Quite often when we hang a big gas-burner on our favorite model, it comes out nose heavy. Most likely, we didn’t check the C.G before covering, so now we’re faced with cutting a hole back near the tail for the addition of ballast.

Why not plan ahead? During construction, build a small ballast box as far aft as we can; use 3/32” balsa sheet for the top, ends, and sides. Frame it on the bottom with 1/4” square balsa. Now cover the fuselage a usual.