IIEJGeorgeMMyers jiLJ SIMPLE seasonal maintenance wind blowing snow snowing now time service faithful friend RC system simplest way go about pack everything neatly box ship back manufacturer going no point reading further large group going get around now time Step 1 Charge batteries first month whether use system will prevent expensive nickel-cadmium batteries developing short circuits very easily left discharged too long same time add water leadacid starting batteries because batteries left long period fluid below minimum level will develop insoluble sulfate coatings exposed plates causes permanent loss capacity folks using dry-battery systems take out batteries Step 2 Clean equipment What use cleaning Lets start list ing things never use openers keep dope lacquer thinner away anything made plastic damage caused such solvents ranges etching surface totally dissolv ing parts Another good thing stay miracle spray cleaners advertised being good everything house Most leave some kind film behind some films make slow continuous attack plastic paints films adhesives used manufacturing ironon coverings know theyve done edges start lifting Next list no-nos gasoline family petroleum distil lates hard both people plastics may explode least expect What does leave us little dish detergent water works miracles find dirt glued down castor oil use wood alcohol methanol remove Wood alcohol basic ingredient fuel put gook first place use get oil Warn ing Poison drink avoid breathing fumes buy hardware store say got some epoxy servos wont wash oil RIGHT ccwiifr T cbfAe6fl 44Ck BA1TtRY Iofl l&AJ 5513 id 4 METt Noihing dissolves epoxy wont dis solve plastic case youve really got way get off. anic ally lucky enough oil case will able pick off finger-nail sharp piece plastic Failing careful use X Acto knife blade may allow pry off doesnt work either try filing off very carefully Well Boobala say prob lem isnt epoxy its cyano-acrilate ZAP Hot Stuff etc Doesnt make differ ence youve still got pick off Nail polish remover acetone works some cases eats plastics first started using CA adhesive about 15 years ago called Eastman 910 discovered could get off metal surfaces boiling water may able use thought something careful vacuum cleaner can used blow dust dirt out interior trans mitters servos etc paint brush helpful dislodging stubborn dirt paint brush should have bristles about two inches long wont put enough force anything damage cheap generalpurpose paint brush hardware store kind plastic bristles works well used tooth-brush also has its uses please use very carefully Step 3 Inspect Everything Now everything clean use strong light magnifying glass go looking trouble Things look Wires have broken about break Screws have stripped out backed out have overtightened Warped cracked broken missing parts list Loose plugs test Rubber grommets have become hardened damaged Naturally inspect write down things find wont forget fix Step 4 Test Everything separate men boys thing before pretty natural simple Testing means equipment data anal ysis some fundamental items should have pencil notebook clock VOM Volt-Ohm Meter Two 10 ohm 5 watt resistors Additional items make life simpler include An automatic battery tester An oscilloscope servo tester An oven refrigerator envi ronmental test chamber An RF field-strength meter An expanded-scale voltmeter protractor measure servo travel centering Continued page 86 14 Model Aviation Simplest battery tester clock known resist ance voltmeter Record time required discharge fully-charged end point 11 volts per cell 44V DC usual pack 88 99 liv DC transmitter depending whether 8 9 10 celIsI time drops 75% time recorded new pack time replacement Soap water brushes alcohol minimum equipment 10-ohm 10-watt resistor inexpensive Volt-Ohm meter VOMI simple battery discharge tests need simple maintenance advanced maintenance chores add battery analyzer RS AFM field-strength meter servo tester oscilloscope assortment probes test adapters SPECIAL PRO SERIES 2 FOR RC-FREE FLIGHT CONTROL LINE CIAPITCHPRICE 5%3489 63489 733%4119 53%456129 94566% 77%139 10467149 1066V 8W149 to6016159 114677% 7Y, 7%8159 it6E1W169 11%67169 126179 12555179 1356219 1496249 1566309 164%6389 W 55106 BLADE 855 EXTRA WIDE SERIES 400 B Poe SPEED & RACING ADVANCED DESIGN NO 1 IN PYLON RACING LEADING SPEED REGGRO HOLDER OF ALL TIMES RC PYLON RACING DIA PITCHPRICE 6%3%4129 755%6149 7SN 5/N 6N149 8%6% 6% 7 7%7%189 96%7 7A7%189 CONTROL LINE SPEED& RACING CIA PITCHPRICE 4/8A7129 4%55%129 6788%149 7 7%10%11169 889189 89N9%N189 8% 77%189 912 13219 51ARRflW Homebuilts Bill Youmans firstplace win Masters Class Greenville NRCHA Nationals last August seems increasing interest homebuilt helicopters won scratchbuilt own design composite components Bill came within 10 points aceing hover course local flier Norm Holland has developed scratchbuilt using Kavan mechanics tn-cycle landing gear Rev-o-lution canopy Futaba Sl5M ball-bearing servos EK single-stick radio Kraft engine Tach-Tron gover nor weight 12 1/2 pounds very smooth precise enough people inter ested could soon put kit form Look column further details Dual Counter Rotating Head ScratchBuilt Gilbert Laforest Montreal suc cessfully flew counter rotating-head heli copter own design Greenville NRCHA Nats Webra Speed 60 driving both heads unbelievably complicated pushrod system Self-designed transmitter two single sticks dual rudder knobs much Separate collective control head well separate cyclic control Tremendous under taking say nothing about getting mind synchronized hands Radio custom Can-Air Canadian ProLine some radio interference problems Next months column will cover unique finish helicopters first part building Aerospatiale SA-34 1 G Gazelle ducted fan-tail rotor youre flying youre trying hard enough Walt Schoonard 2080 Sharon Rd Winter Park FL 32789 Letters continued page 7 quality Model viation money best model aviation magazine field William R Barr AMA 31415 Claremont CA MA policy publish types models eventually shall get around Mr Barrs suggestions Mistaken Identity No doubt have received few letters already rare event havent would like point out photograph lower right hand corner page 25 Aug 1977 issue Model viation incorrectly captioned gentleman photo Rick Pear son winner last years Soar Nats well other contests sailplane holding Paragon Rick did outstanding job flying under less ideal conditions would shame did receive credit display flying skill Since generally true least 75% sailplanes performance direct function pilots skill would follow mention sailplane used would significant have no doubt uninten tional error know would want errors called attention proper caption can used Ed Slobod Pierce Aero Company Nonthridge CA Size It/Powers continued page 13 ing slower speed reduce somewhat power requirements because scaling down proto type its weight-empty condition rather its gross-weight condition thats ut Size Questions comments may ad dressed Bradford W Powers care magazine Seastrutz/Wi son continued page 18 full throttle some down-elevator Ed pulled up Seastrutz oil like scared duck full stall attitude 50 feet hit wind blowing toward hill blown end-over-end trees Damage minor Test flying continued next week Fall Brimfield meet time stabilizer shim under its leading edge rudder area doubled Seastrutz flew beautifully Among its test pilots Ted Straders son Eric testified flew very much like its predecessor Strutz Echo Seastrutz built mci dences shown will perform very well relatively docile its 46-in wing span compact biplane configuration felt might too quick average flier case diffi cult machine fly land water Have fun Radio Technique/Myers continued page 14 An ammeter measure charging discharging operating currents turntable drum-type chart feed measure servo transmit time shaker find intermittent prob lems heat lamp can Freezit similar chiller locate temperature-sensitive compon ents Special tools various types like desoldering irons Youve seen lot items listed under additional advertisements probability should leave will describe some simple non destructive tests should perform 86 Model Aviation NEWS FLASH Bob Smith Chatsworth CA set new World Speed Record June 19 Pylon mula 11125 RevUp 8%-6% new Pylon RaC ing prop OUT- PERFORMS ALL OTHERS AT THE 1976 NATIONALS 1st RC Masters Class 1st RC Advanced 1st RC Novice 1st RC Sport Scale 1st Formula Pylon 1st Quarter Midget Pylon 1st CL Stunt Open 1st CL Stunt Senior 1st CL Stunt Junior 1st CL Combat O & Sr 1st CL Slow Comb OP & Sr 1st CL Class 0 Speed Open 1st CL Class C Speed Jr & Sr 1st CLCIassB Speed Op & Sr 1st CL Cl Speed Op Sr Jr 1st FE Class B Open 1st FE Class C Open HIGH PERFORMANCE * COMPETITION PROVEN * THIN RIGID BLADES OP HARD MAPLE WOOD * SUPERBLY FINISHED COMPLETELY FUEL PIDOF 1st CL Carrier II Op Jr Sr 1st CL Carrier Jr & Sr 1st CL Formula 40 Opec 1st CL Class 6 Proto Jr fundamental items Transmitter Tests First obvi ous Try switch knob pushbutton control stick trim lever find out doing what should take system outside perform range check described manual came system general dislike range checks cover less about 50 feet ground range because its too hard detect changes shorter ranges have systems calls 9- 10-foot ground range test antenna transmitter collapsed much possible antenna disap pears inside transmitter case test first section pulled way out Measure ground range terms paces length stride walking normally See last months column additional details Next charge transmitter pack fully extend antenna full length note time turn transmitter night wont shooting someone down its raining snowing Note output meter reading Now go something else Check output meter hour Note time falls half-scale calculate elapsed time new system operates 4 hours can expect moderately-used system drop about 3 hours after 5 years happens buy yourself new transmitter battery pack time shortens much less 5 years probably have least shorted cell pack should replaced Recharge transmitter set aside Receiver Servo Tests testing transmitter should have noticed servos jumping sticking running noticeably slower others find mark piece tape description prob lem stick servo Try swapping servos around prove trouble servo transmitter receiver have servo tester can help pinpoint troubles Repairs matter deciding whos going ityou factory local service center event convinced receiver needs retuning might check circuit discover two coils output end cir cuit ones likely need adjustment antenna coils rarely shift enough warrant readjustment Make tuning wand like described page 12 September 1977 column tune best ground range very important point about retun ing no value attempting retune receiver being disturbed noisy servo have jittery servo probable cause loose dirty wiper potentiometer feedback potentiometer electrical noise results such condition can easily cut ground range half Without getting technical about reason range reduction AGC Automatic Gain Con trol action within receiver response servo noise Therefore use good servos tuning Receiver Battery Tests subject has done death recent years Buy borrow battery analyzer test battery pack performance 25% below normal find out fix replace pack new battery pack cheapest insurance can buy continued happy flying Summary discussion has delib erately kept very simple just convince you can will perform simple maintenance chores described above guarantee will fly longer better next year have fun doing dont have electron ics technician take proper care equipment George Myers 70 Froehlich Farm Rd Hicksville NY 11801 RC Aerobatics/VanPutte continued page 21 South run Steve Helms well known pattern flier out standing work did Pro Line January1978 87 5MUF-L-ITSERIESNEW PRODUCTS ISTON SETTING TOOL ST FOR EVERY CLUB / MUFFLER/SIh CAR MUFFLER K& B 35ccuiienuwiC CLEANER21 QT 16500 Mufflers s zeENGINE MOUNTS Schnue le09 15 379NOTE cog r1e1SK4B 459SEE YOUR 1925395DEALER FOR 2940489PRICE OF 6080859MOUNT FOR YOUR ENGINE 1150to1795FACTORYFOR NOSE GEARSOR SEND TO CALIJMET SERIES MUFFLERS BATTERY CHARGER See yir dealer no dealer 10100 convenient order direct SCALE INSTRUMENT KITSSer 25C ccxtJete catalno 56 3/B TIMERS 7 6 1 2 FUELCUTOFFlISOENGINETEST ALLSIZES 279DETHERMALIZER 1150STAND 865Tatan Products Corp SOC OSNUVA Ave THE WORLD S LARGEST LINE OF MUFFLERS AND ENGINE MOUNTS AN FSANCCO CA
Edition: Model Aviation - 1978/01
Page Numbers: 14, 86, 87
IIEJGeorgeMMyers jiLJ SIMPLE seasonal maintenance wind blowing snow snowing now time service faithful friend RC system simplest way go about pack everything neatly box ship back manufacturer going no point reading further large group going get around now time Step 1 Charge batteries first month whether use system will prevent expensive nickel-cadmium batteries developing short circuits very easily left discharged too long same time add water leadacid starting batteries because batteries left long period fluid below minimum level will develop insoluble sulfate coatings exposed plates causes permanent loss capacity folks using dry-battery systems take out batteries Step 2 Clean equipment What use cleaning Lets start list ing things never use openers keep dope lacquer thinner away anything made plastic damage caused such solvents ranges etching surface totally dissolv ing parts Another good thing stay miracle spray cleaners advertised being good everything house Most leave some kind film behind some films make slow continuous attack plastic paints films adhesives used manufacturing ironon coverings know theyve done edges start lifting Next list no-nos gasoline family petroleum distil lates hard both people plastics may explode least expect What does leave us little dish detergent water works miracles find dirt glued down castor oil use wood alcohol methanol remove Wood alcohol basic ingredient fuel put gook first place use get oil Warn ing Poison drink avoid breathing fumes buy hardware store say got some epoxy servos wont wash oil RIGHT ccwiifr T cbfAe6fl 44Ck BA1TtRY Iofl l&AJ 5513 id 4 METt Noihing dissolves epoxy wont dis solve plastic case youve really got way get off. anic ally lucky enough oil case will able pick off finger-nail sharp piece plastic Failing careful use X Acto knife blade may allow pry off doesnt work either try filing off very carefully Well Boobala say prob lem isnt epoxy its cyano-acrilate ZAP Hot Stuff etc Doesnt make differ ence youve still got pick off Nail polish remover acetone works some cases eats plastics first started using CA adhesive about 15 years ago called Eastman 910 discovered could get off metal surfaces boiling water may able use thought something careful vacuum cleaner can used blow dust dirt out interior trans mitters servos etc paint brush helpful dislodging stubborn dirt paint brush should have bristles about two inches long wont put enough force anything damage cheap generalpurpose paint brush hardware store kind plastic bristles works well used tooth-brush also has its uses please use very carefully Step 3 Inspect Everything Now everything clean use strong light magnifying glass go looking trouble Things look Wires have broken about break Screws have stripped out backed out have overtightened Warped cracked broken missing parts list Loose plugs test Rubber grommets have become hardened damaged Naturally inspect write down things find wont forget fix Step 4 Test Everything separate men boys thing before pretty natural simple Testing means equipment data anal ysis some fundamental items should have pencil notebook clock VOM Volt-Ohm Meter Two 10 ohm 5 watt resistors Additional items make life simpler include An automatic battery tester An oscilloscope servo tester An oven refrigerator envi ronmental test chamber An RF field-strength meter An expanded-scale voltmeter protractor measure servo travel centering Continued page 86 14 Model Aviation Simplest battery tester clock known resist ance voltmeter Record time required discharge fully-charged end point 11 volts per cell 44V DC usual pack 88 99 liv DC transmitter depending whether 8 9 10 celIsI time drops 75% time recorded new pack time replacement Soap water brushes alcohol minimum equipment 10-ohm 10-watt resistor inexpensive Volt-Ohm meter VOMI simple battery discharge tests need simple maintenance advanced maintenance chores add battery analyzer RS AFM field-strength meter servo tester oscilloscope assortment probes test adapters SPECIAL PRO SERIES 2 FOR RC-FREE FLIGHT CONTROL LINE CIAPITCHPRICE 5%3489 63489 733%4119 53%456129 94566% 77%139 10467149 1066V 8W149 to6016159 114677% 7Y, 7%8159 it6E1W169 11%67169 126179 12555179 1356219 1496249 1566309 164%6389 W 55106 BLADE 855 EXTRA WIDE SERIES 400 B Poe SPEED & RACING ADVANCED DESIGN NO 1 IN PYLON RACING LEADING SPEED REGGRO HOLDER OF ALL TIMES RC PYLON RACING DIA PITCHPRICE 6%3%4129 755%6149 7SN 5/N 6N149 8%6% 6% 7 7%7%189 96%7 7A7%189 CONTROL LINE SPEED& RACING CIA PITCHPRICE 4/8A7129 4%55%129 6788%149 7 7%10%11169 889189 89N9%N189 8% 77%189 912 13219 51ARRflW Homebuilts Bill Youmans firstplace win Masters Class Greenville NRCHA Nationals last August seems increasing interest homebuilt helicopters won scratchbuilt own design composite components Bill came within 10 points aceing hover course local flier Norm Holland has developed scratchbuilt using Kavan mechanics tn-cycle landing gear Rev-o-lution canopy Futaba Sl5M ball-bearing servos EK single-stick radio Kraft engine Tach-Tron gover nor weight 12 1/2 pounds very smooth precise enough people inter ested could soon put kit form Look column further details Dual Counter Rotating Head ScratchBuilt Gilbert Laforest Montreal suc cessfully flew counter rotating-head heli copter own design Greenville NRCHA Nats Webra Speed 60 driving both heads unbelievably complicated pushrod system Self-designed transmitter two single sticks dual rudder knobs much Separate collective control head well separate cyclic control Tremendous under taking say nothing about getting mind synchronized hands Radio custom Can-Air Canadian ProLine some radio interference problems Next months column will cover unique finish helicopters first part building Aerospatiale SA-34 1 G Gazelle ducted fan-tail rotor youre flying youre trying hard enough Walt Schoonard 2080 Sharon Rd Winter Park FL 32789 Letters continued page 7 quality Model viation money best model aviation magazine field William R Barr AMA 31415 Claremont CA MA policy publish types models eventually shall get around Mr Barrs suggestions Mistaken Identity No doubt have received few letters already rare event havent would like point out photograph lower right hand corner page 25 Aug 1977 issue Model viation incorrectly captioned gentleman photo Rick Pear son winner last years Soar Nats well other contests sailplane holding Paragon Rick did outstanding job flying under less ideal conditions would shame did receive credit display flying skill Since generally true least 75% sailplanes performance direct function pilots skill would follow mention sailplane used would significant have no doubt uninten tional error know would want errors called attention proper caption can used Ed Slobod Pierce Aero Company Nonthridge CA Size It/Powers continued page 13 ing slower speed reduce somewhat power requirements because scaling down proto type its weight-empty condition rather its gross-weight condition thats ut Size Questions comments may ad dressed Bradford W Powers care magazine Seastrutz/Wi son continued page 18 full throttle some down-elevator Ed pulled up Seastrutz oil like scared duck full stall attitude 50 feet hit wind blowing toward hill blown end-over-end trees Damage minor Test flying continued next week Fall Brimfield meet time stabilizer shim under its leading edge rudder area doubled Seastrutz flew beautifully Among its test pilots Ted Straders son Eric testified flew very much like its predecessor Strutz Echo Seastrutz built mci dences shown will perform very well relatively docile its 46-in wing span compact biplane configuration felt might too quick average flier case diffi cult machine fly land water Have fun Radio Technique/Myers continued page 14 An ammeter measure charging discharging operating currents turntable drum-type chart feed measure servo transmit time shaker find intermittent prob lems heat lamp can Freezit similar chiller locate temperature-sensitive compon ents Special tools various types like desoldering irons Youve seen lot items listed under additional advertisements probability should leave will describe some simple non destructive tests should perform 86 Model Aviation NEWS FLASH Bob Smith Chatsworth CA set new World Speed Record June 19 Pylon mula 11125 RevUp 8%-6% new Pylon RaC ing prop OUT- PERFORMS ALL OTHERS AT THE 1976 NATIONALS 1st RC Masters Class 1st RC Advanced 1st RC Novice 1st RC Sport Scale 1st Formula Pylon 1st Quarter Midget Pylon 1st CL Stunt Open 1st CL Stunt Senior 1st CL Stunt Junior 1st CL Combat O & Sr 1st CL Slow Comb OP & Sr 1st CL Class 0 Speed Open 1st CL Class C Speed Jr & Sr 1st CLCIassB Speed Op & Sr 1st CL Cl Speed Op Sr Jr 1st FE Class B Open 1st FE Class C Open HIGH PERFORMANCE * COMPETITION PROVEN * THIN RIGID BLADES OP HARD MAPLE WOOD * SUPERBLY FINISHED COMPLETELY FUEL PIDOF 1st CL Carrier II Op Jr Sr 1st CL Carrier Jr & Sr 1st CL Formula 40 Opec 1st CL Class 6 Proto Jr fundamental items Transmitter Tests First obvi ous Try switch knob pushbutton control stick trim lever find out doing what should take system outside perform range check described manual came system general dislike range checks cover less about 50 feet ground range because its too hard detect changes shorter ranges have systems calls 9- 10-foot ground range test antenna transmitter collapsed much possible antenna disap pears inside transmitter case test first section pulled way out Measure ground range terms paces length stride walking normally See last months column additional details Next charge transmitter pack fully extend antenna full length note time turn transmitter night wont shooting someone down its raining snowing Note output meter reading Now go something else Check output meter hour Note time falls half-scale calculate elapsed time new system operates 4 hours can expect moderately-used system drop about 3 hours after 5 years happens buy yourself new transmitter battery pack time shortens much less 5 years probably have least shorted cell pack should replaced Recharge transmitter set aside Receiver Servo Tests testing transmitter should have noticed servos jumping sticking running noticeably slower others find mark piece tape description prob lem stick servo Try swapping servos around prove trouble servo transmitter receiver have servo tester can help pinpoint troubles Repairs matter deciding whos going ityou factory local service center event convinced receiver needs retuning might check circuit discover two coils output end cir cuit ones likely need adjustment antenna coils rarely shift enough warrant readjustment Make tuning wand like described page 12 September 1977 column tune best ground range very important point about retun ing no value attempting retune receiver being disturbed noisy servo have jittery servo probable cause loose dirty wiper potentiometer feedback potentiometer electrical noise results such condition can easily cut ground range half Without getting technical about reason range reduction AGC Automatic Gain Con trol action within receiver response servo noise Therefore use good servos tuning Receiver Battery Tests subject has done death recent years Buy borrow battery analyzer test battery pack performance 25% below normal find out fix replace pack new battery pack cheapest insurance can buy continued happy flying Summary discussion has delib erately kept very simple just convince you can will perform simple maintenance chores described above guarantee will fly longer better next year have fun doing dont have electron ics technician take proper care equipment George Myers 70 Froehlich Farm Rd Hicksville NY 11801 RC Aerobatics/VanPutte continued page 21 South run Steve Helms well known pattern flier out standing work did Pro Line January1978 87 5MUF-L-ITSERIESNEW PRODUCTS ISTON SETTING TOOL ST FOR EVERY CLUB / MUFFLER/SIh CAR MUFFLER K& B 35ccuiienuwiC CLEANER21 QT 16500 Mufflers s zeENGINE MOUNTS Schnue le09 15 379NOTE cog r1e1SK4B 459SEE YOUR 1925395DEALER FOR 2940489PRICE OF 6080859MOUNT FOR YOUR ENGINE 1150to1795FACTORYFOR NOSE GEARSOR SEND TO CALIJMET SERIES MUFFLERS BATTERY CHARGER See yir dealer no dealer 10100 convenient order direct SCALE INSTRUMENT KITSSer 25C ccxtJete catalno 56 3/B TIMERS 7 6 1 2 FUELCUTOFFlISOENGINETEST ALLSIZES 279DETHERMALIZER 1150STAND 865Tatan Products Corp SOC OSNUVA Ave THE WORLD S LARGEST LINE OF MUFFLERS AND ENGINE MOUNTS AN FSANCCO CA
Edition: Model Aviation - 1978/01
Page Numbers: 14, 86, 87
IIEJGeorgeMMyers jiLJ SIMPLE seasonal maintenance wind blowing snow snowing now time service faithful friend RC system simplest way go about pack everything neatly box ship back manufacturer going no point reading further large group going get around now time Step 1 Charge batteries first month whether use system will prevent expensive nickel-cadmium batteries developing short circuits very easily left discharged too long same time add water leadacid starting batteries because batteries left long period fluid below minimum level will develop insoluble sulfate coatings exposed plates causes permanent loss capacity folks using dry-battery systems take out batteries Step 2 Clean equipment What use cleaning Lets start list ing things never use openers keep dope lacquer thinner away anything made plastic damage caused such solvents ranges etching surface totally dissolv ing parts Another good thing stay miracle spray cleaners advertised being good everything house Most leave some kind film behind some films make slow continuous attack plastic paints films adhesives used manufacturing ironon coverings know theyve done edges start lifting Next list no-nos gasoline family petroleum distil lates hard both people plastics may explode least expect What does leave us little dish detergent water works miracles find dirt glued down castor oil use wood alcohol methanol remove Wood alcohol basic ingredient fuel put gook first place use get oil Warn ing Poison drink avoid breathing fumes buy hardware store say got some epoxy servos wont wash oil RIGHT ccwiifr T cbfAe6fl 44Ck BA1TtRY Iofl l&AJ 5513 id 4 METt Noihing dissolves epoxy wont dis solve plastic case youve really got way get off. anic ally lucky enough oil case will able pick off finger-nail sharp piece plastic Failing careful use X Acto knife blade may allow pry off doesnt work either try filing off very carefully Well Boobala say prob lem isnt epoxy its cyano-acrilate ZAP Hot Stuff etc Doesnt make differ ence youve still got pick off Nail polish remover acetone works some cases eats plastics first started using CA adhesive about 15 years ago called Eastman 910 discovered could get off metal surfaces boiling water may able use thought something careful vacuum cleaner can used blow dust dirt out interior trans mitters servos etc paint brush helpful dislodging stubborn dirt paint brush should have bristles about two inches long wont put enough force anything damage cheap generalpurpose paint brush hardware store kind plastic bristles works well used tooth-brush also has its uses please use very carefully Step 3 Inspect Everything Now everything clean use strong light magnifying glass go looking trouble Things look Wires have broken about break Screws have stripped out backed out have overtightened Warped cracked broken missing parts list Loose plugs test Rubber grommets have become hardened damaged Naturally inspect write down things find wont forget fix Step 4 Test Everything separate men boys thing before pretty natural simple Testing means equipment data anal ysis some fundamental items should have pencil notebook clock VOM Volt-Ohm Meter Two 10 ohm 5 watt resistors Additional items make life simpler include An automatic battery tester An oscilloscope servo tester An oven refrigerator envi ronmental test chamber An RF field-strength meter An expanded-scale voltmeter protractor measure servo travel centering Continued page 86 14 Model Aviation Simplest battery tester clock known resist ance voltmeter Record time required discharge fully-charged end point 11 volts per cell 44V DC usual pack 88 99 liv DC transmitter depending whether 8 9 10 celIsI time drops 75% time recorded new pack time replacement Soap water brushes alcohol minimum equipment 10-ohm 10-watt resistor inexpensive Volt-Ohm meter VOMI simple battery discharge tests need simple maintenance advanced maintenance chores add battery analyzer RS AFM field-strength meter servo tester oscilloscope assortment probes test adapters SPECIAL PRO SERIES 2 FOR RC-FREE FLIGHT CONTROL LINE CIAPITCHPRICE 5%3489 63489 733%4119 53%456129 94566% 77%139 10467149 1066V 8W149 to6016159 114677% 7Y, 7%8159 it6E1W169 11%67169 126179 12555179 1356219 1496249 1566309 164%6389 W 55106 BLADE 855 EXTRA WIDE SERIES 400 B Poe SPEED & RACING ADVANCED DESIGN NO 1 IN PYLON RACING LEADING SPEED REGGRO HOLDER OF ALL TIMES RC PYLON RACING DIA PITCHPRICE 6%3%4129 755%6149 7SN 5/N 6N149 8%6% 6% 7 7%7%189 96%7 7A7%189 CONTROL LINE SPEED& RACING CIA PITCHPRICE 4/8A7129 4%55%129 6788%149 7 7%10%11169 889189 89N9%N189 8% 77%189 912 13219 51ARRflW Homebuilts Bill Youmans firstplace win Masters Class Greenville NRCHA Nationals last August seems increasing interest homebuilt helicopters won scratchbuilt own design composite components Bill came within 10 points aceing hover course local flier Norm Holland has developed scratchbuilt using Kavan mechanics tn-cycle landing gear Rev-o-lution canopy Futaba Sl5M ball-bearing servos EK single-stick radio Kraft engine Tach-Tron gover nor weight 12 1/2 pounds very smooth precise enough people inter ested could soon put kit form Look column further details Dual Counter Rotating Head ScratchBuilt Gilbert Laforest Montreal suc cessfully flew counter rotating-head heli copter own design Greenville NRCHA Nats Webra Speed 60 driving both heads unbelievably complicated pushrod system Self-designed transmitter two single sticks dual rudder knobs much Separate collective control head well separate cyclic control Tremendous under taking say nothing about getting mind synchronized hands Radio custom Can-Air Canadian ProLine some radio interference problems Next months column will cover unique finish helicopters first part building Aerospatiale SA-34 1 G Gazelle ducted fan-tail rotor youre flying youre trying hard enough Walt Schoonard 2080 Sharon Rd Winter Park FL 32789 Letters continued page 7 quality Model viation money best model aviation magazine field William R Barr AMA 31415 Claremont CA MA policy publish types models eventually shall get around Mr Barrs suggestions Mistaken Identity No doubt have received few letters already rare event havent would like point out photograph lower right hand corner page 25 Aug 1977 issue Model viation incorrectly captioned gentleman photo Rick Pear son winner last years Soar Nats well other contests sailplane holding Paragon Rick did outstanding job flying under less ideal conditions would shame did receive credit display flying skill Since generally true least 75% sailplanes performance direct function pilots skill would follow mention sailplane used would significant have no doubt uninten tional error know would want errors called attention proper caption can used Ed Slobod Pierce Aero Company Nonthridge CA Size It/Powers continued page 13 ing slower speed reduce somewhat power requirements because scaling down proto type its weight-empty condition rather its gross-weight condition thats ut Size Questions comments may ad dressed Bradford W Powers care magazine Seastrutz/Wi son continued page 18 full throttle some down-elevator Ed pulled up Seastrutz oil like scared duck full stall attitude 50 feet hit wind blowing toward hill blown end-over-end trees Damage minor Test flying continued next week Fall Brimfield meet time stabilizer shim under its leading edge rudder area doubled Seastrutz flew beautifully Among its test pilots Ted Straders son Eric testified flew very much like its predecessor Strutz Echo Seastrutz built mci dences shown will perform very well relatively docile its 46-in wing span compact biplane configuration felt might too quick average flier case diffi cult machine fly land water Have fun Radio Technique/Myers continued page 14 An ammeter measure charging discharging operating currents turntable drum-type chart feed measure servo transmit time shaker find intermittent prob lems heat lamp can Freezit similar chiller locate temperature-sensitive compon ents Special tools various types like desoldering irons Youve seen lot items listed under additional advertisements probability should leave will describe some simple non destructive tests should perform 86 Model Aviation NEWS FLASH Bob Smith Chatsworth CA set new World Speed Record June 19 Pylon mula 11125 RevUp 8%-6% new Pylon RaC ing prop OUT- PERFORMS ALL OTHERS AT THE 1976 NATIONALS 1st RC Masters Class 1st RC Advanced 1st RC Novice 1st RC Sport Scale 1st Formula Pylon 1st Quarter Midget Pylon 1st CL Stunt Open 1st CL Stunt Senior 1st CL Stunt Junior 1st CL Combat O & Sr 1st CL Slow Comb OP & Sr 1st CL Class 0 Speed Open 1st CL Class C Speed Jr & Sr 1st CLCIassB Speed Op & Sr 1st CL Cl Speed Op Sr Jr 1st FE Class B Open 1st FE Class C Open HIGH PERFORMANCE * COMPETITION PROVEN * THIN RIGID BLADES OP HARD MAPLE WOOD * SUPERBLY FINISHED COMPLETELY FUEL PIDOF 1st CL Carrier II Op Jr Sr 1st CL Carrier Jr & Sr 1st CL Formula 40 Opec 1st CL Class 6 Proto Jr fundamental items Transmitter Tests First obvi ous Try switch knob pushbutton control stick trim lever find out doing what should take system outside perform range check described manual came system general dislike range checks cover less about 50 feet ground range because its too hard detect changes shorter ranges have systems calls 9- 10-foot ground range test antenna transmitter collapsed much possible antenna disap pears inside transmitter case test first section pulled way out Measure ground range terms paces length stride walking normally See last months column additional details Next charge transmitter pack fully extend antenna full length note time turn transmitter night wont shooting someone down its raining snowing Note output meter reading Now go something else Check output meter hour Note time falls half-scale calculate elapsed time new system operates 4 hours can expect moderately-used system drop about 3 hours after 5 years happens buy yourself new transmitter battery pack time shortens much less 5 years probably have least shorted cell pack should replaced Recharge transmitter set aside Receiver Servo Tests testing transmitter should have noticed servos jumping sticking running noticeably slower others find mark piece tape description prob lem stick servo Try swapping servos around prove trouble servo transmitter receiver have servo tester can help pinpoint troubles Repairs matter deciding whos going ityou factory local service center event convinced receiver needs retuning might check circuit discover two coils output end cir cuit ones likely need adjustment antenna coils rarely shift enough warrant readjustment Make tuning wand like described page 12 September 1977 column tune best ground range very important point about retun ing no value attempting retune receiver being disturbed noisy servo have jittery servo probable cause loose dirty wiper potentiometer feedback potentiometer electrical noise results such condition can easily cut ground range half Without getting technical about reason range reduction AGC Automatic Gain Con trol action within receiver response servo noise Therefore use good servos tuning Receiver Battery Tests subject has done death recent years Buy borrow battery analyzer test battery pack performance 25% below normal find out fix replace pack new battery pack cheapest insurance can buy continued happy flying Summary discussion has delib erately kept very simple just convince you can will perform simple maintenance chores described above guarantee will fly longer better next year have fun doing dont have electron ics technician take proper care equipment George Myers 70 Froehlich Farm Rd Hicksville NY 11801 RC Aerobatics/VanPutte continued page 21 South run Steve Helms well known pattern flier out standing work did Pro Line January1978 87 5MUF-L-ITSERIESNEW PRODUCTS ISTON SETTING TOOL ST FOR EVERY CLUB / MUFFLER/SIh CAR MUFFLER K& B 35ccuiienuwiC CLEANER21 QT 16500 Mufflers s zeENGINE MOUNTS Schnue le09 15 379NOTE cog r1e1SK4B 459SEE YOUR 1925395DEALER FOR 2940489PRICE OF 6080859MOUNT FOR YOUR ENGINE 1150to1795FACTORYFOR NOSE GEARSOR SEND TO CALIJMET SERIES MUFFLERS BATTERY CHARGER See yir dealer no dealer 10100 convenient order direct SCALE INSTRUMENT KITSSer 25C ccxtJete catalno 56 3/B TIMERS 7 6 1 2 FUELCUTOFFlISOENGINETEST ALLSIZES 279DETHERMALIZER 1150STAND 865Tatan Products Corp SOC OSNUVA Ave THE WORLD S LARGEST LINE OF MUFFLERS AND ENGINE MOUNTS AN FSANCCO CA