Hi, if you really want to split hairs and be pedantic some of the British MTBs had 5 engines - two American V8s used for cruising and silent running, along with the 3 main engines, used for when you got up and WENT after your target
Going to have to do a quick amendment here - had to get me little Bible out
- to do some checking - and, it was the Thorneycroft boats which had 4 R.Y.12 Thorneycroft engines 650 h.p each, on 2 shafts Auxillary engines were two Ford V8s. The other V8s, on the other MTBs tended to be for electrical supply and not for silent running.
There are a series of boats which were fitted with 3 Isotta-Fraschini, 1,200 hp engines each centre engine geared, wings direct drive. Certain boats were fitted with Ford V8 cruising engines on the wing shafts.
John
John - note to self don't start typing first thing on a morning - til coffee fix arrives