Questions

[Jeff Hughes]

Ouch. I was hoping it to be closer than that. I keep reading about these 
large scale electric planes being flown with 28 Nicads or nimh, they must 
not have the performance we need?



----- Original Message ----- 
From: "Jerry Budd" <jbudd at QNET.COM>
To: <discussion at nsrca.org>
Sent: Friday, October 15, 2004 11:07 PM
Subject: Re: Questions


> HI Adam,
>
> The ThunderPower 10s3p LiPo's Frack & I use (Jason too) are actually 
> 42volts, 6ahr = 252 Whr
>
> so that actually works out to ~66 cells and 5 lbs difference in weight to 
> use Nimh.  Not a realistic scenario.
>
> Thx, Jerry
>
>>lipo 10s3p  - 33volts, 5ahr = 165Whr
>>Nimh gp3300 - 1.15volts/cell, 3.3ahr = 3.8Whr/cell works out to 43cells to 
>>store the same energy.
>>^All rough average quick numbers, of course.
>>
>>Thunder Power lipo costs $680 and weighs 1.1kg.
>>Epic GP3300 costs - around $220 and weighs 2.7kg.
>>That is a weight difference of about 3.5lbs.
>>
>>And that is ignoring the problem of parralleling NiMH batteries (as I 
>>understand it, this isn't supposed to be done), and how much extra energy 
>>would be required to carry those 3.5lbs, and the decreased voltage caused 
>>by cold GP3300s.  I think the GP2200's have a higher energy density, so 
>>they might make the numbers a little better, but the point remains.
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>
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> Jerry Budd
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