Continued page 153 Dual Batter y System EJerry Smith Radio installations require lots servos control model may experience own unique form glitching nifty mod receivers solves problem enhances system stability DO YOU FLY Giant Scale airplanes Are rent increased demand current tery pack came system running multiple servos experienc- causes momentary voltage drop ripple since draws very little current can ing some glitching radio Could through entire systemand receiv- fitted smaller pack 250 mAh youre short battery power Some er sensing low voltage temporarily los- less servos other hand modelers like use six seven servo func- es sensitivity During split-second loss powered hefty 1500 mAh pack tionsand top off double up sensitivity receiver sends glitch power supply has its own switch some servos increase power added servos resulting twitch can charging jack safety means its possible wind up seen control surfaces situa- Now servos move receiver eight nine servos airplane tion becomes pronounced doesnt sense voltage drop because its radio system servos battery flat part dis- independent power source unaffected sitting idle drawing small fixed charge curve servos meantime have suffi amount current command dual battery system provides way cient power slight voltage drop given stick transmitter moved around problem system re- system will interfere performa servo several servos respond mov- ceiver powered separately ser- ance ing drawing significantly cur- vos can powered original bat I i - PRINTED Left A typical Alrtronics receiver shown after positive voltage track receiver has cut Most circuit board tracks coated material must scraped away before wire can soldered Right Airtronics receiver uses typical bus track supply current servo connectors track will cut far right just after last servo connectors photos author Left The World Engines Expert receiver can easily converted dual-battery system lead supplying receiver voltage shown sol dered place Jerry recommends using Deans connectors because easy solder Dont forget shrink tubing over solder joints Right World Engines receiver completely modified thats left plug two battery packs two switch harnesses 36 Model Aviation Seagull/Byrum Continued page 149 presents no special problems parts should carefully sanded primed before assembly stringers canopy used basswood available railroad section hobby shop After covering priming fuselage finishing cockpit interior canopy glazed 015 clear plastic Sig Wil holds RC-56 very good adhesive taching canopy stabilizer fin covered Parsons brand fiberglass before being joined fuselage Glass cloth also used wing fairing interplane struts wheel pants wooden surface covered fabric Dan Parsons has very good set instructions will send cloth method much easier infinitely lighter old poly ester method Open framework should covered Super Coverite primed nitrate dope sprayed avoid brush stroke marks used Sig Superoote clear nitrate dope followed col ored butyrate dope Apply several coats rub down steel wool magnet will remove small steel particles re main Supercote silver particularly tractive color heavily pigmented Before flying model check radio power off engine running full throffle good practice also make power check using smaller prop youll flying ap proximates in-flight higher rpm 25 lb Seagull takes off about 100 ft no wind Rudder response dur ing takeoff very good launches smooth graceful landing technique try hold foot off runway ap plying more up elevator air plane slows down until finally settles itself dont always succeed I get nice landing interest encouragement Bill Winter acknowledged appreciated Also advice library staff National Aviation Space Museum Washington DC very helpful lads very very knowledgeable helped make day spent doing re search Seagull best life written Seagull 25 flights flight emo tional experience Hope enjoy yours well Radio Technique/Myers Continued page 35 AMA Academy Model Aeronautics National organization aeromodelers member NAA representative United States America negotiations world pub lisher Model Aviation magazine EAA Experimental Aircraft Association National organization builders homemade man-carrying aircraft Frequent users RC mod els investigate verify performance air craft designs EC Executive CouncilGovermng body AMA consisting President Executive Vice-President Executive Director 11 Dis trict Vice-Presidents FAA Federal Aviation Administrationpart US Federal Government charged regulating transportation use air above nation FAI Federation Aeronautique Internationale Organization oversees coordinates aerospace competitions records based Paris France FC Frequency CommitteeAdvisory body AMA Executive Council matters pertain ing obtaining using radio frequencies hobby purposes FCC Federal Communications Commission part US Federal Government charged regulating radio frequency transmissions FM frequency modulationa system im pressing information radio frequency trans mission adding information moves assigned radio frequency intelligible man ner FSK frequency-shift keyinga system im pressing information radio frequency trans mission shifting between two radio frequen cies intelligible manner system actually used RC systems described FM systems HQ headquartersin case AMA lo cated 1810 Samuel Morse Drive Reston VA 22090 NAA National Aeronautic Association members include EAA AMA other US aviation associations US national aero club recognized FAI PC printed circuita method connecting electronic components etched copper foil path ways PCM pulse-code modulationa system encoding modulation radio frequency use computer words can decoded control commands computer receiver PWM pulse-width modulationa system encoding modulation radio frequency uses time between pulses analog desired control position system common system years 1969-1988 RC sometimes RIC radio-controlled Describes systems human commands delivered machines way radio link RF radio frequencypertains systems generate electromagnetic radiations ra dio frequencies RFI fradio frequency interferenceany elec tromagnetic radiation degrades radio link RC system RXradio receiver XM7Rradio transmitter XTAL sometimes XTL crystalcommon frequency-determining element XMTR RX Battery/Smith Continued page 36 Making use dual battery system relatively simple does entail adding negative positive lead receiver connector supply current Generally existing power connector built receiver can used servo power supply receivers experience Great Performance Quartet x DALOTEL 850 SPAN 69 InsWING AREA 830 sq ins U SPAN 76 EXTRA 230 WING AREA 900 sq ins series Sport Scale Balsa ARF Airplanes 120-4 cycle equivalent motors available direct select hobby shops - ZEMPRO MARKETING I- PO BOX 3076 OAK RIDGE TN 37830 PHONE 6154826188 January 1989 153 CHIPMUNK 850 SPAN 70 insWING AREA 850 sq ins ZLIN 526 SPAN 72 insWING AREA 900 sq ins GAS OR ELECTRIC COMING SOON PAONTO 40&604/ SEE YOUR DEA LER PUP 40 TRAINER SPORT J-3 PLAYMATE SUPER PLAYMATE 40 L PLAYMATE ELECTRIC50 SPAR WATCR POE MORE2025 AR Rdewater Hobby Enterprises R II 4lct SRPIELDPL 32691V4I%JnRDAVED 2025 $5495 2454653MC/VIUA4 GRAs VINTAGE FORSTER ENGINES Using original casting dies lastest computer controlled machin ery RJL producing highest quality lowest priced vintage engines available Both engines come complete original reprinted box literature Ignition version equipped clear plastic tank single speed Forster timer Both engines perfect SAM Old Time Stunt events Delivery Dec 88 glow Mar 89 ignition Satisfaction Guaranteedl Add $300 per engine shipping handling Calif residents add sales tax Glow plug spark plug coil condenser included RJL INDUSTRIES PO Box 5 Sierra Madre CA 91024 818 3590016 154 Model Aviation positive negative voltage servo connector bussed along printed wiring board track easily traceable printed circuit board positive voltage source feeds receiver via printed circuit track necessary cut track between last servo connector bus first component re ceiver board order receiver have its own battery recommend using deans connectors easily soldered have goldplated pins Most radios have connectors cannot unsoldered things could get involved youre handy sol dering iron unfamiliar basic electronics dont attempt operation yourself Seek assistance Another consider ation radio new under war ranty may want conimit permanent alterations Its something think about dual battery scheme has benefited radio systems date youve iden tified glitching due voltage dropoff problem do-it-yourself rem edy well worth considering Perhaps future well see radios Giant Scale air planes built wayor offered alter native standard radio Until will have modify own RC Giant Scale/de Vries Continued page 39 wings trailing edge another strip 1A6 ply wood smooth continuous airfoil section Although sounds complicated Mr Fowlers model Fowler flap mechanism actually beauti fully simple very reliable operation Check drawings carefully adapt model back noted effect broken props radiosWe told sad tale two Giants bit dust because excess engine vibration ren dered servos impotent New friend Warren Spur geon called during month similar tale woe model flying coin cidentally Ziroli P-40 bird flew beautiful lycompletely aerobatic stable rock power plant Zenoah G-62 therein lies tale boring skillful holes sky Warren realized didnt have control Warhawk realization confirmed model proceeded powder itself against unyielding earth onfield post-mortem revealed nothing would have caused accident Despite fact retracts salvageable major component beside radio survive impact radio seemed function properly r very careful examination engine told story far Warren concerned Hidden side prop drive assembly locknut parently come adrift allowing flywheel slip forward tapered prop shaft slippage severely unbalanced engine tendant severe vibrationsevere enough render RC servos unable control mod el Warren reported tapered prop shaft visibly chafed sort failure difficulteven impossibleto predict Partial disassembly engine make sure everything locked up tight possible corrective action could come up Maybe jiggle flywheel might have revealed loose locknut could have come loose air after checked What omnipresent Mur phy author well-known laws bear name time/dollar investment Giant Scale models Mr Spurgeons experience points up safety rule great force Check everything before crank up seems Pat Corderman Cordys Flying Circus 1502 N Prospect Colorado Springs CO 80907 designer/producer spectacular fiberglass Northrop Gamma kit column Oc tober 1988 may have solved park-bench al leron problem Earlier prototypes model avoided sexy Scale touch since Pat test pilot Jack Cole feared its use might lead aileron flutter Pat has designed built new wing park-benchers flight testing cur rently underway Gammas used above-the-wing ailerons also almost-fullspan split flaps Pats duplicated well Hes also working next kitting effort Itll Ed Carrolls giant Wily Coyote will feature all-fiberglass fuselage Although Coyote biggie may flown anything nose 90 up event prototype Pats Coyote kit should flying read column Back next month photos news about some very interesting Giant birds Ikon Northwest responding advertisers mention read about ModelAviation Super pLaymale 60 60 SERRES HAS 64 SER4IUYMEThICALALUMINIR4 MAIN OEARPUEL TARE 45602 CYCLE AND MOTOR MOUNT ALL RE 48904 CYCLE $109952 Hour frame op kAts 25 sloe
Edition: Model Aviation - 1989/01
Page Numbers: 36, 153, 154
Continued page 153 Dual Batter y System EJerry Smith Radio installations require lots servos control model may experience own unique form glitching nifty mod receivers solves problem enhances system stability DO YOU FLY Giant Scale airplanes Are rent increased demand current tery pack came system running multiple servos experienc- causes momentary voltage drop ripple since draws very little current can ing some glitching radio Could through entire systemand receiv- fitted smaller pack 250 mAh youre short battery power Some er sensing low voltage temporarily los- less servos other hand modelers like use six seven servo func- es sensitivity During split-second loss powered hefty 1500 mAh pack tionsand top off double up sensitivity receiver sends glitch power supply has its own switch some servos increase power added servos resulting twitch can charging jack safety means its possible wind up seen control surfaces situa- Now servos move receiver eight nine servos airplane tion becomes pronounced doesnt sense voltage drop because its radio system servos battery flat part dis- independent power source unaffected sitting idle drawing small fixed charge curve servos meantime have suffi amount current command dual battery system provides way cient power slight voltage drop given stick transmitter moved around problem system re- system will interfere performa servo several servos respond mov- ceiver powered separately ser- ance ing drawing significantly cur- vos can powered original bat I i - PRINTED Left A typical Alrtronics receiver shown after positive voltage track receiver has cut Most circuit board tracks coated material must scraped away before wire can soldered Right Airtronics receiver uses typical bus track supply current servo connectors track will cut far right just after last servo connectors photos author Left The World Engines Expert receiver can easily converted dual-battery system lead supplying receiver voltage shown sol dered place Jerry recommends using Deans connectors because easy solder Dont forget shrink tubing over solder joints Right World Engines receiver completely modified thats left plug two battery packs two switch harnesses 36 Model Aviation Seagull/Byrum Continued page 149 presents no special problems parts should carefully sanded primed before assembly stringers canopy used basswood available railroad section hobby shop After covering priming fuselage finishing cockpit interior canopy glazed 015 clear plastic Sig Wil holds RC-56 very good adhesive taching canopy stabilizer fin covered Parsons brand fiberglass before being joined fuselage Glass cloth also used wing fairing interplane struts wheel pants wooden surface covered fabric Dan Parsons has very good set instructions will send cloth method much easier infinitely lighter old poly ester method Open framework should covered Super Coverite primed nitrate dope sprayed avoid brush stroke marks used Sig Superoote clear nitrate dope followed col ored butyrate dope Apply several coats rub down steel wool magnet will remove small steel particles re main Supercote silver particularly tractive color heavily pigmented Before flying model check radio power off engine running full throffle good practice also make power check using smaller prop youll flying ap proximates in-flight higher rpm 25 lb Seagull takes off about 100 ft no wind Rudder response dur ing takeoff very good launches smooth graceful landing technique try hold foot off runway ap plying more up elevator air plane slows down until finally settles itself dont always succeed I get nice landing interest encouragement Bill Winter acknowledged appreciated Also advice library staff National Aviation Space Museum Washington DC very helpful lads very very knowledgeable helped make day spent doing re search Seagull best life written Seagull 25 flights flight emo tional experience Hope enjoy yours well Radio Technique/Myers Continued page 35 AMA Academy Model Aeronautics National organization aeromodelers member NAA representative United States America negotiations world pub lisher Model Aviation magazine EAA Experimental Aircraft Association National organization builders homemade man-carrying aircraft Frequent users RC mod els investigate verify performance air craft designs EC Executive CouncilGovermng body AMA consisting President Executive Vice-President Executive Director 11 Dis trict Vice-Presidents FAA Federal Aviation Administrationpart US Federal Government charged regulating transportation use air above nation FAI Federation Aeronautique Internationale Organization oversees coordinates aerospace competitions records based Paris France FC Frequency CommitteeAdvisory body AMA Executive Council matters pertain ing obtaining using radio frequencies hobby purposes FCC Federal Communications Commission part US Federal Government charged regulating radio frequency transmissions FM frequency modulationa system im pressing information radio frequency trans mission adding information moves assigned radio frequency intelligible man ner FSK frequency-shift keyinga system im pressing information radio frequency trans mission shifting between two radio frequen cies intelligible manner system actually used RC systems described FM systems HQ headquartersin case AMA lo cated 1810 Samuel Morse Drive Reston VA 22090 NAA National Aeronautic Association members include EAA AMA other US aviation associations US national aero club recognized FAI PC printed circuita method connecting electronic components etched copper foil path ways PCM pulse-code modulationa system encoding modulation radio frequency use computer words can decoded control commands computer receiver PWM pulse-width modulationa system encoding modulation radio frequency uses time between pulses analog desired control position system common system years 1969-1988 RC sometimes RIC radio-controlled Describes systems human commands delivered machines way radio link RF radio frequencypertains systems generate electromagnetic radiations ra dio frequencies RFI fradio frequency interferenceany elec tromagnetic radiation degrades radio link RC system RXradio receiver XM7Rradio transmitter XTAL sometimes XTL crystalcommon frequency-determining element XMTR RX Battery/Smith Continued page 36 Making use dual battery system relatively simple does entail adding negative positive lead receiver connector supply current Generally existing power connector built receiver can used servo power supply receivers experience Great Performance Quartet x DALOTEL 850 SPAN 69 InsWING AREA 830 sq ins U SPAN 76 EXTRA 230 WING AREA 900 sq ins series Sport Scale Balsa ARF Airplanes 120-4 cycle equivalent motors available direct select hobby shops - ZEMPRO MARKETING I- PO BOX 3076 OAK RIDGE TN 37830 PHONE 6154826188 January 1989 153 CHIPMUNK 850 SPAN 70 insWING AREA 850 sq ins ZLIN 526 SPAN 72 insWING AREA 900 sq ins GAS OR ELECTRIC COMING SOON PAONTO 40&604/ SEE YOUR DEA LER PUP 40 TRAINER SPORT J-3 PLAYMATE SUPER PLAYMATE 40 L PLAYMATE ELECTRIC50 SPAR WATCR POE MORE2025 AR Rdewater Hobby Enterprises R II 4lct SRPIELDPL 32691V4I%JnRDAVED 2025 $5495 2454653MC/VIUA4 GRAs VINTAGE FORSTER ENGINES Using original casting dies lastest computer controlled machin ery RJL producing highest quality lowest priced vintage engines available Both engines come complete original reprinted box literature Ignition version equipped clear plastic tank single speed Forster timer Both engines perfect SAM Old Time Stunt events Delivery Dec 88 glow Mar 89 ignition Satisfaction Guaranteedl Add $300 per engine shipping handling Calif residents add sales tax Glow plug spark plug coil condenser included RJL INDUSTRIES PO Box 5 Sierra Madre CA 91024 818 3590016 154 Model Aviation positive negative voltage servo connector bussed along printed wiring board track easily traceable printed circuit board positive voltage source feeds receiver via printed circuit track necessary cut track between last servo connector bus first component re ceiver board order receiver have its own battery recommend using deans connectors easily soldered have goldplated pins Most radios have connectors cannot unsoldered things could get involved youre handy sol dering iron unfamiliar basic electronics dont attempt operation yourself Seek assistance Another consider ation radio new under war ranty may want conimit permanent alterations Its something think about dual battery scheme has benefited radio systems date youve iden tified glitching due voltage dropoff problem do-it-yourself rem edy well worth considering Perhaps future well see radios Giant Scale air planes built wayor offered alter native standard radio Until will have modify own RC Giant Scale/de Vries Continued page 39 wings trailing edge another strip 1A6 ply wood smooth continuous airfoil section Although sounds complicated Mr Fowlers model Fowler flap mechanism actually beauti fully simple very reliable operation Check drawings carefully adapt model back noted effect broken props radiosWe told sad tale two Giants bit dust because excess engine vibration ren dered servos impotent New friend Warren Spur geon called during month similar tale woe model flying coin cidentally Ziroli P-40 bird flew beautiful lycompletely aerobatic stable rock power plant Zenoah G-62 therein lies tale boring skillful holes sky Warren realized didnt have control Warhawk realization confirmed model proceeded powder itself against unyielding earth onfield post-mortem revealed nothing would have caused accident Despite fact retracts salvageable major component beside radio survive impact radio seemed function properly r very careful examination engine told story far Warren concerned Hidden side prop drive assembly locknut parently come adrift allowing flywheel slip forward tapered prop shaft slippage severely unbalanced engine tendant severe vibrationsevere enough render RC servos unable control mod el Warren reported tapered prop shaft visibly chafed sort failure difficulteven impossibleto predict Partial disassembly engine make sure everything locked up tight possible corrective action could come up Maybe jiggle flywheel might have revealed loose locknut could have come loose air after checked What omnipresent Mur phy author well-known laws bear name time/dollar investment Giant Scale models Mr Spurgeons experience points up safety rule great force Check everything before crank up seems Pat Corderman Cordys Flying Circus 1502 N Prospect Colorado Springs CO 80907 designer/producer spectacular fiberglass Northrop Gamma kit column Oc tober 1988 may have solved park-bench al leron problem Earlier prototypes model avoided sexy Scale touch since Pat test pilot Jack Cole feared its use might lead aileron flutter Pat has designed built new wing park-benchers flight testing cur rently underway Gammas used above-the-wing ailerons also almost-fullspan split flaps Pats duplicated well Hes also working next kitting effort Itll Ed Carrolls giant Wily Coyote will feature all-fiberglass fuselage Although Coyote biggie may flown anything nose 90 up event prototype Pats Coyote kit should flying read column Back next month photos news about some very interesting Giant birds Ikon Northwest responding advertisers mention read about ModelAviation Super pLaymale 60 60 SERRES HAS 64 SER4IUYMEThICALALUMINIR4 MAIN OEARPUEL TARE 45602 CYCLE AND MOTOR MOUNT ALL RE 48904 CYCLE $109952 Hour frame op kAts 25 sloe
Edition: Model Aviation - 1989/01
Page Numbers: 36, 153, 154
Continued page 153 Dual Batter y System EJerry Smith Radio installations require lots servos control model may experience own unique form glitching nifty mod receivers solves problem enhances system stability DO YOU FLY Giant Scale airplanes Are rent increased demand current tery pack came system running multiple servos experienc- causes momentary voltage drop ripple since draws very little current can ing some glitching radio Could through entire systemand receiv- fitted smaller pack 250 mAh youre short battery power Some er sensing low voltage temporarily los- less servos other hand modelers like use six seven servo func- es sensitivity During split-second loss powered hefty 1500 mAh pack tionsand top off double up sensitivity receiver sends glitch power supply has its own switch some servos increase power added servos resulting twitch can charging jack safety means its possible wind up seen control surfaces situa- Now servos move receiver eight nine servos airplane tion becomes pronounced doesnt sense voltage drop because its radio system servos battery flat part dis- independent power source unaffected sitting idle drawing small fixed charge curve servos meantime have suffi amount current command dual battery system provides way cient power slight voltage drop given stick transmitter moved around problem system re- system will interfere performa servo several servos respond mov- ceiver powered separately ser- ance ing drawing significantly cur- vos can powered original bat I i - PRINTED Left A typical Alrtronics receiver shown after positive voltage track receiver has cut Most circuit board tracks coated material must scraped away before wire can soldered Right Airtronics receiver uses typical bus track supply current servo connectors track will cut far right just after last servo connectors photos author Left The World Engines Expert receiver can easily converted dual-battery system lead supplying receiver voltage shown sol dered place Jerry recommends using Deans connectors because easy solder Dont forget shrink tubing over solder joints Right World Engines receiver completely modified thats left plug two battery packs two switch harnesses 36 Model Aviation Seagull/Byrum Continued page 149 presents no special problems parts should carefully sanded primed before assembly stringers canopy used basswood available railroad section hobby shop After covering priming fuselage finishing cockpit interior canopy glazed 015 clear plastic Sig Wil holds RC-56 very good adhesive taching canopy stabilizer fin covered Parsons brand fiberglass before being joined fuselage Glass cloth also used wing fairing interplane struts wheel pants wooden surface covered fabric Dan Parsons has very good set instructions will send cloth method much easier infinitely lighter old poly ester method Open framework should covered Super Coverite primed nitrate dope sprayed avoid brush stroke marks used Sig Superoote clear nitrate dope followed col ored butyrate dope Apply several coats rub down steel wool magnet will remove small steel particles re main Supercote silver particularly tractive color heavily pigmented Before flying model check radio power off engine running full throffle good practice also make power check using smaller prop youll flying ap proximates in-flight higher rpm 25 lb Seagull takes off about 100 ft no wind Rudder response dur ing takeoff very good launches smooth graceful landing technique try hold foot off runway ap plying more up elevator air plane slows down until finally settles itself dont always succeed I get nice landing interest encouragement Bill Winter acknowledged appreciated Also advice library staff National Aviation Space Museum Washington DC very helpful lads very very knowledgeable helped make day spent doing re search Seagull best life written Seagull 25 flights flight emo tional experience Hope enjoy yours well Radio Technique/Myers Continued page 35 AMA Academy Model Aeronautics National organization aeromodelers member NAA representative United States America negotiations world pub lisher Model Aviation magazine EAA Experimental Aircraft Association National organization builders homemade man-carrying aircraft Frequent users RC mod els investigate verify performance air craft designs EC Executive CouncilGovermng body AMA consisting President Executive Vice-President Executive Director 11 Dis trict Vice-Presidents FAA Federal Aviation Administrationpart US Federal Government charged regulating transportation use air above nation FAI Federation Aeronautique Internationale Organization oversees coordinates aerospace competitions records based Paris France FC Frequency CommitteeAdvisory body AMA Executive Council matters pertain ing obtaining using radio frequencies hobby purposes FCC Federal Communications Commission part US Federal Government charged regulating radio frequency transmissions FM frequency modulationa system im pressing information radio frequency trans mission adding information moves assigned radio frequency intelligible man ner FSK frequency-shift keyinga system im pressing information radio frequency trans mission shifting between two radio frequen cies intelligible manner system actually used RC systems described FM systems HQ headquartersin case AMA lo cated 1810 Samuel Morse Drive Reston VA 22090 NAA National Aeronautic Association members include EAA AMA other US aviation associations US national aero club recognized FAI PC printed circuita method connecting electronic components etched copper foil path ways PCM pulse-code modulationa system encoding modulation radio frequency use computer words can decoded control commands computer receiver PWM pulse-width modulationa system encoding modulation radio frequency uses time between pulses analog desired control position system common system years 1969-1988 RC sometimes RIC radio-controlled Describes systems human commands delivered machines way radio link RF radio frequencypertains systems generate electromagnetic radiations ra dio frequencies RFI fradio frequency interferenceany elec tromagnetic radiation degrades radio link RC system RXradio receiver XM7Rradio transmitter XTAL sometimes XTL crystalcommon frequency-determining element XMTR RX Battery/Smith Continued page 36 Making use dual battery system relatively simple does entail adding negative positive lead receiver connector supply current Generally existing power connector built receiver can used servo power supply receivers experience Great Performance Quartet x DALOTEL 850 SPAN 69 InsWING AREA 830 sq ins U SPAN 76 EXTRA 230 WING AREA 900 sq ins series Sport Scale Balsa ARF Airplanes 120-4 cycle equivalent motors available direct select hobby shops - ZEMPRO MARKETING I- PO BOX 3076 OAK RIDGE TN 37830 PHONE 6154826188 January 1989 153 CHIPMUNK 850 SPAN 70 insWING AREA 850 sq ins ZLIN 526 SPAN 72 insWING AREA 900 sq ins GAS OR ELECTRIC COMING SOON PAONTO 40&604/ SEE YOUR DEA LER PUP 40 TRAINER SPORT J-3 PLAYMATE SUPER PLAYMATE 40 L PLAYMATE ELECTRIC50 SPAR WATCR POE MORE2025 AR Rdewater Hobby Enterprises R II 4lct SRPIELDPL 32691V4I%JnRDAVED 2025 $5495 2454653MC/VIUA4 GRAs VINTAGE FORSTER ENGINES Using original casting dies lastest computer controlled machin ery RJL producing highest quality lowest priced vintage engines available Both engines come complete original reprinted box literature Ignition version equipped clear plastic tank single speed Forster timer Both engines perfect SAM Old Time Stunt events Delivery Dec 88 glow Mar 89 ignition Satisfaction Guaranteedl Add $300 per engine shipping handling Calif residents add sales tax Glow plug spark plug coil condenser included RJL INDUSTRIES PO Box 5 Sierra Madre CA 91024 818 3590016 154 Model Aviation positive negative voltage servo connector bussed along printed wiring board track easily traceable printed circuit board positive voltage source feeds receiver via printed circuit track necessary cut track between last servo connector bus first component re ceiver board order receiver have its own battery recommend using deans connectors easily soldered have goldplated pins Most radios have connectors cannot unsoldered things could get involved youre handy sol dering iron unfamiliar basic electronics dont attempt operation yourself Seek assistance Another consider ation radio new under war ranty may want conimit permanent alterations Its something think about dual battery scheme has benefited radio systems date youve iden tified glitching due voltage dropoff problem do-it-yourself rem edy well worth considering Perhaps future well see radios Giant Scale air planes built wayor offered alter native standard radio Until will have modify own RC Giant Scale/de Vries Continued page 39 wings trailing edge another strip 1A6 ply wood smooth continuous airfoil section Although sounds complicated Mr Fowlers model Fowler flap mechanism actually beauti fully simple very reliable operation Check drawings carefully adapt model back noted effect broken props radiosWe told sad tale two Giants bit dust because excess engine vibration ren dered servos impotent New friend Warren Spur geon called during month similar tale woe model flying coin cidentally Ziroli P-40 bird flew beautiful lycompletely aerobatic stable rock power plant Zenoah G-62 therein lies tale boring skillful holes sky Warren realized didnt have control Warhawk realization confirmed model proceeded powder itself against unyielding earth onfield post-mortem revealed nothing would have caused accident Despite fact retracts salvageable major component beside radio survive impact radio seemed function properly r very careful examination engine told story far Warren concerned Hidden side prop drive assembly locknut parently come adrift allowing flywheel slip forward tapered prop shaft slippage severely unbalanced engine tendant severe vibrationsevere enough render RC servos unable control mod el Warren reported tapered prop shaft visibly chafed sort failure difficulteven impossibleto predict Partial disassembly engine make sure everything locked up tight possible corrective action could come up Maybe jiggle flywheel might have revealed loose locknut could have come loose air after checked What omnipresent Mur phy author well-known laws bear name time/dollar investment Giant Scale models Mr Spurgeons experience points up safety rule great force Check everything before crank up seems Pat Corderman Cordys Flying Circus 1502 N Prospect Colorado Springs CO 80907 designer/producer spectacular fiberglass Northrop Gamma kit column Oc tober 1988 may have solved park-bench al leron problem Earlier prototypes model avoided sexy Scale touch since Pat test pilot Jack Cole feared its use might lead aileron flutter Pat has designed built new wing park-benchers flight testing cur rently underway Gammas used above-the-wing ailerons also almost-fullspan split flaps Pats duplicated well Hes also working next kitting effort Itll Ed Carrolls giant Wily Coyote will feature all-fiberglass fuselage Although Coyote biggie may flown anything nose 90 up event prototype Pats Coyote kit should flying read column Back next month photos news about some very interesting Giant birds Ikon Northwest responding advertisers mention read about ModelAviation Super pLaymale 60 60 SERRES HAS 64 SER4IUYMEThICALALUMINIR4 MAIN OEARPUEL TARE 45602 CYCLE AND MOTOR MOUNT ALL RE 48904 CYCLE $109952 Hour frame op kAts 25 sloe