George Myers FL Thchnique Farm Ed Hkksvliie NY 11801 column receiver 444 765432 Servo plugs Sockets receiver Cut negative land receiver PC board Standard battery goes Can piug extra battery receiver damage Myers gives several exam ples increase power servos doubiing battery capacity sketch shows part preferred method requires modifying receivers PC board ABSTRACT Reader letters extra batteries cellu lar telephones spread-spectrum future terpreting battery test results AM/FM interac tions READER LETTERS generally fall few cat egories such Question 1 am retired have eight work ing radios really cant afford discard What should What should have transmitters convened narrow band buy new dualconversion narrow-band receivers particularly important will doing flying public facilities will presume frequency control will mini mal use odd-numbered RC channels will common am preparing column will give places prices updates open invitation manufacturers others send pric es schedules services inclusion Question 2 What radio should buy Some times its phrased Which better manufac turer 1 wont answer because dont need grief Question 3 What went wrong best answer based what tell Question 4 what happened What make subject usually radio interference will make suggestions identify prob able sources describe solutions known Question 5 What frequency management plan should use give latest information have Inci dentally dont expect such plans disappear January 1 1991 expect useful long time Question 6 bad thing happened bought something described tough feel bad think misled cant provide much help product unsatisfactory can tell sample worked described column manufacturer takes money provides warranty service department Youll have talk him/her about prob lem wont take action complaints about un satisfactory merchandise unless think have lied manipulated wrote col umn describes product first place dont product reviews such will describe system illustrate Left Ai Wiiiiams iast Guifhawk Grumman F8F-1 Bearcat dispiayed Cradie Aviation Museum Hempstead NY June 3 1990 year Nassau Fiyers Long isiand Condors bring modeis museum combined dispiay promotes modei aviation aviation history pubiic Right Sperry Aerial Torpedo 1918 powered OX-5 guided gyroscopes same manner German V-i Worid War ii has simiiarities Giant Scaie wouid handful fiy RC due short moment arms tiny tail Repilca Cradie Aviation Museum Mitchell Fieid Hempatead NY Open weekends May through October 34 Model Aviation Large battery goes decoder 44444 point have done battery charger ar ticles expected realize mention column does constitute exhaustive sur vey field may better products available use Question 7 idea column thanks consideration tells two things 1 read column think might have answer 2 might sneaky enough try get homework Tom Sawyer ma neuver feel complimented believe might better work would wonder thats true subject interests may write column stimulated such letters Question 8 Since coming Alaska must stop visit did hospitality magnificent brainteasers Such letters usually ask deceptively simple question op ens door world answers like letters follow Teaser 1 Can plug extra battery unused servo socket get extra power ser vos A-scale model will dam age anything William Zartman Down PA Dear Bill may put extra battery unused servo channel correctly plug battery servo channel won t damage system battery will power whole system usual way won t able shut off power unless first plug extra battery its own switch harness plug harness receiver Im assuming receiver buried some inside plane plugging un plugging second battery would difficult Connecting two batteries directly parallel bad idea Unless both batteries precisely matched charge characteristics level charge stronger battery will charge weaker battery very fast Depending imbal ance charge current may damage lands receivers PC board general shouldnt connect Ni-Cd bat tery packs parallel must use bat tery isolator such Ace RIC 2 x 5 some kind switch dont like idea mechan ical switch because always chance will hang up middle leaving ra dio no battery third better way accomplish purposes modify radio cutting positive PC board will no age connectlon servos regular 500-mAh battery pack will connected usual way will op erate just receiver eight 10 hours per charge Now take l200-mAh battery-and-switch harness plug unused servo recepta cle receiver isolated 500mAh battery wont cross-charg ing minus voltage lands will con nected together will common refer ence control pulses servos power run servos will drawn 1200-mAh battery setup has significant advantage Any noise servo leads such might picked up long aileron servo lead extenders will shunted through l200-mAh battery will have effect receiver Continued page 36 pc PROPELLERS Sound Supression Design High Thrust Efficiency Constant True Pitch Long Fiber Advanced Composite Material Proven Performance US Masters US Nationals Canadian Nationals 1988 World Championships 57x3$159 EACH 7x3$159EAcH 7x4$159EACH 7x5$159EACH 7x6 $159 EACH 7x7$159EACH 7x8SISBEACH 7x8$159EACH 7x10$159EACH 9x4$179EACH 9x5$179EACH 9x6$179EACH 8x7$179EACH 8x8$179EACH 8x9$179EACH nxlo$179EACH 9x4SIBBEACH 9x5SISSEACH Sport SizesCompetition Sizes 9s6$199EACH 9x7$199EACH 9x8SISSEACH 9x9$199EACH 9x10sISSEACH 95 x 45$229 EACH 10x6$22SEACH 10x7$229EACH 10x9$229EACH 10x9$229EACH lOxIC$229EACH lixE$249EACH 11x75249EACH 11x8$249EACH 11x9$249EACH 12x6$2B9EACH 12x7$289 EACH 12x8$2B9EACH lixiC$795EACH lixil S795EACH 11x12 $795EACH 11x13 $795EACH 11x14 $795EACH 12x9 $795EACH 12x10 $795EACH 12x11 $795EACH 12x12 $795EACH 12x13 $795EACH 12x14 $795EACH 11x12W $795EACH l2xlOW $795EACH 135 x 12551295 EACH 14x8 $1295EACH 14x14 $1295EACH Contact local hobby dealer Manufactured Landing Products Knights Landing California October 1990 35 0 S Satisfaction Guaranteed EAAII ISH-710 Pkg 24- 52 95 V THE HIGH-TECH HINGE DESIGNED FOR THE CYANOACRYLATE AGE Easier install other hinge No gouging picking messy epoxies Simply cut single knife slot hinge slide hinges place apply few drops favorite CA glue youre done SUPER FAST SUPER EASY SUPER STRONG 74e ea t9e4 foa Laa SIG MFG co INc.401-7 So Front St.Montezuma IA 50171 23-5154 4 MADE IN USA PHONE ORDERS 504 626-7840 FLYABLE IN ONE HOUR 0 ENGINE 4 CHANNEL 48 WINGSPAN 35 - 45 LBS THE KONflAT 40 - GREAT RIC SPORT AIRPLANE AND WITH SO LITTLE TIME AND MONEY INVESTED YOU CAN REALLY HAVE BALL ITS FULLY AERO8ATIC AND EXTREFIIELY DURABLE CONSTRUCTED OF ALUWU AND RUBBERIZED PLASTIC YOU PROVIDE THE RADIO AND ENGINE WE SUPPLY EVERYTHING ELSE NO EXTRAS TO BUY 25 ENGINE MAKES GREAT ADVANCED TRAINER SPECIAL INTRODUCTORY OFFER 5 POSTPAID LIST $8995 PINEVIEW MANDEVILLE LA 70448 Teaser 2 Sunday fellow came up told soon would safe fly Sepulveda Basin Los Angeles area 53 MHz should switch 50 MHz What talking about MA Fallandy Ca noga Park CA has puzzled know Cal ifornia hams have proposing changes six-meter band would reserve top end hand repeaters changes havent accepted ARRL American Radio Re lay LeagueEd other hand hams have los latitude what can assigned frequencies ARRL never did formally recognize spots 53 MHz have used RC did recognize 50 MHz spots Perhaps some hams LA have decided push RC off band area Can someone enlighten us Teaser 3 Will problem cellular phones showing up cars Cellular phones operate 840-900 MHz band unlikely have effect 72 MHz radios unless some guy walks pit area starts talking toy doing ground range check general shouldnt problem us subject 900 MHz band FCC has approved use digital spread-spectrum modes 902-928 MHz ham band may remember have several occasions re marked spread-spectrum techniques can im prove RC system performance time FCC decision primarily effects use com puters approved communicate via RF links mode What does mean RCers Primarily means people going develop spreadspectrum digital tools techniques may useful us few years concentra tion users 72 MHz band begins bring back interference problems now escaping improved narrow-band radios Dont go crying Theyre setting us up other equipment change march time inexorable Some people predicting population will double year 2000 people will come competition use resources radio spectrum Teaser 4 years Ive under im pression safe fly batteries have recharged recently Now hear need know mAb capacity What real story Lets say receiver battery fully charged After about hour discharged LR Taylor Power Pacer shows mAb reading What lowest reading necessary ensure safe flying Some say 250 some 350 some 450 Whos right LT Wood ard West Palm Beach FL Dear LT fuel tank half full safe fly really same questionand earns same answer Everything depends mission half chargeor half tank fuelwill get through mission enough Charge discharge battery five times re cording results discharge 500mAb battery wont recover least 400 mAh might use flashlight pocket tape re corder would fly would scrap battery rated 500 mAb tested 250 mAh Continued page 153 36 Model Aviation Put Fun Back Fun Fly Geta ROUN TUIT Today Its round sflat flies 30 Flying DISC STOL SUPERIOR Small Field 8 FUN FLY Aircraft STABLE PREDICTABLE 8 AGILE $4795H shipping TX Res add 7% sales tax VISA Foam & Lisa Ply Construc5on ELEVON Mixer Included 25-45 cid 3-35 lbs Accurats QuALITY Materials ONLY Money Back GUARANTEE Business nonded Model Products Box 10996 Suite 543 Austin TX 78766 512 250-1420 512 444-3388 Radio Technique/Myers Continued page 36 Teaser 5 Can AM transmitters fly FM re ceivers vice versa several readers RC systems advertised being AM encode information switching On/Off hence radi ated power changes frequency 72xxx MHz 0 MHz FM systems shift between two frequencies about 5 kHz apart ie 72xxx 72xx5 MHz FM shift harder detect might expect Therefore likely FM receiver will controlled AM trans mitter AM receiver will con trolled FM transmitter Having said can now tell last receiver tested narrow-band AM re ceiver ground range 50 paces AM synthesizer 50 paces FM syn thesizer Kraft multifrequency transmitter Nature AM Lightning strikes corona around high-voltage transmission lines arc weld ers plastic bag sealers ignition systems gas oline engines clattering metal-to-metal parts produce AM-type signals George Steiner tests receivers AM FM sensitivity both on-channel off-channel data shows FM RC receivers actually sensitive off-channel AM transmitters off-channel FM transmitters reason power sidebands narrow-band AM transmitter sidebands narrow-band FM transmitter Whether AM transmitter will/wont fly FM receiver vice versa depends encod ing decoding methods case PCM pulse-code modulationEd receiver onchannel transmissions will put receiver its fail-safe mode because code will wrong case PWM pulse-width modula tionEd receivers may/may con trolled other kind transmitter de pending decoder works whether frame times pulse positions num ber channels match Airtronics 92xxx FM receiver instance completely immune AM transmitters tests Broke It/Berman Continued page 41 balsa mess Examining disaster fig uring quite typical advised new member plane can saved As instructed patiently picked up pieces Just week later jubilantly back field ready next check flight completely recov ered extensively damaged airplane As Navy Captain James Lawrence pleaded after being mortally wounded Boston Har bor 1813 Dont give up ship likely can live fly another lay little patience bottle CyA RC Soaring/Blakeslee Continued page 45 -scale plans workmanship Glider absolutely flawless detail Id have say finest Scale Glider Ive ever seen compared Erics Grunau Baby Baby Bowlus both flew last year Unfortu nately Kranich also too light try Fridayplus fact Eric zero flights Better save another day museum Friday night winc-tasting hors doeuvres social sponsored Charlie Morey editor/publisher Slope Soaring News very nice time talking Gliders al though large crowd made things bit snug must say Washington State vintages very tasty lot interest watching videos shot during day Saturday dawned nary ripple Co lumbia Most pilots hung around hotel waiting word slope would used Eagle Kiona Butte up Benton City mid morning nobody could stand waiting longer everybody took off slope other started Eagle met convoy coming down hill word Kiona later heard some guys stayed Eagle flew us ing winches Kiona big hill has advantage graveled road way up Eagle terribly dusty doesnt have big landing area Eagle breeze very light north however some thermals coming through Bill Liscomb DG 202 specked out arrived about noon what little wind stopped altogether few planes air slope lift petered out pilots tried trick book get high enough land near top hill No luck kept getting smaller smaller finally landed bottom looking like specks landed damage heard later Everyone took advantage lull talk about flying look over others lat est projects special guest speaker Saturday eve ning banquet Michael Selig Michael talked showed slides about Princeton wind tun nel tests John Donovan David Fraser performed August 1986 through Jan uary 1989 results published Herk Stokely Soartech 8 Airfoils Low Speeds course everyone edge seat waiting Seligs Seven Special Se crets designing cant-miss contestwinning Glider Michael obliged going through detailed explanations what feels important points Glider design quick summary 1 Pick good airfoil type flying Glider intended stick Minor vari ations can tried get used 2 wing pylon like Rich Spicers Syn ergy III efficient cut Out fit fuselage 3 Use fully sheeted wings because airfoil truer 4 wing tips half-crescent shape top surface shaped sharp edge like trail ing edge best 5 A small outer wing panel tipped up about 250 good like Falcon 880 6 Use straight trailing edge should also sharp 7 Use springy wing joiner idea joiner act like shock absorber wind gusts have less effect plane will easier fly Thanks Michael great presentation Following Michaels talk huge drawing door prizes Everybody got something Hobby Dynamics donated three JR Max radios Beemer R/C West Multiplex radio Im sure attendees appreciated receiving door Learn pros Top Flite details clear easy-to-follow full-color close up action Wings Fuselage Trims Color-on-color Designs Hinging Basic through advanced heat gun iron usage techniques tape approximately 1 hour MONOKOIIa Basics Wings Tail Sections Fuselages Hinging Color Schemes Trimming MONOXOTE II Advanced Color Schemes Designs Wing Tips Multi-Color Combos MORE MONOKOII 1W Airframe Prep Advanced Wing Tips Hinging Color-on-Color Graphics Painting MORE MONOKO1E Iv Wing Tips Canopy Covering Advanced Graphics Striping Car Bodies MORE MONOKOTE V Detailing Chrome Scale Tips Concave Surfaces Fragile Wing Tips MORE GREAT FOR CLUB MEETINGS RENT OR BUY $3995 $20 Refund per tape Rentals returned undamaged within 30 days Please specify 111111 IV orVwith order SPECIAL PURCHASE ONLY COMBO OFFER Combination 2-hour long tapes Specify & II Ill & IV Only $65 Save $1490 Sorry no rentals available Combo tapes Send check MO Name Full Address choice VHS BETA format TOP FLITE MODEI$ INC Monokote Video Course 2635 S Wabash Ave Chicago IL 60616 October 1990 153
Edition: Model Aviation - 1990/10
Page Numbers: 34, 35, 36, 153
Edition: Model Aviation - 1990/10
Page Numbers: 34, 35, 36, 153
George Myers FL Thchnique Farm Ed Hkksvliie NY 11801 column receiver 444 765432 Servo plugs Sockets receiver Cut negative land receiver PC board Standard battery goes Can piug extra battery receiver damage Myers gives several exam ples increase power servos doubiing battery capacity sketch shows part preferred method requires modifying receivers PC board ABSTRACT Reader letters extra batteries cellu lar telephones spread-spectrum future terpreting battery test results AM/FM interac tions READER LETTERS generally fall few cat egories such Question 1 am retired have eight work ing radios really cant afford discard What should What should have transmitters convened narrow band buy new dualconversion narrow-band receivers particularly important will doing flying public facilities will presume frequency control will mini mal use odd-numbered RC channels will common am preparing column will give places prices updates open invitation manufacturers others send pric es schedules services inclusion Question 2 What radio should buy Some times its phrased Which better manufac turer 1 wont answer because dont need grief Question 3 What went wrong best answer based what tell Question 4 what happened What make subject usually radio interference will make suggestions identify prob able sources describe solutions known Question 5 What frequency management plan should use give latest information have Inci dentally dont expect such plans disappear January 1 1991 expect useful long time Question 6 bad thing happened bought something described tough feel bad think misled cant provide much help product unsatisfactory can tell sample worked described column manufacturer takes money provides warranty service department Youll have talk him/her about prob lem wont take action complaints about un satisfactory merchandise unless think have lied manipulated wrote col umn describes product first place dont product reviews such will describe system illustrate Left Ai Wiiiiams iast Guifhawk Grumman F8F-1 Bearcat dispiayed Cradie Aviation Museum Hempstead NY June 3 1990 year Nassau Fiyers Long isiand Condors bring modeis museum combined dispiay promotes modei aviation aviation history pubiic Right Sperry Aerial Torpedo 1918 powered OX-5 guided gyroscopes same manner German V-i Worid War ii has simiiarities Giant Scaie wouid handful fiy RC due short moment arms tiny tail Repilca Cradie Aviation Museum Mitchell Fieid Hempatead NY Open weekends May through October 34 Model Aviation Large battery goes decoder 44444 point have done battery charger ar ticles expected realize mention column does constitute exhaustive sur vey field may better products available use Question 7 idea column thanks consideration tells two things 1 read column think might have answer 2 might sneaky enough try get homework Tom Sawyer ma neuver feel complimented believe might better work would wonder thats true subject interests may write column stimulated such letters Question 8 Since coming Alaska must stop visit did hospitality magnificent brainteasers Such letters usually ask deceptively simple question op ens door world answers like letters follow Teaser 1 Can plug extra battery unused servo socket get extra power ser vos A-scale model will dam age anything William Zartman Down PA Dear Bill may put extra battery unused servo channel correctly plug battery servo channel won t damage system battery will power whole system usual way won t able shut off power unless first plug extra battery its own switch harness plug harness receiver Im assuming receiver buried some inside plane plugging un plugging second battery would difficult Connecting two batteries directly parallel bad idea Unless both batteries precisely matched charge characteristics level charge stronger battery will charge weaker battery very fast Depending imbal ance charge current may damage lands receivers PC board general shouldnt connect Ni-Cd bat tery packs parallel must use bat tery isolator such Ace RIC 2 x 5 some kind switch dont like idea mechan ical switch because always chance will hang up middle leaving ra dio no battery third better way accomplish purposes modify radio cutting positive PC board will no age connectlon servos regular 500-mAh battery pack will connected usual way will op erate just receiver eight 10 hours per charge Now take l200-mAh battery-and-switch harness plug unused servo recepta cle receiver isolated 500mAh battery wont cross-charg ing minus voltage lands will con nected together will common refer ence control pulses servos power run servos will drawn 1200-mAh battery setup has significant advantage Any noise servo leads such might picked up long aileron servo lead extenders will shunted through l200-mAh battery will have effect receiver Continued page 36 pc PROPELLERS Sound Supression Design High Thrust Efficiency Constant True Pitch Long Fiber Advanced Composite Material Proven Performance US Masters US Nationals Canadian Nationals 1988 World Championships 57x3$159 EACH 7x3$159EAcH 7x4$159EACH 7x5$159EACH 7x6 $159 EACH 7x7$159EACH 7x8SISBEACH 7x8$159EACH 7x10$159EACH 9x4$179EACH 9x5$179EACH 9x6$179EACH 8x7$179EACH 8x8$179EACH 8x9$179EACH nxlo$179EACH 9x4SIBBEACH 9x5SISSEACH Sport SizesCompetition Sizes 9s6$199EACH 9x7$199EACH 9x8SISSEACH 9x9$199EACH 9x10sISSEACH 95 x 45$229 EACH 10x6$22SEACH 10x7$229EACH 10x9$229EACH 10x9$229EACH lOxIC$229EACH lixE$249EACH 11x75249EACH 11x8$249EACH 11x9$249EACH 12x6$2B9EACH 12x7$289 EACH 12x8$2B9EACH lixiC$795EACH lixil S795EACH 11x12 $795EACH 11x13 $795EACH 11x14 $795EACH 12x9 $795EACH 12x10 $795EACH 12x11 $795EACH 12x12 $795EACH 12x13 $795EACH 12x14 $795EACH 11x12W $795EACH l2xlOW $795EACH 135 x 12551295 EACH 14x8 $1295EACH 14x14 $1295EACH Contact local hobby dealer Manufactured Landing Products Knights Landing California October 1990 35 0 S Satisfaction Guaranteed EAAII ISH-710 Pkg 24- 52 95 V THE HIGH-TECH HINGE DESIGNED FOR THE CYANOACRYLATE AGE Easier install other hinge No gouging picking messy epoxies Simply cut single knife slot hinge slide hinges place apply few drops favorite CA glue youre done SUPER FAST SUPER EASY SUPER STRONG 74e ea t9e4 foa Laa SIG MFG co INc.401-7 So Front St.Montezuma IA 50171 23-5154 4 MADE IN USA PHONE ORDERS 504 626-7840 FLYABLE IN ONE HOUR 0 ENGINE 4 CHANNEL 48 WINGSPAN 35 - 45 LBS THE KONflAT 40 - GREAT RIC SPORT AIRPLANE AND WITH SO LITTLE TIME AND MONEY INVESTED YOU CAN REALLY HAVE BALL ITS FULLY AERO8ATIC AND EXTREFIIELY DURABLE CONSTRUCTED OF ALUWU AND RUBBERIZED PLASTIC YOU PROVIDE THE RADIO AND ENGINE WE SUPPLY EVERYTHING ELSE NO EXTRAS TO BUY 25 ENGINE MAKES GREAT ADVANCED TRAINER SPECIAL INTRODUCTORY OFFER 5 POSTPAID LIST $8995 PINEVIEW MANDEVILLE LA 70448 Teaser 2 Sunday fellow came up told soon would safe fly Sepulveda Basin Los Angeles area 53 MHz should switch 50 MHz What talking about MA Fallandy Ca noga Park CA has puzzled know Cal ifornia hams have proposing changes six-meter band would reserve top end hand repeaters changes havent accepted ARRL American Radio Re lay LeagueEd other hand hams have los latitude what can assigned frequencies ARRL never did formally recognize spots 53 MHz have used RC did recognize 50 MHz spots Perhaps some hams LA have decided push RC off band area Can someone enlighten us Teaser 3 Will problem cellular phones showing up cars Cellular phones operate 840-900 MHz band unlikely have effect 72 MHz radios unless some guy walks pit area starts talking toy doing ground range check general shouldnt problem us subject 900 MHz band FCC has approved use digital spread-spectrum modes 902-928 MHz ham band may remember have several occasions re marked spread-spectrum techniques can im prove RC system performance time FCC decision primarily effects use com puters approved communicate via RF links mode What does mean RCers Primarily means people going develop spreadspectrum digital tools techniques may useful us few years concentra tion users 72 MHz band begins bring back interference problems now escaping improved narrow-band radios Dont go crying Theyre setting us up other equipment change march time inexorable Some people predicting population will double year 2000 people will come competition use resources radio spectrum Teaser 4 years Ive under im pression safe fly batteries have recharged recently Now hear need know mAb capacity What real story Lets say receiver battery fully charged After about hour discharged LR Taylor Power Pacer shows mAb reading What lowest reading necessary ensure safe flying Some say 250 some 350 some 450 Whos right LT Wood ard West Palm Beach FL Dear LT fuel tank half full safe fly really same questionand earns same answer Everything depends mission half chargeor half tank fuelwill get through mission enough Charge discharge battery five times re cording results discharge 500mAb battery wont recover least 400 mAh might use flashlight pocket tape re corder would fly would scrap battery rated 500 mAb tested 250 mAh Continued page 153 36 Model Aviation Put Fun Back Fun Fly Geta ROUN TUIT Today Its round sflat flies 30 Flying DISC STOL SUPERIOR Small Field 8 FUN FLY Aircraft STABLE PREDICTABLE 8 AGILE $4795H shipping TX Res add 7% sales tax VISA Foam & Lisa Ply Construc5on ELEVON Mixer Included 25-45 cid 3-35 lbs Accurats QuALITY Materials ONLY Money Back GUARANTEE Business nonded Model Products Box 10996 Suite 543 Austin TX 78766 512 250-1420 512 444-3388 Radio Technique/Myers Continued page 36 Teaser 5 Can AM transmitters fly FM re ceivers vice versa several readers RC systems advertised being AM encode information switching On/Off hence radi ated power changes frequency 72xxx MHz 0 MHz FM systems shift between two frequencies about 5 kHz apart ie 72xxx 72xx5 MHz FM shift harder detect might expect Therefore likely FM receiver will controlled AM trans mitter AM receiver will con trolled FM transmitter Having said can now tell last receiver tested narrow-band AM re ceiver ground range 50 paces AM synthesizer 50 paces FM syn thesizer Kraft multifrequency transmitter Nature AM Lightning strikes corona around high-voltage transmission lines arc weld ers plastic bag sealers ignition systems gas oline engines clattering metal-to-metal parts produce AM-type signals George Steiner tests receivers AM FM sensitivity both on-channel off-channel data shows FM RC receivers actually sensitive off-channel AM transmitters off-channel FM transmitters reason power sidebands narrow-band AM transmitter sidebands narrow-band FM transmitter Whether AM transmitter will/wont fly FM receiver vice versa depends encod ing decoding methods case PCM pulse-code modulationEd receiver onchannel transmissions will put receiver its fail-safe mode because code will wrong case PWM pulse-width modula tionEd receivers may/may con trolled other kind transmitter de pending decoder works whether frame times pulse positions num ber channels match Airtronics 92xxx FM receiver instance completely immune AM transmitters tests Broke It/Berman Continued page 41 balsa mess Examining disaster fig uring quite typical advised new member plane can saved As instructed patiently picked up pieces Just week later jubilantly back field ready next check flight completely recov ered extensively damaged airplane As Navy Captain James Lawrence pleaded after being mortally wounded Boston Har bor 1813 Dont give up ship likely can live fly another lay little patience bottle CyA RC Soaring/Blakeslee Continued page 45 -scale plans workmanship Glider absolutely flawless detail Id have say finest Scale Glider Ive ever seen compared Erics Grunau Baby Baby Bowlus both flew last year Unfortu nately Kranich also too light try Fridayplus fact Eric zero flights Better save another day museum Friday night winc-tasting hors doeuvres social sponsored Charlie Morey editor/publisher Slope Soaring News very nice time talking Gliders al though large crowd made things bit snug must say Washington State vintages very tasty lot interest watching videos shot during day Saturday dawned nary ripple Co lumbia Most pilots hung around hotel waiting word slope would used Eagle Kiona Butte up Benton City mid morning nobody could stand waiting longer everybody took off slope other started Eagle met convoy coming down hill word Kiona later heard some guys stayed Eagle flew us ing winches Kiona big hill has advantage graveled road way up Eagle terribly dusty doesnt have big landing area Eagle breeze very light north however some thermals coming through Bill Liscomb DG 202 specked out arrived about noon what little wind stopped altogether few planes air slope lift petered out pilots tried trick book get high enough land near top hill No luck kept getting smaller smaller finally landed bottom looking like specks landed damage heard later Everyone took advantage lull talk about flying look over others lat est projects special guest speaker Saturday eve ning banquet Michael Selig Michael talked showed slides about Princeton wind tun nel tests John Donovan David Fraser performed August 1986 through Jan uary 1989 results published Herk Stokely Soartech 8 Airfoils Low Speeds course everyone edge seat waiting Seligs Seven Special Se crets designing cant-miss contestwinning Glider Michael obliged going through detailed explanations what feels important points Glider design quick summary 1 Pick good airfoil type flying Glider intended stick Minor vari ations can tried get used 2 wing pylon like Rich Spicers Syn ergy III efficient cut Out fit fuselage 3 Use fully sheeted wings because airfoil truer 4 wing tips half-crescent shape top surface shaped sharp edge like trail ing edge best 5 A small outer wing panel tipped up about 250 good like Falcon 880 6 Use straight trailing edge should also sharp 7 Use springy wing joiner idea joiner act like shock absorber wind gusts have less effect plane will easier fly Thanks Michael great presentation Following Michaels talk huge drawing door prizes Everybody got something Hobby Dynamics donated three JR Max radios Beemer R/C West Multiplex radio Im sure attendees appreciated receiving door Learn pros Top Flite details clear easy-to-follow full-color close up action Wings Fuselage Trims Color-on-color Designs Hinging Basic through advanced heat gun iron usage techniques tape approximately 1 hour MONOKOIIa Basics Wings Tail Sections Fuselages Hinging Color Schemes Trimming MONOXOTE II Advanced Color Schemes Designs Wing Tips Multi-Color Combos MORE MONOKOII 1W Airframe Prep Advanced Wing Tips Hinging Color-on-Color Graphics Painting MORE MONOKO1E Iv Wing Tips Canopy Covering Advanced Graphics Striping Car Bodies MORE MONOKOTE V Detailing Chrome Scale Tips Concave Surfaces Fragile Wing Tips MORE GREAT FOR CLUB MEETINGS RENT OR BUY $3995 $20 Refund per tape Rentals returned undamaged within 30 days Please specify 111111 IV orVwith order SPECIAL PURCHASE ONLY COMBO OFFER Combination 2-hour long tapes Specify & II Ill & IV Only $65 Save $1490 Sorry no rentals available Combo tapes Send check MO Name Full Address choice VHS BETA format TOP FLITE MODEI$ INC Monokote Video Course 2635 S Wabash Ave Chicago IL 60616 October 1990 153
Edition: Model Aviation - 1990/10
Page Numbers: 34, 35, 36, 153
George Myers FL Thchnique Farm Ed Hkksvliie NY 11801 column receiver 444 765432 Servo plugs Sockets receiver Cut negative land receiver PC board Standard battery goes Can piug extra battery receiver damage Myers gives several exam ples increase power servos doubiing battery capacity sketch shows part preferred method requires modifying receivers PC board ABSTRACT Reader letters extra batteries cellu lar telephones spread-spectrum future terpreting battery test results AM/FM interac tions READER LETTERS generally fall few cat egories such Question 1 am retired have eight work ing radios really cant afford discard What should What should have transmitters convened narrow band buy new dualconversion narrow-band receivers particularly important will doing flying public facilities will presume frequency control will mini mal use odd-numbered RC channels will common am preparing column will give places prices updates open invitation manufacturers others send pric es schedules services inclusion Question 2 What radio should buy Some times its phrased Which better manufac turer 1 wont answer because dont need grief Question 3 What went wrong best answer based what tell Question 4 what happened What make subject usually radio interference will make suggestions identify prob able sources describe solutions known Question 5 What frequency management plan should use give latest information have Inci dentally dont expect such plans disappear January 1 1991 expect useful long time Question 6 bad thing happened bought something described tough feel bad think misled cant provide much help product unsatisfactory can tell sample worked described column manufacturer takes money provides warranty service department Youll have talk him/her about prob lem wont take action complaints about un satisfactory merchandise unless think have lied manipulated wrote col umn describes product first place dont product reviews such will describe system illustrate Left Ai Wiiiiams iast Guifhawk Grumman F8F-1 Bearcat dispiayed Cradie Aviation Museum Hempstead NY June 3 1990 year Nassau Fiyers Long isiand Condors bring modeis museum combined dispiay promotes modei aviation aviation history pubiic Right Sperry Aerial Torpedo 1918 powered OX-5 guided gyroscopes same manner German V-i Worid War ii has simiiarities Giant Scaie wouid handful fiy RC due short moment arms tiny tail Repilca Cradie Aviation Museum Mitchell Fieid Hempatead NY Open weekends May through October 34 Model Aviation Large battery goes decoder 44444 point have done battery charger ar ticles expected realize mention column does constitute exhaustive sur vey field may better products available use Question 7 idea column thanks consideration tells two things 1 read column think might have answer 2 might sneaky enough try get homework Tom Sawyer ma neuver feel complimented believe might better work would wonder thats true subject interests may write column stimulated such letters Question 8 Since coming Alaska must stop visit did hospitality magnificent brainteasers Such letters usually ask deceptively simple question op ens door world answers like letters follow Teaser 1 Can plug extra battery unused servo socket get extra power ser vos A-scale model will dam age anything William Zartman Down PA Dear Bill may put extra battery unused servo channel correctly plug battery servo channel won t damage system battery will power whole system usual way won t able shut off power unless first plug extra battery its own switch harness plug harness receiver Im assuming receiver buried some inside plane plugging un plugging second battery would difficult Connecting two batteries directly parallel bad idea Unless both batteries precisely matched charge characteristics level charge stronger battery will charge weaker battery very fast Depending imbal ance charge current may damage lands receivers PC board general shouldnt connect Ni-Cd bat tery packs parallel must use bat tery isolator such Ace RIC 2 x 5 some kind switch dont like idea mechan ical switch because always chance will hang up middle leaving ra dio no battery third better way accomplish purposes modify radio cutting positive PC board will no age connectlon servos regular 500-mAh battery pack will connected usual way will op erate just receiver eight 10 hours per charge Now take l200-mAh battery-and-switch harness plug unused servo recepta cle receiver isolated 500mAh battery wont cross-charg ing minus voltage lands will con nected together will common refer ence control pulses servos power run servos will drawn 1200-mAh battery setup has significant advantage Any noise servo leads such might picked up long aileron servo lead extenders will shunted through l200-mAh battery will have effect receiver Continued page 36 pc PROPELLERS Sound Supression Design High Thrust Efficiency Constant True Pitch Long Fiber Advanced Composite Material Proven Performance US Masters US Nationals Canadian Nationals 1988 World Championships 57x3$159 EACH 7x3$159EAcH 7x4$159EACH 7x5$159EACH 7x6 $159 EACH 7x7$159EACH 7x8SISBEACH 7x8$159EACH 7x10$159EACH 9x4$179EACH 9x5$179EACH 9x6$179EACH 8x7$179EACH 8x8$179EACH 8x9$179EACH nxlo$179EACH 9x4SIBBEACH 9x5SISSEACH Sport SizesCompetition Sizes 9s6$199EACH 9x7$199EACH 9x8SISSEACH 9x9$199EACH 9x10sISSEACH 95 x 45$229 EACH 10x6$22SEACH 10x7$229EACH 10x9$229EACH 10x9$229EACH lOxIC$229EACH lixE$249EACH 11x75249EACH 11x8$249EACH 11x9$249EACH 12x6$2B9EACH 12x7$289 EACH 12x8$2B9EACH lixiC$795EACH lixil S795EACH 11x12 $795EACH 11x13 $795EACH 11x14 $795EACH 12x9 $795EACH 12x10 $795EACH 12x11 $795EACH 12x12 $795EACH 12x13 $795EACH 12x14 $795EACH 11x12W $795EACH l2xlOW $795EACH 135 x 12551295 EACH 14x8 $1295EACH 14x14 $1295EACH Contact local hobby dealer Manufactured Landing Products Knights Landing California October 1990 35 0 S Satisfaction Guaranteed EAAII ISH-710 Pkg 24- 52 95 V THE HIGH-TECH HINGE DESIGNED FOR THE CYANOACRYLATE AGE Easier install other hinge No gouging picking messy epoxies Simply cut single knife slot hinge slide hinges place apply few drops favorite CA glue youre done SUPER FAST SUPER EASY SUPER STRONG 74e ea t9e4 foa Laa SIG MFG co INc.401-7 So Front St.Montezuma IA 50171 23-5154 4 MADE IN USA PHONE ORDERS 504 626-7840 FLYABLE IN ONE HOUR 0 ENGINE 4 CHANNEL 48 WINGSPAN 35 - 45 LBS THE KONflAT 40 - GREAT RIC SPORT AIRPLANE AND WITH SO LITTLE TIME AND MONEY INVESTED YOU CAN REALLY HAVE BALL ITS FULLY AERO8ATIC AND EXTREFIIELY DURABLE CONSTRUCTED OF ALUWU AND RUBBERIZED PLASTIC YOU PROVIDE THE RADIO AND ENGINE WE SUPPLY EVERYTHING ELSE NO EXTRAS TO BUY 25 ENGINE MAKES GREAT ADVANCED TRAINER SPECIAL INTRODUCTORY OFFER 5 POSTPAID LIST $8995 PINEVIEW MANDEVILLE LA 70448 Teaser 2 Sunday fellow came up told soon would safe fly Sepulveda Basin Los Angeles area 53 MHz should switch 50 MHz What talking about MA Fallandy Ca noga Park CA has puzzled know Cal ifornia hams have proposing changes six-meter band would reserve top end hand repeaters changes havent accepted ARRL American Radio Re lay LeagueEd other hand hams have los latitude what can assigned frequencies ARRL never did formally recognize spots 53 MHz have used RC did recognize 50 MHz spots Perhaps some hams LA have decided push RC off band area Can someone enlighten us Teaser 3 Will problem cellular phones showing up cars Cellular phones operate 840-900 MHz band unlikely have effect 72 MHz radios unless some guy walks pit area starts talking toy doing ground range check general shouldnt problem us subject 900 MHz band FCC has approved use digital spread-spectrum modes 902-928 MHz ham band may remember have several occasions re marked spread-spectrum techniques can im prove RC system performance time FCC decision primarily effects use com puters approved communicate via RF links mode What does mean RCers Primarily means people going develop spreadspectrum digital tools techniques may useful us few years concentra tion users 72 MHz band begins bring back interference problems now escaping improved narrow-band radios Dont go crying Theyre setting us up other equipment change march time inexorable Some people predicting population will double year 2000 people will come competition use resources radio spectrum Teaser 4 years Ive under im pression safe fly batteries have recharged recently Now hear need know mAb capacity What real story Lets say receiver battery fully charged After about hour discharged LR Taylor Power Pacer shows mAb reading What lowest reading necessary ensure safe flying Some say 250 some 350 some 450 Whos right LT Wood ard West Palm Beach FL Dear LT fuel tank half full safe fly really same questionand earns same answer Everything depends mission half chargeor half tank fuelwill get through mission enough Charge discharge battery five times re cording results discharge 500mAb battery wont recover least 400 mAh might use flashlight pocket tape re corder would fly would scrap battery rated 500 mAb tested 250 mAh Continued page 153 36 Model Aviation Put Fun Back Fun Fly Geta ROUN TUIT Today Its round sflat flies 30 Flying DISC STOL SUPERIOR Small Field 8 FUN FLY Aircraft STABLE PREDICTABLE 8 AGILE $4795H shipping TX Res add 7% sales tax VISA Foam & Lisa Ply Construc5on ELEVON Mixer Included 25-45 cid 3-35 lbs Accurats QuALITY Materials ONLY Money Back GUARANTEE Business nonded Model Products Box 10996 Suite 543 Austin TX 78766 512 250-1420 512 444-3388 Radio Technique/Myers Continued page 36 Teaser 5 Can AM transmitters fly FM re ceivers vice versa several readers RC systems advertised being AM encode information switching On/Off hence radi ated power changes frequency 72xxx MHz 0 MHz FM systems shift between two frequencies about 5 kHz apart ie 72xxx 72xx5 MHz FM shift harder detect might expect Therefore likely FM receiver will controlled AM trans mitter AM receiver will con trolled FM transmitter Having said can now tell last receiver tested narrow-band AM re ceiver ground range 50 paces AM synthesizer 50 paces FM syn thesizer Kraft multifrequency transmitter Nature AM Lightning strikes corona around high-voltage transmission lines arc weld ers plastic bag sealers ignition systems gas oline engines clattering metal-to-metal parts produce AM-type signals George Steiner tests receivers AM FM sensitivity both on-channel off-channel data shows FM RC receivers actually sensitive off-channel AM transmitters off-channel FM transmitters reason power sidebands narrow-band AM transmitter sidebands narrow-band FM transmitter Whether AM transmitter will/wont fly FM receiver vice versa depends encod ing decoding methods case PCM pulse-code modulationEd receiver onchannel transmissions will put receiver its fail-safe mode because code will wrong case PWM pulse-width modula tionEd receivers may/may con trolled other kind transmitter de pending decoder works whether frame times pulse positions num ber channels match Airtronics 92xxx FM receiver instance completely immune AM transmitters tests Broke It/Berman Continued page 41 balsa mess Examining disaster fig uring quite typical advised new member plane can saved As instructed patiently picked up pieces Just week later jubilantly back field ready next check flight completely recov ered extensively damaged airplane As Navy Captain James Lawrence pleaded after being mortally wounded Boston Har bor 1813 Dont give up ship likely can live fly another lay little patience bottle CyA RC Soaring/Blakeslee Continued page 45 -scale plans workmanship Glider absolutely flawless detail Id have say finest Scale Glider Ive ever seen compared Erics Grunau Baby Baby Bowlus both flew last year Unfortu nately Kranich also too light try Fridayplus fact Eric zero flights Better save another day museum Friday night winc-tasting hors doeuvres social sponsored Charlie Morey editor/publisher Slope Soaring News very nice time talking Gliders al though large crowd made things bit snug must say Washington State vintages very tasty lot interest watching videos shot during day Saturday dawned nary ripple Co lumbia Most pilots hung around hotel waiting word slope would used Eagle Kiona Butte up Benton City mid morning nobody could stand waiting longer everybody took off slope other started Eagle met convoy coming down hill word Kiona later heard some guys stayed Eagle flew us ing winches Kiona big hill has advantage graveled road way up Eagle terribly dusty doesnt have big landing area Eagle breeze very light north however some thermals coming through Bill Liscomb DG 202 specked out arrived about noon what little wind stopped altogether few planes air slope lift petered out pilots tried trick book get high enough land near top hill No luck kept getting smaller smaller finally landed bottom looking like specks landed damage heard later Everyone took advantage lull talk about flying look over others lat est projects special guest speaker Saturday eve ning banquet Michael Selig Michael talked showed slides about Princeton wind tun nel tests John Donovan David Fraser performed August 1986 through Jan uary 1989 results published Herk Stokely Soartech 8 Airfoils Low Speeds course everyone edge seat waiting Seligs Seven Special Se crets designing cant-miss contestwinning Glider Michael obliged going through detailed explanations what feels important points Glider design quick summary 1 Pick good airfoil type flying Glider intended stick Minor vari ations can tried get used 2 wing pylon like Rich Spicers Syn ergy III efficient cut Out fit fuselage 3 Use fully sheeted wings because airfoil truer 4 wing tips half-crescent shape top surface shaped sharp edge like trail ing edge best 5 A small outer wing panel tipped up about 250 good like Falcon 880 6 Use straight trailing edge should also sharp 7 Use springy wing joiner idea joiner act like shock absorber wind gusts have less effect plane will easier fly Thanks Michael great presentation Following Michaels talk huge drawing door prizes Everybody got something Hobby Dynamics donated three JR Max radios Beemer R/C West Multiplex radio Im sure attendees appreciated receiving door Learn pros Top Flite details clear easy-to-follow full-color close up action Wings Fuselage Trims Color-on-color Designs Hinging Basic through advanced heat gun iron usage techniques tape approximately 1 hour MONOKOIIa Basics Wings Tail Sections Fuselages Hinging Color Schemes Trimming MONOXOTE II Advanced Color Schemes Designs Wing Tips Multi-Color Combos MORE MONOKOII 1W Airframe Prep Advanced Wing Tips Hinging Color-on-Color Graphics Painting MORE MONOKO1E Iv Wing Tips Canopy Covering Advanced Graphics Striping Car Bodies MORE MONOKOTE V Detailing Chrome Scale Tips Concave Surfaces Fragile Wing Tips MORE GREAT FOR CLUB MEETINGS RENT OR BUY $3995 $20 Refund per tape Rentals returned undamaged within 30 days Please specify 111111 IV orVwith order SPECIAL PURCHASE ONLY COMBO OFFER Combination 2-hour long tapes Specify & II Ill & IV Only $65 Save $1490 Sorry no rentals available Combo tapes Send check MO Name Full Address choice VHS BETA format TOP FLITE MODEI$ INC Monokote Video Course 2635 S Wabash Ave Chicago IL 60616 October 1990 153
Edition: Model Aviation - 1990/10
Page Numbers: 34, 35, 36, 153
George Myers FL Thchnique Farm Ed Hkksvliie NY 11801 column receiver 444 765432 Servo plugs Sockets receiver Cut negative land receiver PC board Standard battery goes Can piug extra battery receiver damage Myers gives several exam ples increase power servos doubiing battery capacity sketch shows part preferred method requires modifying receivers PC board ABSTRACT Reader letters extra batteries cellu lar telephones spread-spectrum future terpreting battery test results AM/FM interac tions READER LETTERS generally fall few cat egories such Question 1 am retired have eight work ing radios really cant afford discard What should What should have transmitters convened narrow band buy new dualconversion narrow-band receivers particularly important will doing flying public facilities will presume frequency control will mini mal use odd-numbered RC channels will common am preparing column will give places prices updates open invitation manufacturers others send pric es schedules services inclusion Question 2 What radio should buy Some times its phrased Which better manufac turer 1 wont answer because dont need grief Question 3 What went wrong best answer based what tell Question 4 what happened What make subject usually radio interference will make suggestions identify prob able sources describe solutions known Question 5 What frequency management plan should use give latest information have Inci dentally dont expect such plans disappear January 1 1991 expect useful long time Question 6 bad thing happened bought something described tough feel bad think misled cant provide much help product unsatisfactory can tell sample worked described column manufacturer takes money provides warranty service department Youll have talk him/her about prob lem wont take action complaints about un satisfactory merchandise unless think have lied manipulated wrote col umn describes product first place dont product reviews such will describe system illustrate Left Ai Wiiiiams iast Guifhawk Grumman F8F-1 Bearcat dispiayed Cradie Aviation Museum Hempstead NY June 3 1990 year Nassau Fiyers Long isiand Condors bring modeis museum combined dispiay promotes modei aviation aviation history pubiic Right Sperry Aerial Torpedo 1918 powered OX-5 guided gyroscopes same manner German V-i Worid War ii has simiiarities Giant Scaie wouid handful fiy RC due short moment arms tiny tail Repilca Cradie Aviation Museum Mitchell Fieid Hempatead NY Open weekends May through October 34 Model Aviation Large battery goes decoder 44444 point have done battery charger ar ticles expected realize mention column does constitute exhaustive sur vey field may better products available use Question 7 idea column thanks consideration tells two things 1 read column think might have answer 2 might sneaky enough try get homework Tom Sawyer ma neuver feel complimented believe might better work would wonder thats true subject interests may write column stimulated such letters Question 8 Since coming Alaska must stop visit did hospitality magnificent brainteasers Such letters usually ask deceptively simple question op ens door world answers like letters follow Teaser 1 Can plug extra battery unused servo socket get extra power ser vos A-scale model will dam age anything William Zartman Down PA Dear Bill may put extra battery unused servo channel correctly plug battery servo channel won t damage system battery will power whole system usual way won t able shut off power unless first plug extra battery its own switch harness plug harness receiver Im assuming receiver buried some inside plane plugging un plugging second battery would difficult Connecting two batteries directly parallel bad idea Unless both batteries precisely matched charge characteristics level charge stronger battery will charge weaker battery very fast Depending imbal ance charge current may damage lands receivers PC board general shouldnt connect Ni-Cd bat tery packs parallel must use bat tery isolator such Ace RIC 2 x 5 some kind switch dont like idea mechan ical switch because always chance will hang up middle leaving ra dio no battery third better way accomplish purposes modify radio cutting positive PC board will no age connectlon servos regular 500-mAh battery pack will connected usual way will op erate just receiver eight 10 hours per charge Now take l200-mAh battery-and-switch harness plug unused servo recepta cle receiver isolated 500mAh battery wont cross-charg ing minus voltage lands will con nected together will common refer ence control pulses servos power run servos will drawn 1200-mAh battery setup has significant advantage Any noise servo leads such might picked up long aileron servo lead extenders will shunted through l200-mAh battery will have effect receiver Continued page 36 pc PROPELLERS Sound Supression Design High Thrust Efficiency Constant True Pitch Long Fiber Advanced Composite Material Proven Performance US Masters US Nationals Canadian Nationals 1988 World Championships 57x3$159 EACH 7x3$159EAcH 7x4$159EACH 7x5$159EACH 7x6 $159 EACH 7x7$159EACH 7x8SISBEACH 7x8$159EACH 7x10$159EACH 9x4$179EACH 9x5$179EACH 9x6$179EACH 8x7$179EACH 8x8$179EACH 8x9$179EACH nxlo$179EACH 9x4SIBBEACH 9x5SISSEACH Sport SizesCompetition Sizes 9s6$199EACH 9x7$199EACH 9x8SISSEACH 9x9$199EACH 9x10sISSEACH 95 x 45$229 EACH 10x6$22SEACH 10x7$229EACH 10x9$229EACH 10x9$229EACH lOxIC$229EACH lixE$249EACH 11x75249EACH 11x8$249EACH 11x9$249EACH 12x6$2B9EACH 12x7$289 EACH 12x8$2B9EACH lixiC$795EACH lixil S795EACH 11x12 $795EACH 11x13 $795EACH 11x14 $795EACH 12x9 $795EACH 12x10 $795EACH 12x11 $795EACH 12x12 $795EACH 12x13 $795EACH 12x14 $795EACH 11x12W $795EACH l2xlOW $795EACH 135 x 12551295 EACH 14x8 $1295EACH 14x14 $1295EACH Contact local hobby dealer Manufactured Landing Products Knights Landing California October 1990 35 0 S Satisfaction Guaranteed EAAII ISH-710 Pkg 24- 52 95 V THE HIGH-TECH HINGE DESIGNED FOR THE CYANOACRYLATE AGE Easier install other hinge No gouging picking messy epoxies Simply cut single knife slot hinge slide hinges place apply few drops favorite CA glue youre done SUPER FAST SUPER EASY SUPER STRONG 74e ea t9e4 foa Laa SIG MFG co INc.401-7 So Front St.Montezuma IA 50171 23-5154 4 MADE IN USA PHONE ORDERS 504 626-7840 FLYABLE IN ONE HOUR 0 ENGINE 4 CHANNEL 48 WINGSPAN 35 - 45 LBS THE KONflAT 40 - GREAT RIC SPORT AIRPLANE AND WITH SO LITTLE TIME AND MONEY INVESTED YOU CAN REALLY HAVE BALL ITS FULLY AERO8ATIC AND EXTREFIIELY DURABLE CONSTRUCTED OF ALUWU AND RUBBERIZED PLASTIC YOU PROVIDE THE RADIO AND ENGINE WE SUPPLY EVERYTHING ELSE NO EXTRAS TO BUY 25 ENGINE MAKES GREAT ADVANCED TRAINER SPECIAL INTRODUCTORY OFFER 5 POSTPAID LIST $8995 PINEVIEW MANDEVILLE LA 70448 Teaser 2 Sunday fellow came up told soon would safe fly Sepulveda Basin Los Angeles area 53 MHz should switch 50 MHz What talking about MA Fallandy Ca noga Park CA has puzzled know Cal ifornia hams have proposing changes six-meter band would reserve top end hand repeaters changes havent accepted ARRL American Radio Re lay LeagueEd other hand hams have los latitude what can assigned frequencies ARRL never did formally recognize spots 53 MHz have used RC did recognize 50 MHz spots Perhaps some hams LA have decided push RC off band area Can someone enlighten us Teaser 3 Will problem cellular phones showing up cars Cellular phones operate 840-900 MHz band unlikely have effect 72 MHz radios unless some guy walks pit area starts talking toy doing ground range check general shouldnt problem us subject 900 MHz band FCC has approved use digital spread-spectrum modes 902-928 MHz ham band may remember have several occasions re marked spread-spectrum techniques can im prove RC system performance time FCC decision primarily effects use com puters approved communicate via RF links mode What does mean RCers Primarily means people going develop spreadspectrum digital tools techniques may useful us few years concentra tion users 72 MHz band begins bring back interference problems now escaping improved narrow-band radios Dont go crying Theyre setting us up other equipment change march time inexorable Some people predicting population will double year 2000 people will come competition use resources radio spectrum Teaser 4 years Ive under im pression safe fly batteries have recharged recently Now hear need know mAb capacity What real story Lets say receiver battery fully charged After about hour discharged LR Taylor Power Pacer shows mAb reading What lowest reading necessary ensure safe flying Some say 250 some 350 some 450 Whos right LT Wood ard West Palm Beach FL Dear LT fuel tank half full safe fly really same questionand earns same answer Everything depends mission half chargeor half tank fuelwill get through mission enough Charge discharge battery five times re cording results discharge 500mAb battery wont recover least 400 mAh might use flashlight pocket tape re corder would fly would scrap battery rated 500 mAb tested 250 mAh Continued page 153 36 Model Aviation Put Fun Back Fun Fly Geta ROUN TUIT Today Its round sflat flies 30 Flying DISC STOL SUPERIOR Small Field 8 FUN FLY Aircraft STABLE PREDICTABLE 8 AGILE $4795H shipping TX Res add 7% sales tax VISA Foam & Lisa Ply Construc5on ELEVON Mixer Included 25-45 cid 3-35 lbs Accurats QuALITY Materials ONLY Money Back GUARANTEE Business nonded Model Products Box 10996 Suite 543 Austin TX 78766 512 250-1420 512 444-3388 Radio Technique/Myers Continued page 36 Teaser 5 Can AM transmitters fly FM re ceivers vice versa several readers RC systems advertised being AM encode information switching On/Off hence radi ated power changes frequency 72xxx MHz 0 MHz FM systems shift between two frequencies about 5 kHz apart ie 72xxx 72xx5 MHz FM shift harder detect might expect Therefore likely FM receiver will controlled AM trans mitter AM receiver will con trolled FM transmitter Having said can now tell last receiver tested narrow-band AM re ceiver ground range 50 paces AM synthesizer 50 paces FM syn thesizer Kraft multifrequency transmitter Nature AM Lightning strikes corona around high-voltage transmission lines arc weld ers plastic bag sealers ignition systems gas oline engines clattering metal-to-metal parts produce AM-type signals George Steiner tests receivers AM FM sensitivity both on-channel off-channel data shows FM RC receivers actually sensitive off-channel AM transmitters off-channel FM transmitters reason power sidebands narrow-band AM transmitter sidebands narrow-band FM transmitter Whether AM transmitter will/wont fly FM receiver vice versa depends encod ing decoding methods case PCM pulse-code modulationEd receiver onchannel transmissions will put receiver its fail-safe mode because code will wrong case PWM pulse-width modula tionEd receivers may/may con trolled other kind transmitter de pending decoder works whether frame times pulse positions num ber channels match Airtronics 92xxx FM receiver instance completely immune AM transmitters tests Broke It/Berman Continued page 41 balsa mess Examining disaster fig uring quite typical advised new member plane can saved As instructed patiently picked up pieces Just week later jubilantly back field ready next check flight completely recov ered extensively damaged airplane As Navy Captain James Lawrence pleaded after being mortally wounded Boston Har bor 1813 Dont give up ship likely can live fly another lay little patience bottle CyA RC Soaring/Blakeslee Continued page 45 -scale plans workmanship Glider absolutely flawless detail Id have say finest Scale Glider Ive ever seen compared Erics Grunau Baby Baby Bowlus both flew last year Unfortu nately Kranich also too light try Fridayplus fact Eric zero flights Better save another day museum Friday night winc-tasting hors doeuvres social sponsored Charlie Morey editor/publisher Slope Soaring News very nice time talking Gliders al though large crowd made things bit snug must say Washington State vintages very tasty lot interest watching videos shot during day Saturday dawned nary ripple Co lumbia Most pilots hung around hotel waiting word slope would used Eagle Kiona Butte up Benton City mid morning nobody could stand waiting longer everybody took off slope other started Eagle met convoy coming down hill word Kiona later heard some guys stayed Eagle flew us ing winches Kiona big hill has advantage graveled road way up Eagle terribly dusty doesnt have big landing area Eagle breeze very light north however some thermals coming through Bill Liscomb DG 202 specked out arrived about noon what little wind stopped altogether few planes air slope lift petered out pilots tried trick book get high enough land near top hill No luck kept getting smaller smaller finally landed bottom looking like specks landed damage heard later Everyone took advantage lull talk about flying look over others lat est projects special guest speaker Saturday eve ning banquet Michael Selig Michael talked showed slides about Princeton wind tun nel tests John Donovan David Fraser performed August 1986 through Jan uary 1989 results published Herk Stokely Soartech 8 Airfoils Low Speeds course everyone edge seat waiting Seligs Seven Special Se crets designing cant-miss contestwinning Glider Michael obliged going through detailed explanations what feels important points Glider design quick summary 1 Pick good airfoil type flying Glider intended stick Minor vari ations can tried get used 2 wing pylon like Rich Spicers Syn ergy III efficient cut Out fit fuselage 3 Use fully sheeted wings because airfoil truer 4 wing tips half-crescent shape top surface shaped sharp edge like trail ing edge best 5 A small outer wing panel tipped up about 250 good like Falcon 880 6 Use straight trailing edge should also sharp 7 Use springy wing joiner idea joiner act like shock absorber wind gusts have less effect plane will easier fly Thanks Michael great presentation Following Michaels talk huge drawing door prizes Everybody got something Hobby Dynamics donated three JR Max radios Beemer R/C West Multiplex radio Im sure attendees appreciated receiving door Learn pros Top Flite details clear easy-to-follow full-color close up action Wings Fuselage Trims Color-on-color Designs Hinging Basic through advanced heat gun iron usage techniques tape approximately 1 hour MONOKOIIa Basics Wings Tail Sections Fuselages Hinging Color Schemes Trimming MONOXOTE II Advanced Color Schemes Designs Wing Tips Multi-Color Combos MORE MONOKOII 1W Airframe Prep Advanced Wing Tips Hinging Color-on-Color Graphics Painting MORE MONOKO1E Iv Wing Tips Canopy Covering Advanced Graphics Striping Car Bodies MORE MONOKOTE V Detailing Chrome Scale Tips Concave Surfaces Fragile Wing Tips MORE GREAT FOR CLUB MEETINGS RENT OR BUY $3995 $20 Refund per tape Rentals returned undamaged within 30 days Please specify 111111 IV orVwith order SPECIAL PURCHASE ONLY COMBO OFFER Combination 2-hour long tapes Specify & II Ill & IV Only $65 Save $1490 Sorry no rentals available Combo tapes Send check MO Name Full Address choice VHS BETA format TOP FLITE MODEI$ INC Monokote Video Course 2635 S Wabash Ave Chicago IL 60616 October 1990 153
