Arguably the best way to make lightweight, warp resistant and stable tail surfaces is by gluing together (laminating) thin strips of A-grain balsa around a (waxed) cutout form of the structure outline. Hobby Specialties offers for your building convenience, a variety of commonly used sizes of laminating strips. These will typically be in the 4.5-6# density range.
Balsa Laminating Strips

Balsa Laminating Strips

Arguably the best way to make lightweight, warp resistant and stable tail surfaces is by gluing together (laminating) thin strips…

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