster Ca 02883 CODExact Charges 714 8938311 Hdl Cash Only[AIl UPSI714 0051203 INTRODUCING THE NEW FOX 29 BB Bore732 Stroke715 Displacement299 RPM 96 prop.. 14000 Weight9 Ox Fuel ConsumptIon 5 ox mm Fox Schneurie 29 brand new replacement popular Baffle 29 todays modern technology latest model Fox 29 produces half again power older 29 does little no nitro new 29 interchangeable earlier model Fox 29s Isnt time trust model powerful new Fox engine 23000 Fox 29BBRC Schneurie$5995 13000 Fox 29BBCL Schneurie4495 90236 TiItup Muffler1495 90237 TlitDown Muffler1495 F OXMFG Co 5305 TOWSO14 AVEFORT SMITH ARK 72901 MasterCard Visa Accepted tions about LeCrate equipment used youll get quick answers After did Dont make head-to-head Com parisons glow engines Electrics LeCrate am living pleasant double life Radio Technique/Myers Continued aie airplane engine reversible-pitch propeller such T-max 13W T-min Beyond need two-position propeller-pitch control transmitterand would also nice have additional detent throttle mark throttle setting level flight chosen design speed 60 mph example test purposes tried RC-Ver stell-Propeller J Landert CH-8625 Gossau TeL 01 9352681 bought somebody Toledo Show 1981 according date marked box may still avail able know seems im ported Germany 11 inches diameter changes pitch 1- 15 de greeS importer still business let know Ill pass Weve finally come Turnaround transmitter Fitted Curare controlled Landing Gear switch act like two-position propeller Landert propeller gave chance test theoretical Turnaround trans mitter Let comment kept pretty busy learning fly propeller airplane same time order avoid changing propeller pitch full throttle tried school myself Throttle Down flip propeller re versing switch Throttle Up reverse pitch dive Throttle Down again initiate pullout Throt tling Up detent filed throttle-stick ratchet level flight lot main thing learned need lighter Curare Other worked thing sure made very careful landings sure dont want damage prop anyone now thinking seriously about building Turnaround transmit ter suggestion implement Propeller Pitch Control two-posi tion affair End Point Control simplest way can think to use Buddy-Box-type pushbutton Channel 5 Ace Silver Seven trans mitter setup insures pitch wont changed accidently some fooling transmitter new RC systems have End-Point Adjustment EPA Auxiliary controls could used same way George Myers 70 Froeblich Farm Rd Hicksville NY 11801 SAILPLANE LAUNCH EQUIPMENT FOR EVERY FIELD SPORTWINCH $225 0 * $300 Q9 * z inc1isd $350Q9 * $250 QP * * ptus shIpplg source QUIET FLIGHT supplies hi-starts electric motors& reducers batter ies pa rachutes tow line drums accessories braided nylon line selected kitsthe PROPHET sailplane kit moreVISA MASTERCARD DAVEY CORPORATION SYSTEMS ONE WOOD IANEMAIVERNPA19355 215644-0692 6772 Write call information aiy mat inc1ed July 1984 143 H0rn Wing Span-796 Wing Area--564 Sq JVEfW / 0~ SENSOAR glider HOBBY HORN Eaclasive HOBBY HORN Kit SENSOAR Glider kit high quality kit Machine cat 8 sanded parts Select quality balsa end spruce Detailed plans written instructions Far THERMAL SLOPE ar 05 ELECTRIC POWER VALUE PRICED 51600 IrThR KflS Pull au3 Partial Kits P & Semt-Kto Combined full stripwood plan Now intl Wire Window etc Mat fNole rhese may purchased lust semi kilo will planswrite call tsr prices 1936 Succaneer-f4-SI1 1938 Clipper MIt I-72--$30 1937 DaIlaire Sptaer109061 1941 Ranger48 027 1939 Mercury72$16 1035 MIss America94$19 1941 Playboy Jr -14020 1041 Playboy Sr00$46 1938 Pacer House94R43 1040 Sailplane70- $74 1940 So Long50$18 1039 Trenton Terror-77-S32 1930 Zlpper04049 1030 Korda Wakelleld44 037 MWWAY MODEL CO Semi-kits Combined w/strip 1936 PlyIng Quaker-04-040 3937 Quaker Flaah-6T$30 1937 Long Cabls79$42 1937 Air Chlaf61-841 STRUCKS 1540 74 Span 835 Sq SEMI-KIT Plan IncIl--033Oa flaw ruler Combo Full Kit $6300 ~ALPLANS DRAWINGS 510 HEINKEL HElOOD 62 63 sTOoo P OWR TOW P0W P Z 0DM RETRIEVER