NIMH vs. NICAD for ignition
12-04-2002, 04:10 PM
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NIMH vs. NICAD for ignition
why would there be a difference on the battery just because it is a gasser - the nimh holds a longer charge but it's life expectancy is shorter - as i understand. but i would be very interested in any good/useful info on the subject too..
12-04-2002, 04:16 PM
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NIMH vs. NICAD for ignition
I am using 1650 NIMH on my bme 50. I only have 18 flights on it but it has worked perfectly. I could fly all day on that pack.
12-04-2002, 04:40 PM
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I went from a 1400 NiCd pack to a 1650NiMh on my 106" Edge with a 3W 100 with no problems. Don't remember the weight difference since I'm at work 
, but the pack was smaller besides weighing less. If you do a search on this, you'll find a couple of threads with good info. Happy Holidays_bob
, but the pack was smaller besides weighing less. If you do a search on this, you'll find a couple of threads with good info. Happy Holidays_bob
12-04-2002, 09:04 PM
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NIMH vs. NICAD for ignition
Obviously, NiCd and NiMH are engineered differently. NiCd batteries are a better source for higher current draws than what NiMH is. Simply put, NiCd can discharge higher current faster than NiMH, therefor people think that they may be able to get a better spark from the NiCd. The current draw from the ignition module is regulated BY the ignition module and generally in not that significant.....SO, NiCd is not really needed in this case, INFACT NiMH performs very well with todays ignition modules. 
Jeff
Jeff
12-05-2002, 12:01 AM
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NIMH vs. NICAD for ignition
RCShowcase recommends Nicads rather than NiMH packs for the Falkon ignitions on ZDZ motors. I believe the ignition can draw around 800 mA at high rpm (more current for the twin than single). NiMH doesn't delivery as high a voltage when the current draw is high. If the voltage is too low, the ignition won't work.
Despite that, I have used NiMH (2700mAH) packs on the ZDZ and 3W. I think where you could get into a problem is with a low capacity NiMH pack, which will show a much larger voltage drop under a high current draw.
Despite that, I have used NiMH (2700mAH) packs on the ZDZ and 3W. I think where you could get into a problem is with a low capacity NiMH pack, which will show a much larger voltage drop under a high current draw.
12-05-2002, 01:24 AM
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NIMH vs. NICAD for ignition
800 mA of current can give quite a voltage depression to a NiMH pack. Try this experiment. Take a 1200 mAH NiMH pack and Nicad pack. Charge them full. Put a 500 mA load (800mA even better) on with your ESV. Measure the volts. Which one is higher?
