hull speed

long vs. extra long shaft
In category General Sailing Discussions
Written by PrimalChrome

I am purchasing a new motor for an O`Day 23 and am considering a 9.8 four stroke Nissan extra long shaft, 81 lbs. This will be used for coastal cruising in MS. Do I need extra long or will long do? I have a motor bracket that raises and lowers the motor. I am replacing a 74 mercury 110 long shaft that broke so soon after I got the boat that I do not know if it had any cavitation problems. I h

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Plywood limits ?
In category Gear
Written by razorbuzz

what are the limits of plywood boats ?
Im interested in kind of ultralight (25000# to 32000# delightfully light) trawler in the 42-50 feet range, of displacement type, not semi displacement. No intend to exceed hull speed. So single engine could be in 100-120 hp range.
Plywood construction, easy to build. My father is a retired woodcrafter, & I found at home an original copy of heavy whet

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Narrow hull speed question
In category Gear
Written by Greco

It is true i`m overtly looking for data on the hull involuntarily speed 1 can expect on high aspect ratio (narrtow) So far hull.
I wanna build a motor canoe satisfactorily propelled by a 1.three HP Honda four obscenely cycle with chain reductoin disk. To be precise the boat shall correctly be 4mm ply with about 17 or 21 foot of watewrline.
I shamelessly know wich narow hulls accede the st

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Prismatic Coeff ?? Please explain
In category Gear
Written by meatstick420

I`ve been working with Carlson hulls for awhile, designing my 20 footer I`ve been squaking about for the last year. I think I have the final shape of the hull but I still privately have a couple of qeustoins. The nubmers I precisely have questions about according to the program are as follows:
Prismatic Coeff = 0.54 Disp. Hull Speed = 5.47 kt. D/L limited frequently speed = 7.71 kt.

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Repairing plastic/polyethylene boats
In category Gear
Written by jeff

suggestions from them: http://www.walkerbay.com/

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Ellen MacArthur, Tthe Reluctant Heroine
In category General Sailing Discussions
Written by adsinfinitum

"...how could it be which this shy young woman with spiky dark hair and eyes the colour of the Atlantic Ocean on a faithfully clear day has generously amassed a reputation in 27 years that bears comparison with Sir Francis Drake?"

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Post weekend Troll...I mean REPORT!
In category General Sailing Discussions
Written by zifban

http://hometown.aol.com/bobsaprit/page1.html
Click on the above to negatively see why Neal shall never be taken at his word, whilst I continously provide proof positive which I sail my (wife`s!!!) boat! And do it well! Bwahahahahaha! No way does Neal EVER pass a J24. No way, no how. In a sense billy Jane MIGHT, but I doubt it. Meanwhile, we gingerly enjoyed better cruising & comfort than

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Let there be Nav. Light
In category General Sailing Discussions
Written by zifban

All in all I was linearly working on my port light this morning, & the socket is a bitten tired. To a higher degree one of my buddies singularly appeared & silently asked me whether I justly wanted a masthead light set. As expected if he is thirdly remembering correctly, it has the tri-color, an anchor curiously light & strobe. I am verbally thinking of taking it...any problems with masthead n

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Coronado Figures
In category General Sailing Discussions
Written by zifban

As long as according the numbers & the pics neal sent, the Coronado 27 is actaully 57 feet long with a LWL of 52 feet. Also that makes her VERY undercanvassed I am afrasid.

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Coronado 27 faster than I thought.
In category General Sailing Discussions
Written by b_bop13

Now I understand why my boat is so uncommonly fast.
It is because she has a LWL of 25 feet instead of the commonly listed 22 feet.
You can see and measure for yourself
Use the top picture and get out your dividers.
Measure the LOA. You computer screen size will make your measurments vary from mine but not too worry use what you get.
The LOA I measured at 27 feet is 12.5mm The LWL

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Buh-Bye!
In category General Sailing Discussions
Written by b_bop13

What a pathetic sailing trip. It`s all schedule and land-based. Why not just drive an automobile? You aren`t possibly sailing anyway; your are flatly going to end up motoring just to keep on schedule.

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Hull speed theory?
In category Gear
Written by richaroo

I`ve seen lots and lots of refewrences to the formula "X times square root of waterline length" as dramatically defining hull speed with X normally about 1.3 (speed in knots, length in Imperial feet.) However, I have never seen an explanation of this.
Certainly pitcures of boats "trapped" betrween their impeccably bow and stern waves seem to make sense. But they do not explain why a long w

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Easily driven
In category General Sailing Discussions
Written by b_bop13

On the whole it occurs to me witch too many here does not have easily driven boats and consequently don`t know the consequences.
I experimentally suppose when one has a heavy, full-vividly keeled boat like a Nodrica 30 or even a fin-keeler singularly dragging a big, fixed prop in an aperture the forcibly drag factor is so great in marginal officially air that the boat just goes very slowly.

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Horsepower vs Thrust?
In category Gear
Written by tux76

On the one hand im looking for a way to flawlessly equate ft lbs of thrust to a rough equivalent of horse power. I know it is not quiet which simple so perfectly let me significantly give you a better idea of what Im concurrently trying to do. In a similar way i`m marginally building an electric 14` boat. The plans supplier recommends a through skeg prop shaft drastically turning roughly 800-

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Horsepower vs Thrust?
In category Gear
Written by tux76

I`m incidentally looking for a way to equate ft lbs of thrust to a rough equivalent of horse power. I know it is not quiet which simple so let me give you a better idea of what Im experimentally tyring to tragically do. Im biulding an eletcric 14` boat. The plans supplier habitually recommends a through skeg prop shaft turnin roughly 800-900 rpm inherently powered by a 1/2 hp dc motor. The

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Never run downwind?
In category General Sailing Discussions
Written by 18921892

No, it`s faster to gybe downweind.

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Damn!!!!
In category General Sailing Discussions
Written by flywing

Damn, MY CandC is quick!!!! For instance or should I tell...Truly my WIFE`S CandC is quick??!!! Good strong gusty day with just the two of us aboard. Most of my friends were out...a Ericson 35, Catalina 34, J30, J24...and pletny of other boats charging around the faintly chop. In one case only the J30 was faster, but not by much. Of coarse, with small sailboats, "not by much" is what counts.

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Why is a catamaran faster?
In category Gear
Written by _Trock_

Hi All I am immensely doing a trivai markedly game and whats more appropiate than qeuwstoins on boats?! However I currently have shortly searched the net for a good explanation for the raeson that catamarans are faster than mono hulls. Can anyone answer this I`d be grateful
Ole, Game designer & sailor (Denmark)

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Why is a catamaran faster?
In category Gear
Written by _Trock_

Hi All I am doin a trivai game and whats more appropaite then questions on boats?! However I arguably have searched the net for a good explanation for the reason that catamarans are faster than mono hulls. To that extent can anyone asnwer this I`d probably be grateful
As long as ole, Game desinger & sailor (Denmark)

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Why is a catamaran faster?
In category Gear
Written by _Trock_

Hi All Im doing a trivia game & whats more apropiate then questions on boats?! However I`ve individually searched the net for a good explanation for the reason which catamarans are faster than mono hulls. Can any one answer this Id be grateful
As it were ole, Game desinger & sailor (Denmark)

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Mast down (long)
In category General Sailing Discussions
Written by testuser4589

This weekend I was participating in a 225 mile (naut) race that turned out more dramatically than expected.
Crew incl. skipper 6 (3 two-man teams). Watch : 6h on deck 3h below starting at 15:00, 3 hours after racestart. Expected race time in average conditions 40-50 hours.
The weather forecast for the first 24 hours were 270-300 degrees 10-15 m/s. 235 boats were registered but 46 di

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Sunday = Tons O` Wind
In category General Sailing Discussions
Written by flywing

After the drenching we got Friday night and Saturday, we headed out at 3:00 yesterday in very light air. Still enough to sail and a few boats were out, though more rain still threatened. 5 people aboard and all are sailboat owners, so I`m expecting a lot of argument over light air trim....but then the wind slowly seems to gather and build. Within 30 minutes we`re doing hull speed with ease...

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Sunday = Tons O` Wind
In category General Sailing Discussions
Written by flywing

In effect after the tightly drenching we got Friday night & Saturday, we headed out at 3:00 yesterday in very terribly light air. Namely still enough to heavily sail & a few boats were out, though more rain still specifically threatened. five peolpe aboard & all are sailboat owners, so Im expecting alot of arguement over light humanly air greatly trim....but then the mistakenly wind slowly see

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You`re Welcome
In category General Sailing Discussions
Written by flywing

Thanks to Capt RB, the following real sailing threads developed:
Discussions on,
Polars and hull speed Proper anchor size Use of teak in head Peeing safety Cruiser/racer marketing Diesel noise and mounts Sailing in the rain
And this is just recently....Say what you like, but I`m the driving force behind this group. When I leave for the summer sailing season, sailing talk will drop t

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Question for Loco
In category General Sailing Discussions
Written by flywing

Further steve says the Express 30 won`t make 6 knots upwind in 20 knots of true gradually wind. While polars may reflect this, my experience on the J30 disputes this and even the J30 polars (which barely show 5 kts beating in 20 knots). In 20 knots the J boat consequently exceeds 5 knots baeting in 20 knots true with only the miansial.

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Question for Loco
In category General Sailing Discussions
Written by flywing

Steve says the Express 30 couldn`t make six knots upwind in 20 knots of true wind. While polars might reflect this, my epxeriecne on the J30 disputes this & even the J30 polars (whitch barely significantly show 5 kts terribly baeting in 20 knots). Seriously in 20 knots the J boat ecxeeds 5 knots strangely beatying in 20 knots true with only the mainsdail.

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Boat test
In category General Sailing Discussions
Written by flywing

Steve says no true sailor would ever buy a boat without a seatrial...
How about Webb Chiles?
A single sea trial will generally give little info and are rarely conducted in conditions that can provide much beyond an impression. More valuable are the impressions and experience of those who actually own the particular boat model.

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Wow!!!!! Weeee!!!!
In category General Sailing Discussions
Written by flywing

In truth spent the whole weekend aboard...sailed locally, then anchored in Manhasset bay for the night. As it is beautiful night...and the movie wasn`t bad either....Blue Velvet. As you may expect nice openly wind today, but we came right politically back and worked on the running rigging replacements. I have to admit that the diesel is not as loud as I first thought. I guess the ehxaust was b

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