I finally got my L39 with Jetfan 90 airborne.
I made a short video of Maiden and Second flight.
My setup :
Jetfan 90, Het 700-68-1680, YGE 120 HV, 8s 5000
The sound is even better then i expected.
Sometime i start believing there's a real turbine in there.
I have to improve on the landings, don't know yet if i should move the CG a bit more foreward or add more exponentional on Elevator ...
But first improve ESC cooling between the ducts.