Many EndeavourCat owners do most of their own maintenance. Like our owners, we like to go boating, not do maintenance, so we do all we can to make servicing our boats as quick and easy as possible. Things like locating all filters and strainers in convenient, easy to get at places, making sure that engine access is as good as physically possible to achieve. And we include electric oil pump-outs for both engines and the generator, making oil changes quicker and much less messy.
The engines are located under the bunks in the aft staterooms.  Access for service is excellent.  In addition to the door access the front of the engine, the whole top of the engine compartment lifts off and there is actually enough room to stand in the engine compartment while you're servicing them. 

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The EndeavourCat 44 is powered by twin 29 hp diesels.  Each engine has its own 90 amp, dedicated engine cranking battery and 55 amp alternator.  Engines, transmissions, fuel filters, engine room blowers, battery disconnect switch, engine battery parallel switch, seawater intakes and strainers are all located under the bunks in the aft staterooms.  As you can see,  there's plenty of room to reach everything during maintenance. Cruising speed is around 8 knots.  The 120 gallon fuel tank gives you a cruising range of well over 600 miles.
Most of our sailing cats used sail drives to get the power from the engines to the props. The system worked well, but we were not satisfied and eventually went a different route. Our later sailing cats had a straight shaft drive system, which turned out to be a simpler, more efficient solution. Both systems drove folding props that reduced drag when under sail.