I know of several diesel
boats converted to outboard. I wouldn't rule
out a diesel
(in fact looking at one right now) but all else being equal I would take the outboard powered boat.
Your diesel vs outboard argument made sense 25-30yrs ago when you had a monohull
with a 2 stroke
outboard bolted to the back easily submerged where you had to pre-mix 2stroke oil
, outboards got 1/3 the fuel
economy and solar charging
was cost and space prohibitive while the engine
may only put out 2-3amps and any leaks
in the fuel
system were destined for the bilge
In todays world, 4stroke engines are pretty close on MPG, running an expensive diesel for a 1000hrs per year at the worst possible speed just to charge the batteries, is a fading method with solar
being more effective. Gas tanks
built into the bridge decks allow for bottom venting (similar to cars which no one is paranoid about) Catamarans are light and ride atop the waves so swamping the engine
isn't a major concern if the boat was designed for them (of course if you swamp the air intake on a diesel, you have the same issue). Sailboats are by nature redundantly powered, you have the motor
and the sails
. Assuming you have a dingy with a motor
, you have a 3rd level of redundancy by either hip tying the dingy or adding a spring loaded motor mount to keep the dingy motor on while sailing.
The main reason to go twin engine is not for the guy doing long open water
passages followed by months anchored out. These sailors don't need the fine control provided by twin engines. It's the inexperienced marina sailors who benefit from the control provided by twin engines.