Thanks buildflycrash, I have posted this at Mud Duck Aviation (if you want to see what I am talking about go to www.mudduckaviation.com) and received "heavier engine" as one tip. I plan on using an OS 91 4-stroke (popular engine in these parts, and supported by LHS). I am not at all familiar with 4-stroke engines weight wise, and would be open to suggestions.
Thanks, Ron