Wonder what the power system on this is...

Got it on another video : This L-39 is powered by a RC Lander 64mm EDF, Turnigy 2200 mAh 4 cell 40-50C Li-Po battery and a Turnigy 40A ESC. And has a flying weight of about 1.2kg.

This much thrust on a 64 mm EDF   . Must be a metal EDF fan plus 500 Watts.

The way he is taking off without the Landing gear on the grass is amazing and absolutely fantastic flying.