GL: Best diesel

[fred]

One oddity I discovered when I got my American Tug was the fuel consumption.
Turned out that the optional 370hp engine had slightly BETTER fuel mileage at
slow speeds, than the smaller standard 330hp version.

The reason was the
larger engine turned a larger propeller, and at slow speeds (7 knots) it does
as well as the small engined trawlers, yet allows me to outrun them at near
triple their speeds if I should so desire.  The organizer of the Waterford
Tugboat Roundup listed my boat as "able to make a beer run faster than any
other boat here".

Fred
Tug 44

----------------------------------------
From: jonathan olenick <jdolenickmd at yahoo.com>
Sent: Tuesday, December 04,
2007 1:20 PM
To: great loop list <great-loop at lists.samurai.com>
Subject: Re:
GL: Best diesel 

Nordic tugs are almost as efficient at 5-7 knots but can
do 10-17 knots in an emergency. Jon on Valentine, Nordic Tug 37.

-----
Original Message ----
From: "LRZeitlin at aol.com" 
To:
great-loop at lists.samurai.com
Sent: Tuesday, December 4, 2007 6:38:26 AM
Subject: Re: GL: Best diesel

In a message dated 12/4/07 12:00:23 AM, Ben
writes:

>
>  I've had two boats with thirsty twin gas engines and am
starting to look
> to a trawler as my first diesel. With the Great Loop in
mind long term, I am
> thinking a 32-38 foot boat with a single diesel in the
120-210HP range. Of
> that range, I'll likely eventually buy at the lower,
more efficient end.
>

Ben,

Before deciding on a boat and engine,
consider your cruising behavior on the
Great Loop. If you intend to take it
easy and spend 8 months to a year on the
water, you will be traveling no more
than 50 to 60 miles a day, perhaps even
less. A boat in the 32 to 38 ft.
range will have a hull speed of about 8
knots.
If you travel at less than
hull speed, say 6 or 7 knots you will easily make
your travel goals for the
day while burning very little fuel. My single
engined Willard burns less than
a gallon an hour at 6 to 6.5 knots. As you
approach
or exceed hull speed,
your fuel consumption increases sharply, generally as
the cube of the speed
increase. Increasing your speed by two knots will more
than double your fuel
consumption.

So, if you are a leasurely boater consider a full displacement
(Krogen,
Willard) or semi-displacement (GB, Albin, Monk 36) hull driven by a
single
moderately powered engine of 135 hp or less. At loop speeds you should
burn 2
gal/hr
or less for an average consumption of 5 or 6 miles/gallon. On
most of the loop
you will be near land so twin engine get home considerations
are moot. Just
make sure you have an unlimited towing  policy.

Of course
if you are a speed demon and want to do the loop in much less than
6 months,
disregard the above.

Larry Z

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