Radio Technique George M Myers WANT report new top-of-the-line transmitter Im going kill two birds stone too because Ill also com ment its features Helicopter radio looking its tuneable-frequency feature Kraft Mk IV Helicopter radio What have essentially custom-built transmitter Ive heard 50 built some havent sold yet Helicopter-oriented control layout designed Mike Byrd consensus expert fliers opinions about what wanted trans mitter built America Americans accept unique Kraft Channel Max 49-channel FM module should able understand wanted Maybe dont place value going field selecting channel no else using control adjustments thing expected Kraft lists 28 external controls switches adjust ments found 16 inside including reversing switches assorted control throw adjustments fact poke around inside box make discoveries isnt particularly surprising since believe unit prototypes Its manual two sheets like prospectus Kraft 40 Model Aviation Take good look radios photo theyre both unusual left AMAS experimental 926 MHz set being tested Tom Hunts Hi-Tech 2002 next version modei featured construction articie October MA right Georges Kraft Channei Max Heiicopter radiohere being used stiff-wing Curare George has in-depth discussion radio its host controis adjustments month Front rear views Georges new KPT7CH Mk IV transmitter give insight useful complexity top-notch HelIcopter transmit ter Note knobs switches adjustments top case plus several inside handing out model shows Mark IV modified KP7C KP7C manual included give point reference showed revers ing switches said nothing about adjustments modulator board Since average purchaser cant re quired have digital pulse meter its possible would get screwdriver like Hansel Gretel forget way back home telling him what potentiometers home practically guarantees other hand making him find way home cut-and-try method also guarantees will have some famili arity pots what does get Whats philosophy Nothing succeeds aviation like flying thing first tried Mk IV trusty stiff-winged Curare regular readers already know Thats discovered synthesized transmitter RF tuning precise couldnt control KPR-8FD crystal controlled receiver RC52 though old-style Kraft Gold Spectrum 6 trans mitter its new crystal-controlled FM module did just fine same receiv er As turned out deter mined use old receiver would have retune match syn thesized transmitter easy enough However retune meant remov ing receiver plane simpler just plug new synthesized receiver its place short search inside transmitter revealed unidentified switch cir cuit board under Helicopter controls coupled/uncoupled Throttle/Rudder mixing Shortly afterward found Throttle control centered differently Krafts usual 1 4Oms wasnt particularly hard find pot modulator board controlled Throttle centering corrected writing down value found adjusted factory ques tioned Mike Byrd about explained fitted inverted flying helicopter Since trying fly stiff-wing airplane time done confuse Obviously uni dentified switch isnt meant used Airplane/Helicopter switch next test bed Baron 20 heli copter fact already Kraft gyro KPS-24 servos may have something choice Krafts synthesized receiver looks quite large fits tiny Baron 20 cabin quite easily Looks deceptive got field discovered managed setups Normal/Invert switch vert position Since controls seemed otherwise normal decided fly way selected usual channel RC5O dared Empire Paging 75 watts Continued page 132 November 1984 41 8 25 EM 3 EM SANTOS FONT 1 U CLOSED ROPEN THROTTLE Georges Kraft radio friends Santos Fonts Futaba both have ThrottielCoiiective mixing have different styie flying too sketch shows flier has adjusted ThrottlelColictive mixing George discusses coiumn Georges Channel Max KPR-SFDS receiver although bit large size still fits neatly inside tiny Baron 20 cabinin fact fits same space former tennant Ace Silver Seven receiver although has less foam padding around other things motor must running prop stop engaged should running prop stop retracted far enough con siderable comfortable range between Most models use Ace R/G glider skid case Spectra necessary cut skid material half two Y4-in-wide pieces arrange around air exit holes oper ation cutting can bit testy can done anchor skid material very securely very nose some /2-in-wide brass dont use such anchor skid will tear off no doubt case sure covering material securely stuck fuselage before stick ing skid material can done Ive using scheme years no problems flying field ground environment particularly harsh frequent tearing fuselage bottom covering occurs try running some auto trim tape stripes along fuselage bottom tape can big help trim looks good too Spectra completeready flyit should weigh somewhere tween 35 39 oz its over 40 youve done something will hurt its flying ability its under 35 please tell did weight range holds versions Spectra six 12 Ah cells Other batteries course can make big difference youve followed plans text have built surfaces warp-free fly ing should both snap pure pleas ure Launch straight out nose pointed little downward take Remember Electrics char acteristically fly wing prop Go easy up-elevator Fly what want horse Have happy quiet time May Electric Elation * * Long Engine Life * * Use BRU LINE Air Cleaner Completely Fuel Proof Nylon Rubber Parts Cat No 102 Air Cleaner Coarse Cat No 202 Air Cleaner Fine Replacement Inserts Cat No 104 Pkl2 Inserts Coarse Cat No 204 PkJ2 Inserts Fine $225 $225 $195 $195 Radio TechniquslMyor Continued page 41 12 miles 10 kHz away inter fere didnt flew transmitter antenna totally collapsed unscrewed test hop showed machine flyable offered friends Santos Font fly Santos very cautious checking machine out complained about insuffi cient forward stick could see Santos moved Elevator trim Full Forward couple quick adjustments snaplinks failed satisfy him took machine back tailgate Ford further vestigation Thats discovered Elevator trim worked opposite stick Hmmm Further investigation revealed Rudder Rudder Trim Col lective Elevator could reversed Invert switch Elevator Trim Collective Trim File away memory banks Change Notice followed standard setup pro cedure Baron 20 blocked Teeter Arm Swash Plate perpen dicular main rotor mast set up links things parallel perpendicular another ap propriate servos energized transmitter both sticks centered Hover Mode trims set Neutral except Throttle Trim High main rotor pitch set 54 degrees Tail Rotor set tip difference 15 inches blades folded parallel settings obtained previous flights Using procedure machine trimmed liking first liftoff Santos tried improve trim discovered problem missed Santos moves Superior very abrupt ly wondered did course flying Baron 20 Santos told set Futaba transmitter Collective Pitch stayed 0 degrees way up half throttle creased rapidly havent figured out set Kraft up way fact done just opposite Col $8995 Shrpping Tex Res 8/o Pre-Built Fuselage Balsa Sheeted Foam Wings Totally Pre-Cut Fiberglass Cowl CJ ENTERPRISES 512 7830489 Rt 2 Box 238 M Pharr Texas 78577 lective pitch angle follow Throttle opening up halfway point fall behind producing less constantrpm situation above Hover setup pro duces much gentler control action think Realistic needs full Left Rudder land annoying other hand machine cant made jump up down way Santos Superior can Take choice possible could go lot technical data now doubt would find teresting KP7CH Mark IV radio works nicely since has op tions takes some concentrated study learn use everything got could use Channel Max module dont regret decision first thought Kraft Mk IV quite departure Airtronics CS-5H Helicopter radio discussed column June 1984 issue Airtronics system came good docu mentation followed book made everything seem simple Though have described Airtronics CS-5H basic Helicopter radio dont Want think unsophis ticated Helicopter radios sophisticated airplane radios have taken seriously Heli copter transmitter must mix Throttle Rudder Throttle/Collective Pitch requires two mixers five control channels ie must control five ser vos minimum Most add Gear Switch used control gyro ON/OFF switch between two levels sensitivity Thus Basic Helicopter Radio will have five user controls six active control channels added bit sophistication gives another thing learn point trying make about Airtronics Helicopter system gives you need leaves out some extras can extend beginners initial learning period instance cant adjust pitch curve electronically cant waste time misadjusting either Airtronics CS-5H has no shortage controls fact will find 39 con132 Model Aviation FITS MOST ENGINES 25 UP SEE YOUR LOCAL HOBBY DEALER IF UNAVAILABLE LOCALLY SEND TO Add 75 shippingMichigan residents add 4% sales tax Bru Line Industries Inc PO Box 3786 Center Line Michigan 48015 responding advertisers mention read about Model Aviation S KY FOX SPORT FLYER Wing Span Wing Area Length Weight Engine Radio SEE YOUR 54 Inches 620 Sq 43 Inches 55 Lbs 4050 4 Channel DEALER RLA MODELS513 859-7839 P 0 BOX 640 WEST CARROLLTON OHIO 45449 Direct Orders Send check money order pay shipping handling Ohio residents add 6% Sales Tax $8995 trols adjustments its transmitter two adjust stick-centering force lacks Collective Pitch Trim Collective Pitch Curve Adjustments have things presetting belicrank angles adjusting ball snaplinks mind system has features other could use Both long long way Basic Airplane Radio four-functions nine controls Kraft systems flight pack feeding Kraft gyro KPR-8FDS receiver five KPS-24 servos delivers 150 mA servos stationary two servos moving freely easily-duplicated condition current drain jumps 550 mA use 5R900 pack gives about two hours operating time operating conditions better some voltage measurements before flight stop flying instant flight pack voltage drops below 48 VDC under load you ask Both Kraft Airtronics transmitter have built-in ESVs Flight Pack both come long cord plugs helicopters Charging Jack purpose assess ing flight pack voltage Use before flight know its little inconvenient carry because nei ther transmitter provides storage packet test cords So make yourself no excuse will undo crash damage Ive done little testing now meters red-lined 48 volts needle drops below point head charger Never mind 44 volts stuff. thats charge exhausted basic continuous drain Helicopter gyro over 150 mA flight time remaining after 47 volts has reached desperately shortI estimate generally less time burn tank fuel Baron 20 tank lasts 10 minutes flight Heli Boy tank lasts 27 minutes could exhaust batteries flight either case after youve lifted off 47 volts speak experience Dont neglect transmitter batteries either Kraft strongly advises stop flying transmitter pack reaches 96 volts judging way system degenerated let run down below point ground tests agree dont like built-in meters alternatives ESVs Ex panded-Scale Voltmeters built-in load resistors available ac cessory market Just sure use some thing Ive asked Which better Synthe sized RF PCM no better case because different things both can used same transmitter fact Ill very surprised Futaba Circus dont add synthe sizer PCM sets next year George M Myers 70 Froehlich Farm Rd Hicksville NY 11801 AirfoilslBrownlee Continued page 42 symmetrical cambered sections RN below million showing smooth stall tendency Large negative pitching moments undesirable higher efficient values CL unless center gravity located behind center pressure wing Otherwise tall will have develop down load trim wing will turn have lift addition aircraft weight added induced drag resulting can substantial five-digit sections devised solve problem retaining same thickness distribution changing equations mean line first three numbers together denote NACA mean line sections variously cam bered DLC 015 times first number second two numbers gether twice distance percent Qf chord point maximum camber last two numbers again thick ness results successful showing very low pitching moments particularly 18-21 07o thickness range Another series 1 middle place 0 devised give theoretical zero pitching moment used sections have reputation violent stalls full scale should tame realm shape basic thickness distri bution four- five-digit sections results minimum pressure maximum velocity air flow 75 1007o back leading edge RN 9 10 million range flow turbulent over about 80-85% surface well below flight RN large fast aircraft objective 6-series sec tions develop basic thickness shapes would move minimum pressure point far back possible provide controlled drop pressure trigger premature transition laminar turbulent flow 6- merely separates sections 1- through 5- 7- 8-series second number denotes minimum pressure point tenths chord basic thickness form third number either following comma wntten subscript denotes extent above below DLC tenths low drag bucket range function thickness will about two 15% three 18% etc notation omit ted basic thicknesses below 12070 subscript ordinates represent later devel opment efforts first number after dash 10 times DLC last two thick ness either whole November1984 133 Engineered tne sport moacler mind
Edition: Model Aviation - 1984/11
Page Numbers: 40, 41, 132, 133
Radio Technique George M Myers WANT report new top-of-the-line transmitter Im going kill two birds stone too because Ill also com ment its features Helicopter radio looking its tuneable-frequency feature Kraft Mk IV Helicopter radio What have essentially custom-built transmitter Ive heard 50 built some havent sold yet Helicopter-oriented control layout designed Mike Byrd consensus expert fliers opinions about what wanted trans mitter built America Americans accept unique Kraft Channel Max 49-channel FM module should able understand wanted Maybe dont place value going field selecting channel no else using control adjustments thing expected Kraft lists 28 external controls switches adjust ments found 16 inside including reversing switches assorted control throw adjustments fact poke around inside box make discoveries isnt particularly surprising since believe unit prototypes Its manual two sheets like prospectus Kraft 40 Model Aviation Take good look radios photo theyre both unusual left AMAS experimental 926 MHz set being tested Tom Hunts Hi-Tech 2002 next version modei featured construction articie October MA right Georges Kraft Channei Max Heiicopter radiohere being used stiff-wing Curare George has in-depth discussion radio its host controis adjustments month Front rear views Georges new KPT7CH Mk IV transmitter give insight useful complexity top-notch HelIcopter transmit ter Note knobs switches adjustments top case plus several inside handing out model shows Mark IV modified KP7C KP7C manual included give point reference showed revers ing switches said nothing about adjustments modulator board Since average purchaser cant re quired have digital pulse meter its possible would get screwdriver like Hansel Gretel forget way back home telling him what potentiometers home practically guarantees other hand making him find way home cut-and-try method also guarantees will have some famili arity pots what does get Whats philosophy Nothing succeeds aviation like flying thing first tried Mk IV trusty stiff-winged Curare regular readers already know Thats discovered synthesized transmitter RF tuning precise couldnt control KPR-8FD crystal controlled receiver RC52 though old-style Kraft Gold Spectrum 6 trans mitter its new crystal-controlled FM module did just fine same receiv er As turned out deter mined use old receiver would have retune match syn thesized transmitter easy enough However retune meant remov ing receiver plane simpler just plug new synthesized receiver its place short search inside transmitter revealed unidentified switch cir cuit board under Helicopter controls coupled/uncoupled Throttle/Rudder mixing Shortly afterward found Throttle control centered differently Krafts usual 1 4Oms wasnt particularly hard find pot modulator board controlled Throttle centering corrected writing down value found adjusted factory ques tioned Mike Byrd about explained fitted inverted flying helicopter Since trying fly stiff-wing airplane time done confuse Obviously uni dentified switch isnt meant used Airplane/Helicopter switch next test bed Baron 20 heli copter fact already Kraft gyro KPS-24 servos may have something choice Krafts synthesized receiver looks quite large fits tiny Baron 20 cabin quite easily Looks deceptive got field discovered managed setups Normal/Invert switch vert position Since controls seemed otherwise normal decided fly way selected usual channel RC5O dared Empire Paging 75 watts Continued page 132 November 1984 41 8 25 EM 3 EM SANTOS FONT 1 U CLOSED ROPEN THROTTLE Georges Kraft radio friends Santos Fonts Futaba both have ThrottielCoiiective mixing have different styie flying too sketch shows flier has adjusted ThrottlelColictive mixing George discusses coiumn Georges Channel Max KPR-SFDS receiver although bit large size still fits neatly inside tiny Baron 20 cabinin fact fits same space former tennant Ace Silver Seven receiver although has less foam padding around other things motor must running prop stop engaged should running prop stop retracted far enough con siderable comfortable range between Most models use Ace R/G glider skid case Spectra necessary cut skid material half two Y4-in-wide pieces arrange around air exit holes oper ation cutting can bit testy can done anchor skid material very securely very nose some /2-in-wide brass dont use such anchor skid will tear off no doubt case sure covering material securely stuck fuselage before stick ing skid material can done Ive using scheme years no problems flying field ground environment particularly harsh frequent tearing fuselage bottom covering occurs try running some auto trim tape stripes along fuselage bottom tape can big help trim looks good too Spectra completeready flyit should weigh somewhere tween 35 39 oz its over 40 youve done something will hurt its flying ability its under 35 please tell did weight range holds versions Spectra six 12 Ah cells Other batteries course can make big difference youve followed plans text have built surfaces warp-free fly ing should both snap pure pleas ure Launch straight out nose pointed little downward take Remember Electrics char acteristically fly wing prop Go easy up-elevator Fly what want horse Have happy quiet time May Electric Elation * * Long Engine Life * * Use BRU LINE Air Cleaner Completely Fuel Proof Nylon Rubber Parts Cat No 102 Air Cleaner Coarse Cat No 202 Air Cleaner Fine Replacement Inserts Cat No 104 Pkl2 Inserts Coarse Cat No 204 PkJ2 Inserts Fine $225 $225 $195 $195 Radio TechniquslMyor Continued page 41 12 miles 10 kHz away inter fere didnt flew transmitter antenna totally collapsed unscrewed test hop showed machine flyable offered friends Santos Font fly Santos very cautious checking machine out complained about insuffi cient forward stick could see Santos moved Elevator trim Full Forward couple quick adjustments snaplinks failed satisfy him took machine back tailgate Ford further vestigation Thats discovered Elevator trim worked opposite stick Hmmm Further investigation revealed Rudder Rudder Trim Col lective Elevator could reversed Invert switch Elevator Trim Collective Trim File away memory banks Change Notice followed standard setup pro cedure Baron 20 blocked Teeter Arm Swash Plate perpen dicular main rotor mast set up links things parallel perpendicular another ap propriate servos energized transmitter both sticks centered Hover Mode trims set Neutral except Throttle Trim High main rotor pitch set 54 degrees Tail Rotor set tip difference 15 inches blades folded parallel settings obtained previous flights Using procedure machine trimmed liking first liftoff Santos tried improve trim discovered problem missed Santos moves Superior very abrupt ly wondered did course flying Baron 20 Santos told set Futaba transmitter Collective Pitch stayed 0 degrees way up half throttle creased rapidly havent figured out set Kraft up way fact done just opposite Col $8995 Shrpping Tex Res 8/o Pre-Built Fuselage Balsa Sheeted Foam Wings Totally Pre-Cut Fiberglass Cowl CJ ENTERPRISES 512 7830489 Rt 2 Box 238 M Pharr Texas 78577 lective pitch angle follow Throttle opening up halfway point fall behind producing less constantrpm situation above Hover setup pro duces much gentler control action think Realistic needs full Left Rudder land annoying other hand machine cant made jump up down way Santos Superior can Take choice possible could go lot technical data now doubt would find teresting KP7CH Mark IV radio works nicely since has op tions takes some concentrated study learn use everything got could use Channel Max module dont regret decision first thought Kraft Mk IV quite departure Airtronics CS-5H Helicopter radio discussed column June 1984 issue Airtronics system came good docu mentation followed book made everything seem simple Though have described Airtronics CS-5H basic Helicopter radio dont Want think unsophis ticated Helicopter radios sophisticated airplane radios have taken seriously Heli copter transmitter must mix Throttle Rudder Throttle/Collective Pitch requires two mixers five control channels ie must control five ser vos minimum Most add Gear Switch used control gyro ON/OFF switch between two levels sensitivity Thus Basic Helicopter Radio will have five user controls six active control channels added bit sophistication gives another thing learn point trying make about Airtronics Helicopter system gives you need leaves out some extras can extend beginners initial learning period instance cant adjust pitch curve electronically cant waste time misadjusting either Airtronics CS-5H has no shortage controls fact will find 39 con132 Model Aviation FITS MOST ENGINES 25 UP SEE YOUR LOCAL HOBBY DEALER IF UNAVAILABLE LOCALLY SEND TO Add 75 shippingMichigan residents add 4% sales tax Bru Line Industries Inc PO Box 3786 Center Line Michigan 48015 responding advertisers mention read about Model Aviation S KY FOX SPORT FLYER Wing Span Wing Area Length Weight Engine Radio SEE YOUR 54 Inches 620 Sq 43 Inches 55 Lbs 4050 4 Channel DEALER RLA MODELS513 859-7839 P 0 BOX 640 WEST CARROLLTON OHIO 45449 Direct Orders Send check money order pay shipping handling Ohio residents add 6% Sales Tax $8995 trols adjustments its transmitter two adjust stick-centering force lacks Collective Pitch Trim Collective Pitch Curve Adjustments have things presetting belicrank angles adjusting ball snaplinks mind system has features other could use Both long long way Basic Airplane Radio four-functions nine controls Kraft systems flight pack feeding Kraft gyro KPR-8FDS receiver five KPS-24 servos delivers 150 mA servos stationary two servos moving freely easily-duplicated condition current drain jumps 550 mA use 5R900 pack gives about two hours operating time operating conditions better some voltage measurements before flight stop flying instant flight pack voltage drops below 48 VDC under load you ask Both Kraft Airtronics transmitter have built-in ESVs Flight Pack both come long cord plugs helicopters Charging Jack purpose assess ing flight pack voltage Use before flight know its little inconvenient carry because nei ther transmitter provides storage packet test cords So make yourself no excuse will undo crash damage Ive done little testing now meters red-lined 48 volts needle drops below point head charger Never mind 44 volts stuff. thats charge exhausted basic continuous drain Helicopter gyro over 150 mA flight time remaining after 47 volts has reached desperately shortI estimate generally less time burn tank fuel Baron 20 tank lasts 10 minutes flight Heli Boy tank lasts 27 minutes could exhaust batteries flight either case after youve lifted off 47 volts speak experience Dont neglect transmitter batteries either Kraft strongly advises stop flying transmitter pack reaches 96 volts judging way system degenerated let run down below point ground tests agree dont like built-in meters alternatives ESVs Ex panded-Scale Voltmeters built-in load resistors available ac cessory market Just sure use some thing Ive asked Which better Synthe sized RF PCM no better case because different things both can used same transmitter fact Ill very surprised Futaba Circus dont add synthe sizer PCM sets next year George M Myers 70 Froehlich Farm Rd Hicksville NY 11801 AirfoilslBrownlee Continued page 42 symmetrical cambered sections RN below million showing smooth stall tendency Large negative pitching moments undesirable higher efficient values CL unless center gravity located behind center pressure wing Otherwise tall will have develop down load trim wing will turn have lift addition aircraft weight added induced drag resulting can substantial five-digit sections devised solve problem retaining same thickness distribution changing equations mean line first three numbers together denote NACA mean line sections variously cam bered DLC 015 times first number second two numbers gether twice distance percent Qf chord point maximum camber last two numbers again thick ness results successful showing very low pitching moments particularly 18-21 07o thickness range Another series 1 middle place 0 devised give theoretical zero pitching moment used sections have reputation violent stalls full scale should tame realm shape basic thickness distri bution four- five-digit sections results minimum pressure maximum velocity air flow 75 1007o back leading edge RN 9 10 million range flow turbulent over about 80-85% surface well below flight RN large fast aircraft objective 6-series sec tions develop basic thickness shapes would move minimum pressure point far back possible provide controlled drop pressure trigger premature transition laminar turbulent flow 6- merely separates sections 1- through 5- 7- 8-series second number denotes minimum pressure point tenths chord basic thickness form third number either following comma wntten subscript denotes extent above below DLC tenths low drag bucket range function thickness will about two 15% three 18% etc notation omit ted basic thicknesses below 12070 subscript ordinates represent later devel opment efforts first number after dash 10 times DLC last two thick ness either whole November1984 133 Engineered tne sport moacler mind
Edition: Model Aviation - 1984/11
Page Numbers: 40, 41, 132, 133
Radio Technique George M Myers WANT report new top-of-the-line transmitter Im going kill two birds stone too because Ill also com ment its features Helicopter radio looking its tuneable-frequency feature Kraft Mk IV Helicopter radio What have essentially custom-built transmitter Ive heard 50 built some havent sold yet Helicopter-oriented control layout designed Mike Byrd consensus expert fliers opinions about what wanted trans mitter built America Americans accept unique Kraft Channel Max 49-channel FM module should able understand wanted Maybe dont place value going field selecting channel no else using control adjustments thing expected Kraft lists 28 external controls switches adjust ments found 16 inside including reversing switches assorted control throw adjustments fact poke around inside box make discoveries isnt particularly surprising since believe unit prototypes Its manual two sheets like prospectus Kraft 40 Model Aviation Take good look radios photo theyre both unusual left AMAS experimental 926 MHz set being tested Tom Hunts Hi-Tech 2002 next version modei featured construction articie October MA right Georges Kraft Channei Max Heiicopter radiohere being used stiff-wing Curare George has in-depth discussion radio its host controis adjustments month Front rear views Georges new KPT7CH Mk IV transmitter give insight useful complexity top-notch HelIcopter transmit ter Note knobs switches adjustments top case plus several inside handing out model shows Mark IV modified KP7C KP7C manual included give point reference showed revers ing switches said nothing about adjustments modulator board Since average purchaser cant re quired have digital pulse meter its possible would get screwdriver like Hansel Gretel forget way back home telling him what potentiometers home practically guarantees other hand making him find way home cut-and-try method also guarantees will have some famili arity pots what does get Whats philosophy Nothing succeeds aviation like flying thing first tried Mk IV trusty stiff-winged Curare regular readers already know Thats discovered synthesized transmitter RF tuning precise couldnt control KPR-8FD crystal controlled receiver RC52 though old-style Kraft Gold Spectrum 6 trans mitter its new crystal-controlled FM module did just fine same receiv er As turned out deter mined use old receiver would have retune match syn thesized transmitter easy enough However retune meant remov ing receiver plane simpler just plug new synthesized receiver its place short search inside transmitter revealed unidentified switch cir cuit board under Helicopter controls coupled/uncoupled Throttle/Rudder mixing Shortly afterward found Throttle control centered differently Krafts usual 1 4Oms wasnt particularly hard find pot modulator board controlled Throttle centering corrected writing down value found adjusted factory ques tioned Mike Byrd about explained fitted inverted flying helicopter Since trying fly stiff-wing airplane time done confuse Obviously uni dentified switch isnt meant used Airplane/Helicopter switch next test bed Baron 20 heli copter fact already Kraft gyro KPS-24 servos may have something choice Krafts synthesized receiver looks quite large fits tiny Baron 20 cabin quite easily Looks deceptive got field discovered managed setups Normal/Invert switch vert position Since controls seemed otherwise normal decided fly way selected usual channel RC5O dared Empire Paging 75 watts Continued page 132 November 1984 41 8 25 EM 3 EM SANTOS FONT 1 U CLOSED ROPEN THROTTLE Georges Kraft radio friends Santos Fonts Futaba both have ThrottielCoiiective mixing have different styie flying too sketch shows flier has adjusted ThrottlelColictive mixing George discusses coiumn Georges Channel Max KPR-SFDS receiver although bit large size still fits neatly inside tiny Baron 20 cabinin fact fits same space former tennant Ace Silver Seven receiver although has less foam padding around other things motor must running prop stop engaged should running prop stop retracted far enough con siderable comfortable range between Most models use Ace R/G glider skid case Spectra necessary cut skid material half two Y4-in-wide pieces arrange around air exit holes oper ation cutting can bit testy can done anchor skid material very securely very nose some /2-in-wide brass dont use such anchor skid will tear off no doubt case sure covering material securely stuck fuselage before stick ing skid material can done Ive using scheme years no problems flying field ground environment particularly harsh frequent tearing fuselage bottom covering occurs try running some auto trim tape stripes along fuselage bottom tape can big help trim looks good too Spectra completeready flyit should weigh somewhere tween 35 39 oz its over 40 youve done something will hurt its flying ability its under 35 please tell did weight range holds versions Spectra six 12 Ah cells Other batteries course can make big difference youve followed plans text have built surfaces warp-free fly ing should both snap pure pleas ure Launch straight out nose pointed little downward take Remember Electrics char acteristically fly wing prop Go easy up-elevator Fly what want horse Have happy quiet time May Electric Elation * * Long Engine Life * * Use BRU LINE Air Cleaner Completely Fuel Proof Nylon Rubber Parts Cat No 102 Air Cleaner Coarse Cat No 202 Air Cleaner Fine Replacement Inserts Cat No 104 Pkl2 Inserts Coarse Cat No 204 PkJ2 Inserts Fine $225 $225 $195 $195 Radio TechniquslMyor Continued page 41 12 miles 10 kHz away inter fere didnt flew transmitter antenna totally collapsed unscrewed test hop showed machine flyable offered friends Santos Font fly Santos very cautious checking machine out complained about insuffi cient forward stick could see Santos moved Elevator trim Full Forward couple quick adjustments snaplinks failed satisfy him took machine back tailgate Ford further vestigation Thats discovered Elevator trim worked opposite stick Hmmm Further investigation revealed Rudder Rudder Trim Col lective Elevator could reversed Invert switch Elevator Trim Collective Trim File away memory banks Change Notice followed standard setup pro cedure Baron 20 blocked Teeter Arm Swash Plate perpen dicular main rotor mast set up links things parallel perpendicular another ap propriate servos energized transmitter both sticks centered Hover Mode trims set Neutral except Throttle Trim High main rotor pitch set 54 degrees Tail Rotor set tip difference 15 inches blades folded parallel settings obtained previous flights Using procedure machine trimmed liking first liftoff Santos tried improve trim discovered problem missed Santos moves Superior very abrupt ly wondered did course flying Baron 20 Santos told set Futaba transmitter Collective Pitch stayed 0 degrees way up half throttle creased rapidly havent figured out set Kraft up way fact done just opposite Col $8995 Shrpping Tex Res 8/o Pre-Built Fuselage Balsa Sheeted Foam Wings Totally Pre-Cut Fiberglass Cowl CJ ENTERPRISES 512 7830489 Rt 2 Box 238 M Pharr Texas 78577 lective pitch angle follow Throttle opening up halfway point fall behind producing less constantrpm situation above Hover setup pro duces much gentler control action think Realistic needs full Left Rudder land annoying other hand machine cant made jump up down way Santos Superior can Take choice possible could go lot technical data now doubt would find teresting KP7CH Mark IV radio works nicely since has op tions takes some concentrated study learn use everything got could use Channel Max module dont regret decision first thought Kraft Mk IV quite departure Airtronics CS-5H Helicopter radio discussed column June 1984 issue Airtronics system came good docu mentation followed book made everything seem simple Though have described Airtronics CS-5H basic Helicopter radio dont Want think unsophis ticated Helicopter radios sophisticated airplane radios have taken seriously Heli copter transmitter must mix Throttle Rudder Throttle/Collective Pitch requires two mixers five control channels ie must control five ser vos minimum Most add Gear Switch used control gyro ON/OFF switch between two levels sensitivity Thus Basic Helicopter Radio will have five user controls six active control channels added bit sophistication gives another thing learn point trying make about Airtronics Helicopter system gives you need leaves out some extras can extend beginners initial learning period instance cant adjust pitch curve electronically cant waste time misadjusting either Airtronics CS-5H has no shortage controls fact will find 39 con132 Model Aviation FITS MOST ENGINES 25 UP SEE YOUR LOCAL HOBBY DEALER IF UNAVAILABLE LOCALLY SEND TO Add 75 shippingMichigan residents add 4% sales tax Bru Line Industries Inc PO Box 3786 Center Line Michigan 48015 responding advertisers mention read about Model Aviation S KY FOX SPORT FLYER Wing Span Wing Area Length Weight Engine Radio SEE YOUR 54 Inches 620 Sq 43 Inches 55 Lbs 4050 4 Channel DEALER RLA MODELS513 859-7839 P 0 BOX 640 WEST CARROLLTON OHIO 45449 Direct Orders Send check money order pay shipping handling Ohio residents add 6% Sales Tax $8995 trols adjustments its transmitter two adjust stick-centering force lacks Collective Pitch Trim Collective Pitch Curve Adjustments have things presetting belicrank angles adjusting ball snaplinks mind system has features other could use Both long long way Basic Airplane Radio four-functions nine controls Kraft systems flight pack feeding Kraft gyro KPR-8FDS receiver five KPS-24 servos delivers 150 mA servos stationary two servos moving freely easily-duplicated condition current drain jumps 550 mA use 5R900 pack gives about two hours operating time operating conditions better some voltage measurements before flight stop flying instant flight pack voltage drops below 48 VDC under load you ask Both Kraft Airtronics transmitter have built-in ESVs Flight Pack both come long cord plugs helicopters Charging Jack purpose assess ing flight pack voltage Use before flight know its little inconvenient carry because nei ther transmitter provides storage packet test cords So make yourself no excuse will undo crash damage Ive done little testing now meters red-lined 48 volts needle drops below point head charger Never mind 44 volts stuff. thats charge exhausted basic continuous drain Helicopter gyro over 150 mA flight time remaining after 47 volts has reached desperately shortI estimate generally less time burn tank fuel Baron 20 tank lasts 10 minutes flight Heli Boy tank lasts 27 minutes could exhaust batteries flight either case after youve lifted off 47 volts speak experience Dont neglect transmitter batteries either Kraft strongly advises stop flying transmitter pack reaches 96 volts judging way system degenerated let run down below point ground tests agree dont like built-in meters alternatives ESVs Ex panded-Scale Voltmeters built-in load resistors available ac cessory market Just sure use some thing Ive asked Which better Synthe sized RF PCM no better case because different things both can used same transmitter fact Ill very surprised Futaba Circus dont add synthe sizer PCM sets next year George M Myers 70 Froehlich Farm Rd Hicksville NY 11801 AirfoilslBrownlee Continued page 42 symmetrical cambered sections RN below million showing smooth stall tendency Large negative pitching moments undesirable higher efficient values CL unless center gravity located behind center pressure wing Otherwise tall will have develop down load trim wing will turn have lift addition aircraft weight added induced drag resulting can substantial five-digit sections devised solve problem retaining same thickness distribution changing equations mean line first three numbers together denote NACA mean line sections variously cam bered DLC 015 times first number second two numbers gether twice distance percent Qf chord point maximum camber last two numbers again thick ness results successful showing very low pitching moments particularly 18-21 07o thickness range Another series 1 middle place 0 devised give theoretical zero pitching moment used sections have reputation violent stalls full scale should tame realm shape basic thickness distri bution four- five-digit sections results minimum pressure maximum velocity air flow 75 1007o back leading edge RN 9 10 million range flow turbulent over about 80-85% surface well below flight RN large fast aircraft objective 6-series sec tions develop basic thickness shapes would move minimum pressure point far back possible provide controlled drop pressure trigger premature transition laminar turbulent flow 6- merely separates sections 1- through 5- 7- 8-series second number denotes minimum pressure point tenths chord basic thickness form third number either following comma wntten subscript denotes extent above below DLC tenths low drag bucket range function thickness will about two 15% three 18% etc notation omit ted basic thicknesses below 12070 subscript ordinates represent later devel opment efforts first number after dash 10 times DLC last two thick ness either whole November1984 133 Engineered tne sport moacler mind
Edition: Model Aviation - 1984/11
Page Numbers: 40, 41, 132, 133
Radio Technique George M Myers WANT report new top-of-the-line transmitter Im going kill two birds stone too because Ill also com ment its features Helicopter radio looking its tuneable-frequency feature Kraft Mk IV Helicopter radio What have essentially custom-built transmitter Ive heard 50 built some havent sold yet Helicopter-oriented control layout designed Mike Byrd consensus expert fliers opinions about what wanted trans mitter built America Americans accept unique Kraft Channel Max 49-channel FM module should able understand wanted Maybe dont place value going field selecting channel no else using control adjustments thing expected Kraft lists 28 external controls switches adjust ments found 16 inside including reversing switches assorted control throw adjustments fact poke around inside box make discoveries isnt particularly surprising since believe unit prototypes Its manual two sheets like prospectus Kraft 40 Model Aviation Take good look radios photo theyre both unusual left AMAS experimental 926 MHz set being tested Tom Hunts Hi-Tech 2002 next version modei featured construction articie October MA right Georges Kraft Channei Max Heiicopter radiohere being used stiff-wing Curare George has in-depth discussion radio its host controis adjustments month Front rear views Georges new KPT7CH Mk IV transmitter give insight useful complexity top-notch HelIcopter transmit ter Note knobs switches adjustments top case plus several inside handing out model shows Mark IV modified KP7C KP7C manual included give point reference showed revers ing switches said nothing about adjustments modulator board Since average purchaser cant re quired have digital pulse meter its possible would get screwdriver like Hansel Gretel forget way back home telling him what potentiometers home practically guarantees other hand making him find way home cut-and-try method also guarantees will have some famili arity pots what does get Whats philosophy Nothing succeeds aviation like flying thing first tried Mk IV trusty stiff-winged Curare regular readers already know Thats discovered synthesized transmitter RF tuning precise couldnt control KPR-8FD crystal controlled receiver RC52 though old-style Kraft Gold Spectrum 6 trans mitter its new crystal-controlled FM module did just fine same receiv er As turned out deter mined use old receiver would have retune match syn thesized transmitter easy enough However retune meant remov ing receiver plane simpler just plug new synthesized receiver its place short search inside transmitter revealed unidentified switch cir cuit board under Helicopter controls coupled/uncoupled Throttle/Rudder mixing Shortly afterward found Throttle control centered differently Krafts usual 1 4Oms wasnt particularly hard find pot modulator board controlled Throttle centering corrected writing down value found adjusted factory ques tioned Mike Byrd about explained fitted inverted flying helicopter Since trying fly stiff-wing airplane time done confuse Obviously uni dentified switch isnt meant used Airplane/Helicopter switch next test bed Baron 20 heli copter fact already Kraft gyro KPS-24 servos may have something choice Krafts synthesized receiver looks quite large fits tiny Baron 20 cabin quite easily Looks deceptive got field discovered managed setups Normal/Invert switch vert position Since controls seemed otherwise normal decided fly way selected usual channel RC5O dared Empire Paging 75 watts Continued page 132 November 1984 41 8 25 EM 3 EM SANTOS FONT 1 U CLOSED ROPEN THROTTLE Georges Kraft radio friends Santos Fonts Futaba both have ThrottielCoiiective mixing have different styie flying too sketch shows flier has adjusted ThrottlelColictive mixing George discusses coiumn Georges Channel Max KPR-SFDS receiver although bit large size still fits neatly inside tiny Baron 20 cabinin fact fits same space former tennant Ace Silver Seven receiver although has less foam padding around other things motor must running prop stop engaged should running prop stop retracted far enough con siderable comfortable range between Most models use Ace R/G glider skid case Spectra necessary cut skid material half two Y4-in-wide pieces arrange around air exit holes oper ation cutting can bit testy can done anchor skid material very securely very nose some /2-in-wide brass dont use such anchor skid will tear off no doubt case sure covering material securely stuck fuselage before stick ing skid material can done Ive using scheme years no problems flying field ground environment particularly harsh frequent tearing fuselage bottom covering occurs try running some auto trim tape stripes along fuselage bottom tape can big help trim looks good too Spectra completeready flyit should weigh somewhere tween 35 39 oz its over 40 youve done something will hurt its flying ability its under 35 please tell did weight range holds versions Spectra six 12 Ah cells Other batteries course can make big difference youve followed plans text have built surfaces warp-free fly ing should both snap pure pleas ure Launch straight out nose pointed little downward take Remember Electrics char acteristically fly wing prop Go easy up-elevator Fly what want horse Have happy quiet time May Electric Elation * * Long Engine Life * * Use BRU LINE Air Cleaner Completely Fuel Proof Nylon Rubber Parts Cat No 102 Air Cleaner Coarse Cat No 202 Air Cleaner Fine Replacement Inserts Cat No 104 Pkl2 Inserts Coarse Cat No 204 PkJ2 Inserts Fine $225 $225 $195 $195 Radio TechniquslMyor Continued page 41 12 miles 10 kHz away inter fere didnt flew transmitter antenna totally collapsed unscrewed test hop showed machine flyable offered friends Santos Font fly Santos very cautious checking machine out complained about insuffi cient forward stick could see Santos moved Elevator trim Full Forward couple quick adjustments snaplinks failed satisfy him took machine back tailgate Ford further vestigation Thats discovered Elevator trim worked opposite stick Hmmm Further investigation revealed Rudder Rudder Trim Col lective Elevator could reversed Invert switch Elevator Trim Collective Trim File away memory banks Change Notice followed standard setup pro cedure Baron 20 blocked Teeter Arm Swash Plate perpen dicular main rotor mast set up links things parallel perpendicular another ap propriate servos energized transmitter both sticks centered Hover Mode trims set Neutral except Throttle Trim High main rotor pitch set 54 degrees Tail Rotor set tip difference 15 inches blades folded parallel settings obtained previous flights Using procedure machine trimmed liking first liftoff Santos tried improve trim discovered problem missed Santos moves Superior very abrupt ly wondered did course flying Baron 20 Santos told set Futaba transmitter Collective Pitch stayed 0 degrees way up half throttle creased rapidly havent figured out set Kraft up way fact done just opposite Col $8995 Shrpping Tex Res 8/o Pre-Built Fuselage Balsa Sheeted Foam Wings Totally Pre-Cut Fiberglass Cowl CJ ENTERPRISES 512 7830489 Rt 2 Box 238 M Pharr Texas 78577 lective pitch angle follow Throttle opening up halfway point fall behind producing less constantrpm situation above Hover setup pro duces much gentler control action think Realistic needs full Left Rudder land annoying other hand machine cant made jump up down way Santos Superior can Take choice possible could go lot technical data now doubt would find teresting KP7CH Mark IV radio works nicely since has op tions takes some concentrated study learn use everything got could use Channel Max module dont regret decision first thought Kraft Mk IV quite departure Airtronics CS-5H Helicopter radio discussed column June 1984 issue Airtronics system came good docu mentation followed book made everything seem simple Though have described Airtronics CS-5H basic Helicopter radio dont Want think unsophis ticated Helicopter radios sophisticated airplane radios have taken seriously Heli copter transmitter must mix Throttle Rudder Throttle/Collective Pitch requires two mixers five control channels ie must control five ser vos minimum Most add Gear Switch used control gyro ON/OFF switch between two levels sensitivity Thus Basic Helicopter Radio will have five user controls six active control channels added bit sophistication gives another thing learn point trying make about Airtronics Helicopter system gives you need leaves out some extras can extend beginners initial learning period instance cant adjust pitch curve electronically cant waste time misadjusting either Airtronics CS-5H has no shortage controls fact will find 39 con132 Model Aviation FITS MOST ENGINES 25 UP SEE YOUR LOCAL HOBBY DEALER IF UNAVAILABLE LOCALLY SEND TO Add 75 shippingMichigan residents add 4% sales tax Bru Line Industries Inc PO Box 3786 Center Line Michigan 48015 responding advertisers mention read about Model Aviation S KY FOX SPORT FLYER Wing Span Wing Area Length Weight Engine Radio SEE YOUR 54 Inches 620 Sq 43 Inches 55 Lbs 4050 4 Channel DEALER RLA MODELS513 859-7839 P 0 BOX 640 WEST CARROLLTON OHIO 45449 Direct Orders Send check money order pay shipping handling Ohio residents add 6% Sales Tax $8995 trols adjustments its transmitter two adjust stick-centering force lacks Collective Pitch Trim Collective Pitch Curve Adjustments have things presetting belicrank angles adjusting ball snaplinks mind system has features other could use Both long long way Basic Airplane Radio four-functions nine controls Kraft systems flight pack feeding Kraft gyro KPR-8FDS receiver five KPS-24 servos delivers 150 mA servos stationary two servos moving freely easily-duplicated condition current drain jumps 550 mA use 5R900 pack gives about two hours operating time operating conditions better some voltage measurements before flight stop flying instant flight pack voltage drops below 48 VDC under load you ask Both Kraft Airtronics transmitter have built-in ESVs Flight Pack both come long cord plugs helicopters Charging Jack purpose assess ing flight pack voltage Use before flight know its little inconvenient carry because nei ther transmitter provides storage packet test cords So make yourself no excuse will undo crash damage Ive done little testing now meters red-lined 48 volts needle drops below point head charger Never mind 44 volts stuff. thats charge exhausted basic continuous drain Helicopter gyro over 150 mA flight time remaining after 47 volts has reached desperately shortI estimate generally less time burn tank fuel Baron 20 tank lasts 10 minutes flight Heli Boy tank lasts 27 minutes could exhaust batteries flight either case after youve lifted off 47 volts speak experience Dont neglect transmitter batteries either Kraft strongly advises stop flying transmitter pack reaches 96 volts judging way system degenerated let run down below point ground tests agree dont like built-in meters alternatives ESVs Ex panded-Scale Voltmeters built-in load resistors available ac cessory market Just sure use some thing Ive asked Which better Synthe sized RF PCM no better case because different things both can used same transmitter fact Ill very surprised Futaba Circus dont add synthe sizer PCM sets next year George M Myers 70 Froehlich Farm Rd Hicksville NY 11801 AirfoilslBrownlee Continued page 42 symmetrical cambered sections RN below million showing smooth stall tendency Large negative pitching moments undesirable higher efficient values CL unless center gravity located behind center pressure wing Otherwise tall will have develop down load trim wing will turn have lift addition aircraft weight added induced drag resulting can substantial five-digit sections devised solve problem retaining same thickness distribution changing equations mean line first three numbers together denote NACA mean line sections variously cam bered DLC 015 times first number second two numbers gether twice distance percent Qf chord point maximum camber last two numbers again thick ness results successful showing very low pitching moments particularly 18-21 07o thickness range Another series 1 middle place 0 devised give theoretical zero pitching moment used sections have reputation violent stalls full scale should tame realm shape basic thickness distri bution four- five-digit sections results minimum pressure maximum velocity air flow 75 1007o back leading edge RN 9 10 million range flow turbulent over about 80-85% surface well below flight RN large fast aircraft objective 6-series sec tions develop basic thickness shapes would move minimum pressure point far back possible provide controlled drop pressure trigger premature transition laminar turbulent flow 6- merely separates sections 1- through 5- 7- 8-series second number denotes minimum pressure point tenths chord basic thickness form third number either following comma wntten subscript denotes extent above below DLC tenths low drag bucket range function thickness will about two 15% three 18% etc notation omit ted basic thicknesses below 12070 subscript ordinates represent later devel opment efforts first number after dash 10 times DLC last two thick ness either whole November1984 133 Engineered tne sport moacler mind