I meant to say foamboard, not sunboard. Above post updated.

Read a few posts starting from here :

http://www.rcindia.org/rc-general-topics/can-a-flat-wing-glider-fly-with-only-motor-on-it-just-one-channel/msg24971/#msg24971 

After seeing what biofoam / foamboard as it is available locally in India and real depron, the difference is huge.   

Well.. Too bad that i cannot experience the real stuff..
However once at a Clas Ohlson store in Oslo i saw a sheet material marked as Depron that was rolled up and looked like EPP.

That is one of the big differences... true depron handles bends much better than biofoam.

Did you fly the Beaver ?

Yes I did... the experience was bad... I crashed it around 10 times before sparing its life.. later i came to know that the reason might be that it could never achieve flyable speed coz i was taking it off from grass. Had no previous flying experience. but then I was able to fly my friends Dolphin glider reasonably well and realised what went wrong.. Ill upload the videos and would appreciate if you could guide me.. I really love that plane and would like to continue with it..