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Old 05-30-2014, 09:00 AM
  #8  
OhD
 
Join Date: Oct 2002
Location: west hills, CA
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Originally Posted by Jetdesign
Thanks Verne. That is pretty much what I was thinking. I started this thread thinking there might be a quantitative test to check for CG, but really it's a balance of motor thrust, CG, and wing incidence (hence the triangulation). I read through Bryan's method thoroughly after I started this so I have a pretty good understanding of what I need to do now Looking forward to seeing you and everyone else in a few hours!
Think about this. Let's say your plane is quite nose heavy and needs up elevator trim to fly level. You can increase the wing incidence until it flies with no up trim but you still have a nose heavy airplane. Will you be happy with it?

I'm no aero guy, but it seems to me you need to start with the cg in an acceptable range that can be calculated based on the MAC. You don't want too much incidence in the wing or too much downthrust. Then read Verne's recommendation's to fine tune it.

Jim O