I just don't thick you have to go for so many cc's with that type of aeroplane. We've just started experimenting with an F3a aeroplane equiped with gass, a ZDZ40. Man more than enough power... I mean so much it was basically unusable.

Don't seen to think weight is an issue anymore..
noise is. We have to work out the pipes (re. mufflers) and the soft mounts... need a total new thinking here as the old Hyde and a nose ring approuch dosn't work any more... then its props... which effect under cart lenth...ahhhhh etc etc.
Weight isn't an issue.
As stated.. 50cc on an 11lb model? 40cc was total over kill... in a nice way....
Not at all nessessary unless your in love with 11 degrees of right thrust.