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This has info on such designs:
That probably doesn't help you though.
I don't have any books on the matter and there is no information on the web.
Here's some more info, just intresting:
The loss of the M 381 has to be seen in comparison with the loss of her sister M 382 31.01.1945. That day the M 381 and M 382 sailed towards Bodö to escort the German tanker Ditmarschen, ordered back to Germany, but was attacked by the lurking MTBs MTB-715 and MTB-717. MTB-717 missed with both her torpedoes, while the MTB-715 scorted a hit with one torpedo 21:30 in the aftpart of the M 382 that sank in 2 minutes with 22 casualties. The MTBs claimed a destroyer sunk...
As the MTBs weren't seen, the loss was first belived to be a mine, but this was changed to a MTB torpedo when the withdrawing MTBs were reported.
12.02.1945 was the convoy with MT Ditmarschen (Trondheim - Aalesund voyage, with M 381 and R 238 as escorts) seen by the lurking MTBs MTB-716 and MTB-717, and both fired their torpedoes against the tanker. MTB-716 missed with her torpedoes, while the MTB-717 hit the M 381 at 22:45. The M 381 blew up, and sank imidiatelly with 45 casualties. R-238 took the tanker into safety, while R 122 and R 124 arrived later to search for survivors (only 16 men survived). The MTBs withdrew after the attack without being seriously shelled.
The MTB-717 was then involved in the sinkings of both M-381 and M-382. Both minesweepers belonging to the 22. MS-Flottille [minesweeper flotilla].