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Topic: OT Marine diesel, was coffee storage question (8 msgs / 172 lines)
1) From: Brian Kamnetz
Bob,
It is interesting to hear that motor yachts use the diesels you
mention (Deere, Cummins etc.) since, if my impression is correct,
those are relatively heavy engines compared to automotive diesels used
by Mercedes, VW, etc. I suppose that the lighter diesels are
preferable because they are lighter, whereas Deere, Cummins etc. have
superior reliability, always a good thing at sea. On the other hand, I
suppose that when you are spreading the weight across 60 feet of
watercraft,  the freeboard lost to the extra weight is not all that
significant.
Brian
On Sat, Nov 29, 2008 at 3:31 PM, Bob Brashear  wrote:
<Snip>
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2) From: Bob Hazen
Seems that there are two schools of thought:  old and new.  The old school 
engines; Perkins, Lehman et. al. were/are normally aspirated.  They aren't 
light weight, but run forever with proper maintenance.  The new school 
engines are turbocharged, use electronic engine controls, run at higher rpms 
and weigh less.  Reliability and life are probably less than the old school, 
but still better than gas engines.
And I guess, there's the really old school - direct drive, reversing Atlases 
for example.  FWIW, I saw an old guy go through the Ballard locks few years 
ago with an old woody and a direct drive diesel.  He was a master.  He'd 
start the engine in forward (compressed air start), it'd bark and move the 
boat forward a bit.  He'd kill the engine and drift before starting it in 
reverse and backing a bit.  He'd alternate this routine as needed.  He was 
able to nuzzle that boat in right where he wanted it.  It was a thrill to 
watch.
Bob

3) From: Frank Parth
When you're in the middle of the South Pacific, or fighting the Doldrums in the mid Atlantic, reliability is a major 
concern of the captain. Most deep water sailors I know would sacrifice some weight to gain a more reliable engine(or 
theiron jenny as yachtsmen refer to their engines). And as you say, it depends on the size of the boat. My H28 came 
with an Atomic 4 gasoline engine, but is getting a small diesel in replacement.
Frank
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4) From: Ira
At 12:44 PM 11/29/2008, you wrote:
<Snip>
It's a lot more important that a yacht make it back to port than a 
car make it back home. One is a inconvenience, the other might be a 
sentence to death. Same reason small airplane engines tend to be 
heavy and underpowered.
Ira
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5) From: Tom McConnel
Small aircraft recip engines are relatively light for their displacement and
are actually made to run at much higher constant horsepower than automobile
engines. 
Small aircraft turbine engines are very light and very powerful. Eg the
Allison C30 weighs about 170 pounds and is capable of producing 650
horsepower.

6) From: Bob Hazen
It's all about maintenance too.  If small planes were maintained in the 
manner of the typical car, they'd be falling out of the sky on a regular 
basis.
Bob

7) From: Frank Parth
Yes, but try and get parts in the South Pacific!
Frank
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8) From: Bob Brashear
On Sat, 2008-11-29 at 15:44 -0500, Brian Kamnetz wrote:
<Snip>
Brian,
Those were just off the top of my head. Plenty of marine engine makers
out there. Interesting to see how many on the list are familiar with
these things. And to drag this kinda back on topic ...
We just figured out that I'll need two espresso machines and grinders.
One for the pilot house and one for the salon/kitchen. I'm not lugging
brewer and grinder all over the boat. Hmmm. Maybe a set on the flying
bridge too ...
Bob
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