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Old 10-11-2007, 09:37   #136
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Joli,
Are you suggesting that multihull sailors would consider 9 knots are acceptable for cruising. That's high for a monohull, but as you know, multihulls are much faster, so a better question would be to ask if 18 knots are doable.

Pericles
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Old 10-11-2007, 10:42   #137
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Joli,
Are you suggesting that multihull sailors would consider 9 knots are acceptable for cruising. That's high for a monohull, but as you know, multihulls are much faster, so a better question would be to ask if 18 knots are doable.

Pericles
Very true. 9 knots would be disappointing.
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Old 10-11-2007, 13:10   #138
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We're fairly quick and provision based on 175 miles a day (~7 knots) for our jumps. Not sure what Fastcat would recomend for a daily run when making a jump but I would guess over 200 miles. What daily runs do you provision for?
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Old 10-11-2007, 14:34   #139
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You're likely to get a lot more variability in passage times with a cat. There is a much bigger difference between how fast they can motor, and how fast they can sail. So you would provision based on motoring speeds, but if conditions were favourable you might arrive having needed only half of it.
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Old 12-11-2007, 23:04   #140
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Old 13-11-2007, 01:07   #141
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Hallo Joli when I took the first prototype of the 435 from Durban to Cape Town we broke the record in 3 days and 4 hours for 985 cruised miles.
When making the crossing from Cape Town to Miami we averaged 9.95 knots over the whole trip and that prototype was loaded to the maximum weight of 13255 kilo,s
I think on avarage we do better than 11 knots on long cruises. Even with 6 knots of wind we reach 4 to 5 knots in speed , with 10 knots 90 degrees we do 8 knots in speed and each newer Fastcat is a bit faster, on the hull number 5 the propulsion and many hull thru and outlets are taken out of the water besides the lower weight that now is close to 5000 kilo empty. we are also changing the bow to make the intake a bit sharper to decrease spray at high speed and decrease the resistance a bit.
It is my guess that we will hit 30 knots with this cat if we really work on it and keep her light. we are decreasing sail area with 10 squire meters by lowering the mast , this will also help in less momentum making her even safer.We already have ballast tanks on board , each sweet water tank is 350 liters and the water can be transferred from starboard to port or the other way around.This takes 12 minutes to do and it helps on a long voyage in both speed and stability
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Old 13-11-2007, 04:17   #142
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Averaging 260 miles in a day in a 43 foot boat is tough to do. That is very quick.

When you shift water ballast are you moving side to side and fore and aft? I would think aft would be good for pulling the bow up when needed?

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Hallo Joli when I took the first prototype of the 435 from Durban to Cape Town we broke the record in 3 days and 4 hours for 985 cruised miles.
When making the crossing from Cape Town to Miami we averaged 9.95 knots over the whole trip and that prototype was loaded to the maximum weight of 13255 kilo,s
I think on avarage we do better than 11 knots on long cruises. Even with 6 knots of wind we reach 4 to 5 knots in speed , with 10 knots 90 degrees we do 8 knots in speed and each newer Fastcat is a bit faster, on the hull number 5 the propulsion and many hull thru and outlets are taken out of the water besides the lower weight that now is close to 5000 kilo empty. we are also changing the bow to make the intake a bit sharper to decrease spray at high speed and decrease the resistance a bit.
It is my guess that we will hit 30 knots with this cat if we really work on it and keep her light. we are decreasing sail area with 10 squire meters by lowering the mast , this will also help in less momentum making her even safer.We already have ballast tanks on board , each sweet water tank is 350 liters and the water can be transferred from starboard to port or the other way around.This takes 12 minutes to do and it helps on a long voyage in both speed and stability
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Old 13-11-2007, 14:18   #143
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Both Our water tanks are slight aft of the center of gravity so when filled completely we take the bown out of the water while when empty she sits straight on the water line, I normaly sail with 150 to 250 liters of water in both tanks but when the wind is coming from behind we tend to fill them both to a higher level while if we get the wind from 120 to 150 150 degrees we fil the tank on the windward side to the top , we use a watermaker with a 20 GPH capacity so that is done fast and the transfer pumps do 6 gp minute so thta works fine , 260 a day is not hard work , not on this boat even with a bit of wind lets say 12 knots we move at 11 unless the wind is coming from behind 180 degrees but then we raise both a 1500 squire ft genny plus a 1200 ft genny so we reach 9 knots
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Old 01-04-2008, 07:48   #144
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Joli - you pissed me off so I drug out some race results. I own the corrected time course record for the "Down the Bay" multihull regatta set in 1988. Elapsed time over the approx. 150 statute mile course was 11 hours 21.6 minutes. That's averaging over 13 mph which is over 15 knts.

Were you out of diapers then?

Bring on yer mono "that we all own" that can do that.

Dave
I'll bet you have won a lot of races on paper the way you convert miles to knots. The last time I converted 13 mph it was only 11.296691140899682 knots. Not over 15 knots. Sorry for the post if someone else already mentioned it.
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Old 01-04-2008, 11:34   #145
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He used the inverse which is an easy mistake to do. I think most everyone around here knows 1 knot equals 1.15 MPH or about 0.51 meters/second
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Old 01-04-2008, 11:42   #146
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The last time I converted 13 mph it was only 11.296691140899682 knots. Not over 15 knots. Sorry for the post if someone else already mentioned it.
Yep, I stand corrected. My oldstimers disease. Still pretty quick, huh?

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Old 01-04-2008, 11:46   #147
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Of course you are right David, and I'm not sure precisley what 'Idrhawke''s idea was in rudely pointing out a simple error more than 4 months after the fact. I suspect we'd all better check out our old postings for mathematical/typographical errors lest we fall prey to more of the same.

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Old 01-04-2008, 11:54   #148
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MAN UP? I wouldn't think racing around some bouys was MANNING UP. That's more like what kind of father you are, citizen to your community, I think you get the idea.
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Old 01-04-2008, 13:47   #149
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I guess the phrase "Let sleeping dogs lie" would be a bit like closing the barn door after the occupants have departed. ::sigh:: Lets DO try to keep it civil please.
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Old 01-04-2008, 14:37   #150
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Woof, woof.....

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I guess the phrase "Let sleeping dogs lie" would be a bit like closing the barn door after the occupants have departed. ::sigh:: Lets DO try to keep it civil please.
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