Because of the technical problems with the Walter drive, primarily the extremely poor fuel efficiency, this TYPE went back to the conventional power train and modified the hull to fit it all in. The battery capacity was doubled because the electric motor was almost as powerful as the Walter turbine it replaced. None of these TYPE XVII-E submarines were ever built, but it was the basis for the later TYPE XXIII coastal submarine.

Displacement 340 tons
Dimensions 144’ x 10’ 9” x 14’
Machinery Single-shaft diesel/electric
Power (diesel) 900 hp
Power (electric) 1,160 hp
Speed (diesel) 11.5 knots
Speed (electric) 14.5 knots
Bunkers 40 tons diesel
Range (diesel) 6,000 miles @ 8 knots
Range (electric) 224 miles @ 4 knots
Tubes (fwd) two 21 inch (aft) none (carried four torpedoes)
Guns none
AA Guns none
Crew not known