[NSRCA-discussion] Going Electric - Battery Questions

[Duane Beck]

The higher C packs will have lower internal resistance, which means they'll maintain a higher voltage under load.  Higher voltage means the same motor with the same prop will draw more current.  More voltage * more current = a lot more power (W = V * I).

Duane

----- Original Message -----
> From: "Larry Diamond" <ldiamond at diamondrc.com>
> To: "General pattern discussion" <nsrca-discussion at lists.nsrca.org>
> Sent: Friday, December 7, 2012 6:17:47 PM
> Subject: Re: [NSRCA-discussion] Going Electric - Battery Questions
> Interesting point... I don't understand how changing from 20C to 40C
> pack makes a difference using the same Motor and ESC combo. If it's
> battery heat, my electronics background would tell me the pack is
> probably being dicharged too deep. Not good for the life of a battery.
>  
> I suspect the result of not changing the Motor/ESC and only changing
> the battery will reult in a shorter battery life; and, over loading
> the power plant which will probably result in damaging the ESC and/or
> the Motor.
>  
> I could be wrong, cause I really have no experience with electric
> power set ups in planes. I just don't understand the logic going from
> 20C to 40C and the result being "too hot for intermediate".
>  
> It wouldn't surprise me to see Masters or FAI having a higher power
> set up, like 3,500 to 4,000+ watts. Then depending on the max current
> draw,  40C may make sense.
>  
> My set up will be about 2,700 to 3,000 watts based on specs... It may
> not be sufficient for Masters or FAI.
>  
> Perhaps this will turn out to be a good constructive discussion for a
> number of people like me, but I'm curious as to other opinions who
> have practicle knowledge.
>  
> Larry Diamond