a loec ni ue George M Myers THIS MONTH want talk about reader letters useful gadgets just parenthetical remark photo caption pg 42 MA December 1983 seems have attracted some interest refer use steel replacement plastic clutch Circus Hobbies Baron 20 Heli copter As write magazine has distribution week yet have already received two letters cou ple phone calls subject steel clutch made lathe drillpress saw dont have need friend machine shop desire helpful Perhaps could make acquaintance shop instructor local high school would make clutch show project Adult Education have included dimensioned sketch steel clutch does wonders lower ing idle rpm addition promoting smoothness engine operation built-in spring will deform operating tem perature clutch therefore clutch action will reliable repeatable experience has plastic clutch will overheat its spring will lose its shape clutch will rub exces sively during long walk pits helipad result another melted plastic clutch glues itself drive drum have several such clutches show anyone wishes argue point Using steel clutch flew summer two gallons fuel went through OS 28H-FSR have now single problem related clutch People saw machine amazed way would sit idle rotor blades turning long fuel tank am sold benefits steel clutch People often ask get idle like Adjusting 05 28 simple once know OS structions quite clear correct problems start attach engine Helicopter clutch drags slightly engine becomes balky Fuel another concern want least 15% nitromethane Find brand engine likes stick Using old fuel and/or changing fuel type brings headaches youve got straight can start adjustments 1 Turn High Speed needle valve way back out two turns leave alone has almost no influence anyway will have discovered now George has Helicoptering again wants pass some good tips Improve Baron 20 Photo top right shows OS 28H power plantnote air cleaner steel clutch RC Helicopters live sea dust dirtthis reaiiy tough engines Bru-Line air cleaner above keeps Inside engine clean free scratches Bru-Line Industries Inc PO Box 3786 Center Line Ml 48015 two drawings right below show very successful mod standard Baron clutch Idle greatly Improved pre cision engagementldisengagement No wont make Theres lots column too should 001 to002 radial clearance between inside bell-housing liner steel clutchthats about thick ness thin sheet paper bell-housing liner hunk used belt belt-sander Attach Dow Corning RTV 3145 Tub Seal 2 Strap helicopter picnic table similar firm mount can have both hands free work engine running rotor system spin ning Wear safety glasses hard hat keep body away moving parts 3 Start engine way can fiddling throttle opening prim ing etc have running dont change anything until has run warm up may will able run throttle setting So Let run setting 4 Next carefully adjust Low Speed needle valve until engine will run wide-open throttle Measure main rotor rpm Adjust collective pitch get 1100 rpm Baron 20 main rotor main rotor rpm should hold essentially constant 1100 rpm way half- full-throttle 5 Stop engine check clutch drag spinning main rotor may have displaced engine hard start Reset clamping bolts neces sary dislike belt-starting engines be0 HOTTIIM VIEW Q 9600 ATERIAL SIEtI C 3022 320il92k r 22 -12e /-roe aoo 900 022000 0250 62 2cOCCI OAo0Tk Z0/O200 2000 CLUTCH BELL-HOUSING M GUi F IC AT ION LINING VIED BOTTOM SIDE VIEW r14 GEAR iI~iINING SPLICE QQ Arr4l AwitiAn 325 DE VIEW ~1~ cause often happens 6 I assume using Belier Mixer Part No KB2AO 1 get use Set linkages levers perpendicular pushrods throttle set Full Trim Half Throttle Levers means levers head well mixer bellcranks sides main frame servo arm Make sure pushrods Pitch Roll Yaw set perpendicular servo arms neutral Some readers may thinking Myers forgot telling us about engine adjustments considering digression pushrods bellcranks Now consider control Helicopter effects load engine Listen engine hover Helicopter feed alternate Left/Right rudder con trols set correctly engine speed wont change Helicopter wont rise/settle photos shows material has uses Plastic Dip thick viscous paint creates rubbery coating materials including foam rubber should wish create waterproof pad ded cell receiver dislike pulling wires servo plugs tiny plugs everyone using days doesnt seem other choice Painting rubber boot around wire/plug intersection will spread load equally reducing tendency fracture wire point exits plug can improve grip chromeplated tools like three-jaw pliers dipping handles directed Being slightly thinner GE Tub-Seal simi lar silicones can paint brush will level itself little curing Multilayer applications permissible Use lacquer thinner thinning cleanup comes bright red yellow know PDI Inc 1458 West County Rd C Saint Paul MN 55113 couple interesting new electronic kits have crossed desk think might like build Ace RC Inc Over nighter 34K50/$2295 constantcurrent charger use automobile select 25 50 90 120 mA charge rate installing appropriate resistors pro vided circuit board done plug mixture transmitters flight packs up four overnight charge Field Fast Charger another Ace product can use youre driving car engine running because constant-current circuit compensates voltage changes automobile caused its charging cir cuit label assigns two charging leads transmitters other two receivers assumption trans mitters require 50 mA charge rate minor modification can ignore designations Just drill two extra holes case can mount Q2 Q3 same way Q 1 Q4 extra heat-sinking obtain will permit draw up 120 mA four outputs Incidently device should perfectly happy charging number cells nine Dont plug anything want charged until have charger plugged source because may light LEDs best bet put switch Off position plug source connect items charged switch unit other way unit may lie Chargeindicating LEDs can light up no charge flowing companion device announced same time Chargemaster 34K55/$3695 Chargemaster will charge two transmitters four flight packs Plastic Dip R very useful makes tough rubbery skin can painted anywhere need resilient seal scuft-proofing better grip strain relief cheap hinge etc George notes can painted foam rubber pad around receiver make waterproof pouch also uses make strain-relief servo connectors below same time makes excellent device Helicopters frequently carry extra flight pack gyro could service two Helicopters time charger feature worth considering Chargemasters provision continuous tricklecharging have read reports say trickle-charging bad Ni-Cds because promotes loss total capacity have also received firsthand reports years tricklecharging obvious ill effect battery-powered handie-talkies soldering irons carving knives etc personal opinion trickle-charging will better RC systems alternative let go flat during long periods inactivity eg Winter let nickle-cadmium batteries sit around discharged condition have tendency develop short circuits growContinued page 132 FiAorh IOQA fl Ace RC Inc Overnighter front charger two nu systems time us designed work cars cigarette-lighter receptacle Chargemaster rear use home features trickle-charging take care long periods inactivity RC systems Electric flight challenge sport flier competitor alike Watts Up introduction should gratifying Happy landings Radio Technique/Myers Continued page 39 ing microscopic whiskers through sulating paper can blow out whis kers high-voltage charge really trust cells afterward dont So away workbench lot Chargemaster may prove fine tool Ace RC Inc Box 51 lE Higginsville MO 64037 George M Myers 70 Froehlich Farm Rd Hicksville NY 11801 [ writing advertisers mention t read about ModI Aviation J-3 has proven over years real crowd pleaserprobably because its good old J-3 fact touches ob servers plane built winter 1978-79 first flown March 3 latter year didnt know till later Bob Boucher Astro Flight design ing Porterfield same time two planes very similar date J-3 has accumulated 334 flights drop oil has soaked 150 depicted Fig 4 Prior 1980 keeping record flight time date number flights thats reason about half plotted Fig 4 obvious five-mm airplane can see vital statistics what details Heres some information about plane J-3 scratch-built using Sig plans guideline Since electricpowered knew plane itself lightweight rugged kit version glow engine would set about redrawing plans choosing construc tion techniques wood sizes consistent application also changed air foil 12/2% flat-bottom section Dihedral added lieu ailerons Result real charmer Admittedly 1-3 fair-weather flier does handle wind well defi nitely fun fly calm air typical flight starts small amount ground handling followed taxi takeoff Fol lowing climb-out back off proportional throttle cruise around Flybys snapbeautiful experience plane pussycat handling several times Ive nearly hypnotized myself flying myself Usually Ill some touch-and-goes two inside loops playing throttle control needed plane glides nicely note some longer lift-assisted flight times Fig 4 generally keep power whole flight varying amount de sired effect About third time have enough power left after landing taxi back pit area Otherwise power out have bring back dead-stick 1-3 good example inadequate battery cooling Im fourth battery heat reason time design construction what looked like good installation cooling has proved adequate Whatever knowledge may have Electrics has come cheaply 15-size motor used plane new version plane new so-called black back 15 current model Astro 15 rather different motor Ferrite 15 uses 12 cells 12 Ah may install someday get longer flights overall weight will increase about 9 oz estimate flight time should increase about 8-9 mm Look over vitals get general idea candidate designs around would perform comparably would require some modeling effort make suitable electric power J-3 example Astro Porterfield 132 Model Aviation Watts Up/MarronElectrics/Kopski Continued page 130 Continued paqe 44 jSSOATES INCNEW MO 13 N IS Dont bee stung AIDS CLOUD WAYHAYWARD CA 945S OS4ONCsalaENYA GUARANTEED CY NO 5310 Os l2O4cy NO 5317 HOT SHOT Hor~US PAT 4405890 Hand held rechargeable glow plug energizer size engine uses gtow plug Small enough carry yoijr shirt pocket Makes dry cell batteries power losing wires thing ot past Easy attachment cowd engines Reinforced extra hard use Can charged upto 1000 times Uses HEAD LOCK glow plug connector MODEL PRODUCTS CORP positive corinec tion tothe glow plug 90 day unconditional guarantee plus limited warranty up year Complete instructions charger Available dealer order direct Visa Mastercard accepted Add Si 50 postage power convenience $1995 Without charger $1595 b & r Hobbies PO Box 192 Oscoda MI 48750 [517] 7393549 Making Leisure Time Enjoyable
Edition: Model Aviation - 1984/03
Page Numbers: 38, 39, 132
a loec ni ue George M Myers THIS MONTH want talk about reader letters useful gadgets just parenthetical remark photo caption pg 42 MA December 1983 seems have attracted some interest refer use steel replacement plastic clutch Circus Hobbies Baron 20 Heli copter As write magazine has distribution week yet have already received two letters cou ple phone calls subject steel clutch made lathe drillpress saw dont have need friend machine shop desire helpful Perhaps could make acquaintance shop instructor local high school would make clutch show project Adult Education have included dimensioned sketch steel clutch does wonders lower ing idle rpm addition promoting smoothness engine operation built-in spring will deform operating tem perature clutch therefore clutch action will reliable repeatable experience has plastic clutch will overheat its spring will lose its shape clutch will rub exces sively during long walk pits helipad result another melted plastic clutch glues itself drive drum have several such clutches show anyone wishes argue point Using steel clutch flew summer two gallons fuel went through OS 28H-FSR have now single problem related clutch People saw machine amazed way would sit idle rotor blades turning long fuel tank am sold benefits steel clutch People often ask get idle like Adjusting 05 28 simple once know OS structions quite clear correct problems start attach engine Helicopter clutch drags slightly engine becomes balky Fuel another concern want least 15% nitromethane Find brand engine likes stick Using old fuel and/or changing fuel type brings headaches youve got straight can start adjustments 1 Turn High Speed needle valve way back out two turns leave alone has almost no influence anyway will have discovered now George has Helicoptering again wants pass some good tips Improve Baron 20 Photo top right shows OS 28H power plantnote air cleaner steel clutch RC Helicopters live sea dust dirtthis reaiiy tough engines Bru-Line air cleaner above keeps Inside engine clean free scratches Bru-Line Industries Inc PO Box 3786 Center Line Ml 48015 two drawings right below show very successful mod standard Baron clutch Idle greatly Improved pre cision engagementldisengagement No wont make Theres lots column too should 001 to002 radial clearance between inside bell-housing liner steel clutchthats about thick ness thin sheet paper bell-housing liner hunk used belt belt-sander Attach Dow Corning RTV 3145 Tub Seal 2 Strap helicopter picnic table similar firm mount can have both hands free work engine running rotor system spin ning Wear safety glasses hard hat keep body away moving parts 3 Start engine way can fiddling throttle opening prim ing etc have running dont change anything until has run warm up may will able run throttle setting So Let run setting 4 Next carefully adjust Low Speed needle valve until engine will run wide-open throttle Measure main rotor rpm Adjust collective pitch get 1100 rpm Baron 20 main rotor main rotor rpm should hold essentially constant 1100 rpm way half- full-throttle 5 Stop engine check clutch drag spinning main rotor may have displaced engine hard start Reset clamping bolts neces sary dislike belt-starting engines be0 HOTTIIM VIEW Q 9600 ATERIAL SIEtI C 3022 320il92k r 22 -12e /-roe aoo 900 022000 0250 62 2cOCCI OAo0Tk Z0/O200 2000 CLUTCH BELL-HOUSING M GUi F IC AT ION LINING VIED BOTTOM SIDE VIEW r14 GEAR iI~iINING SPLICE QQ Arr4l AwitiAn 325 DE VIEW ~1~ cause often happens 6 I assume using Belier Mixer Part No KB2AO 1 get use Set linkages levers perpendicular pushrods throttle set Full Trim Half Throttle Levers means levers head well mixer bellcranks sides main frame servo arm Make sure pushrods Pitch Roll Yaw set perpendicular servo arms neutral Some readers may thinking Myers forgot telling us about engine adjustments considering digression pushrods bellcranks Now consider control Helicopter effects load engine Listen engine hover Helicopter feed alternate Left/Right rudder con trols set correctly engine speed wont change Helicopter wont rise/settle photos shows material has uses Plastic Dip thick viscous paint creates rubbery coating materials including foam rubber should wish create waterproof pad ded cell receiver dislike pulling wires servo plugs tiny plugs everyone using days doesnt seem other choice Painting rubber boot around wire/plug intersection will spread load equally reducing tendency fracture wire point exits plug can improve grip chromeplated tools like three-jaw pliers dipping handles directed Being slightly thinner GE Tub-Seal simi lar silicones can paint brush will level itself little curing Multilayer applications permissible Use lacquer thinner thinning cleanup comes bright red yellow know PDI Inc 1458 West County Rd C Saint Paul MN 55113 couple interesting new electronic kits have crossed desk think might like build Ace RC Inc Over nighter 34K50/$2295 constantcurrent charger use automobile select 25 50 90 120 mA charge rate installing appropriate resistors pro vided circuit board done plug mixture transmitters flight packs up four overnight charge Field Fast Charger another Ace product can use youre driving car engine running because constant-current circuit compensates voltage changes automobile caused its charging cir cuit label assigns two charging leads transmitters other two receivers assumption trans mitters require 50 mA charge rate minor modification can ignore designations Just drill two extra holes case can mount Q2 Q3 same way Q 1 Q4 extra heat-sinking obtain will permit draw up 120 mA four outputs Incidently device should perfectly happy charging number cells nine Dont plug anything want charged until have charger plugged source because may light LEDs best bet put switch Off position plug source connect items charged switch unit other way unit may lie Chargeindicating LEDs can light up no charge flowing companion device announced same time Chargemaster 34K55/$3695 Chargemaster will charge two transmitters four flight packs Plastic Dip R very useful makes tough rubbery skin can painted anywhere need resilient seal scuft-proofing better grip strain relief cheap hinge etc George notes can painted foam rubber pad around receiver make waterproof pouch also uses make strain-relief servo connectors below same time makes excellent device Helicopters frequently carry extra flight pack gyro could service two Helicopters time charger feature worth considering Chargemasters provision continuous tricklecharging have read reports say trickle-charging bad Ni-Cds because promotes loss total capacity have also received firsthand reports years tricklecharging obvious ill effect battery-powered handie-talkies soldering irons carving knives etc personal opinion trickle-charging will better RC systems alternative let go flat during long periods inactivity eg Winter let nickle-cadmium batteries sit around discharged condition have tendency develop short circuits growContinued page 132 FiAorh IOQA fl Ace RC Inc Overnighter front charger two nu systems time us designed work cars cigarette-lighter receptacle Chargemaster rear use home features trickle-charging take care long periods inactivity RC systems Electric flight challenge sport flier competitor alike Watts Up introduction should gratifying Happy landings Radio Technique/Myers Continued page 39 ing microscopic whiskers through sulating paper can blow out whis kers high-voltage charge really trust cells afterward dont So away workbench lot Chargemaster may prove fine tool Ace RC Inc Box 51 lE Higginsville MO 64037 George M Myers 70 Froehlich Farm Rd Hicksville NY 11801 [ writing advertisers mention t read about ModI Aviation J-3 has proven over years real crowd pleaserprobably because its good old J-3 fact touches ob servers plane built winter 1978-79 first flown March 3 latter year didnt know till later Bob Boucher Astro Flight design ing Porterfield same time two planes very similar date J-3 has accumulated 334 flights drop oil has soaked 150 depicted Fig 4 Prior 1980 keeping record flight time date number flights thats reason about half plotted Fig 4 obvious five-mm airplane can see vital statistics what details Heres some information about plane J-3 scratch-built using Sig plans guideline Since electricpowered knew plane itself lightweight rugged kit version glow engine would set about redrawing plans choosing construc tion techniques wood sizes consistent application also changed air foil 12/2% flat-bottom section Dihedral added lieu ailerons Result real charmer Admittedly 1-3 fair-weather flier does handle wind well defi nitely fun fly calm air typical flight starts small amount ground handling followed taxi takeoff Fol lowing climb-out back off proportional throttle cruise around Flybys snapbeautiful experience plane pussycat handling several times Ive nearly hypnotized myself flying myself Usually Ill some touch-and-goes two inside loops playing throttle control needed plane glides nicely note some longer lift-assisted flight times Fig 4 generally keep power whole flight varying amount de sired effect About third time have enough power left after landing taxi back pit area Otherwise power out have bring back dead-stick 1-3 good example inadequate battery cooling Im fourth battery heat reason time design construction what looked like good installation cooling has proved adequate Whatever knowledge may have Electrics has come cheaply 15-size motor used plane new version plane new so-called black back 15 current model Astro 15 rather different motor Ferrite 15 uses 12 cells 12 Ah may install someday get longer flights overall weight will increase about 9 oz estimate flight time should increase about 8-9 mm Look over vitals get general idea candidate designs around would perform comparably would require some modeling effort make suitable electric power J-3 example Astro Porterfield 132 Model Aviation Watts Up/MarronElectrics/Kopski Continued page 130 Continued paqe 44 jSSOATES INCNEW MO 13 N IS Dont bee stung AIDS CLOUD WAYHAYWARD CA 945S OS4ONCsalaENYA GUARANTEED CY NO 5310 Os l2O4cy NO 5317 HOT SHOT Hor~US PAT 4405890 Hand held rechargeable glow plug energizer size engine uses gtow plug Small enough carry yoijr shirt pocket Makes dry cell batteries power losing wires thing ot past Easy attachment cowd engines Reinforced extra hard use Can charged upto 1000 times Uses HEAD LOCK glow plug connector MODEL PRODUCTS CORP positive corinec tion tothe glow plug 90 day unconditional guarantee plus limited warranty up year Complete instructions charger Available dealer order direct Visa Mastercard accepted Add Si 50 postage power convenience $1995 Without charger $1595 b & r Hobbies PO Box 192 Oscoda MI 48750 [517] 7393549 Making Leisure Time Enjoyable
Edition: Model Aviation - 1984/03
Page Numbers: 38, 39, 132
a loec ni ue George M Myers THIS MONTH want talk about reader letters useful gadgets just parenthetical remark photo caption pg 42 MA December 1983 seems have attracted some interest refer use steel replacement plastic clutch Circus Hobbies Baron 20 Heli copter As write magazine has distribution week yet have already received two letters cou ple phone calls subject steel clutch made lathe drillpress saw dont have need friend machine shop desire helpful Perhaps could make acquaintance shop instructor local high school would make clutch show project Adult Education have included dimensioned sketch steel clutch does wonders lower ing idle rpm addition promoting smoothness engine operation built-in spring will deform operating tem perature clutch therefore clutch action will reliable repeatable experience has plastic clutch will overheat its spring will lose its shape clutch will rub exces sively during long walk pits helipad result another melted plastic clutch glues itself drive drum have several such clutches show anyone wishes argue point Using steel clutch flew summer two gallons fuel went through OS 28H-FSR have now single problem related clutch People saw machine amazed way would sit idle rotor blades turning long fuel tank am sold benefits steel clutch People often ask get idle like Adjusting 05 28 simple once know OS structions quite clear correct problems start attach engine Helicopter clutch drags slightly engine becomes balky Fuel another concern want least 15% nitromethane Find brand engine likes stick Using old fuel and/or changing fuel type brings headaches youve got straight can start adjustments 1 Turn High Speed needle valve way back out two turns leave alone has almost no influence anyway will have discovered now George has Helicoptering again wants pass some good tips Improve Baron 20 Photo top right shows OS 28H power plantnote air cleaner steel clutch RC Helicopters live sea dust dirtthis reaiiy tough engines Bru-Line air cleaner above keeps Inside engine clean free scratches Bru-Line Industries Inc PO Box 3786 Center Line Ml 48015 two drawings right below show very successful mod standard Baron clutch Idle greatly Improved pre cision engagementldisengagement No wont make Theres lots column too should 001 to002 radial clearance between inside bell-housing liner steel clutchthats about thick ness thin sheet paper bell-housing liner hunk used belt belt-sander Attach Dow Corning RTV 3145 Tub Seal 2 Strap helicopter picnic table similar firm mount can have both hands free work engine running rotor system spin ning Wear safety glasses hard hat keep body away moving parts 3 Start engine way can fiddling throttle opening prim ing etc have running dont change anything until has run warm up may will able run throttle setting So Let run setting 4 Next carefully adjust Low Speed needle valve until engine will run wide-open throttle Measure main rotor rpm Adjust collective pitch get 1100 rpm Baron 20 main rotor main rotor rpm should hold essentially constant 1100 rpm way half- full-throttle 5 Stop engine check clutch drag spinning main rotor may have displaced engine hard start Reset clamping bolts neces sary dislike belt-starting engines be0 HOTTIIM VIEW Q 9600 ATERIAL SIEtI C 3022 320il92k r 22 -12e /-roe aoo 900 022000 0250 62 2cOCCI OAo0Tk Z0/O200 2000 CLUTCH BELL-HOUSING M GUi F IC AT ION LINING VIED BOTTOM SIDE VIEW r14 GEAR iI~iINING SPLICE QQ Arr4l AwitiAn 325 DE VIEW ~1~ cause often happens 6 I assume using Belier Mixer Part No KB2AO 1 get use Set linkages levers perpendicular pushrods throttle set Full Trim Half Throttle Levers means levers head well mixer bellcranks sides main frame servo arm Make sure pushrods Pitch Roll Yaw set perpendicular servo arms neutral Some readers may thinking Myers forgot telling us about engine adjustments considering digression pushrods bellcranks Now consider control Helicopter effects load engine Listen engine hover Helicopter feed alternate Left/Right rudder con trols set correctly engine speed wont change Helicopter wont rise/settle photos shows material has uses Plastic Dip thick viscous paint creates rubbery coating materials including foam rubber should wish create waterproof pad ded cell receiver dislike pulling wires servo plugs tiny plugs everyone using days doesnt seem other choice Painting rubber boot around wire/plug intersection will spread load equally reducing tendency fracture wire point exits plug can improve grip chromeplated tools like three-jaw pliers dipping handles directed Being slightly thinner GE Tub-Seal simi lar silicones can paint brush will level itself little curing Multilayer applications permissible Use lacquer thinner thinning cleanup comes bright red yellow know PDI Inc 1458 West County Rd C Saint Paul MN 55113 couple interesting new electronic kits have crossed desk think might like build Ace RC Inc Over nighter 34K50/$2295 constantcurrent charger use automobile select 25 50 90 120 mA charge rate installing appropriate resistors pro vided circuit board done plug mixture transmitters flight packs up four overnight charge Field Fast Charger another Ace product can use youre driving car engine running because constant-current circuit compensates voltage changes automobile caused its charging cir cuit label assigns two charging leads transmitters other two receivers assumption trans mitters require 50 mA charge rate minor modification can ignore designations Just drill two extra holes case can mount Q2 Q3 same way Q 1 Q4 extra heat-sinking obtain will permit draw up 120 mA four outputs Incidently device should perfectly happy charging number cells nine Dont plug anything want charged until have charger plugged source because may light LEDs best bet put switch Off position plug source connect items charged switch unit other way unit may lie Chargeindicating LEDs can light up no charge flowing companion device announced same time Chargemaster 34K55/$3695 Chargemaster will charge two transmitters four flight packs Plastic Dip R very useful makes tough rubbery skin can painted anywhere need resilient seal scuft-proofing better grip strain relief cheap hinge etc George notes can painted foam rubber pad around receiver make waterproof pouch also uses make strain-relief servo connectors below same time makes excellent device Helicopters frequently carry extra flight pack gyro could service two Helicopters time charger feature worth considering Chargemasters provision continuous tricklecharging have read reports say trickle-charging bad Ni-Cds because promotes loss total capacity have also received firsthand reports years tricklecharging obvious ill effect battery-powered handie-talkies soldering irons carving knives etc personal opinion trickle-charging will better RC systems alternative let go flat during long periods inactivity eg Winter let nickle-cadmium batteries sit around discharged condition have tendency develop short circuits growContinued page 132 FiAorh IOQA fl Ace RC Inc Overnighter front charger two nu systems time us designed work cars cigarette-lighter receptacle Chargemaster rear use home features trickle-charging take care long periods inactivity RC systems Electric flight challenge sport flier competitor alike Watts Up introduction should gratifying Happy landings Radio Technique/Myers Continued page 39 ing microscopic whiskers through sulating paper can blow out whis kers high-voltage charge really trust cells afterward dont So away workbench lot Chargemaster may prove fine tool Ace RC Inc Box 51 lE Higginsville MO 64037 George M Myers 70 Froehlich Farm Rd Hicksville NY 11801 [ writing advertisers mention t read about ModI Aviation J-3 has proven over years real crowd pleaserprobably because its good old J-3 fact touches ob servers plane built winter 1978-79 first flown March 3 latter year didnt know till later Bob Boucher Astro Flight design ing Porterfield same time two planes very similar date J-3 has accumulated 334 flights drop oil has soaked 150 depicted Fig 4 Prior 1980 keeping record flight time date number flights thats reason about half plotted Fig 4 obvious five-mm airplane can see vital statistics what details Heres some information about plane J-3 scratch-built using Sig plans guideline Since electricpowered knew plane itself lightweight rugged kit version glow engine would set about redrawing plans choosing construc tion techniques wood sizes consistent application also changed air foil 12/2% flat-bottom section Dihedral added lieu ailerons Result real charmer Admittedly 1-3 fair-weather flier does handle wind well defi nitely fun fly calm air typical flight starts small amount ground handling followed taxi takeoff Fol lowing climb-out back off proportional throttle cruise around Flybys snapbeautiful experience plane pussycat handling several times Ive nearly hypnotized myself flying myself Usually Ill some touch-and-goes two inside loops playing throttle control needed plane glides nicely note some longer lift-assisted flight times Fig 4 generally keep power whole flight varying amount de sired effect About third time have enough power left after landing taxi back pit area Otherwise power out have bring back dead-stick 1-3 good example inadequate battery cooling Im fourth battery heat reason time design construction what looked like good installation cooling has proved adequate Whatever knowledge may have Electrics has come cheaply 15-size motor used plane new version plane new so-called black back 15 current model Astro 15 rather different motor Ferrite 15 uses 12 cells 12 Ah may install someday get longer flights overall weight will increase about 9 oz estimate flight time should increase about 8-9 mm Look over vitals get general idea candidate designs around would perform comparably would require some modeling effort make suitable electric power J-3 example Astro Porterfield 132 Model Aviation Watts Up/MarronElectrics/Kopski Continued page 130 Continued paqe 44 jSSOATES INCNEW MO 13 N IS Dont bee stung AIDS CLOUD WAYHAYWARD CA 945S OS4ONCsalaENYA GUARANTEED CY NO 5310 Os l2O4cy NO 5317 HOT SHOT Hor~US PAT 4405890 Hand held rechargeable glow plug energizer size engine uses gtow plug Small enough carry yoijr shirt pocket Makes dry cell batteries power losing wires thing ot past Easy attachment cowd engines Reinforced extra hard use Can charged upto 1000 times Uses HEAD LOCK glow plug connector MODEL PRODUCTS CORP positive corinec tion tothe glow plug 90 day unconditional guarantee plus limited warranty up year Complete instructions charger Available dealer order direct Visa Mastercard accepted Add Si 50 postage power convenience $1995 Without charger $1595 b & r Hobbies PO Box 192 Oscoda MI 48750 [517] 7393549 Making Leisure Time Enjoyable