eorgeMMyer _____________________ Radio Technipue THE REDUNDANT RADIO SYSTEM Back July 1985 issue wrote little bit about possible improvement interference resistance through use parallel redundant RC systems Id like see redundant radio systems Scale model particularly Giant Scale model routine matterjust added safety will provide Show Team model should carry isnt new idea because Good brothers used parallel RC channels control earliest RC systems Simultaneous use several RC channels dropped out favor single-channel RC became quite reliable available number channels very small RC population grew users RC adjacent channels became much numerous Interference became problem expected given 50 channels 72 73 MHz band RC aircraft People asked channels cant fly 50 planes time Usually people doing asking have never tried fly 50 airplanes time really wouldnt know whats possible what isnt would may people now realize really dont have 50 channels because technical properties radios limit us 17 channels time proposed put some unused channels work parallel redundant control channels based know ledge better receivers coming Along came IMS show showed up Calvin Orr Custom Electronics PO Box 1332 Alta Loma CA 91701 sells redundant radio system Kraft KPT7C Futaba 7FGK transmitters As shown photo Calvin using 72 MHz channel six-meter 50 53 MHz channel Amateur license required implementation T-shaped module plugs transmitter accepts two other mod ules BOTH OF WHICH RADIATE AT THE SAME TIME FROM THE ONE ANTENNA proviso both modules must use same modulation both AM both FM brochure passed out IMS show January 1986 held California Calvin traced evolution Redundant Radio System follows Stage 1 transmitter two airborne packs System flies left side airplane engine cutoff System B flies right side throttle Eloy Marez complete description experiments type system about five years ago ACM Stage 2 Two complete RC systems modi fied buddy-box cable permits control signals transmitter sent through transmitter ZIIIIZ ECEIVER w _ B well Two airborne systems Stage 1 Transmitter B sits ground pilot flies transmitter Stage 3 transmitter equipped frequency combiner radiating same com mands two RC channels simultaneously Two airborne systems Stage 1 Stage 4 Same Stage 3 error switch added output receivers B two receivers airplane receive same control signals albeit different radio frequencies decode An error switch samples outputs event inter ference loss signal frequencies error switch ignores output receiver routes control pulses other receiver servos mind intelligent way RC system act deep Radio Technique bow Calvin discussing Stage 4 Redundant Radio System Calvin asked two 72 MHz RC modules could used transmitter T per original intention use 72 MHz channels answer units Im selling right now because cost necessary isolators would cost another transmitter Therefore want use two 72 MHz frequencies should use Stage 2 system two transmitters modified buddy box cable Error Switch have Error Switch order Bob Aberle will performing some tests using Stage 2-4 system will reported later column AB RECEIVER B II II Schematic diagram Stage 4 Redundant Radio System Author George Myers devotes iot months coiumn discussing LEFT ELEVRIGHT ELEV ERRORI SERVOSLEFT AlLRIGHT AlL SW IT OHRUDDERENGINE 40 Model Aviation Swap crystalsor electronics De cember 20 1987 just around corner have procrastinated about shifting old radio new frequencies advised / Redundant Radio System T-moduie Kraft KPT7C transmitter units iegs resting transmitter can cut off necessary make ciearance knobs switches transmitters top deck Either fixed- switchabie-frequency mod uies can piugged T Unit also fits Futaba 7PGK transmitters Redundant Radio Systems T-module mount ed Futaba G-series transmitter Redundant Radio Systems Stage 4 air borne system using two Kraft KPR-8FD re ceivers Error Switch foregoing date deadline abandoning 7208 7216 7232 7240 7296 7564 MHL Perhps manufacturer has gone out business like Kraft Heath Orbit etc worry plenty radio shops will swap crystals Retuning should part job crystals alike know oscillator circuit transmitter receiver tuned characteristics particular kind crystal expected may correct type crystal avallable Swapping wrong type crystal can lead trouble Perhaps have formed sentimental attach mentto oldbox cantfor some reason crystal-swapped retuned bring back within specs case seem have two choices 1 Mount trophies 2 Change electronics Changing electronics relatively easy need contact Ace RIG Inc Box SuE 116 West 19th St Higginsville MO 64037 call 816 584-7121 Ask about Silver Seven Experimenters Special kit No 1 1G247 includes built-up pre tuned RF deck batteries antenna kit seven-channel AM encoder board plus book instructions solder hookup wires board accepts sorts options listed catalog including electronic mixers expo nential rate controls coupled aileron/rudder etc dont like build can buy encoder board separately preassembled like RF board frequency will jump gun little mention Ace will soon have add-on modulation control device existing Silver Seven AM transmitter will narrow-band 1991 requirements So dont rushing off junk AM sets just yet device will released 1991-class dual-conversion AM receiver sure its right Ace president Tom Runge man have never observed overselling products An FM line Ace RC systems also scheduled appear know its right Fred Marks designer Silver Seven other Abe products reports modulation control device will suppress AM sidebands 20 kHx below -60 dD itworks thatwell life Silver Seven design will extended 1990s modulation control device may find some applications other manufac turers designs happens lot complaining FM set owners should stop Im waiting impatiently chance try wondered Calvin Orrs devices planned fit Ace RIG equipment told evaluation units sent Ace asked query directly performance did Tom Runge told considered producing Redundant Radio Sys tem system works very well.exactly advertised found would have taken us year 18 months phase production Mr Orr ready able go production sooner saw no reason ask him wait extra time return investment think Ace RIG special ists RC system enough people want Redundant Radio Systems well reevaluate position Roland Spicer used Ace R/C Silver Seven equipment made 410 mile eighthour cross-Florida RC flight equip ment radiating 72 MHz six meters simultaneously obtaln safety parallel Continued page 136 r L Gentlemen Start engines 4 cycle 1 2 engines Full line computer cut graphics Letters hold script 1 24 colors Made thin plastic fuel resistant Also custom logo service Write details catalog r J C Trainers dl 60 Size40 Size20 Size L See local dealer call us special prices FLYS GREAT IDEAL BEGINNERS AIRPLANE THAT BUILDS IN HALF THE TIME e Jig built balsa fuselage 90% Built wing e Excellent instructions first time builder Full size plans e Decal forms windshield JOHNNIE CASBURN MANUFACTURING CO 5715-5E E Rosedale Fort Worth TX 76112 Day 817/451-7537 t 817/572-1452 Capacitive Discharge Ignition CH Electronics Breakerless CD Ignition System con installed engine 15 large chainsow type new 90 15 two four stroke engines perfect converting CH Ignition system new kits plans airplanes just becoming available perfect size engine Four stroke engines beautiful ign Detonation death four stroke enginewhen control engine timing can stop detonation makes engine run much cooler & develops power-plus no kickback & very low idle CH system used engine expertsMaynard Hill George Aldridge Doran Hiatt Cliff Bennett Otto Bernhart Maynard Hill used CH system lost two world records Available two four stroke engines single twin cylinder Throttle Coupled Spark Advance kits available popular engines Custom engine set-up available Call write price quote Now ETC electronic timing control information brochure price list send *1 00 CH Electronics Inc Box 1732 Riverton WY 82501 Phone 307-857-6897 August 198641 Perfect 12 fourcycle engines 12 lbs 85 wingspan Foam wing monocouque fuselage construction built-up tail members Builds fast strong Fiberglass cowl Ohio OHIO SUPERSTAR PRODUCTS INC er @11376 Ridgoway Rd ington OH 44427 223-1950 IfyoushouldthinkofslipflOtethatB3 what youd see wing RC pilot OK know better say matter relative wind acting upon dihedraled wings banked turn inside wing has greater angle attack outside stabilizes fun Does centrifugal force play part location CGthat high low pendulum effect What does presence centrifugal force banked turn know nothing Dont ask offer C old-fashioned turn-and-bank indicator instrnment tilted would leftbanked turn slip skid yaw equalized pilot coordination ball cen tered skid greater ball would move toward right side slip greater ball sinks toward left side plane itself can center ball what modelers call spirally stable piloting input required neutrally-stable moreacrobatic craft machine man together still center ball ball will center design has some deficiency difficult fly unflyable Whimsy flat-winged Stik close hands-off FF flat-winged Lacey Fike will fly OK Air three-dimensional often think terms two dimensionslike diagram Drop wing aileron pull upelevator model whips around know wing loadings go sky high high some times small heavy models youll snap out control plane pushing agalnst alr toward outside turn its angle attack affected holding upelevator wing perhaps nearer stall large part due centrifugal force free-to-pivot pendulum hung beneath belly would point wonders about Frank Zaics book Circu lar Airflow available AMA Supply & Service Section wondered about airflow phenomenawith turn-and-banked aircraftmany years ago Ive models would fly themselves around 360add bit nose weight becomes 720 vice-versa until cant hold 360 Such models seemingly can fine-tuned go neutrally stable banked circles yet flying hands-off neither recover ing nor degrading continuous-banked turns Argue leave out dont know nuttinunless name Tschirgi Planes wonderful things Perhaps ought wonder Bill Winter 4432 Altura Ct. Faitfax VA 22030 Radio Technique/Myers Continued page 41 redundant RF link Roland Spicer fascinating person talk pursued dream setting RC cross-country record great care intelligence describes event enthusiasm would credit much younger man can see Roland airplane description flight RC Video Magazine Volume 3 plane scale model Wallace Beerys Bellanca dedicated Rolands lifetime friend Allison Buck can seen hanglng ceiling AMA museum AMA Headquarters building Reston VA Ask Hurst Bowers tell about case havent noticed better times interference- reliability-wise rnshing down us George M Myers 70 Froehlich Farm Rd Hicksville NY 11801 RC Aid/Edberg Continued page 43 forklift required four RC channels launcher required two platform up/down launcher release decided use single transmitter con trol both gadgets same time wouldnt need juggle transmitters running experiment decided use trusty Futaba J Series system needed least six channels available Because two receivers would inside vacuum chamber made 1-in-thick solid steel walls felt using J Series quite reasonable transmitter shown behind forklift shots way radio signals get through receivers inside chamber through small Plexiglas window concerned two receivers same fre quency might interfere other both RC systems performed flawlessly through testing As far know first time model RC system has operated vacuum two receivers sub jected share electrical noise motors powered both forklift resetting mechanism launcher noise did affect operation receivers made big racket FM receiver used gather data telemetry system later found out several companies manufacture brushless DC motors supposed operate vacuum out generating electrical noise Next time Im using vacuum Ill give try Both forklift launcher pow ered sealed lead-acid D cells having 4 Ah capacity huge batteries known safe operate vacuum recharged after days testing constant-voltage charger case forklift extra weight lead-acid cells helped provide extra traction driving around foam rubber However often quite enough made snow tires pushing staples facing outward through tires cured traction problem launcher forklift arrangement worked extremely well After bit practice became proficient enough two oould have specimen back top launcher within 2 minutes may seem long time until consider specimen bounces ran domly foam-rubber-covered floor takes 90 seconds just recycle launcher case much less time 20 minutes needed recycle vacuum chamber wont go details results testing because really terest people field space craft dynamics will say results good enough Stanford award 136 Model Aviation Eke. Quality r S 937 x 156 x 175 18 oz 46 oz torque Years development have produced finest state-ofthe art receivers ever made Flight tests over country haveThe workhorse Ace servos Perfect Patternships Quarter Scale Boats Cars proven receiver will fly others fail Solid glitch-freeapplication high power required performance air plane attitude frequencies/channelsLIIIIIJ 14G20AAtlas Servo Kit$2395 Available Z7 50 53 72 75mHzAC 14G2OACAtlas Servo assembled$3146 12G70 Silver Seven Receiver Kit$3895 Available dealer order direct add $200 Ace RIC 116W 19th St Box SuB Higginsville MO 64037 816 584-721
Edition: Model Aviation - 1986/08
Page Numbers: 40, 41, 136
eorgeMMyer _____________________ Radio Technipue THE REDUNDANT RADIO SYSTEM Back July 1985 issue wrote little bit about possible improvement interference resistance through use parallel redundant RC systems Id like see redundant radio systems Scale model particularly Giant Scale model routine matterjust added safety will provide Show Team model should carry isnt new idea because Good brothers used parallel RC channels control earliest RC systems Simultaneous use several RC channels dropped out favor single-channel RC became quite reliable available number channels very small RC population grew users RC adjacent channels became much numerous Interference became problem expected given 50 channels 72 73 MHz band RC aircraft People asked channels cant fly 50 planes time Usually people doing asking have never tried fly 50 airplanes time really wouldnt know whats possible what isnt would may people now realize really dont have 50 channels because technical properties radios limit us 17 channels time proposed put some unused channels work parallel redundant control channels based know ledge better receivers coming Along came IMS show showed up Calvin Orr Custom Electronics PO Box 1332 Alta Loma CA 91701 sells redundant radio system Kraft KPT7C Futaba 7FGK transmitters As shown photo Calvin using 72 MHz channel six-meter 50 53 MHz channel Amateur license required implementation T-shaped module plugs transmitter accepts two other mod ules BOTH OF WHICH RADIATE AT THE SAME TIME FROM THE ONE ANTENNA proviso both modules must use same modulation both AM both FM brochure passed out IMS show January 1986 held California Calvin traced evolution Redundant Radio System follows Stage 1 transmitter two airborne packs System flies left side airplane engine cutoff System B flies right side throttle Eloy Marez complete description experiments type system about five years ago ACM Stage 2 Two complete RC systems modi fied buddy-box cable permits control signals transmitter sent through transmitter ZIIIIZ ECEIVER w _ B well Two airborne systems Stage 1 Transmitter B sits ground pilot flies transmitter Stage 3 transmitter equipped frequency combiner radiating same com mands two RC channels simultaneously Two airborne systems Stage 1 Stage 4 Same Stage 3 error switch added output receivers B two receivers airplane receive same control signals albeit different radio frequencies decode An error switch samples outputs event inter ference loss signal frequencies error switch ignores output receiver routes control pulses other receiver servos mind intelligent way RC system act deep Radio Technique bow Calvin discussing Stage 4 Redundant Radio System Calvin asked two 72 MHz RC modules could used transmitter T per original intention use 72 MHz channels answer units Im selling right now because cost necessary isolators would cost another transmitter Therefore want use two 72 MHz frequencies should use Stage 2 system two transmitters modified buddy box cable Error Switch have Error Switch order Bob Aberle will performing some tests using Stage 2-4 system will reported later column AB RECEIVER B II II Schematic diagram Stage 4 Redundant Radio System Author George Myers devotes iot months coiumn discussing LEFT ELEVRIGHT ELEV ERRORI SERVOSLEFT AlLRIGHT AlL SW IT OHRUDDERENGINE 40 Model Aviation Swap crystalsor electronics De cember 20 1987 just around corner have procrastinated about shifting old radio new frequencies advised / Redundant Radio System T-moduie Kraft KPT7C transmitter units iegs resting transmitter can cut off necessary make ciearance knobs switches transmitters top deck Either fixed- switchabie-frequency mod uies can piugged T Unit also fits Futaba 7PGK transmitters Redundant Radio Systems T-module mount ed Futaba G-series transmitter Redundant Radio Systems Stage 4 air borne system using two Kraft KPR-8FD re ceivers Error Switch foregoing date deadline abandoning 7208 7216 7232 7240 7296 7564 MHL Perhps manufacturer has gone out business like Kraft Heath Orbit etc worry plenty radio shops will swap crystals Retuning should part job crystals alike know oscillator circuit transmitter receiver tuned characteristics particular kind crystal expected may correct type crystal avallable Swapping wrong type crystal can lead trouble Perhaps have formed sentimental attach mentto oldbox cantfor some reason crystal-swapped retuned bring back within specs case seem have two choices 1 Mount trophies 2 Change electronics Changing electronics relatively easy need contact Ace RIG Inc Box SuE 116 West 19th St Higginsville MO 64037 call 816 584-7121 Ask about Silver Seven Experimenters Special kit No 1 1G247 includes built-up pre tuned RF deck batteries antenna kit seven-channel AM encoder board plus book instructions solder hookup wires board accepts sorts options listed catalog including electronic mixers expo nential rate controls coupled aileron/rudder etc dont like build can buy encoder board separately preassembled like RF board frequency will jump gun little mention Ace will soon have add-on modulation control device existing Silver Seven AM transmitter will narrow-band 1991 requirements So dont rushing off junk AM sets just yet device will released 1991-class dual-conversion AM receiver sure its right Ace president Tom Runge man have never observed overselling products An FM line Ace RC systems also scheduled appear know its right Fred Marks designer Silver Seven other Abe products reports modulation control device will suppress AM sidebands 20 kHx below -60 dD itworks thatwell life Silver Seven design will extended 1990s modulation control device may find some applications other manufac turers designs happens lot complaining FM set owners should stop Im waiting impatiently chance try wondered Calvin Orrs devices planned fit Ace RIG equipment told evaluation units sent Ace asked query directly performance did Tom Runge told considered producing Redundant Radio Sys tem system works very well.exactly advertised found would have taken us year 18 months phase production Mr Orr ready able go production sooner saw no reason ask him wait extra time return investment think Ace RIG special ists RC system enough people want Redundant Radio Systems well reevaluate position Roland Spicer used Ace R/C Silver Seven equipment made 410 mile eighthour cross-Florida RC flight equip ment radiating 72 MHz six meters simultaneously obtaln safety parallel Continued page 136 r L Gentlemen Start engines 4 cycle 1 2 engines Full line computer cut graphics Letters hold script 1 24 colors Made thin plastic fuel resistant Also custom logo service Write details catalog r J C Trainers dl 60 Size40 Size20 Size L See local dealer call us special prices FLYS GREAT IDEAL BEGINNERS AIRPLANE THAT BUILDS IN HALF THE TIME e Jig built balsa fuselage 90% Built wing e Excellent instructions first time builder Full size plans e Decal forms windshield JOHNNIE CASBURN MANUFACTURING CO 5715-5E E Rosedale Fort Worth TX 76112 Day 817/451-7537 t 817/572-1452 Capacitive Discharge Ignition CH Electronics Breakerless CD Ignition System con installed engine 15 large chainsow type new 90 15 two four stroke engines perfect converting CH Ignition system new kits plans airplanes just becoming available perfect size engine Four stroke engines beautiful ign Detonation death four stroke enginewhen control engine timing can stop detonation makes engine run much cooler & develops power-plus no kickback & very low idle CH system used engine expertsMaynard Hill George Aldridge Doran Hiatt Cliff Bennett Otto Bernhart Maynard Hill used CH system lost two world records Available two four stroke engines single twin cylinder Throttle Coupled Spark Advance kits available popular engines Custom engine set-up available Call write price quote Now ETC electronic timing control information brochure price list send *1 00 CH Electronics Inc Box 1732 Riverton WY 82501 Phone 307-857-6897 August 198641 Perfect 12 fourcycle engines 12 lbs 85 wingspan Foam wing monocouque fuselage construction built-up tail members Builds fast strong Fiberglass cowl Ohio OHIO SUPERSTAR PRODUCTS INC er @11376 Ridgoway Rd ington OH 44427 223-1950 IfyoushouldthinkofslipflOtethatB3 what youd see wing RC pilot OK know better say matter relative wind acting upon dihedraled wings banked turn inside wing has greater angle attack outside stabilizes fun Does centrifugal force play part location CGthat high low pendulum effect What does presence centrifugal force banked turn know nothing Dont ask offer C old-fashioned turn-and-bank indicator instrnment tilted would leftbanked turn slip skid yaw equalized pilot coordination ball cen tered skid greater ball would move toward right side slip greater ball sinks toward left side plane itself can center ball what modelers call spirally stable piloting input required neutrally-stable moreacrobatic craft machine man together still center ball ball will center design has some deficiency difficult fly unflyable Whimsy flat-winged Stik close hands-off FF flat-winged Lacey Fike will fly OK Air three-dimensional often think terms two dimensionslike diagram Drop wing aileron pull upelevator model whips around know wing loadings go sky high high some times small heavy models youll snap out control plane pushing agalnst alr toward outside turn its angle attack affected holding upelevator wing perhaps nearer stall large part due centrifugal force free-to-pivot pendulum hung beneath belly would point wonders about Frank Zaics book Circu lar Airflow available AMA Supply & Service Section wondered about airflow phenomenawith turn-and-banked aircraftmany years ago Ive models would fly themselves around 360add bit nose weight becomes 720 vice-versa until cant hold 360 Such models seemingly can fine-tuned go neutrally stable banked circles yet flying hands-off neither recover ing nor degrading continuous-banked turns Argue leave out dont know nuttinunless name Tschirgi Planes wonderful things Perhaps ought wonder Bill Winter 4432 Altura Ct. Faitfax VA 22030 Radio Technique/Myers Continued page 41 redundant RF link Roland Spicer fascinating person talk pursued dream setting RC cross-country record great care intelligence describes event enthusiasm would credit much younger man can see Roland airplane description flight RC Video Magazine Volume 3 plane scale model Wallace Beerys Bellanca dedicated Rolands lifetime friend Allison Buck can seen hanglng ceiling AMA museum AMA Headquarters building Reston VA Ask Hurst Bowers tell about case havent noticed better times interference- reliability-wise rnshing down us George M Myers 70 Froehlich Farm Rd Hicksville NY 11801 RC Aid/Edberg Continued page 43 forklift required four RC channels launcher required two platform up/down launcher release decided use single transmitter con trol both gadgets same time wouldnt need juggle transmitters running experiment decided use trusty Futaba J Series system needed least six channels available Because two receivers would inside vacuum chamber made 1-in-thick solid steel walls felt using J Series quite reasonable transmitter shown behind forklift shots way radio signals get through receivers inside chamber through small Plexiglas window concerned two receivers same fre quency might interfere other both RC systems performed flawlessly through testing As far know first time model RC system has operated vacuum two receivers sub jected share electrical noise motors powered both forklift resetting mechanism launcher noise did affect operation receivers made big racket FM receiver used gather data telemetry system later found out several companies manufacture brushless DC motors supposed operate vacuum out generating electrical noise Next time Im using vacuum Ill give try Both forklift launcher pow ered sealed lead-acid D cells having 4 Ah capacity huge batteries known safe operate vacuum recharged after days testing constant-voltage charger case forklift extra weight lead-acid cells helped provide extra traction driving around foam rubber However often quite enough made snow tires pushing staples facing outward through tires cured traction problem launcher forklift arrangement worked extremely well After bit practice became proficient enough two oould have specimen back top launcher within 2 minutes may seem long time until consider specimen bounces ran domly foam-rubber-covered floor takes 90 seconds just recycle launcher case much less time 20 minutes needed recycle vacuum chamber wont go details results testing because really terest people field space craft dynamics will say results good enough Stanford award 136 Model Aviation Eke. Quality r S 937 x 156 x 175 18 oz 46 oz torque Years development have produced finest state-ofthe art receivers ever made Flight tests over country haveThe workhorse Ace servos Perfect Patternships Quarter Scale Boats Cars proven receiver will fly others fail Solid glitch-freeapplication high power required performance air plane attitude frequencies/channelsLIIIIIJ 14G20AAtlas Servo Kit$2395 Available Z7 50 53 72 75mHzAC 14G2OACAtlas Servo assembled$3146 12G70 Silver Seven Receiver Kit$3895 Available dealer order direct add $200 Ace RIC 116W 19th St Box SuB Higginsville MO 64037 816 584-721
Edition: Model Aviation - 1986/08
Page Numbers: 40, 41, 136
eorgeMMyer _____________________ Radio Technipue THE REDUNDANT RADIO SYSTEM Back July 1985 issue wrote little bit about possible improvement interference resistance through use parallel redundant RC systems Id like see redundant radio systems Scale model particularly Giant Scale model routine matterjust added safety will provide Show Team model should carry isnt new idea because Good brothers used parallel RC channels control earliest RC systems Simultaneous use several RC channels dropped out favor single-channel RC became quite reliable available number channels very small RC population grew users RC adjacent channels became much numerous Interference became problem expected given 50 channels 72 73 MHz band RC aircraft People asked channels cant fly 50 planes time Usually people doing asking have never tried fly 50 airplanes time really wouldnt know whats possible what isnt would may people now realize really dont have 50 channels because technical properties radios limit us 17 channels time proposed put some unused channels work parallel redundant control channels based know ledge better receivers coming Along came IMS show showed up Calvin Orr Custom Electronics PO Box 1332 Alta Loma CA 91701 sells redundant radio system Kraft KPT7C Futaba 7FGK transmitters As shown photo Calvin using 72 MHz channel six-meter 50 53 MHz channel Amateur license required implementation T-shaped module plugs transmitter accepts two other mod ules BOTH OF WHICH RADIATE AT THE SAME TIME FROM THE ONE ANTENNA proviso both modules must use same modulation both AM both FM brochure passed out IMS show January 1986 held California Calvin traced evolution Redundant Radio System follows Stage 1 transmitter two airborne packs System flies left side airplane engine cutoff System B flies right side throttle Eloy Marez complete description experiments type system about five years ago ACM Stage 2 Two complete RC systems modi fied buddy-box cable permits control signals transmitter sent through transmitter ZIIIIZ ECEIVER w _ B well Two airborne systems Stage 1 Transmitter B sits ground pilot flies transmitter Stage 3 transmitter equipped frequency combiner radiating same com mands two RC channels simultaneously Two airborne systems Stage 1 Stage 4 Same Stage 3 error switch added output receivers B two receivers airplane receive same control signals albeit different radio frequencies decode An error switch samples outputs event inter ference loss signal frequencies error switch ignores output receiver routes control pulses other receiver servos mind intelligent way RC system act deep Radio Technique bow Calvin discussing Stage 4 Redundant Radio System Calvin asked two 72 MHz RC modules could used transmitter T per original intention use 72 MHz channels answer units Im selling right now because cost necessary isolators would cost another transmitter Therefore want use two 72 MHz frequencies should use Stage 2 system two transmitters modified buddy box cable Error Switch have Error Switch order Bob Aberle will performing some tests using Stage 2-4 system will reported later column AB RECEIVER B II II Schematic diagram Stage 4 Redundant Radio System Author George Myers devotes iot months coiumn discussing LEFT ELEVRIGHT ELEV ERRORI SERVOSLEFT AlLRIGHT AlL SW IT OHRUDDERENGINE 40 Model Aviation Swap crystalsor electronics De cember 20 1987 just around corner have procrastinated about shifting old radio new frequencies advised / Redundant Radio System T-moduie Kraft KPT7C transmitter units iegs resting transmitter can cut off necessary make ciearance knobs switches transmitters top deck Either fixed- switchabie-frequency mod uies can piugged T Unit also fits Futaba 7PGK transmitters Redundant Radio Systems T-module mount ed Futaba G-series transmitter Redundant Radio Systems Stage 4 air borne system using two Kraft KPR-8FD re ceivers Error Switch foregoing date deadline abandoning 7208 7216 7232 7240 7296 7564 MHL Perhps manufacturer has gone out business like Kraft Heath Orbit etc worry plenty radio shops will swap crystals Retuning should part job crystals alike know oscillator circuit transmitter receiver tuned characteristics particular kind crystal expected may correct type crystal avallable Swapping wrong type crystal can lead trouble Perhaps have formed sentimental attach mentto oldbox cantfor some reason crystal-swapped retuned bring back within specs case seem have two choices 1 Mount trophies 2 Change electronics Changing electronics relatively easy need contact Ace RIG Inc Box SuE 116 West 19th St Higginsville MO 64037 call 816 584-7121 Ask about Silver Seven Experimenters Special kit No 1 1G247 includes built-up pre tuned RF deck batteries antenna kit seven-channel AM encoder board plus book instructions solder hookup wires board accepts sorts options listed catalog including electronic mixers expo nential rate controls coupled aileron/rudder etc dont like build can buy encoder board separately preassembled like RF board frequency will jump gun little mention Ace will soon have add-on modulation control device existing Silver Seven AM transmitter will narrow-band 1991 requirements So dont rushing off junk AM sets just yet device will released 1991-class dual-conversion AM receiver sure its right Ace president Tom Runge man have never observed overselling products An FM line Ace RC systems also scheduled appear know its right Fred Marks designer Silver Seven other Abe products reports modulation control device will suppress AM sidebands 20 kHx below -60 dD itworks thatwell life Silver Seven design will extended 1990s modulation control device may find some applications other manufac turers designs happens lot complaining FM set owners should stop Im waiting impatiently chance try wondered Calvin Orrs devices planned fit Ace RIG equipment told evaluation units sent Ace asked query directly performance did Tom Runge told considered producing Redundant Radio Sys tem system works very well.exactly advertised found would have taken us year 18 months phase production Mr Orr ready able go production sooner saw no reason ask him wait extra time return investment think Ace RIG special ists RC system enough people want Redundant Radio Systems well reevaluate position Roland Spicer used Ace R/C Silver Seven equipment made 410 mile eighthour cross-Florida RC flight equip ment radiating 72 MHz six meters simultaneously obtaln safety parallel Continued page 136 r L Gentlemen Start engines 4 cycle 1 2 engines Full line computer cut graphics Letters hold script 1 24 colors Made thin plastic fuel resistant Also custom logo service Write details catalog r J C Trainers dl 60 Size40 Size20 Size L See local dealer call us special prices FLYS GREAT IDEAL BEGINNERS AIRPLANE THAT BUILDS IN HALF THE TIME e Jig built balsa fuselage 90% Built wing e Excellent instructions first time builder Full size plans e Decal forms windshield JOHNNIE CASBURN MANUFACTURING CO 5715-5E E Rosedale Fort Worth TX 76112 Day 817/451-7537 t 817/572-1452 Capacitive Discharge Ignition CH Electronics Breakerless CD Ignition System con installed engine 15 large chainsow type new 90 15 two four stroke engines perfect converting CH Ignition system new kits plans airplanes just becoming available perfect size engine Four stroke engines beautiful ign Detonation death four stroke enginewhen control engine timing can stop detonation makes engine run much cooler & develops power-plus no kickback & very low idle CH system used engine expertsMaynard Hill George Aldridge Doran Hiatt Cliff Bennett Otto Bernhart Maynard Hill used CH system lost two world records Available two four stroke engines single twin cylinder Throttle Coupled Spark Advance kits available popular engines Custom engine set-up available Call write price quote Now ETC electronic timing control information brochure price list send *1 00 CH Electronics Inc Box 1732 Riverton WY 82501 Phone 307-857-6897 August 198641 Perfect 12 fourcycle engines 12 lbs 85 wingspan Foam wing monocouque fuselage construction built-up tail members Builds fast strong Fiberglass cowl Ohio OHIO SUPERSTAR PRODUCTS INC er @11376 Ridgoway Rd ington OH 44427 223-1950 IfyoushouldthinkofslipflOtethatB3 what youd see wing RC pilot OK know better say matter relative wind acting upon dihedraled wings banked turn inside wing has greater angle attack outside stabilizes fun Does centrifugal force play part location CGthat high low pendulum effect What does presence centrifugal force banked turn know nothing Dont ask offer C old-fashioned turn-and-bank indicator instrnment tilted would leftbanked turn slip skid yaw equalized pilot coordination ball cen tered skid greater ball would move toward right side slip greater ball sinks toward left side plane itself can center ball what modelers call spirally stable piloting input required neutrally-stable moreacrobatic craft machine man together still center ball ball will center design has some deficiency difficult fly unflyable Whimsy flat-winged Stik close hands-off FF flat-winged Lacey Fike will fly OK Air three-dimensional often think terms two dimensionslike diagram Drop wing aileron pull upelevator model whips around know wing loadings go sky high high some times small heavy models youll snap out control plane pushing agalnst alr toward outside turn its angle attack affected holding upelevator wing perhaps nearer stall large part due centrifugal force free-to-pivot pendulum hung beneath belly would point wonders about Frank Zaics book Circu lar Airflow available AMA Supply & Service Section wondered about airflow phenomenawith turn-and-banked aircraftmany years ago Ive models would fly themselves around 360add bit nose weight becomes 720 vice-versa until cant hold 360 Such models seemingly can fine-tuned go neutrally stable banked circles yet flying hands-off neither recover ing nor degrading continuous-banked turns Argue leave out dont know nuttinunless name Tschirgi Planes wonderful things Perhaps ought wonder Bill Winter 4432 Altura Ct. Faitfax VA 22030 Radio Technique/Myers Continued page 41 redundant RF link Roland Spicer fascinating person talk pursued dream setting RC cross-country record great care intelligence describes event enthusiasm would credit much younger man can see Roland airplane description flight RC Video Magazine Volume 3 plane scale model Wallace Beerys Bellanca dedicated Rolands lifetime friend Allison Buck can seen hanglng ceiling AMA museum AMA Headquarters building Reston VA Ask Hurst Bowers tell about case havent noticed better times interference- reliability-wise rnshing down us George M Myers 70 Froehlich Farm Rd Hicksville NY 11801 RC Aid/Edberg Continued page 43 forklift required four RC channels launcher required two platform up/down launcher release decided use single transmitter con trol both gadgets same time wouldnt need juggle transmitters running experiment decided use trusty Futaba J Series system needed least six channels available Because two receivers would inside vacuum chamber made 1-in-thick solid steel walls felt using J Series quite reasonable transmitter shown behind forklift shots way radio signals get through receivers inside chamber through small Plexiglas window concerned two receivers same fre quency might interfere other both RC systems performed flawlessly through testing As far know first time model RC system has operated vacuum two receivers sub jected share electrical noise motors powered both forklift resetting mechanism launcher noise did affect operation receivers made big racket FM receiver used gather data telemetry system later found out several companies manufacture brushless DC motors supposed operate vacuum out generating electrical noise Next time Im using vacuum Ill give try Both forklift launcher pow ered sealed lead-acid D cells having 4 Ah capacity huge batteries known safe operate vacuum recharged after days testing constant-voltage charger case forklift extra weight lead-acid cells helped provide extra traction driving around foam rubber However often quite enough made snow tires pushing staples facing outward through tires cured traction problem launcher forklift arrangement worked extremely well After bit practice became proficient enough two oould have specimen back top launcher within 2 minutes may seem long time until consider specimen bounces ran domly foam-rubber-covered floor takes 90 seconds just recycle launcher case much less time 20 minutes needed recycle vacuum chamber wont go details results testing because really terest people field space craft dynamics will say results good enough Stanford award 136 Model Aviation Eke. Quality r S 937 x 156 x 175 18 oz 46 oz torque Years development have produced finest state-ofthe art receivers ever made Flight tests over country haveThe workhorse Ace servos Perfect Patternships Quarter Scale Boats Cars proven receiver will fly others fail Solid glitch-freeapplication high power required performance air plane attitude frequencies/channelsLIIIIIJ 14G20AAtlas Servo Kit$2395 Available Z7 50 53 72 75mHzAC 14G2OACAtlas Servo assembled$3146 12G70 Silver Seven Receiver Kit$3895 Available dealer order direct add $200 Ace RIC 116W 19th St Box SuB Higginsville MO 64037 816 584-721