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

Get in touch with RC Ignition. You can PM him here at RCIGN1. Talk to him about his light weight G-26 and a couple of other engines he markets. All are superior to the Evolution, and his G-20 ignition change is much better than the one that comes stock on the G-20.

Borna,
The stock configuration according to your figures comes to 20.5 oz. per square foot. If you increase the weight to 163 oz., your wing loading would be under 24 oz. / square foot. You just have to do the math to determine if it is within reasonable limits. 25 to 30 oz. per square is good for a model of this size.

Dave