Will power cats.......
< RQ, what length is your trawler, what power plant? >
While I am 60' x 18, the gross registered tonnage is 89 and net is 65, so a
lot of volume. Freeboard amidships is 8', 10' at the bow. 7'2" headroom
throughout. 22' height of eye at upper steering station.
Two old Volvo 70B's, 200 hp @ 2100 rpm, which I run at 1400, which pushes her
at 8.2 with a clean bottom.
Soon to be faster as I have bilge keels, which are coming off in two weeks
when I haul out for a bottom job. When Don Bass designed my anti-roll tank he
told me about some research he had done with bilge keels and had concluded
there wasn't enough roll reduction to offset the drag. In my case, the keels
would have had to be so large to get anywhere near the efficiency of a tank
that the drag would reduce the boat speed to a crawl. These keels were put on
before I bought her and added the tank, by a yard in Nova Scotia without any
input by an NA or engineer.
< Maybe monohull drivers have become used to the slow rolling motion of their
boats. As cats are quicker so is the motion quicker, be it pitch or roll.
To say they get sore muscles from the motion of a cat may be a sign of an
unfit person and not a bad design and once they improve their compensating
muscles they won't notice the motion anymore as it will be reflexed out. >
It is a sign that cats have different motions and one's muscles need time to
adapt. As I am still racing Lasers at fifty-six, second at the USVI Laser
Championships, lost to the USVI Olympic hopeful (probably because he is thirty
years younger), and having no problem with nine minute miles, it isn't out of
shape. The muscle pain was like what I get the first time back skiing each
year; by the end of the week, either on the cat or skiing, it is gone. I will
try some cross-training starting next week as I am back on the R&C 46 cat for
another week on the 15th of October and will see if that helps.
Robert Phillips, Managing Director
Doyle Sailmakers BVI, Ltd
Tel: +284-494-2569
Mobile: +284-541-2206
VOIP US Tel: 423-285-8752
Skype: doylebvi
Good on you RQ for staying in shape and still racing the dinghy. However you
are comparing a tank to a passenger car with your comparisons.
Pat
----- Original Message -----
From: Robert Phillipsmailto:bob@doylecaribbean.com
To:
power-catamaran@lists.samurai.commailto:power-catamaran@lists.samurai.com
Sent: Wednesday, September 22, 2010 5:49 PM
Subject: [PCW] Will power cats.......
< RQ, what length is your trawler, what power plant? >
While I am 60' x 18, the gross registered tonnage is 89 and net is 65, so a
lot of volume. Freeboard amidships is 8', 10' at the bow. 7'2" headroom
throughout. 22' height of eye at upper steering station.
Two old Volvo 70B's, 200 hp @ 2100 rpm, which I run at 1400, which pushes
her
at 8.2 with a clean bottom.
Soon to be faster as I have bilge keels, which are coming off in two weeks
when I haul out for a bottom job. When Don Bass designed my anti-roll tank
he
told me about some research he had done with bilge keels and had concluded
there wasn't enough roll reduction to offset the drag. In my case, the
keels
would have had to be so large to get anywhere near the efficiency of a tank
that the drag would reduce the boat speed to a crawl. These keels were put
on
before I bought her and added the tank, by a yard in Nova Scotia without
any
input by an NA or engineer.
< Maybe monohull drivers have become used to the slow rolling motion of
their
boats. As cats are quicker so is the motion quicker, be it pitch or roll.
To say they get sore muscles from the motion of a cat may be a sign of an
unfit person and not a bad design and once they improve their compensating
muscles they won't notice the motion anymore as it will be reflexed out. >
It is a sign that cats have different motions and one's muscles need time
to
adapt. As I am still racing Lasers at fifty-six, second at the USVI Laser
Championships, lost to the USVI Olympic hopeful (probably because he is
thirty
years younger), and having no problem with nine minute miles, it isn't out
of
shape. The muscle pain was like what I get the first time back skiing each
year; by the end of the week, either on the cat or skiing, it is gone. I
will
try some cross-training starting next week as I am back on the R&C 46 cat
for
another week on the 15th of October and will see if that helps.
Robert Phillips, Managing Director
Doyle Sailmakers BVI, Ltd
Tel: +284-494-2569
Mobile: +284-541-2206
VOIP US Tel: 423-285-8752
Skype: doylebvi
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