[PCW] Powering my cat

[bob Austin]

First I would check with the designer to see if the boat will handle this HP.
Specifics include the engine beds, the stringers and associated
re-inforcement.

Not only should you change the props, but also you may have to change out the
transmissions (depending on rating), shafts, stuffing box and bearings etc.
30% increase in Hp, and perhaps driving a boat beyond its designed speeds
would be a step not taken lightly.

Also for consideration is the cost vs return ratio.  Is the couple of knots
difference in speed (and reduced range) and increased fuel consumption worth
the costs--probably over $50,000?  The practical difference between a cruising
speed of 15 knots and 20 knots for the average boater is inconsiquencial.
Both speeds will give you 150 miles in daylight hours in most parts of the
world.  Practical considerations, probably bring the average speed down to 10
knots or less.  (How does the boat handle higher speeds in heavy seas?  Is
there increased "sneeze" or slam?.

Lots of questions and a gamble--also the resale may be hurt.

Regards,

Bob Austin