Hello all,
I'm interested to buy Sport Wings 90 http://www.thewingsmaker.com/airplan...php?code=GA011
The specification says
Wing Span 81 in,
wing area 1020 sq in
Flying weight 9 lbs
Fuselage length 61 in
Engine Required: 4-stroke .91.

My question is to know if it is possible to use a gas engine instead of .91 glow?
The engine I'm interested is either Evolutio 26 GT or Zenoah 20 CC.
The weight of these engines are about 41.6oz with muffler, ignition, and mount. The 4 cycle .91 is about 23 oz.

So we're talking about 19 oz difference in weight. Do you think the plane is going to be very heavy to fly?

Thanks
Borna