[NSRCA-discussion] Going Electric - Battery Questions

[Patrick Harris]

I agree. 4,400 20C Sky Lipos are perfect for your plane at under 20 oz and
less than 50 bucks. What more can you ask for. I flew them all this year,
but have moved to 40C 4,400's for Masters.

On Fri, Dec 7, 2012 at 12:58 PM, Bill's Email <silentav8r at cox.net> wrote:

>  I've been flying Intermediate with my Abbra with a Hacker C5-14XL (not
> the comp version) for a while now. For Intermediate flying/practice I
> generally use around 2,800 mAh of capacity for a 7.0 minute flight. I was
> using 5,000 mAh packs but recently switched over to 4,400 20C cells. My
> packs are never hot and rarely exceed 110 deg F. I have a claculated
> average load of around 25 amps. I am only using 65% to 70% of the pack
> capacity.
>
> So for me, my pick is a 4,400 20C pack. Works perfectly. I've been using
> the Sky Lipo from Hobby Partz and at $45 a pack ($90 for a 10S) it is hard
> to go wrong with them.
>
> Just another data point.
>
> Bill Malvey
>
>
> On 12/7/12 10:37 AM, Larry Diamond wrote:
>
>  OK, play nice... Never dealt with electrics before... I could be way off
> base, but here is a stab at it...
>
> Is my math flawed?
>
> Motor - Himax 6330-210 F3A Motor (210KV)
> ESC - Phoenix Ice 80HV - New V2 Version
> Battery 10s - 37VDC
>
> Plane - 2M Monolog
>
> Max power range is about ~2,700 to ~3,000 watts with this set up...
>
> Calculated Battery Discharge Rate = 80Amps (ESC rating) divided by
> 3,500mAh (battery capacity) = 22.9C
>
> Based on this math I suspect that a 30C dicharge rate is good on paper...
> additional discharge performane = $$$ and I don't want to spend money on
> battery performance I don't need...
>
> Class - Intermediate
>
> What is the recommended battery capacity and discharge rate...?
>
> I understand the many variables associated with the answer like, prop
> size, temps, wind, throttle control, yada, yada, yada...
>
> I would like to fly the Intermediate sequence a couple time without
> having to refuel electrons...
>
> Larry Diamond
>
>
>
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