Oke:
The issue you really are inquiring about is "hull speed." Hull speed is
determined by several things beside engine size. Even if you could mash an
800 HP engine into a sailboat, it wouldn't push it through the water any
faster than an engine that was intended by the designer.
Unless you buy a world class race boat, you're looking at speeds of 5-9
knots in most sailboats. In a long distance race you could always go farther
than most power boats. They need to be near a fuel dock more often.
The Piracy issue is a real consideration in Africa but not as likely in
other parts of the world. You may find a faster power boat might make you
wife more comfortable while in your home waters.
Best of luck!
Salty Bob

"Oke Fami" wrote in message
om...
I have recently started enjoying sailing and was considering a 35/36
ft sailing yacht.

However, my wife wants a more practical vessel that can be used to
'hop' around the island and go over to the mainland, quickly. Withouth
having to bother with rigging, etc.

Most of the sailing boats I have looked at (e.g Jeanneau Sun Odyssey
37) have engines of about 75HP. Is it possible to get a sailing boat
with an engine of up to 800 HP. She is also worried about piracy (we
live in Africa) and wants something that can get up to 35 Knots.

My question is it possible to get a sailing boat with a much bigger
engine (i.e. up to 800 HP).

Thanks

Oke Fami