not to trie to take over the topic or annything but some info i found while reading a book abaout 2 ww:
for hitting German convois and targets/incerting agents on the norwegian coast and including D-day. The British/Norwegians used MTB`s for this work.
they tested alot of different types of MTB`s (motor torpedo boat`s) but the one they found worked best was the "D" class worked best for the mission profile for this boat. 117.5 m long, 110 tonn deplacement, 4 1250 hk engines. top speed in best conditions is 32 knot(sp?) max range on 2 engines was 900 nautical miles at 18 knots.
arments was as follows: 2* 53 cm torpedo tubes, 2* sinkmine trowers, 2* 57 mm canons, one double 20 mm Oerlikon cannon, 2* double 12.7 mashinguns, 2* double 7.62 mashinguns.
in severe wheather they had to drop speed to 8 knots, and in *realy* bad wheather they had to seek port.
not shure if this one is one of the "D" type but this one is used in this types of missions; H.M.M.T.B 718 "LoneWolf".
MTB "626" sunk <Altenfels> in a few minutes on the 5`th of june `43.