Mk 10/11 Hedgehog A/S-morter Storbritannien

Rækkevidde: 230-250 m
Sprænghoved: 13,6 kg
Vægt: 13.000 kg
Synkehastighed: 7.6 m/s
Skudhatighed: 1 pr. 3 minutter
Ladning: 30 kg


In their war against the U-boats, the British developed an ungainly looking, multi-barreled weapon called the Hedgehog in January 1942 that fired a barrage of 24 -7.2" Mk 6 bombs (called projector charges), each weighing 75 pounds, in an oval pattern over a wide area. Before development of this weapon, submarine-killers employing depth charges had to pass directly over a submerged submarine. The Hedgehog was the first stand-off submarine killing weapon. The bomb was not a rocket, but was propelled up to 250 yards by an impulse charge of smokeless powder. The explosive charge consisted of 30 pounds of TNT, or 35 pounds of Torpex. Destroyer Escorts routinely carried 240 missiles which was enough for 10 launches. A reload took about 3 minutes. The missiles are loaded on cylindrical bars called spigots, six are attached to each cradle, with four cradles in the projector. These cradles are interconnected and can be swung about a fore-and-aft axis by means of a roll-correction gear assembly mounted on a gun-train indicator pedestal. This movement is limited, but allows enough movement to compensate for roll of the ship and to aid in leading the target. The charges are electrically fired by a ripple switch, firing the missiles in pairs every 0.10 seconds, with the highest trajectories being fired first so that all 24 hit the water at about the same time, this minimizing the submariner's reaction time. The Mark 10 and Mark 11 were almost identical, differing only in the shape of their pattern and range. The Mark 10 fired an elliptical pattern measuring about 140 x 120 feet to a range of 200 yards. The Mark 11 fired a circular pattern measuring 200 feet in diameter out to a range of about 188 yards.