Thanks a lot for the reply ... this is really useful info ..
On another note .. there is something interesting I've noticed in this hybrid Quadrocopter and I'd like to share it with you and see if it is really possible
During my study of the videos I've noticed that the Radio program used to fly this hybrid MR is a HELICOPTER not a FIXED WING as it should , and also I examined it thoroughly and I couldn't find a flight controller .. so the conclusion is.... This smart guy is flying this Hybrid MR without a gyro .. using a helicopter (90 degree swash mixing) and maybe the center engine provides additional stability .. with its weight being the majority of the AUW ....
Please correct me ..
Update :
the man himself just told me that he uses an FC .. but why use a helicopter program instead of fixing wing as all FCs require I assume
Khaled