I tweak in the 3mm chassis, yikes
I know my fan is doing nothing worthwhile at the moment but I think te heatsink helps a bit, it still leaves most of the cooling slots uncovered.
The fan has never moved when I've used doubled sided tape, but I made sure it was a very clean bit, touch it once with your finger and the stickyness halves. I've tried strong velcro, it won't come off but it can lean over and touch the speedo or motor.
Gearing right does help the most, I agree, I think at Carlisle I was a bit over eager and over geared by a tooth on the pinion, swapped too much acceleration for top end speed on the last few meters of the straight, silly mistake
I really want to head down south and race on some of the nice permanent outdoor tracks down there, still not been to Teeside's but to be honest the layout looks a bit simple, for those nitro guys
If you want a one off meeting in September (12th) there's the Cumbria GP, 19turn at Carlisle