Originally Posted by
RAPPTOR
if you balance a plane ,and lets say it needed 5 oz lead in nose !!! If you were to ,, move the wing ,,back..
Maybe 1 or 2 inches ,, no ballast would be needed !!!!
Same wing c/g point!!! Lololhahaha
Same?
nope
The CG that was wrong to begin with let's say was an inch too far aft. Let's say it was 6" from the prop nut, ok? I believe everyone would agree, there is only one CG and it's in the wrong place and that place is 6" back. So, tell us all how you're going to move a heavy component like the wing and not change the location of that bad CG. OK?
As for "same wing c/g point".................. There wasn't a correct one to begin with. There was a place the mfg suggested it should be. But the c/g that existed when you saw it would take 5 ounces to move the CG to where it belonged, moved forward didn't it. From one place to another. Two different places. And notice no mention is made of where it was on the wing.
You're playing with semantics, and not getting that right either.
But let's forget semantics.
The CG location helps determine pitch stability and the sensitivity of the pitch control. The real purpose of it's location is to insure the pilot can control the pitch and the plane is adequately stable so that same pilot's workload is reasonable. Pitch stability and controllability are a function of the horizontal tail for the most part. That's why the formulas include them.
If you look at the descriptions in the formulas online, you'll see static margins explained. Pay attention to them and what they mean, and you'll discover they help you set elevator throws based on your choice of margin.
So where did you come up with the idea that RC planes don't have a CG range? They usually don't have wings that can be adjusted forward and aft.