Radio Technique George M Myers WE ASSUME interested reader column neither engineer nor technician although Id like hear event catch mistake further assume reader regardless background primarily interested pro longing good times between visits Service Center RC system Therefore following excerpt April 1975 issue Flypaper newsletter Greater Pitts burgh Aero Radio Control Society exactly fits model [Editor item published originally Competition Newsletter] Written Ken Reber Flypaper entitled RC What Land Water Dip Dont Duck story follows recent experience involving plane unauthorized crash farm pond taught few things about RC gear felt would worth sharing plane went water Tuesday recovered until Satur day Id say soaked first impulse crate whole wet mess receiver bat tery servos mail back manufac turer afraid might take longer wanted So attempt save summer flying did following has resulted radio working good new little cost I Dont afraid tackle wet radio things sturdier youd imagine 2 My system equipped three GD 19-4 servos similar KPS-9 use air dielectric capacitor 3 I first removed cases covers set parts front dehumidifier dry got rid moisture servo capaci tor 4 I tore case off battery pack checked internal connections replaced plug repotted sealed battery stuck 12-hour charge 5 When receiver servos com pletely dry brush thinner printed circuit boards remove oxides Wipe carefully soft cloth DC continuity check wires power plug cleaned plugs sprayed tuner cleaner available TV repair shops 6 The switch harness repaired switch sprayed cleaner exer cised plugs DC checks also 7 The servos done last took time As mentioned earlier boards plugs cleaned lubed DC checks made motors taken out gear train subjected about five minutes running 45 volts administered through three-pencell battery pack Switch leads around run backwards also gears servos removed cleaned gear pins removed cleaned much rust replace pins 8 The entire system reassembled tested As new system range check must made faulty components re placed repaired fail Hope never have Batteries Again Late-April 1975 issue Competition Newsletter contained article Fred Hulen Contacts newsletter Kansas City RC Association Fred found cycling particular battery packs im proved capacities values ranging 0% 34% also conducted tests demonstrated self-discharge no load batteries reduced capacities 12% 32% 48 hours after removed charger biggest changes did appear set batteries message clear memory real cycle batteries occasionally discharge level 95 11 volts per cell give full initial charge per manufacturers instructions other message also clear charge bat teries before go flying know should things find excuses eliminate excuse about recharging have using one-shot timer control battery charger years plug radios respective chargers time return field Its part clean up hang up procedure charger left plugged multi-outlet extension line plugged timer Whenever weather forecasts good have free time coming timer started day night fore good times come no need great precision about turn-on time because timer shuts everything down before over charging sets weather turns bad get busy theres no worry about charger might forget shut off Timer could use go appliance store buy Westelock 535A Ingraham Model 12-001 24-hour timer things intended turn appliances off selected times day will repeat action day modified modification consists moving clock -motor wire side switch other shown CLOCK-DRIVEN / SWITCH / / 110 VOLT PLUGCLOCK MOTOR APPLIANCE RECEPTACLE AS RECEIVED / / / MOVE THIS WIRE AS CLOCK SHOWN MOTOR 1 MODIFIED ONE-CYCLE TIMER use device place green trip per 1200 position advance red Off tripper 6 10 16 whatever hours radio manufacturer recommends plug thing together set timer automatic rotate dial until red lights chargers come Now forget about setup return will waiting charged up miss week thats neces sary rotate dial another shot charge have maintenance tales tell pro cedures youd like share contact MODEL AVIATION home 70 Froeh lich Farm Rd Hicksville NY 11801 AMA will pay $5 photos ideas used inked drawings according complexity 12 Model Aviation U Although author involved month watersoaked equipment Don Foster calmly l puffing corncob begins nice soakless flight Sig Commander Brimfield Mass