[NSRCA-discussion] Going Electric - Battery Questions

[Bill's Email]

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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