The HMC Mine. This mine was to be a torpedo-shaped HMA equipped with an elec-tric propulsion system and electromagnets. It was contemplated that the mine would be guided and affixed to the target ship by a swimmer who would be towed by it.

Description

Case material

Iron

Length of case

144 in.

Diameter of case

24 in.

Weight of charge

220 lb.

Method of propulsion

Electrical motor powered by U-boat type wetcell batteries

Range

12 miles

Speed

3 knots

Method of firing

Same as HMA