Clarifications to the GT12 Rules

[terry.sc]

Originally Posted by LongRat

Mark, we do disagree, I have stated my opinions so we can leave it at that. This is something we do agree on!

My workings come from this:
1S and 2S cars lap a track at a similar pace. They therefore are producing similar power levels. 1S car does so at half the supply voltage, so must draw about twice the current to achieve this. Resistive losses scale as the square of the current, this is where the extra heat comes from. Your 45A speedo will not restrict the current flow to 45A. It might just overheat if the continuous draw exceeds this value though. Instantaneous spikes of somewhat over 100A are very likely. Modern cells can take this, but of course the 1S system NEEDS to be heavily loaded up (geared) to get any performance out of it so it isn't doing the battery any favours. In an era where people are so conscious of battery safety, this appears to be a strange move.

If 1S/13.5T is as marginal as you are implying, how come 1/12th seem to manage fine running 4.5T motors on 1S for 8 minute races and the bigger and heavier WorldGT cars are happily running 1S/10.5T. I don't see 1/12th or WGT racers regularly replacing their batteries.

I use Loong-Max 2300 2S batteries in a solid machined case that I manufacture and sell.

So, for all the protestations about needing to have a set of BRCA rules to follow for 2S, you are then using a soft cased micro pack that you would only be allowed to run at a BRCA micro class meeting. If there was a 2S GT12 class at the nationals you would have to run a BRCA legal hard cased pack.