The U-Boat and Kleinst U-Boat Project

[Alpha Von Burg]

I agree that 26 knots might be a lot and that underwater speed would have been sacrificed. Then again, this boat would seem more fit for surface attacks than submerged attacks.

Also I doubt that a fully operational model was tested and achieved a result of 26 knots, its more likely that it was a test without the turret and ammunition on board.