My brushless Revo

[Finnster]

Originally Posted by coolhandcountry

5s lipo is only a maxx of 21 volts. So the peak voltage is about the same.

True. the caveat is that the NIMH peaks about 1.4V right off the charger, but quickly drops as soon as you run it. The lipos will maintain that voltage for a while. From the discharge graphs I've seen, NIMH cells will drop to about 1.1V under heavy load, so running voltage is only 16.5V. The lipos will be quite a bit higher, 18v maybe, more?? I don't know that I'd abuse the esc as such as a routine.

Bit of a moot point as I don't have any lipos. :) What I was trying to test out if it could handle a 5s2p pack of A123 cells. From their graphs they seem to put out 3.3v under load, which would equate 15 cell NIMH. However these cells don't peak as high, 3.6V, (conversely drop as much voltage) so would keep peak voltage at a "reasonable" limit of 18V, or perhaps a touch higher. In this case the lower cell voltage is actually an advantage I'm thinking.

I do have a pair of 8 cell packs, so I may do it just for a quick speed run, but I think I am playing with fire (hopefully not literally. :036: ) Going by what BrianG said about electronics, (who seems to know his stuff, an EE maybe?) a safe zone would be about 80% of rated volatage as a max. The parts I can see are rated at 25V, so that is really 20V max. 16 cells would be ~22.4V peak, so... *Prolly* ok for a single speed run, but not good for any longevity. From what I've seen on the Rustler, at these speeds, added voltage really becomes a diminishing return. The top speed may only go up ~2 mph, but create quite a bit more heat. Either way I'll really need to get the camera out to get the action, for better or for worse.

[Finnster]

Short little vid of my BL Revo in a parking lot. Mostly wheelies and high speed passes, but a grabbed a few good jumps at the end until I popped the shock end off on a bad landing.

My camerawife bailed on me, so its just on a tripod. Would have liked to zoom and pan, but that will have to wait for Vol 2!

Enjoy!

http://www.youtube.com/watch?v=tkm3w-Z-Nmg