daveka

Hi

I just purchased a used Sig Somethin' Extra ARF. I am putting a 40 2 stroke Enya on it.

I would like to know if anyone can tell me how far back from the front of the wing the CG is supposed to be for good flight?

Ernie P.

My Feedback: (3)

Not trying to be a wise guy, but you can and probably will get some answers here. Some good, some better, some perhaps not so good. My question is; Why bother? Pick up the phone and call SIG. They have an excellent Technical Department; very nice people who know the planes they sell. My guess is they can give you the BEST answer. Why solicit any other? Thanks; Ernie P.

w8ye

My Feedback: (16)

You can get a rough guess by balancing it on the main spar until you get in touch with Sig

ChuckW

According to Tower's listing, it is 3.5" from the LE. That sounds correct from what I can remember.

http://www3.towerhobbies.com/cgi-bin...?&I=LXZL44&P=7

Deadeye

Start on the spar, but you will probably end up moving the cg 1/4 to 1/2" behind the spar.

w8ye

My Feedback: (16)

Do this by flight test.
The farther back within reason the CG, the better the performance
But there is a point reached where the plane begins to get squirrelly on approach to landing and the up-down elevator reaction starts to become more difficult.
This is when you move the CG back forward one increment.
Only move the CG 1/8" at a time

dan v

I have that plane too. I using a thunder tiger pro .46 on mine. I'm balancing mine about 3 1/4. Hope to do maiden flight this weekend, I'll let you know how it goes.

dan v

Flew mine 3 times today, lands like a dream! Everybody liked this plane.