Power Question for BrianG, or other who may know

[TexasSP]

I have seen ya'll out there before, and snellemin invited me to go, Sundays are just tough for me somtimes. I would like to go sometime though.

The setup I was speaking of was effectively referring to Patrick with CC's MMM on an e-maxx going 70 mph. The real conversation came from the fact that a guy on the Traxxas forum insists that nimh hold better voltage under load than lipo while everything I have seen and experienced suggests the opposite. Anyway, the main deal is that he is a vendor who has a lot invested in nimh technology (although he does sell kokam's on a small scale) which I believe is the real motivation for his "theory". Also, in all his tests (which I have never seen data for) he claims to test at 20 amps constant. Well for me I think that is a joke as it does not provide a "real world" scenario with spikes, bursts, braking, etc. Anyway, it's over now, life goes on.

[zeropointbug]

100 amps in WAY to high for 70mph cruising. If my emaxx took 280 watts on medium grass to cruise at 45mph, then to go 70mph, you should need ~750 watts continuous.

[TexasSP]

Originally Posted by zeropointbug

100 amps in WAY to high for 70mph cruising. If my emaxx took 280 watts on medium grass to cruise at 45mph, then to go 70mph, you should need ~750 watts continuous.

If you look at the link below, you can see though that the resistance and power required going from 45 mph to 70 mph goes up substantially. While I know this is in reference to cars it the math is applicable. Then factor in the added drag of the e-maxx body and poor aerodynamics.

http://autopedia.com/stuttgart-west/...Physics06.html

I am not saying your wrong, just saying that there is a lot to factor and I actually learned a lot from that page.

[BrianG]

Originally Posted by TexasSP

...http://autopedia.com/stuttgart-west/...Physics06.html...

Your link is dead.

While I agree somewhat with ZPB that it probably doesn't take 100A to "cruise" an emaxx at 70mph, the current would still be substantial due to wind and drivetrain drag.

Plus, due to radio range issues, you won't have very much cruising time at 70mph unless you are driving a real car alongside it.