New test with two of these in series...
Turnigy nano-tech 2200mah 2S 35~70C Lipo Pack
http://www.hobbyking.com/hobbyking/s...dProduct=11943
Voltage: 4s2p
Top speed: 71 km/h
Motor temp: cool (but only 60 s runtime)
This time there was not any sign of lipocutoff. I did two max. speed passes. Both enend to flips, so the 71 km/h speed is most likely not the best from this setup. The servo broke after the second pass. One plastic gear broke. At least the second pass ended when nose rised nicely upwards.The weather was not optimal, a bit too rough. I am not really familar how much you can change the behavior with strut adjustment.
Other thing I changed since the earlier post was that I did some propeller sharpening and polishing. There was not any clear problem with it earlier I just did it when doing the same for few other propellers. Im not sure if this can explain why the 3s 2,2 Ah 65C battery didn't work last time. Unfortunatelly I didn't have a chance to test it now.