Montana, 3rd printing, 1995. Vi + 270 pp., photo-ills., + ills. D.j., 26 x 18cm. FINE. This book explains how Germans designed, constructed, tested and mass-produced a revolutionary aircraft ' the Luftwaffe's Me-163, known as the "Comet" which used an internal rocket to gain flying speed before returning to earth as an unpowered glider.