Harvey the main difference between the Sweet Stik and the Ugly Stik is the size. The sweet Stik has a 54" wingspan the Ugly Stik has a 60" span and the Great Planes 40 size Stik is a 58" span. I like the Sweet Stick because they will fly just fine with a plain bearing 40 like an FP 40, a TT GP 40 or one of the excellent Tower 40s with the bushed shaft. Plus any bearing 40 is just that much better. The GP Stik is probably better with a 46 sized motor.
Thats one of the plusses to a Stik model, a big engine isn't needed. When I built my Sweet Stik back in about 1979-80 first flew it with an OS .30. Not great but it wasn't bad. I later came up with the scratch for an OS bearing 40 and that was all the engine I needed.
http://www.rcmplans.com/index.php?ma...oducts_id=1753
It looks like the seller of my plans borrowed the photo from RCM for his ad.