• Mark 10: elliptical pattern measuring about 140 x 120 feet to a range of 200 yards
• Mark 11: circular pattern measuring 200 feet in diameter out to a range of about 188 yards.
• Mark 15: pattern as for the Mark 11 but mounted on a platform adapted from that of a quadruple 40 mm Bofors gun mount. The Mark 15 could be fired remotely from the ship's plotting room.

[

See also

• Hedgerow, a land version of Hedgehog for exploding landmines as used on landing craft during the D-Day invasion.
• The Blacker Bombard and PIAT infantry anti-tank weapons and the Churchill AVRE's Petard demolition gun also use the spigot discharger principle.

[

External links

• Anti-Submarine Projector Mks 10 & 11 (Hedgehog)

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