BrianG speed calculator question
 

Hey guys, when enter your lipo batterie voltage on the BrianG speed calculator, for exemple, a 3s li-po, did you enter 11.1 or 12.6????????????
I have always enter 11.1 before, but now, i think that i will put 12.6 volts, because the fully charge 3s pack is 12.6 volts and hold this voltage very long.........
Or for a more accuracy value, maybe 12 volts will be more realistic, no??:neutral:

I usually just enter the nominal voltage (#cells x 3.7v) and the at rest tire diameter. I figure that the tire balloning, and voltage drop will cancel each other out. I also radar all of my setups, and usually find that the speed calc is only 1-2mph off when I figure gearing as stated above.

I asked brian to add the > to the default ones to use for just that reason :)

That,s good, so i,ll continue to enter 3.7v/cell.

Thank you!

Haw are you supposed to predict your tire ballooning? I never understood that.

Yeah, use 3.7v/cell for most anything. True, lipos are at 4.2v/cell fresh off the charger, but they don't stay there long at all - just look at any graph. I just put higher voltages there for those who may want it for whatever reason.

BL_RV0: You are right, it is hard to know your tire ballooning value for sure. It's there so you can estimate changes in speed - particularly at higher speeds where ballooning becomes more of a factor. Ballooning is definitely not desired because of reduced control, but it is a factor. In short, use 0" for the minimum speed, but keep in mind that top speed may be higher and ballooning is probably the reason why.