Originally Posted by
Checklst
I would go with the 20 or 21cc ............I have the VVRC 21cc(valleyView) on my Sig 4star 60 and if flys great....power is just perfect....a 15 would fly it but a 20cc ups the fun factor.
And you can buy the 20 / 21 engines at a much better price! Very little weight difference so that is not a big issue.
Be sure to use pinned hinges on that Ugly Stick. With a gasser in the nose, a wire braced tail might be advisable also. If this is an old Das Ugly Stick design, there are quite a few areas in the construction that could use some updating.