This modification to the design was going to again try the two Walter Turbines coupled to a single shaft and orders were actually placed with Germania Werft (Kiel) to build U-1081 thru U-1092 as TYPE XVII-G boats but the orders were canceled before building.

Displacement 314/345 tons
Dimensions 127’9” x 11’ 3” x 15’ 6”
Machinery single-shaft Walter turbine
Aux machinery 8 cyl Deutz diesel/electric
Power (Walter) 2,500 hp
Power (diesel) 210 hp
Power (electric) 77 hp
Speed (Walter) 25 knots
Speed (diesel) 8.5 knots
Speed (electric) 5 knots
Bunkers (AUROL) 55 tons
Bunkers (diesel) 20 tons
Range (Walter) 114 miles @ 20 knots
Range (diesel) 3,000 miles @ 8 knots
Range (electric) 40 miles @ 4.5 knots
Tubes (fwd) two 21 inch (aft) none (carried 4 torpedoes)
Guns none
AA Guns none
Crew 19