Originally Posted by SteveT.
Hey Jim....your or Joe's opinion of the nose heavy/tail heavy question about KE flight....
Most 3dhs planes are designed to have little to no KE coupling at a certain CG. You can adjust CG to get perfect KE and this will also be the prefered CG that the designer chooses. Some really poorly designed airframes will have KE coupling regardless of the CG.
If the plane is tucking towards the gear, it is tail heavy.
If the plane is tucking towards the canopy, it is nose heavy.
This all has to do with elev. trim. For example, a tail heavy plane will want to climb, so you trim in a few clicks of down elevator. Then when you roll to KE, the down trim in the elevator causes the plane to tuck towards the landing gear.
Always try to fix KE coupling with CG. If it gets to the point where CG isn't going to fix the coupling, or if you don't like the way the plane flys at the "preferred" CG then just find the CG you like and use the radio to mix out the coupling.