Hi everyone well I got a sig somthin extra and have most of it built the problem is that this entirer build has been done with no plans or instructions well I did have the blue print of the wing but thats it but I am just not sure where they call for the CG. Thanks in advance Ray

Cut-n-pasted from the SSE manual downloaded from the SIG website ...

<blockquote>Center Of Balance
Like all R/C models, the Somethin Extra was designed to be flown with the proper Center of Balance (or CG). As shown
on the plans, the CG falls exactly in the center of the 1/4" wing spar, or 3-1/2" back from the leading edge. As previously
mentioned, this design allows for a relatively huge shift in the location of the airborne battery pack. However, if for some
reason you find that your model is still either nose heavy or tail heavy, consider some of the following suggestions before
resorting to non-functional lead weight.</blockquote>

Thanks I guess I should have thought of that

I have built 3 SEs. All of mine were quite tail heavy. I am using an OS55AX with a chromed brass,(heavy), propnut/spinner. I have a 6 volt battery under the fuel tank and against the back side of the firewall. I still needed 3 oz. of lead on the motor mount.