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-   -   Alpha CG.. (https://www.rcuniverse.com/forum/arf-rtf-75/1051826-alpha-cg.html)

a68fan 08-13-2003 03:33 PM

Alpha CG..
 
Do I have a problem??

While doin' a little maintenance, I was flippin' through the manual and came across the part referencing CG.. So for kicks, I checked the balance @ 2.75 to 3.00" from the leading edge. WAY nose heavy.. Plane flies well here, but does have a tendency to nose down when rolling. Took +/- 2.5 oz. just ahead of the leading edge of the rudder to get her balanced.

Didn't take but a click or two down for level flight @ full throttle, but at reduced throttle, dives, and requires retrim up to maintain level.. Adding throttle, plane climbs. Reduce throttle, dives. Also on landing, has a tendency to "porpoise" right b4 touch down. Coming in a little "hot" is a bit worse..

Did I make sense??

Is a little down thrust needed, or just put it back the way it was...

After trimmed to level flight, plane flies well, with no tendency to drop the nose during a roll..

Thanks for looking!!!

RonM 08-13-2003 03:54 PM

Alpha CG..
 
Sounds like it's tail-heavy now. You could probably re-trim to compensate by changing thrust angle, throw, etc, but I think you should remove your added tail-weight bit-by-bit until it flies best. (By your standards)
You did say the plane flew well where it was balanced previously, right? :)

Ronm

a68fan 08-13-2003 04:38 PM

Alpha CG..
 
Correct...


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