Type XXVIIB
As the orders were being placed, Hecht variants were under construction. The first was the Type XXVIIB, which had a greater range, could carry two G7e torpedoes, and had diesel/electric propulsion. The design was completed at the end of June 1944 and resembled Hecht but had a better boat-shaped external casing for improved seakeeping while surfaced, and saddle tanks. Additional room had been made inside the pressure hull by moving the batteries to the keel, while the two torpedoes were slung externally in recesses in the lower hull. A 22 hp diesel engine was fitted for surface use and was estimated to give a surfaced speed of 5.5 kn (10.2 km/h; 6.3 mph), with a 25 hp electric motor providing a submerged speed of 6.9 kn (12.8 km/h; 7.9 mph).
The final variant of the Type XXVII was the Type XXVIIB5, better known as the Seehund ("Seal") or Type 127. Seehund had a small raised platform midships with the air intake mast, magnetic compass, periscope, and a clear dome which could survive depths of 45 m (150 ft). The submarine's fixed 10 m (33 ft) periscope incorporated lenses which let the commander check the sky above for aircraft before surfacing.
 Type XXVII B 5 (Seehund) midget submarine | |
| Class overview | |
|---|---|
| Builders: | Germaniawerft, Kiel |
| Operators: |  Kriegsmarine |
| Built: | 1944–1945 |
| In commission: | 1944–1945 |
| Planned: | 1,000 |
| Completed: | 285 |
| Active: | 138 |
| Lost: | 35 |
| General characteristics | |
| Displacement: | 17 long tons (17 t) submerged |
| Length: | 39 ft (12 m) |
| Beam: | 5 ft (1.5 m) |
| Propulsion: | 1 x 60 hp Büssing Diesel engine 25 hp AEG electric motor |
| Speed: | 7 kn (13 km/h; 8.1 mph) surfaced 3 kn (5.6 km/h; 3.5 mph) submerged |
| Range: | 270 nmi (500 km; 310 mi) at 7 kn (13 km/h; 8.1 mph) surfaced 63 nmi (117 km; 72 mi) at 4 kn (7.4 km/h; 4.6 mph) submerged |
| Complement: | 2 |
| Armament: | 2 G7e torpedoes |
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