Wonder what the power system on this is...
http://www.youtube.com/watch?v=LKb7-RGM5x8
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 :o :o. 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.