It wasn't "proof positive," I was simply providing a number given on the Yanmar
spec sheet. At reduced RPM, the HP at the flywheel is much greater than what
is produced at the prop.

And there's a huge difference between 16 hp per gallon and 21 hp per gallon.
Improving fuel efficiency over 25% is nothing to sneeze at. I've never argued
that there isn't a relationship here - only that your number isn't quite right.

Further your fundamental claim is flawed because Donal's 28 hp engine is
probably run at reduced throttle and actually puts out about 12 hp to cruise at
80% of hull speed. (I'm just guessing because I don't know the details of his
boat or engine.) He probably uses slightly over a half gallon to go about 7
miles. Doing that, 10 Imperial Gallons is plenty to get him over to France and
back.



"JAXAshby" wrote in message
...
jeffies, you are just too stupid to deal with.
yesterday you were claiming you had proof positive that diesels put out
upwards
of thirty hp per gallon in just about any condition, and today you are
quibbling that brand spanking new engines operating under laboratory
conditions
are claimed by their manufacturers to get just over the 16 hp per gallon I
stated as the norm.

now, go quibble that 16 hp is more like 16 point something hp.

Then why do you keep providing sources that have better efficiency? The
Yanmar
you mentioned, according to the Mastry site, is over 20 hp/gal-hours. Even
your
Indian farm engines were 18 hp/gal-hours. You keep making a claim, than
providing sources that prove you wrong! You certainly seem dumber than Old
Thom's farts!


"JAXAshby" wrote in message
...
jeffies, give it up. you merely make yourself look a luddite.

modern, water-cooled, 4-cycle, brand spanking new diesel engines in
laboratory
conditions use about 1 gallon of fuel for each 16 hp produced.

Now you're using de-tuned farm engines to prove your point. But once
again,
you
screw it up! On the same page they list others that are over 18
hp/gal-hour,
and that's detuned to run at 1500 rpm, and using US gallons. Those
numbers
listed as "Specific Fuel Consumption" is in "grams per HP-hour"; you have
to
be
capable of a bit of math to properly convert to hp-hours/gallon.

"JAXAshby" wrote in message
...
old fart, here is the Lister engine under brand new engine, and
laboratory
conditions claiming about 19 hp/gallon/hour (that's Imperial gallons,
btw)

http://www.lovson.com/engineering.html