// The Estes A8-3 and C6-7 motors have diameter of 17.7 mm,
// length 69.5 mm. The Estes Alpha launch pad has rod diameter 3.4 mm.
// The Estes A8-3 and C6-7 motors have diameter of 17.7 mm,
// length 69.5 mm. The Estes Alpha launch pad has rod diameter 3.4 mm.