[NSRCA-discussion] Going Electric - Battery Questions

[Ronald Van Putte]

This is a refreshing discussion.  I have been telling people for years that they don't need continuous discharge 35C, 45C, etc batteries because they would NEVER use it.  The response I often get is, "Well, more is better".  Certainly more $$$.  The Scottish ancestry blood in my veins boils when I hear that.   

Another thing that torques me is when Sportsman and Intermediate pilots insist of getting 5000mah packs because that's what the "big boys" use.  I keep trying to tell them that any capacity more than about a 33 % reserve above what their maneuver schedule requires is dead weight that shouldn't be carried around.

Ron

On Dec 7, 2012, at 1:18 PM, Atwood, Mark wrote:

> Hey Larry,
> 
> As everyone is telling you, the BIG difference between what you're proposing and what you're accustomed to with Glow is that you'll fly 90% of your sequence at half throttle.  Not figuratively half throttle... but literally half, or below.  Even a vertical upline does not need full motor on these setups.   Flying intermediate even less so.   Also, at full throttle you'll likely only pull about 75amps, so even 15C batteries would get the job done, but I would stick with 20 and higher.
> 
> 
> Mark Atwood
> Paragon Consulting, Inc.  |  President
> 5885 Landerbrook Drive Suite 130, Cleveland Ohio, 44124
> Phone: 440.684.3101 x102  |  Fax: 440.684.3102
> mark.atwood at paragon-inc.com<mailto:mark.atwood at paragon-inc.com>  |  www.paragon-inc.com<http://www.paragon-inc.com/>
> 
> 
> 
> 
> On Dec 7, 2012, at 1:37 PM, 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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