On Mon, 23 Feb 2004 13:04:31 -0500, "Jeff Morris"
wrote:

You're using an aviation turbo diesel to prove your point? That's rich!

If you simply go to the Yanmar site, or the Mastry site you'll find the curves
for typical marine diesels. Contrary to your claim, the best efficiency is
usually down around 2400 RPM, not at full throttle where the engine's advertised
HP rating is taken.

The Yanmar 4JH3-HTE your article talks about is rated at 175 grams/hp-hour at
full power, which is 18 HP per gallon, but the efficiency goes up to 153 g/hp-h
at reduced rpm, which is 21 HP per gallon.

Sorry jaxie, the mistake you're making is thinking that marine engines are most
efficient at full throttle, or that they are normally run that way.

I think your last point is the real issue. How much hp is required to
push a given displacement sailboat to hullspeed in a given set of
conditions? Generally it has been around 2500 rpm in my experience.
Just as I don't generally drive my auto in such a way as to require
all 225 hp, I don't motor in my sailboat in such a way as to require
all 27 hp. I have never calculated my fuel consumption, but 1 gallon
per hour would be WAY high, in my experience. Maybe if my boat was a
barge with a shag carpet on the bottom and an Atomic 4, maybe...



"JAXAshby" wrote in message
...
okay, old fart, here is a fuel rate curve for another engine. It shows, btw,
the best hp/gallon at near max hp (to be expected, because in a diesel max
torque [best efficiency] rpm is near max hp rpm)

http://www.deltahawkengines.com/perfor02.htm


btw old fart, are *really* trying to say large diesel engines make horse****
use of diesel fuel to generate each hp output as compared to small diesel
engines? That IS what you said. Did you mean it?

Jax is a LIAR, Jax is a STUPID LIAR,
Jax is so STUPID that he gives fuel usage of a 125 hp engine to try and
prove the fuel usage of a 20 hp Diesel. When was the last time anyone
has seen a Mono Aux traveling a 33 mph?

Jax is a LIAR!! Jax is a TROLLING LIAR!!
Jax is such a STUPID LIAR that he proves himself to be a STUPID LIAR by
just letting him talk (or Post) He and his mentor do not know the
meaning of truth

Jax doesn't even know were he lives; He is a LIAR!!

Jax doesn't know what kind of boat he owns; He is a LIAR

In his own Murky Mensa Mind (LOL) he still doesn't know the location of
the Gulf Stream and tries to Lie his way out of his IGNORANCE.

Trying to reason with a confirmed LIAR is a useless exercise. For this
reason I terminate any farther discussions with;
THE LIAR!!!

Ole Thom