Advice from folks who suggest modification based on a proven design is good. That's how we do it whenever possible. Starting with a known airframe we change one thing...evaluate...change something else...evaluate...and so on. It's possible to start from scratch but unless you're very lucky you should to be prepared to build more than one prototype. That's our experience. It requires expert knowledge to troubleshoot a scratch design not to mention a healthy dose of reality check and perseverence to admit, "This version ain't it - back to the drawing board for another try."

Lee Davis
[link=http://www.piedmontmodels.com]Piedmont Models[/link]