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voor de liefhebbers van midget submarines :)

GPM_262__-_U-Boat_Hecht_1-25
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The Hecht was inspired by the successful attack on British battleships at Alexandria harbor by Italian human torpedoes on the night of December 18 1941, that Admiral Donitz submitted a plan to build submersible weapons capable of undertaking such missions. The result was the Hecht, a two man midget submarine designed to carry a 800kg limpet mine at its bow which could be dropped under the hull of an enemy ship. 

Subsequent missions however required it to be fitted with a torpedo to attack moving targets. The redesign required the submarine to carry either a single torpedo under its hull or a mine at its bow. Fifty three orders were placed, but construction was halted after three prototypes were built. Their performance proved unsatisfactory and it became apparent that a more promising version could be built. 

Powered exclusively by electric motors, the Hecht’s range of 65nm surfaced and 35nm submerged was too short for any practical purpose. A later version was planned where the Hecht would feature an exchangeable bow for carrying additional battery cells or two divers (instead of a mine), but neither of these were realized. Built by Germaniawerft in Kiel, the three prototypes were delivered in May 1944 but none of these saw action. Instead, they were relegated to training purposes. 

Hecht Type XXVIIA Specification 
Displacement 11.83 tons 
Dimensions
Length
Beam
Diameter 
34.1ft (10.39m)
5.6ft (1.7m)
4.3ft (1.3m) 
Top speed
Surfaced 
5.7 knots 
Maximum range 65nm at 5.7 knots 
Motor output 8.8kW 
Diving depth 164ft (50m) 
Armament One 21 inch torpedo or one mine 
Crew 2 
Number built 3 (53 planned) 

Thanks to SSBN :)