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snellemin · 11:42 AM

475A sounds about right, as posted before. Why don't you do a 30 second burnout and datalog the ampdraw. You could then see the corresponding voltage under load. You can get a pretty good idea what your battery is capable off with your particular setup.
Do you still warm up your batteries before a run to reduce the IR of your batts? Do you cool down(spray it with something) the ESC at the Tree, so you get the most out of your ESC in that 1.4 second run? Do you have caps added to the MMM?

pinkpanda3310 · 07.30.2010, 10:01 AM

Quote:

Originally Posted by snellemin

Why don't you do a 30 second burnout and datalog the ampdraw. You could then see the corresponding voltage under load. You can get a pretty good idea what your battery is capable off with your particular setup.

That's a good idea. How about a home made dyno? Get a trolley wheel or something the same weight as your car and rig it to the back wheels. Add a brake to it to simulate wind drag. Might not be worth the head ache to make but just a thought. I'm not an electrical buff (I know, surprising isn't it

) but there must be a more accurate power analyzer you could use then. The weight of it is no longer an issue.

SunnyHouTX · 07.30.2010, 10:39 AM

Quote:

Originally Posted by snellemin

475A sounds about right, as posted before. Why don't you do a 30 second burnout and datalog the ampdraw. You could then see the corresponding voltage under load. You can get a pretty good idea what your battery is capable off with your particular setup.
Do you still warm up your batteries before a run to reduce the IR of your batts? Do you cool down(spray it with something) the ESC at the Tree, so you get the most out of your ESC in that 1.4 second run? Do you have caps added to the MMM?

A burnout won't put the same load as a fully hooked launch. As for battery warming, I only do it on days that ambient temps are in the 70s or lower. I like my packs to be around 95 - 100 degrees where I seem to get the best results. And no special cool down of the ESC and no extra caps either, even in the 1.3 second passes I've done.