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Model Forum / Radio Controlled / Land Models / August 2007Tamiya Big Wig Mid 80s (Diagnosing Electrical Fault) Whats the voltage for an old reciever?
Hi All, Does anyone know what voltage I should be measuring running into the reciever? I'm getting 7.2V off the battery. That runs into the old mechanical speed controller just fine. I've then checked the feed from the on/off switch which also looks to have some resistors and a few other bits and bobs. It's output to the reciever is running at 0.6 volts. I managed to get it running temporarily yesterday after reconnecting everything. Now it's back to dead. :( Any help or links would be appreciated. The reciever is a KO-Digiace KR-283 if that makes any difference. Cheers, Fin > Hi All, > [quoted text clipped - 12 lines] > > Fin Think I've narrowed it down. The voltage regulator might be stuffed. I have put that to the side for another time and I swapped out the electronics for a modern speed controller and reciever and everything is running fine. Nips around well fast for two minutes then dies about five minute later. Good fun. Interesting though. My friend was running a modern tamiya mini cooper and the little thing managed to last 15 minutes on a 7.2V 20 year old pack. My car went through two modern 7.2 packs and an aged 8.4 volt one. I understand the 4wd drive train will be sapping some extra effort. However I can't see why the battery lifespan would be so different. It doesn't seem to be friction as the car runs and accellerates just as good as day one. It just seems to be sapping out the batteries at a crazy rate. Are older motors noticabley less efficient? As this is the only electrical component that is still of 1980s vintage. Fin : > Hi All, : > [quoted text clipped - 31 lines] : : Fin a mini cooper runs on a silver 540 can. That is roughly 36 turn. older motors may have a great deal of tarnish on the brushes and copper com. more resistance and sparking to get the motor running. > a mini cooper runs on a silver 540 can. That is roughly 36 turn. older > motors may have a great deal of tarnish on the brushes and copper com. more > resistance and sparking to get the motor running. The Bigwig's stock motor was a Technigold. Tame by modern standards but it REALLY sucks back the battery life.  SignaturePosted via a free Usenet account from http://www.teranews.com On Aug 7, 3:16 pm, "SBlackfoot" <trypti...@sympatico.obvious.ca> wrote: > > a mini cooper runs on a silver 540 can. That is roughly 36 turn. older > > motors may have a great deal of tarnish on the brushes and copper com. [quoted text clipped - 6 lines] > -- > Posted via a free Usenet account fromhttp://www.teranews.com Hi Ian/SBlackfoot MMMMmmmmm sounds like an excuse to get a new motor. Are there any good sites for comparisons between power consumption and performance? I'm not looking for anything crazy fast. I used to run a 50k+ rpm high torque motor in the bigwig during the nineties and it ate batteries in under 2 minutes. Went like a rocket from hell for those two minutes but I'm a calmer person now and I'd like to run for more than 15 mins at moderate speeds. I've got my nitro car if I want the hassle of smashed parts with every crash. I also note it may be harder to source replacements now than back in the old days. No re- released bigwig like they've done with some of the other cars like the grasshopper. Do the brushless motors improve battery performance? From what I read on the forums it just seems to be a saver on maintenance. I've ordered up some 2200 and 3600 mah batteries and a new delta peak battery charger so I'm hoping to have a better experience than with my 1200mah 22 year old batteries. I'm amazed they even held a charge. Although that said I did manage to explode one over the weekend after overcharging it by 15 minutes. Went off like a gunshot. I can see why they don't do fast chargers without timers anymore. Cheers for the info guys, Fin |
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