Other sources mention a striking speed of 2,400 ft/s (730 m/s; 1,600 mph). (Johnsen 2003, p. 45, Burakowski & Sala 1960, p. 556) Johnsen, Frederick A. (2003). Weapons of the Eighth Air Force. St. Paul, MN: MBI Publishing. p. 45. ISBN0-7603-1340-7. Burakowski, Tadeusz; Sala, Aleksander (1960). Rakiety i Pociski Kierowane [Rockets and guided missiles] (in Polish). Vol. Część 1 – Zastosowania (Volume 1 – applications). Warsaw: Wydawnictwo Ministerstwa Obrony Narodowej (Ministry Of National Defense Publishing House). pp. 556–557. Figure 280, p. 558, provides a detailed diagram of the Disney bomb (with its internals).