Will try to make a long story short. Last winter I finished building a Mills 1.3 diesel. While building I was hoping it would run but didn't expect much. It runs better then I ever expected. I felt It should be in an airplane. I had a 67 inch Quaker Flash kit for a long time. Decided to build it hoping the engine would pull it. Tried flying it yesterday. Not quite enough engine. Tried different props but the best it would do is fly in ground effect but no climb. I don't have time to build another airplane before winter. I want to continue flying the Quaker. What engine? Thinking About getting a MVVS 2.5 DFS/R. What do you guys think? Carlson shows them on his site for $120. Will a larger then recommended prop at a lower rpm hurt it? I don't need a lot of power. Like lo-n-slo flying best. Would like a good reliable idle. Thanks, Larry