ORIGINAL: CADgeek
Thanks again. Grey Beard I like the way you think. I was considering moving the firewall backwards because the length of the OS 1.20 is way more than the original design allows but your last post made me rethink this. I think instead I will readjust it to help compensate for the weight needed. Scale is great but not absolutely necessary for me.
That's my thinking. One of my friends and I went through this not too long ago. I built a big Boeing F4B-2 from plans some years ago. Even with the big OS 1.20 pumper I couldn't get it to CG, everything of any weight was right behind the fire wall and it still needed several POUNDS of lead in the cowl to CG. Last year I sent the plans to one of my friends and mentioned making the fues nose moment longer but he was shooting for that scale look. He ended up going with a 40cc gas engine with everything up front but did get it to CG. An inch or two of length on the nose moment would have made life easier for the set up. Also if you have any way of making the back of the plane from the CG lighter do it. On that plane I didn't and it's now just hanging on a wall, it never was a very good flying machine and was never fun to fly at all. The people at the IMAA events liked it on a fly by but that was about it.
Gene