On Tue, 18 Mar 2014 13:34:30 -0400, Wayne.B
wrote:

On Tue, 18 Mar 2014 12:00:14 -0500, Boating All Out
wrote:

In article ,
says...

On Tue, 18 Mar 2014 09:49:58 -0500, Boating All Out
wrote:

I suppose at full power 2 15hp Hondas can only burn so much fuel.
The question is at what speed.

===

At full power, wide open throttle, they will burn about 3 gallons per
hour total. At 70% of WOT about half that.

That's in line with the specs I gave. The question is can one engine
push it at 8 knots. Can't answer that.

===

Possibly in ideal conditions, but even if it can, you're still only
getting about 5 mpg (8 kts / 1.5 gph). Best fuel economy and range
would be with a single small diesel, somewhere around 20 horsepower
would be about right. At 70% of WOT that would burn about 1 gph with
a speed of around 7 kts.

===

Correction on that. A 20 hp diesel at 70% of WOT should burn about
..7 gph giving you something like 10 mpg in flat water.