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-   -   lipo c rating recomendation (http://www.rccrawler.com/forum/electronics/125657-lipo-c-rating-recomendation.html)

bent70 07-01-2008 09:49 AM

lipo c rating recomendation
 
I am running a mm/ bm9 combo and would like to know what c rating I can get away with? I was looking at some cost effective 3s 8c lipos and was wondering if I am safe with that low of an amperage overhead. The bm9 is really no bigger than a 400 size motor...I just don't know how many amps it draws.

JohnRobHolmes 07-01-2008 09:52 AM

I would get a pack of at least 25a continous, but it really depends on your terrain. That little motor can burst about 55 to 60a under stall. Mostly it won't get above 15a.

bent70 07-01-2008 01:06 PM

I tossed it on the watt meter with a tenergy 6cell 3800 pack still in car. I was getting 3-6 amps and from binding the tires and making the slipper slip I peaked at 17.8 amps @ 96watts.

JohnRobHolmes 07-01-2008 01:22 PM

The watt meter will average the current requirements over one second intervals. The higher bursts will happen in the 1/10th second range, and will not be caught by a standard wattmeter. I still recommend a pack with at least 25a continuous.

bent70 07-01-2008 05:48 PM

Ok, thanks for the input.
Now my only problem is finding a lipo that will fit my dimensions..
3.5"L x 2"W x 2"H that is more than 1200mah.

Tanis 07-01-2008 07:07 PM

Holmes has what you need"thumbsup"
http://holmeshobbies.com/product.php...&cat=10&page=1

bent70 07-01-2008 07:47 PM

I just ordered some chinese 30c 3s 1500's...reviews looked good, but I'll see for myself. Dirt cheap and yes I know you get what you pay for, although its worth a little for experimenting.
Those are new on Holmes' site....mabey if these don't work out."thumbsup"


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