It needs to be stable before flying. I add some triangular balsa to the stab to fin and fuselage to stab joints. It makes for a much stronger tail and will last a lot longer. I just finished a Sig LT-40 with these and many other little improvements that I think make it a better plane. Not that it isn't out of the box. Just the way I do it after more than a few years in the hobby.

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