[NSRCA-discussion] Going Electric - Battery Questions

[Peter Vogel]

30C is more than enough, you can get away with 25 or even 20C continuous
rating, with the burst rating typically 1.5 - 2x the continuous rating.
 The fact is, in a typical sequence you are very rarely at full throttle so
your discharge is very rarely above 20C.  I fly sportsman with a Hacker
Q60-F3A (210Kv) and a 21x14 prop and my average discharge is about 9-11C
depending on the wind with max discharge around 22C.

Peter+


On Fri, Dec 7, 2012 at 10:37 AM, Larry Diamond <ldiamond at diamondrc.com>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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>



-- 
Director, Fixed Wing Flight Training
Santa Clara County Model Aircraft Skypark
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