Estes Black Brant XII, Build Kit #9723, Body Tube Sizes

The three tubes in the Black Brant XII kit are:

Third stage - 29mm 1.2" O.D. (heavy wall tube) at 16 1/32" long

Second Stage - BT-60 tube (normal wall thickness) at 9 1/4" Long

First stage - BT-70 (normal wall thickness) at 6.13" long

The internal engine mount tube is another 29mm 1.2" O.D. (heavy wall tube) at 14" long.