Have you considered electric
drive(s)? Quieter, not smelly. No massive fuel tanks
with all the pumps, filtering etc. No gearbox
. No dangerous smelly, exhaust
gases ever entering your boat
. Probably no salt water
heat exchangers needed (minimising hull
fittings). No possibility of over heating
. The possibility of power regeneration from the spinning prop. when under sail?
Now that electric
cars are all the rage, large battery
banks should be more readily available and the technology is now stable and reliable.
While at the construction stage the design work
could be aimed at maximising solar
(collection area-wise, shade provision etc.).
Having lived in the tropics for most of my life, I can assure you that good shade is essential. PV panels
can do this for you.
I would expect an electric installation
may well be lighter as well, allowing possibly for a better ballast to displacement ratio.
My expectation is because of rising fossil fuel
costs and local legislation, that electrically propelled boats will soon start appearing from the production companies.
Considering that most boats spend most of their time in marinas
, then purchasing
electric power has got to be much cheaper than buying
At this stage diesel propulsion
may seem initially to be preferable cost wise, but any one who tells you diesel engines are "install and forget" is telling very big fibs.
Having a large battery
bank also means you can run not just refrigeration
but also cooking
, winches and possibly A/C off them as well.
On a larger vessel such as yours, you may also consider an "off the shelf" dedicated gen set for emergencies.
I am sure you are aware of the special electrical corrosion
issues involved with aluminium hulls.
Being in Europe
, I am sure there are many progressive electric drive companies.
My final observation is that it is rare to see anyone building their own boats in todays market place. There are just so many excellent boats on the second hand market going for a song - and a few years work