Not a Cat but a Trimaran, very rich friend had a Norman Cross 48 Tri decided that his engine and prop were not giving him the speed he wanted, so he installed a Hamilton Jet.
(His tri similar to another friend's "Querida" - here's picture
Wow, we took off from shelter cove in Hong Kong and he decided that we would go clockwise around Victoria island and stop for celebrations at the Royal Hong Yacht Club in Causeway
Bay - well we got as far as Green Island when the engine stopped - no diesel !! Up with the sails, good breeze, HOWEVER
having removed the previous engine/transmission/prop-shaft/propeller AND RUDDER because the Hamilton jet in addition to providing forward thrust it also steers the boat.
VHF to the yacht club - 'please send 2 'jerry' cans diesel'. Needless to say when we finally sat down in bar - much ribbing.
Here's link to Hamilton Jet :- C L I C K