[NSRCA-discussion] Going Electric - Battery Questions

[Duane Beck]

I get about 4% difference.
9.4 - 6.7 = 2.7
2.7 * 0.1 = 0.27
0.27 / 6.7 = 0.04 (4%)
For 20 fl. oz, that's about 0.7 oz more weight for a 10% increase in nitro (0.27 lb/gal * 20 fl. oz / 128 fl. oz/gal * 16 oz/lb).

Duane

----- Original Message -----
> From: "PhilS." <chuenkan at comcast.net>
> To: "General pattern discussion" <nsrca-discussion at lists.nsrca.org>
> Sent: Friday, December 7, 2012 9:09:28 PM
> Subject: Re: [NSRCA-discussion] Going Electric - Battery Questions
> OK, so if my calculations are correct , a 10% difference in nitro
> amounts to a 0.14% difference in weight. In a 20-oz tank of fuel, I
> can't think that will make a noticeable difference in overall aircraft
> weight or balance. So, doing all thehigher math -- actually, since the
> fuel is going to fly, we must get into computational fluid dynamics!
> ;-{) -- I calculate that 20 oz of 25% fuel weighs 0.96 oz more than a
> 20oz tank of 14% nitro. If my calcs are correct, that is hardly
> anything to write home about!!!
> 
> Phil Spelt, KCRC President
> AMA 1294 Scientific Leader Member
> SPA 177 Board Member
> (865)435-1476v, (865)604-0541c
> On 12/7/2012 8:17 PM, Dave Burton wrote:
> 
> 
> 
> 
> Actually it does! nitro is approx 9.4 lbs per gal, methanol is approx
> 6.7 lbs per gal.