I seem to be very tail heavy. How far back from the wing le. for balance point?
I dont have a manual, plane was a gift.
Thanks, Charlie

If the info is not listed at http://www.sigmfg.com you can call or email them for CG, control throws, etc. If you're wanting info for the weekend I'd recommend calling on the phone. They may not check email before they leave for the day.

Hello there,
According to my manual, the CofG should be from 3 1/2 to 4 1/4 in from the LE.
Hope this helps.
Dan

Thanks

The CG depends on what you want to do and how the airplane flies. For the rank beginner, the forward setting works quite well in the following regard:
If the airplane is trimmed for level flight at a certain throttle setting you will find that excess speed (like in a dive) will recover faster due to the extra up trim in the elevator.

As the student gets more experienced and wants a more neutral aircraft, move the CG back and it loses some of the self recovery of the more nose heavy model. It also become more responsive to rudder input and will fly better inverted. The aft CG will also allow slower landings and smoother take-offs.

Just assembled my first glow plane (an LT-40). Mine was tail heavy also. We are going to add weight (fishing weights) into the nose to balance. Scale Freak is right on the balance point.

I'm tossing one of these together as well..
And,, major tail heavy..
Sooo,, I call SIG...
Spoke to a Mr. Bob Nelson..
His answer is: No way to balance unless a heavy motor and something
as a Higley prop nut... And no way to get the weight under the 6#..

Sooooo, Not wanting to add weight, and wanting to stay under the 6# weight
I am moving the wing back about inch and half...
Lighter is always better...
This plane is already a 'floater' and with less weight should float even more..

Hey Robby, Yes mine was converted to tail dragger, seems to have moved the landing gear way up. It also must have had a bigger engine on it before i got it. The evolution 46 i bought for it would just fall thru the engine mount. The evo 46 almost seems weak for this plane, it's heavy!

After we finished building mine, I was discussing the weight issue with my son-in-law and he had a good theory. Manufacturers keep building lighter and lighter engines, which is a good thing, however when you put the lighter engine on an older design (which was built with heavier motors in mind), then it makes it tail-heavy......just a thought.

dwilt72
This is true.. However, reading the manual included with this particular
plane it gives an AUW of 5.5 - 6 lbs.
The one I am doing is definately over 6 lbs and a buddys is 6½ lbs...
With calling SIG thier tech guy says no likely to get it under the 6lbs
**as the manual** says..

At 6½ these things still lfoat like a kite.. I just was hoping to be even
less so it would float even more..