Sport Speed Control

SPORT SPEED Co NTROL Part Sport Speed Control presented September 1999 issue POWER PLATE ASSEMBLY Assembly Power Plate begins accurately fabricating aluminum heat sink Use full-size patterns Power Plate Assembly drawing aid steps follow Its easier saw 1A2 aluminum first double-stick tape scrap 1/ Lite Ply hacking Mark drill five 1/ holes deburr holes edges radius four corners slightly Caution very important component side aluminum plate fully deburred smooth before mounting parts sure aluminum stays flat confirm finished piece matches full-size drawing Cut pc board size simple pc board can etched lines can scored #11 knife copper tracks peeled back sure result closely matches full-size drawing Attach pc hoard heat sink using small amount rnbber-based contact cement sure correctly positioned proper fit remaining components depends use two temporary tape tracks heat sink pc board can drop between Polish copper clean subassembly solvent Carefully assemble / watt resistors four FETs see photo Begin cutting off middle lead four FETs Solder 150 ohm resistor lead N-FET gate leads shown trim off balance gate leads Solder R64 P-FET Q61 gate source leads respectively noting both latter remain full length four resistors must tucked close FET bodies dressed shown properly fit heat sink wary electrostatic discharge EEls particularly susceptible Temporarily mount FETs 1C41 4-40 screws nuts finger tight verifying device leads fall correct locations pc lands Note 1C41 has mica insulator between tab aluminum heat sink mounting screw inside insulating eyelet Adjust parts/leads needed solder device leads pc lands Solder three resistor leads N-PETs common conductor Dress install R44 shown Fabricate two A2 x s solder lugs shown trial-fit place remove Solder D41 anode lead its brass lug motor - wire its lug last step must done carefully allow room Q42 Q43 mounting nuts fit avoid excessive solder flow-out Preshape D41 cathode lead trial-fit lug place Solder D41 cathode lead pc land Trial-install Q42/Q43 lug similar fashion fits okay can reinstall mounting hardware real mounting fastener sequence screw heat sink mica insulator device tab insulator eyelet brass lug #4 spring lock washer hex nut parts peculiar 1C41 Now make sure hardware tightened assure good thermal electrical conduction Strip solder place remaining power wires using sufficiently massive iron permit fast smooth solder flow best done first loading stripped wire solder tinning pc lands reflowing wire lands iron heat pressure Dont overdo heat time pc lands can lift board Install C41 polarized correctly nesting pictured Strip four wire ends testing power connectors will installed later October 1999 71 U Bob Kopski Various steps attaching /8 watt resistors power Field Effect Transistors Work neatly see text Power Plate partially assembled Simple pc board serves tie-Completed Power Plate ready electrical checkout Use tape point block device leads wires etcwrap hold heavy lead wires properly dressed Photos author t3raphic Design Jill Ann Gavanaugh - completes basic assembly Power Plate Clean off excess flux solvent eg acetone use lens inspect assembly absolutely sure no land-to-land shorts Look correct solder icicles sharp corners anywhere might cut through insulation power wires five wires will ultimately interconnect Signal Board Power Plate Dress heavy power wires hold em position tape-inch auto trim tape works well now time test assembly help insure proper operation SSC Signal Board Power Plate wired together Power Plate Checkout Items needed test Power Plate include DMM meter leads mini micro test clips meter leads test probe ends nine-volt battery battery snap connector clip leads attached 47 100 470 Ohm resistors miniclips attached soldered parallel combination 22 uF 63-volt tantalum capacitor 470 Ohm resistor 12-inch length wire 56 K resistor soldered end extra power connector set can mate choice power connectors Hold Power Plate leadswell separatedto nonconducting work surface tape photo illustrates typical test step Begin checkout Power Plate using meter test probes DMM set 2 3 KOhm scale Probe combinations adjacent pc lands including reversing meter leads Confirm no land-to-land shorts meter will generally overrange during test case no reading should less few hundred Ohms meter-dependent Probe mounting tab 1C4 aluminum plate verify no short present Continue testing connecting meter leads two power input wires Reverse lead polarity Connect Ohmmeter two power output leads motor leads above including reversing Any reading will depend heavily meter characteristics because measurement nonlinear circuit pure resistance important thing no reading should less about 100 Ohms Switch DMM 20- 30-volt scale follows 54 0 72 Model Aviation r Plate during typical checkout step Now time find solder shorts other problems Remove temporary tape loop add plastic tape combo pc assy Cover exposed Power Plate conductor areas plastic tape Flip Signal Board onto Power Plate foam tape between Dress everything neatly slip heat-shrink tubing over stack 5OmV02VO2ms Sport Speed Control 1C3 Asymmetric Sawtooth Clock Waveforms Waveform Capture Velleman PC64i Digital Storage Adaptor Probes Bottom Grid 0 Volta Sawtooth Pin 26 0 05 V/Grid Pulse Pin 3 0 2 V/Grid Time Base 02 Milliseconds Per Grid Sport Speed Control Comparison Normal Nonlinear Transfer Curves note power calculated based exponent 25 4 S 0 0 0 00 0 0 4 N S 0 z 5152030405085708055150 Throttle Percentage Li SSC Voltage OutS Normal ESC Power 9 Normal ESC VoltageU SSC Power Connect nine-volt battery negative negative power input lead battery positive 100 Ohm resistor Connect other resistor lead positive input wire Power Plate Connect DMM across 100 Ohm resistor reading should fall between 5 2 volts Connect DMM clip leads across resistor-capacitor parallel combination Power Plate connected above touch R-C-DMM combination between 1C4 1 5 Volt output land negative pc land capacitor positive 1C41 output reading almost exactly 50 volts confirms regulator operation Connect 470 Ohms across output motor leads DMM across resistor should no voltage present Now touch wire/56K lead FET gate side R44 positive terminal battery DMM voltage should jump 6 volts Connect 470 Ohm resistor negative output motor lead negative battery terminal DMM across resistor DMM should read zero volts Touch wire/56K lead negative battery terminal Q61 P-FET gate DMM should read 6 volts above okay disconnect test-related accessories Power Plate has passed preliminary tests ready interconnected Signal Board Final Assembly Place Power Plate Signal Board relative positions shown photos Note five leads Signal Board dressed over components board emerge through board notch Use temporary loop tape hold wires position Dress leads Power Plate trimming length generous side Strip about /s inch insulation wire tin wires Solder ends place Power Plate being careful get wires correct electrical location Use lens inspect connections making sure no wire frays sharp edges etc Use small pieces plastic tape cover over locations Power Plate assembly wire could pressed tight against exposed metal requires several small pieces tape generous point its necessary discuss proper use Battery Eliminator Circuit BEC option testing follows separately powered receiver driver used SSC BEC used Whenever BEC used necessary disable BEC connection easily reversibly done adapter cable such short aileron extension cable positive wire cut adapter cable inserted series SSC-receiver cable allows ground negative signal wires interconnect now Perform simple electrical checkout side-by-side assemblies connecting SSC receiver cable receiver throttle channel LU N C -J -J -J LU C C LU I-J LU 0 -J 0 z 0 C- LU LU C 0 C 0 0 0 I 9 0 0 03 -J U InW 03 ir 0 o00 I- 3 5o fl E ur03 03siw C O3 0 03E 00 C 13 LI U C I--u .- Ii 03 4 U 03 C 0 0 03 03 03 m 03 0 0 01 C 3 03 03 E C 0 m 0 a03 C 4 03 U 03 0 5 03 U U 4 C C 4 j x N 03 03 03 03 U C 0 C 03 -J 0 C 0 03 03 5 C, 03 4 03 03 -J C 03 C 0 0 2 0 0 0n Ork U 0 4 C 3 H I I I II II H-i II II II -F-I II II II II II z 4 0 October1999 73 m w 0 3 3I 3 0 z 0 0 C w C 4 -J w U -J -J 0 w z -J I3 0 U I 0 w I4 -J 3 z 3 -J 4 I3 0 servo driverguided discussion above Set throttle control full off Connect 470 Ohms output leads DIVIIvI resistor resistor dummy motor Connect nine-volt battery negative power input negative wire positive battery lead 47 Ohm resistor Connect other resistor lead positive power input wire immediately confirm zero volts DMM Connect DMM across 47 Ohm resistor voltage should approximately volt okay remove 47 Ohm resistor make direct battery positive input positive connection Reconnect DMM 470 Ohm resistor Advance throttle signal zero BL will go of] verify increasing DMM voltage up 8-9 volts full throttle Adjust R52 CW until full-throttle voltage drops zero will abrupt will require now-familiar /4-1 full turn counterclockwise restore output voltage Remove battery test resistors adhere strips ordinary black plastic electrical tape bottom Signal Board covering completely stick three full-board-length strips /s x 3/ foam wing-saddle tape plastic tape just installed foams adhesive very aggressive plastic tape permits easy removal foam separator PC board needed foam separator sheet will placed between Signal Board emerging five wires Fold Signal Board over same time dressing five wires between plastic foam tapeinsulated Power Plate assembly Cut 25A length 2-inch heat-shrink tubing slip stacked assembly inside tubing Orient tubing two tubing creases placed up-and-down along stack sides tempting Confirm stack shape tightness overlay accuracy lead dress etc looks okay shrink tubing covering gun playing air over sides edges assembly results look good something out location wires pinched etc simply cut off tubing try again step satisfactory use new #11 blade carefully cut circular openings Only $2900 Lights 1 2 giow plugs Wt1O oz 12 V cell lights plugs 9/l6Hxl 3/8Wx2 1/8L Compatible radios point fuly adjustable Remote LED available no extra chargeJHM Aero Engineering Specify type radio plug desired Radtord Circle Glow plug connectors chargers Nicds available etta Ga 30060 Add $200 shipping Ga residents add 7% tax 70-438-7146 Product list prices info available 770-438-9654 Master Card Visa accepted 74 Model Aviation ck F T Magazine Multi-Cylinders Ask DGS 5 Only $49OOl Save $1000 Ask about package deal Nicd battery charger glow plug connector Hook up kit Everything need complete installationl THE BATTERY TOOL field box tool 4 9 cell battery packs Use voltmeter loaded voltmeter check packs charge Use discharge pack read its capacity Unit discharges 300 ma auto shut off 1 lv per Battery Tool $5895 4-pc Universal Cord Set $1595 Add 55 5&H FREE shipping order both JANTRONICS 406 727-3001 bttp//wwwwtpnetIDBEST/jtljantronicshtml over three trimmer resistors allow adjustment parts Install power connectors choice power input motor output leads Sport Speed Control ready final checkout adjustment Final Control Checkout Decide number cells will use Connect ninevolt battery power input connectors using battery leads extra mating power connector sure polarity correct Measure voltage battery terminals t Use value calculate Vtp2b 25 x Vbatt/09 x # cells Connect DMM negative tp 1 positive tp2b test points still accessible through end shrink tubing Adjust R52 read value just calculated disconnect battery meter Note intended cell count six seven change 09 equation 095 allows margin tolerance stackup adjustment can redone time change cell count has calibrated cutoff circuit shut motor down pack voltage equal 09 x number cells effect sets cutoff 09 volts per cell nominal Note pack fewer cells would allow SSC run run very long pack cells would experience deeper discharge need youre using BEC wish use battery cutoff protection simply need expedient simply turn R52 fully counterclockwise access variable power supply calibration can done directly setting supply 09 x # cells 095 x cells connecting power input wires Adjust R52 above can verify operation DMM 470 Ohm resistor output leads output will drop off abruptly power supply lowered through adjusted cutoff value can now verification bench run power system just cold turkey install SSC airplane Always use arming switch between battery SSC use BEC install fuse SSC power input line rather install fuse motor lead use BEC install fuse batteryfuse-arming switch manner Note use BEC receiver powered arming switch well use double-stick VelcroTM Radio Shack 64-2345 mount SSC suggest arrange SSC have trim pots accessible brake lite visible installation position airplane may want touch up adjustments beyond what did during test checkout SSC Now go proudly fly Electric speed control built scratch Remember nonlinear speed control will have feel different other control youre likely have used may want trash others Heres hoping enjoy Sport Speed Control have question comment please write directly circuit design improvement has added SSC since article written necessary modification uses additional part previously shown parts list Its Radio Shack catalog #2 72-1 09 tiny 0] uFd monolithic capacitor connected between gate source leads Q6] similar resistor R64 already shown Bend capacitor leads outward trim about /8 long solder top FET leads last part built place prior installing power wires sure dress capacitor body does project higher Q61 body itself make sure nothing touching cutoff middle drain FET lead No other aspect article affected wish thank good friends fellow E-modelers Hai Pham Bill Smith have built flown offered constructive comment Sport Speed Control early interest easy success allow offer article high confidence its buildability functionality Kopski 25 West End Dr Lansdale PA 19446 Join squadron Brand new squadron markings. Available 1/8 1/6 & 1/4 scales C0V Ckt j Theres always thing new major decals29 works-squadton nisigmas NORTOtAST SCREEN GRAPHICS P0 BOX 304 EAST LOOGMEADOW MA 01028 TEL 413 525-4110 FAX 413-5257794 October1999 75 urwik Jr following Wheels sive Ust Price flyer $ 50w Golden Stare u Sig Golden Golden Ring American @fiBAkromasterTwister Oh State @0 State 00 master 51 span Yak9 Mustang II7 thefollowing U9 /TLliI/ following 35 StuntChoice Fox 15BB CL Hobby FastoersDrodak Control Fox 35 Stunt ls engine ofiset plug bemi headlLinesengine Adhesive ls Sullivan Control Acme Brass Acme Brassvat Price Over $185w HandleFuel Tank List Price Aver Si e5wTCI Price1 2000Fuel Tank Fox 25UBadd $1QwTCI Price

SPORT SPEED Co NTROL Part Sport Speed Control presented September 1999 issue POWER PLATE ASSEMBLY Assembly Power Plate begins accurately fabricating aluminum heat sink Use full-size patterns Power Plate Assembly drawing aid steps follow Its easier saw 1A2 aluminum first double-stick tape scrap 1/ Lite Ply hacking Mark drill five 1/ holes deburr holes edges radius four corners slightly Caution very important component side aluminum plate fully deburred smooth before mounting parts sure aluminum stays flat confirm finished piece matches full-size drawing Cut pc board size simple pc board can etched lines can scored #11 knife copper tracks peeled back sure result closely matches full-size drawing Attach pc hoard heat sink using small amount rnbber-based contact cement sure correctly positioned proper fit remaining components depends use two temporary tape tracks heat sink pc board can drop between Polish copper clean subassembly solvent Carefully assemble / watt resistors four FETs see photo Begin cutting off middle lead four FETs Solder 150 ohm resistor lead N-FET gate leads shown trim off balance gate leads Solder R64 P-FET Q61 gate source leads respectively noting both latter remain full length four resistors must tucked close FET bodies dressed shown properly fit heat sink wary electrostatic discharge EEls particularly susceptible Temporarily mount FETs 1C41 4-40 screws nuts finger tight verifying device leads fall correct locations pc lands Note 1C41 has mica insulator between tab aluminum heat sink mounting screw inside insulating eyelet Adjust parts/leads needed solder device leads pc lands Solder three resistor leads N-PETs common conductor Dress install R44 shown Fabricate two A2 x s solder lugs shown trial-fit place remove Solder D41 anode lead its brass lug motor - wire its lug last step must done carefully allow room Q42 Q43 mounting nuts fit avoid excessive solder flow-out Preshape D41 cathode lead trial-fit lug place Solder D41 cathode lead pc land Trial-install Q42/Q43 lug similar fashion fits okay can reinstall mounting hardware real mounting fastener sequence screw heat sink mica insulator device tab insulator eyelet brass lug #4 spring lock washer hex nut parts peculiar 1C41 Now make sure hardware tightened assure good thermal electrical conduction Strip solder place remaining power wires using sufficiently massive iron permit fast smooth solder flow best done first loading stripped wire solder tinning pc lands reflowing wire lands iron heat pressure Dont overdo heat time pc lands can lift board Install C41 polarized correctly nesting pictured Strip four wire ends testing power connectors will installed later October 1999 71 U Bob Kopski Various steps attaching /8 watt resistors power Field Effect Transistors Work neatly see text Power Plate partially assembled Simple pc board serves tie-Completed Power Plate ready electrical checkout Use tape point block device leads wires etcwrap hold heavy lead wires properly dressed Photos author t3raphic Design Jill Ann Gavanaugh - completes basic assembly Power Plate Clean off excess flux solvent eg acetone use lens inspect assembly absolutely sure no land-to-land shorts Look correct solder icicles sharp corners anywhere might cut through insulation power wires five wires will ultimately interconnect Signal Board Power Plate Dress heavy power wires hold em position tape-inch auto trim tape works well now time test assembly help insure proper operation SSC Signal Board Power Plate wired together Power Plate Checkout Items needed test Power Plate include DMM meter leads mini micro test clips meter leads test probe ends nine-volt battery battery snap connector clip leads attached 47 100 470 Ohm resistors miniclips attached soldered parallel combination 22 uF 63-volt tantalum capacitor 470 Ohm resistor 12-inch length wire 56 K resistor soldered end extra power connector set can mate choice power connectors Hold Power Plate leadswell separatedto nonconducting work surface tape photo illustrates typical test step Begin checkout Power Plate using meter test probes DMM set 2 3 KOhm scale Probe combinations adjacent pc lands including reversing meter leads Confirm no land-to-land shorts meter will generally overrange during test case no reading should less few hundred Ohms meter-dependent Probe mounting tab 1C4 aluminum plate verify no short present Continue testing connecting meter leads two power input wires Reverse lead polarity Connect Ohmmeter two power output leads motor leads above including reversing Any reading will depend heavily meter characteristics because measurement nonlinear circuit pure resistance important thing no reading should less about 100 Ohms Switch DMM 20- 30-volt scale follows 54 0 72 Model Aviation r Plate during typical checkout step Now time find solder shorts other problems Remove temporary tape loop add plastic tape combo pc assy Cover exposed Power Plate conductor areas plastic tape Flip Signal Board onto Power Plate foam tape between Dress everything neatly slip heat-shrink tubing over stack 5OmV02VO2ms Sport Speed Control 1C3 Asymmetric Sawtooth Clock Waveforms Waveform Capture Velleman PC64i Digital Storage Adaptor Probes Bottom Grid 0 Volta Sawtooth Pin 26 0 05 V/Grid Pulse Pin 3 0 2 V/Grid Time Base 02 Milliseconds Per Grid Sport Speed Control Comparison Normal Nonlinear Transfer Curves note power calculated based exponent 25 4 S 0 0 0 00 0 0 4 N S 0 z 5152030405085708055150 Throttle Percentage Li SSC Voltage OutS Normal ESC Power 9 Normal ESC VoltageU SSC Power Connect nine-volt battery negative negative power input lead battery positive 100 Ohm resistor Connect other resistor lead positive input wire Power Plate Connect DMM across 100 Ohm resistor reading should fall between 5 2 volts Connect DMM clip leads across resistor-capacitor parallel combination Power Plate connected above touch R-C-DMM combination between 1C4 1 5 Volt output land negative pc land capacitor positive 1C41 output reading almost exactly 50 volts confirms regulator operation Connect 470 Ohms across output motor leads DMM across resistor should no voltage present Now touch wire/56K lead FET gate side R44 positive terminal battery DMM voltage should jump 6 volts Connect 470 Ohm resistor negative output motor lead negative battery terminal DMM across resistor DMM should read zero volts Touch wire/56K lead negative battery terminal Q61 P-FET gate DMM should read 6 volts above okay disconnect test-related accessories Power Plate has passed preliminary tests ready interconnected Signal Board Final Assembly Place Power Plate Signal Board relative positions shown photos Note five leads Signal Board dressed over components board emerge through board notch Use temporary loop tape hold wires position Dress leads Power Plate trimming length generous side Strip about /s inch insulation wire tin wires Solder ends place Power Plate being careful get wires correct electrical location Use lens inspect connections making sure no wire frays sharp edges etc Use small pieces plastic tape cover over locations Power Plate assembly wire could pressed tight against exposed metal requires several small pieces tape generous point its necessary discuss proper use Battery Eliminator Circuit BEC option testing follows separately powered receiver driver used SSC BEC used Whenever BEC used necessary disable BEC connection easily reversibly done adapter cable such short aileron extension cable positive wire cut adapter cable inserted series SSC-receiver cable allows ground negative signal wires interconnect now Perform simple electrical checkout side-by-side assemblies connecting SSC receiver cable receiver throttle channel LU N C -J -J -J LU C C LU I-J LU 0 -J 0 z 0 C- LU LU C 0 C 0 0 0 I 9 0 0 03 -J U InW 03 ir 0 o00 I- 3 5o fl E ur03 03siw C O3 0 03E 00 C 13 LI U C I--u .- Ii 03 4 U 03 C 0 0 03 03 03 m 03 0 0 01 C 3 03 03 E C 0 m 0 a03 C 4 03 U 03 0 5 03 U U 4 C C 4 j x N 03 03 03 03 U C 0 C 03 -J 0 C 0 03 03 5 C, 03 4 03 03 -J C 03 C 0 0 2 0 0 0n Ork U 0 4 C 3 H I I I II II H-i II II II -F-I II II II II II z 4 0 October1999 73 m w 0 3 3I 3 0 z 0 0 C w C 4 -J w U -J -J 0 w z -J I3 0 U I 0 w I4 -J 3 z 3 -J 4 I3 0 servo driverguided discussion above Set throttle control full off Connect 470 Ohms output leads DIVIIvI resistor resistor dummy motor Connect nine-volt battery negative power input negative wire positive battery lead 47 Ohm resistor Connect other resistor lead positive power input wire immediately confirm zero volts DMM Connect DMM across 47 Ohm resistor voltage should approximately volt okay remove 47 Ohm resistor make direct battery positive input positive connection Reconnect DMM 470 Ohm resistor Advance throttle signal zero BL will go of] verify increasing DMM voltage up 8-9 volts full throttle Adjust R52 CW until full-throttle voltage drops zero will abrupt will require now-familiar /4-1 full turn counterclockwise restore output voltage Remove battery test resistors adhere strips ordinary black plastic electrical tape bottom Signal Board covering completely stick three full-board-length strips /s x 3/ foam wing-saddle tape plastic tape just installed foams adhesive very aggressive plastic tape permits easy removal foam separator PC board needed foam separator sheet will placed between Signal Board emerging five wires Fold Signal Board over same time dressing five wires between plastic foam tapeinsulated Power Plate assembly Cut 25A length 2-inch heat-shrink tubing slip stacked assembly inside tubing Orient tubing two tubing creases placed up-and-down along stack sides tempting Confirm stack shape tightness overlay accuracy lead dress etc looks okay shrink tubing covering gun playing air over sides edges assembly results look good something out location wires pinched etc simply cut off tubing try again step satisfactory use new #11 blade carefully cut circular openings Only $2900 Lights 1 2 giow plugs Wt1O oz 12 V cell lights plugs 9/l6Hxl 3/8Wx2 1/8L Compatible radios point fuly adjustable Remote LED available no extra chargeJHM Aero Engineering Specify type radio plug desired Radtord Circle Glow plug connectors chargers Nicds available etta Ga 30060 Add $200 shipping Ga residents add 7% tax 70-438-7146 Product list prices info available 770-438-9654 Master Card Visa accepted 74 Model Aviation ck F T Magazine Multi-Cylinders Ask DGS 5 Only $49OOl Save $1000 Ask about package deal Nicd battery charger glow plug connector Hook up kit Everything need complete installationl THE BATTERY TOOL field box tool 4 9 cell battery packs Use voltmeter loaded voltmeter check packs charge Use discharge pack read its capacity Unit discharges 300 ma auto shut off 1 lv per Battery Tool $5895 4-pc Universal Cord Set $1595 Add 55 5&H FREE shipping order both JANTRONICS 406 727-3001 bttp//wwwwtpnetIDBEST/jtljantronicshtml over three trimmer resistors allow adjustment parts Install power connectors choice power input motor output leads Sport Speed Control ready final checkout adjustment Final Control Checkout Decide number cells will use Connect ninevolt battery power input connectors using battery leads extra mating power connector sure polarity correct Measure voltage battery terminals t Use value calculate Vtp2b 25 x Vbatt/09 x # cells Connect DMM negative tp 1 positive tp2b test points still accessible through end shrink tubing Adjust R52 read value just calculated disconnect battery meter Note intended cell count six seven change 09 equation 095 allows margin tolerance stackup adjustment can redone time change cell count has calibrated cutoff circuit shut motor down pack voltage equal 09 x number cells effect sets cutoff 09 volts per cell nominal Note pack fewer cells would allow SSC run run very long pack cells would experience deeper discharge need youre using BEC wish use battery cutoff protection simply need expedient simply turn R52 fully counterclockwise access variable power supply calibration can done directly setting supply 09 x # cells 095 x cells connecting power input wires Adjust R52 above can verify operation DMM 470 Ohm resistor output leads output will drop off abruptly power supply lowered through adjusted cutoff value can now verification bench run power system just cold turkey install SSC airplane Always use arming switch between battery SSC use BEC install fuse SSC power input line rather install fuse motor lead use BEC install fuse batteryfuse-arming switch manner Note use BEC receiver powered arming switch well use double-stick VelcroTM Radio Shack 64-2345 mount SSC suggest arrange SSC have trim pots accessible brake lite visible installation position airplane may want touch up adjustments beyond what did during test checkout SSC Now go proudly fly Electric speed control built scratch Remember nonlinear speed control will have feel different other control youre likely have used may want trash others Heres hoping enjoy Sport Speed Control have question comment please write directly circuit design improvement has added SSC since article written necessary modification uses additional part previously shown parts list Its Radio Shack catalog #2 72-1 09 tiny 0] uFd monolithic capacitor connected between gate source leads Q6] similar resistor R64 already shown Bend capacitor leads outward trim about /8 long solder top FET leads last part built place prior installing power wires sure dress capacitor body does project higher Q61 body itself make sure nothing touching cutoff middle drain FET lead No other aspect article affected wish thank good friends fellow E-modelers Hai Pham Bill Smith have built flown offered constructive comment Sport Speed Control early interest easy success allow offer article high confidence its buildability functionality Kopski 25 West End Dr Lansdale PA 19446 Join squadron Brand new squadron markings. Available 1/8 1/6 & 1/4 scales C0V Ckt j Theres always thing new major decals29 works-squadton nisigmas NORTOtAST SCREEN GRAPHICS P0 BOX 304 EAST LOOGMEADOW MA 01028 TEL 413 525-4110 FAX 413-5257794 October1999 75 urwik Jr following Wheels sive Ust Price flyer $ 50w Golden Stare u Sig Golden Golden Ring American @fiBAkromasterTwister Oh State @0 State 00 master 51 span Yak9 Mustang II7 thefollowing U9 /TLliI/ following 35 StuntChoice Fox 15BB CL Hobby FastoersDrodak Control Fox 35 Stunt ls engine ofiset plug bemi headlLinesengine Adhesive ls Sullivan Control Acme Brass Acme Brassvat Price Over $185w HandleFuel Tank List Price Aver Si e5wTCI Price1 2000Fuel Tank Fox 25UBadd $1QwTCI Price