I have 2 choices for my Goldberg Ultimate ARF; OS 1.08 or OS .91 4-stroke. The debate is power vs weight . I have read the threads that have previously discussed the issue, but want to get your experienced opinions again. Would the plane fly well with the 4-stroke .91? Isn't the OS1.08 with muffler getting to heavy for the plane?

I am especially interested in the opinion of flyer who have owned and or flown this biplane with various engine combinations. Thanks for your help.

Redcatcher.