British Bomb, 500 lb MC, Mk 1, Mk 2, Mk 3, Mk 4, Mk 5, Mk 6, Mk 7, Mk 8, Mk 9, Mk 10, Mk 11, Mk 12
The bomb has parallel sides, with an ogival nose and a slight rear taper, similar in construction to US General Purpose bombs.
With the exceptions as given below, exploder containers screw into the nose and base plate. Mk I: fabricated; rolled steel sheet, welded, with nose and tail welded on. Mk II: drawn tube; nose formed by “bottling" process; tail welded on. Mk III: cast. Mk IV: cast to 500 lb. GP dimensions. Mk V: same as Mk III, but center of gravity was off, so all were declared obsolescent immediately; used only with the long tail unit. Mks VI, VII, VIII, and IX are same as Mks I, II, III, IV, respectively, with American dual suspension lugs added. Mk X: forged body; solid nose; fuzed only in tail. Mk XI: Mk VII with a solid nose. Mk XII: Mk VII with improved welds at the after end, and fuzed both nose and tail.
The Tails No. 25 and No. 28 are similar in construction, each consisting of a cylindrical strut attached to a tail cone by four fins. The tail assembly is secured to the body by four spring clips which engage slots in the tail end of the body. Turnbuckle fittings are provided for two of the springs as a locking device. A reach rod running through the tail cone, engages the arming fork of the pistol, and carries the arming vanes at its after end. The arming vanes protrude beyond the cylindrical strut and the fins on the short-type Tail Unit No. 28.
Mks I-V of this bomb have a single suspension lug welded to the body, while Mks VI-XII have dual lugs for suspension from US aircraft welded on in addition to a single lug.
These bombs are supplied with a Tail Pistol No. 28 or No. 30, and may or may not be fuzed at the nose.
The short-type tail unit, such as the No. 28, Mk I, is used when the bombs are dropped from fighter-bomber aircraft.
Tail fins are usually painted red when time pistol is used.