I have known Steve and Linda Dashew for almost 40 years and have been aboard
many of their boats. I have no doubt that the figures which they give are
true. The numbers they give are real life usage, not sea trials or
theoretical. I do agree that most "motor boat tests" are done with very light
boats, clean bottoms and good conditions. Peter infers that a 6 year old
editorial in Lat 38 refutes their figures. I don't agree. Steve related his
own performance figures in Beowulf, and those were not disputed by the editor.
What was refuted was that a Swan 65 could average 10 knots crossing the
Atlantic. I have been on boats capable of the 10 knot average--but racing
sail boats are built to rules--not necessarilly to be most effecient or even
the fastest.
If you go back and read the various postings on the Dashew Set sail web site
about the Wind Horse's fuel consumption, you will see that the 1.7 miles a
gallon is typical of real life cruisng that they do. In the first 3 months of
cruising this boat they had averaged 1.83 miles a gallon, passagemaking,
partly up wind, in the South Pacific averaging over 11 knots.
From the article on the Alaska trip by Steve Dashew:
"All of which has led to a figure of about 1.76 nautical miles per gallon on
average, for a range of 6300 miles at 11.3 knots (1900 RPM). This is an
improvement of around 10% from what we tested during sea trials, indicating
the new props are taking us in the right direction. It is also better than
what we saw on our passage from New Zealand to Samoa. However, it is hard to
compare the figures from that period, as they include a lot of miles with the
wind and waves behind us, a few with wind and sea on the nose, and more air
conditioning and stabilizer loads "
I note that people get excited about 2 to 3 miles a gallon in a "trawler".
Many sailboats/motorsailors average 5 to 6 miles a gallon on regular basis.
Many of todays "Trawlers" are beamy, to cram as much into a shorter length.
The Dashew's experiences, the Idlewild's figures and my own with long narrow
sailboats (6 miles a gallon @ 6 knots over many thousands of miles) all
confirm that the narrow hull gets much better fuel "mileage" than the average
"Trawler".
Perhaps in the days of increasing fuel prices, we will see more narrow boats,
but perhaps not, because of the increasing difficulty of finding dockage and
the increasing cost of dockage.
Regards,
Bob Austin
<<Perhaps in the days of increasing fuel prices, we will see more
narrow boats, but perhaps not, because of the increasing
difficulty of finding dockage and the increasing cost of
dockage.>>
Perhaps there is a market for narrow boats for those who own
their own docks. Dockage expense has never been a concern of
mine, since at first I cruised full time and anchored out, rarely
setting foot on a marina dock. Two years ago, We bought a home
on the Okeechobee Waterway canal with 98' of dockage, and now
cruise half the year, using marina docks only about one day in 3
months.
At 46' long and 15' beam, Pooh isn't particularly narrow, but his
sailboat shape is sliprier than most trawler hulls at below hull
speed; and having only 80 diesel HP for 16 tons of boat allows
pretty good mileage. We typically burn 1.3-1.4 GPH with a cruise
speed of 7-7.5 kts. (that's statute gallons and knotical knots)
We should do better on the way home now, since it's all down hill
from here.
Mark Richter, m/v Winnie the Pooh, Ortona, FL
presently at the free town dock in Mechanicville, NY