Mine is about 14 years old now, and still flies well. I have a Webra 120 two cycle in it and the vertical is virtually unlimited. I used Monokote, and the plane is in the ten pound range (too lazy to go out into the shop and look it up in my log book). If you just want to tool around and not do anything too demanding, a 90 two cycle would fly it ok. I'd still go with at least a 108 or preferably a 120. They fly well with a 120 four stroke too. It is a great airplane, and a shame that kits are not still available.

Clair