The excellent engine. Has capacity of an order of 400 watt. Has established on trex-450, shows very good dynamics of flight and speed of lifting. The maximum return has received at established timing 11,5 degrees. Soft wires for connection ESC were pleasant, aren't subject to a break in difference from engines with rigid conclusions. At flights without крыльчатки coolings the engine is heated not strongly, nearby 60C at a lung 3D. I recommend for 400-450 class helicopters.