The fuel flow test results shown in boating mags shows that with many boats,
Eisboch is correct. .


"Gould 0738" wrote in message
...
Properly
trimmed and on plane, the ideal cruise speed (with best fuel economy)
may be several knots or mph higher than the boats natural planing speed.

Doesn't that contradict the law of physics?

"On plane" can be a question of degree, but once the drag from the surface
has
reached its minimally attainable amount, adding additional speed,
especially
through a single speed transmission, will burn fuel *less* efficiently.

I'll go along with "the ideal cruise speed" may be several knots faster
than
the speed at which a vessel achieves plane, but I can't buy into a theory
that
states fuel economy improves with increased engine rpm (after the vessel
is on
plane, properly trimmed).