Radk Technique Geoige M Myers BASED ON THE dozens letters phone calls visits have received since publication January 1976 issue must few hundred members have built Corleys Critical Voltage Indicator CVI having problems col umn directed Lets begin saying CVI works time Ive oppor tunity examine wouldnt built wrong common mistakes reversed diodes improperly con nected UJTs 82-ohm resistors 82K Grey Red Orange belongs So still have some components work lets go thing systematically Begin four new flashlight batteries Connect nose-to-tail series string short wire intersection provide power supply tapped 6 volts Fig Take LED connect esnt light exchange connections Wrap piece tape around lead connected 3 LED glowing mark Bl Fig 2 Now take diode switching diode such 1N9 14 can substituted 1N4009 insert between LED 3 lead power supply LED stops glowing reverse diode connections Mark diode lead connec ted LED glowing E Fig 3 Set diode aside take up UJT Since article written Radio Shack has discontinued 276-111 may have use Motorola HEP No 310 S9002 can obtained electronic supply houses like Lafay ette Radio Electronics Corp 111 Jericho Turnpike Syosset NY 11791 Spread UJT leads can connect lead 3 another LED LED lights mark lead 3 E Fig 4 LED doesnt light EZ7 1 3 FIG 4 UJT TEST keep switching UJT leads around until does mark E lead Now its time test oscillator As semble components shown Fig 5 LED should flashing ex change unmarked leads UJT Mark UJT lead connected LED flashing tape marked B 1 have tried six combinations LED wont flash may have 8-MFD capacitor connected back wards cant find 8-MFD capa citor use 5 10 end marked ld connected E lead tho UJT shown connections point should have made dots solder clips com ponent leads should have cut point ready assemble CVI piece plastic perforated board Fig 6 typical setup Push component leads through board make up connections other side insulating wires plastic tubing spaghetti necessary complete connect 48 VDC wire 45 lead power supply ust potentiometer point LED just shifts bright steady glow dimmer flashing glow Check work shifting 48 VDC wire 6 lead should get bright steady glow CVI now ready use Connect unused channel receiver lead airborne sys tem switch assembly continued page 84 April1976 9 FLASHING NI FIG 5 OSCILLATOR TEST -TI----FIG 3 DIODE TEST tIZ 6 45 3 tI FIG 1 TAPPED POWER SUPPLY Center Terminal hlight battery PIG 6 TYPICAL CVI could lot smaller size easy trouble-shoot repair necessary c 82K B2 w E OQUJT z1N4009 w81 8MFDSLED lOVOC VOLTS FIG 6A CRITICAL VOLTAGE INDICATOR S L Corley IT----3 TO 81 IL FIG 2 LED TEST * THIN RIGID BLADES OF HARD MAPLE WOOD * SUPERBLY FINISHED COMPLETELY FUEL PROOF SPECIAL PRO SERIES 2 FOR RC-FREE FLIGHT CONTROL LINE DIA FITCH 5%3 63 73/n3/n4 B3%456 94677 10466W 78W 106EW0 VA 7 8 116EW 11%67 126 125W 1356 1456 155 164 0W WIDE BLADE EW EXTRA WIDE ALL NEWI SERIES 400 B FOR SPEED & RACING NEW ADVANCED DESIGN TERRIFIC INCREASE IN THRUST & SPEED LEADING SPEED RECORD HOLDER 72 73 74 DIA PITCH 467 45 5 678EV 7566N7/ 10 11 8R99N 87747/ 977A7M 1213 N NARROW U QUE PLANS FOR GAS MODELERS E INCLUDB PATTERNS 42 BoOing P266 $14 ooO. F. 45 Rocing F4$3 P12 59 36 Eokkc Tape DRI $7 47 Coc Bocnk P6-E $15 38 Col 8 Spod XIII $10 47 GoIocnI Fl IC-2 $15 39 Col B Nioopol 11 $9 47 CcIC HnIIdicec $11 - Pp $8 48 Gb Glodiolon $10 0l Boo K $9 49 S 0oy4e 9Th$10 FB12B&C $11 50 PoIjI Plc P6$10 III Snonl 59 82 Slinon SW 087 $10 Pc 7F1 $11 57 Car 0lE Falcon 515 Macan MBl$14 57 CocSO3C1 Sno $14 57 Kononnc TninTo189 SE Boeing 89 BncIer$9 61 AEGGIVBOnIbO$17 6$ 009 038 CBS $12 66 Coo 02 Boo lit $10 62 0 Skyrocknl F5Pl $14 107 940dm 9481 $20 87 Lnd Lock Sic, $12 54 Sapec Spillico$13 MANS MANY MORE Radio Technique/Myers continued page 9 C M Duffield Thomaston Tex pointed out UJT temperature sensitive true Fig 7 shows effect temperature three devices study carefully will obtain enough information guide decisions about using devices first thing will notice addition Flight Lite made Advanced Devices Inc PO Box 152 Rockville Md 20850 first read Flyer newsletter PGRCC purchased Deluxe 48 Volt model $995 can buy standard model no plugs $695 unit weighs 2 grams fits drilled meas ures iameter X long An LED sticks out end pigtails connecting system stick out other switches bright steady glow extinction switching voltage Power-CYT virtually unaffected temperature effect Flight Lite small flashing range Corleys CVI quite broad low tem peratures very narrow high tern6 5 44 4 U F-J 0 3 320 2I 12 0 750 2 12 0 1350 12 0 FLIGHT LITE peratures Note numbers chart current drawn milliam peres proportional brightness brightness CVI changes 41 across flashing range low level range starts 4 volts irrespective tem perature Some people have expressed concern amount current drawn devices integrate current drawn over discharge time bat tery pack service will see power consumed order 5% available power Most people will stop fly ing 30% 50% battery power still pack just because dont know what have basis de vices extend flying time Thanks Bob Petrinec Power-CYT ex plan ation responses column far would seem want little elec tronic gadgets build simplified ex planations traditional RC techniques like bolt sizes propeller sizes hinging installations etc want something else address George M Myers 70 Froehlich Farm Road Hicksville NY 11801 320750 j350 4045 HDD 00 POWER- CYT FLASHING RANGE NUMBERS IN BOXES ARE MILLIAMPS AND SHOW RELATIVE BRIGHTNESS Man Power/Berliner continued page 14 tandem-wing arrangement re duces critical over-all wingspan slave/pilot combination steadily gaining popularity strangely curled-up wingtips designed control tip vortices may worth trouble build Dimensions Wingspan front wing 65 rear wing 80 length 19 wing area front wing 250 sq ft rear wing 300 sq ft 320 41 30 7 750 42 6 350 43 20 5 O00 CORLEY CVI empty weight 167 lbs flying weight 467 lbs Airfoil both wings Wortman FX-67K-170 Estimated cruising speed 22 mph Goodhart unusual design handiwork Rear Adm Nick Goodhart Royal Navy great men British sailplane move ment idea reduce induced drag much possible developing airplane can flown within 11/2 feet 84 Model Aviation HIGH PERFORMANCE * COMPETITION PROVEN ASK yOUR DEALER TEMPERATURE RESPONSES OF SAMPLE VOLTAGE -INDICATING PILOT LIGHTS QUICKEST MAIL SERVICE
Edition: Model Aviation - 1976/04
Page Numbers: 9, 84
Radk Technique Geoige M Myers BASED ON THE dozens letters phone calls visits have received since publication January 1976 issue must few hundred members have built Corleys Critical Voltage Indicator CVI having problems col umn directed Lets begin saying CVI works time Ive oppor tunity examine wouldnt built wrong common mistakes reversed diodes improperly con nected UJTs 82-ohm resistors 82K Grey Red Orange belongs So still have some components work lets go thing systematically Begin four new flashlight batteries Connect nose-to-tail series string short wire intersection provide power supply tapped 6 volts Fig Take LED connect esnt light exchange connections Wrap piece tape around lead connected 3 LED glowing mark Bl Fig 2 Now take diode switching diode such 1N9 14 can substituted 1N4009 insert between LED 3 lead power supply LED stops glowing reverse diode connections Mark diode lead connec ted LED glowing E Fig 3 Set diode aside take up UJT Since article written Radio Shack has discontinued 276-111 may have use Motorola HEP No 310 S9002 can obtained electronic supply houses like Lafay ette Radio Electronics Corp 111 Jericho Turnpike Syosset NY 11791 Spread UJT leads can connect lead 3 another LED LED lights mark lead 3 E Fig 4 LED doesnt light EZ7 1 3 FIG 4 UJT TEST keep switching UJT leads around until does mark E lead Now its time test oscillator As semble components shown Fig 5 LED should flashing ex change unmarked leads UJT Mark UJT lead connected LED flashing tape marked B 1 have tried six combinations LED wont flash may have 8-MFD capacitor connected back wards cant find 8-MFD capa citor use 5 10 end marked ld connected E lead tho UJT shown connections point should have made dots solder clips com ponent leads should have cut point ready assemble CVI piece plastic perforated board Fig 6 typical setup Push component leads through board make up connections other side insulating wires plastic tubing spaghetti necessary complete connect 48 VDC wire 45 lead power supply ust potentiometer point LED just shifts bright steady glow dimmer flashing glow Check work shifting 48 VDC wire 6 lead should get bright steady glow CVI now ready use Connect unused channel receiver lead airborne sys tem switch assembly continued page 84 April1976 9 FLASHING NI FIG 5 OSCILLATOR TEST -TI----FIG 3 DIODE TEST tIZ 6 45 3 tI FIG 1 TAPPED POWER SUPPLY Center Terminal hlight battery PIG 6 TYPICAL CVI could lot smaller size easy trouble-shoot repair necessary c 82K B2 w E OQUJT z1N4009 w81 8MFDSLED lOVOC VOLTS FIG 6A CRITICAL VOLTAGE INDICATOR S L Corley IT----3 TO 81 IL FIG 2 LED TEST * THIN RIGID BLADES OF HARD MAPLE WOOD * SUPERBLY FINISHED COMPLETELY FUEL PROOF SPECIAL PRO SERIES 2 FOR RC-FREE FLIGHT CONTROL LINE DIA FITCH 5%3 63 73/n3/n4 B3%456 94677 10466W 78W 106EW0 VA 7 8 116EW 11%67 126 125W 1356 1456 155 164 0W WIDE BLADE EW EXTRA WIDE ALL NEWI SERIES 400 B FOR SPEED & RACING NEW ADVANCED DESIGN TERRIFIC INCREASE IN THRUST & SPEED LEADING SPEED RECORD HOLDER 72 73 74 DIA PITCH 467 45 5 678EV 7566N7/ 10 11 8R99N 87747/ 977A7M 1213 N NARROW U QUE PLANS FOR GAS MODELERS E INCLUDB PATTERNS 42 BoOing P266 $14 ooO. F. 45 Rocing F4$3 P12 59 36 Eokkc Tape DRI $7 47 Coc Bocnk P6-E $15 38 Col 8 Spod XIII $10 47 GoIocnI Fl IC-2 $15 39 Col B Nioopol 11 $9 47 CcIC HnIIdicec $11 - Pp $8 48 Gb Glodiolon $10 0l Boo K $9 49 S 0oy4e 9Th$10 FB12B&C $11 50 PoIjI Plc P6$10 III Snonl 59 82 Slinon SW 087 $10 Pc 7F1 $11 57 Car 0lE Falcon 515 Macan MBl$14 57 CocSO3C1 Sno $14 57 Kononnc TninTo189 SE Boeing 89 BncIer$9 61 AEGGIVBOnIbO$17 6$ 009 038 CBS $12 66 Coo 02 Boo lit $10 62 0 Skyrocknl F5Pl $14 107 940dm 9481 $20 87 Lnd Lock Sic, $12 54 Sapec Spillico$13 MANS MANY MORE Radio Technique/Myers continued page 9 C M Duffield Thomaston Tex pointed out UJT temperature sensitive true Fig 7 shows effect temperature three devices study carefully will obtain enough information guide decisions about using devices first thing will notice addition Flight Lite made Advanced Devices Inc PO Box 152 Rockville Md 20850 first read Flyer newsletter PGRCC purchased Deluxe 48 Volt model $995 can buy standard model no plugs $695 unit weighs 2 grams fits drilled meas ures iameter X long An LED sticks out end pigtails connecting system stick out other switches bright steady glow extinction switching voltage Power-CYT virtually unaffected temperature effect Flight Lite small flashing range Corleys CVI quite broad low tem peratures very narrow high tern6 5 44 4 U F-J 0 3 320 2I 12 0 750 2 12 0 1350 12 0 FLIGHT LITE peratures Note numbers chart current drawn milliam peres proportional brightness brightness CVI changes 41 across flashing range low level range starts 4 volts irrespective tem perature Some people have expressed concern amount current drawn devices integrate current drawn over discharge time bat tery pack service will see power consumed order 5% available power Most people will stop fly ing 30% 50% battery power still pack just because dont know what have basis de vices extend flying time Thanks Bob Petrinec Power-CYT ex plan ation responses column far would seem want little elec tronic gadgets build simplified ex planations traditional RC techniques like bolt sizes propeller sizes hinging installations etc want something else address George M Myers 70 Froehlich Farm Road Hicksville NY 11801 320750 j350 4045 HDD 00 POWER- CYT FLASHING RANGE NUMBERS IN BOXES ARE MILLIAMPS AND SHOW RELATIVE BRIGHTNESS Man Power/Berliner continued page 14 tandem-wing arrangement re duces critical over-all wingspan slave/pilot combination steadily gaining popularity strangely curled-up wingtips designed control tip vortices may worth trouble build Dimensions Wingspan front wing 65 rear wing 80 length 19 wing area front wing 250 sq ft rear wing 300 sq ft 320 41 30 7 750 42 6 350 43 20 5 O00 CORLEY CVI empty weight 167 lbs flying weight 467 lbs Airfoil both wings Wortman FX-67K-170 Estimated cruising speed 22 mph Goodhart unusual design handiwork Rear Adm Nick Goodhart Royal Navy great men British sailplane move ment idea reduce induced drag much possible developing airplane can flown within 11/2 feet 84 Model Aviation HIGH PERFORMANCE * COMPETITION PROVEN ASK yOUR DEALER TEMPERATURE RESPONSES OF SAMPLE VOLTAGE -INDICATING PILOT LIGHTS QUICKEST MAIL SERVICE