The Grand Slam case was made of a chrome-molybdenum alloy steel and had a charge-to-weight ratio of over 43 per cent.Ĭonventional Avro Lancaster bombers could not carry the bomb and 32 Lancaster B.Mk 1 (Special)s with more powerful engines, a stronger undercarriage, without bomb bay doors and minus many items to save weight, were built.
Medium Capacity (M.C.) bombs were designed to remedy the shortcomings of General Purpose (G.P.) bombs, with a greater blast and casings which were robust enough to confer a considerable capacity to penetrate, especially the Tallboy and Grand Slam. The bomb was similar to a large version of the Tallboy bomb but a new design and closer to the size that its inventor, Barnes Wallis, had envisaged when he developed the idea of an earthquake bomb. The bomb was originally called Tallboy Large until the term Tallboy got into the press and the code name was replaced by "Grand Slam". The Bomb, Medium Capacity, 22,000 lb ( Grand Slam) was a 22,000 lb (10,000 kg) earthquake bomb used by RAF Bomber Command against German targets towards the end of the Second World War. Penetration: earth 40 m (130 ft) concrete 6 m (20 ft) unknown number used in post war trials.First bomb tested at Ashley Walk bombing range in the New Forest.A Grand Slam bomb being handled at RAF Woodhall Spa in LincolnshireĬlyde Alloy/Steel Company of Scotland, Blochairn, GlasgowĤ2 used, 99 built by Clyde Alloy and the A.
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