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| BRITISH EXPLOSIVE ORDNANCE |
| Part 1 - Chapter 6 |
| Semi-Armor-Piercing and Armor-Piercing Bombs |
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S.A.P. 500-lb., Mks II and III (Obsolete), and Mks IIC, IIIC, and V (Service) |
| Data |
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Fuzing |
Mks II-IV, Tail Fuze No. 30; Mk V, Tail Pistols No. 28 or No. 30 |
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Color markings |
Dark green over-all; ½-in. white band 3 in. from nose; ½-in. red band 3½ in from nose; 1-in. light green band 8 in. from nose |
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Tail No. |
Mks II and III, No. 1 Mk I; Mks IIC
and IIIC, No. 4 Mk I; Mk V, No. 11 Mk I, or No. 27 Mk I |
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Over-all length |
62 in. |
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Body length |
41.8 in. |
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Body diameter |
11.5 in. |
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Wall thickness |
1.22 to 1.32 in at maximum diameter and 0.82 to 0.92 in at mini-mum thickness beginning 23 in. abaft nose |
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Tail length |
No. 6 Mk I, 21 in.; No. 11 Mk I, 29.4 in.; No. 27 Mk I, II, 9.24 in. |
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Tail width |
11.5 in. |
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Total weight |
490 lb. |
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Charge/weight ratio |
18% |
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Body Construction: The Mk V body is forged steel with a pointed nose and an open base, threaded internally to receive the exploder container, which is cemented in positi-on. The base of the body is threaded externally to receive the tail adapter, which is in form of a coned ring with four equi-spaced slots to receive the spring clips of the tail. Earlier marks were similar to the Mk V, with slight variations in the tail adapter. |
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Tail Construction: The Tails No. 27 Mks I and II are the short-type tail unit with arming vanes protruding beyound the strut and fins. The Tail Assembly No. 11 Mk I con-sists of a tail cone with a cylindrical strut attached by means of four fins. It is attached to the bomb body by four spring clips. The arming spindle engages the fork in the tail pistol. The Tail No. 1 Mk I used on Bombs Mk II and Mk III has no spring clips, while the No. 4 Mk I tail used on Bombs Mk IIC and Mk IIIC does have spring clips. |
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Suspension: A single suspension lug is secured to the body by four screws. |
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Explosive Components |
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Detonator – (See Part 2, chap. 4, Detonators.) |
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Exploders – C.E. pellet in Mks II - IV; C.E. only in Mk V. There is no separate layer of TNT around the exploder as in the 250-lb. S.A.P. Mk V. |
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Filling – Mks II - IV, 90 lb. TNT; Mk V, 89 lb. TNT. |
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Remarks: The Tail Fuze No. 30 has left-hand threads on the securing ring. Use of the Tail Pistol No. 37 is unlikely. |
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Tail fins are usually painted red when the Time Pistol No. 37 is used. |
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The Bomb Mk I is very old and will not be found. The Mk IV bomb was manufactured, but never filled. |
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Figure 26 – S.A.P. 500-lb. Bomb Mk V |
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