Questions

[mike mueller]

 Jeff E Pattern is still a tough proposition. It'll be cool when the technology and the costs make it mainstream. Until then I'm buying a new YS DZ 160 and keeping my fingers crossed that it doesn't blow up! Mike

Jeff Hughes <jeffghughes at comcast.net> wrote: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" 
To: 
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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>
>
> -- 
> ___________
> Jerry Budd
> mailto:jbudd at qnet.com
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> 

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