[NSRCA-discussion] NiMH Question

[Jerry Budd]

>I find the same procedure also works well for NiCad's. If you reset 
>the peak charger and restart it you will cook the  batteries and 
>suffer short battery life. NiCad's normally fail shorted and you 
>have enough power to land. NiMh's normally fail open and you will 
>need another airplane to go with your new battery.
>
>That is also why I use NiMh in the transmitter and NiCads in the flight packs.


John,

Why, if you are concerned about a cell failing "open", is it OK to 
use NiMH cells in your transmitter but not in your flight packs? 
They're both single string systems, an open cell failure in either is 
going to result in a catastrophic failure and loss of aircraft.

Are you thinking that the flight environment (flight loads, 
vibration, etc) is the primary contributor to the likelihood of a 
cell failing open?

Thx, Jerry

-- 
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Jerry Budd
Budd Engineering
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