When I launched with the rear CG is was almost uncontrollable - wanted to stall and was very touchy on the controls. It does climb with full throttle but I think that's due to the incidence on the motor mount being off, not related to CG. I moved the CG forward and now it flies really well.
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Magnus Electric Build Thread
- Thread starter Lothar
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Konrad
Very Strong User
So, what is your CG value?
To check thrust line I trim for level at full throttle and at speed. Flying level I slam the throttle shut, if the plane jumps up at that instant I have too much down thrust. If the nose drops I have too much up thrust.
Remember slamming the throttle shut removes the thrust that the elevator trim is countering. So if the elevator is fighting down thrust with a little up elevator for level flight. Removing this thrust will allow the elevator to pull the nose up.
Oh, the first thing is to set the CG using the dive test. Having a nose heavy ship will result in having to set the elevator with "Up Trim". This makes it very speed sensitive as to finding a stable trim setting. It will want to climb as the speed of the model increases. (I think this is what you are saying)
If the model isn't divergent: control sensitivity usually is as a result of too much control movement, not aft CG.
To check thrust line I trim for level at full throttle and at speed. Flying level I slam the throttle shut, if the plane jumps up at that instant I have too much down thrust. If the nose drops I have too much up thrust.
Remember slamming the throttle shut removes the thrust that the elevator trim is countering. So if the elevator is fighting down thrust with a little up elevator for level flight. Removing this thrust will allow the elevator to pull the nose up.
Oh, the first thing is to set the CG using the dive test. Having a nose heavy ship will result in having to set the elevator with "Up Trim". This makes it very speed sensitive as to finding a stable trim setting. It will want to climb as the speed of the model increases. (I think this is what you are saying)
If the model isn't divergent: control sensitivity usually is as a result of too much control movement, not aft CG.
Last edited:
Hill Hobbit
Very Strong User
Where do you have the cg now, and how did you measure it?
Hill Hobbit
Very Strong User
Looks like this is going nowhere…
JustinMader
Active User
I've never heard checking thrust angle explained this simply before, this is great advice.
