On Tue, 23 Sep 2008 13:27:29 +0000, Larry wrote:

"Roger Long" wrote in
:

I will
have a couple more weeks of boating though, listening to 2400 HP of
MTU diesels driving tons of water through the twin Hamilton waterjets
at speeds over 20 knots. It's always a thrill watching a boat I
designed come to life and this one will probably be my magnum opus.


Thank goodness the taxpayers are paying at the fuel dock...(c;

That's one of those boats where when you shove the throttles up it sounds
like someone flushing a toilet in the daytank....(c;

Knowing how inefficient the jets are, how many GPH is she guzzling at 20
knots?

It's easy enough to do a ball park estimate. Assume something like
2/3rds power at cruising speed, and 1 gph for every 20 hp. That works
out to about 80 or 90 gph, about the same as a big sportfish or
motoryacht comparably powered. That seems like a lot at first glance
but I doubt they will be doing much long range cruising with it.