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Old 29-12-2013, 12:40   #1
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First Passage

Hello, Planning my first passage and just looking for advice on items I should check or plan for. Will be traveling on a Gulfstar 50 staysail ketch and coming from Beaufort NC to St. Augstine FL. Boat has a 10 knt hull speed. Hope to leave towards the end of January, sail non stop while staying a few miles out the entire way and only on a good weather window. I've done a lot of reading and feel prepared, seems like an easy trip but I am also taking my family so I would be curious to hear from others, any common mistakes, must haves or advice would be greatly appreciated.
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Old 29-12-2013, 12:51   #2
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Re: First Passage

I think that boat has just over a 8kt hull speed. With a familily, you might want to do 5. Perhaps plan on that.
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Old 29-12-2013, 13:20   #3
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Re: First Passage

Time your voyage based on 5-6 knots at most under power or sail, then figure in the current. Leave early and alwyas plan to arrive in daylight if possible. Good luck and have fun!
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Old 29-12-2013, 13:59   #4
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Thanks for the feedback. Sail magazine lists the hull speed at 9.3 knots. I can make 8 sailing the Neuse in light winds. I am hoping good steady ocean breezes will get me to ten at times, but I was hoping to at least average 7. I have taken the family through 3-4 foot seas and on my prior boat a cal 34, kids loved it. So no issues there.
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Old 29-12-2013, 14:16   #5
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Re: First Passage

I would always allow for more time and average down your speed. Plan on a 6.5 to 7 knot average, unless you are motoring.
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Old 29-12-2013, 14:26   #6
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Re: First Passage

The biggest issue is the weather window. Coming in to St.Augustine with wind against tide can be a very scary ride. Make sure there is good weather for going in to any inlet and as someone else said, time it for daylight.
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Old 29-12-2013, 16:23   #7
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Re: First Passage

sounds like everything I have planned for so far, I am going to scoot for a good weather window, my dates are not rigid so i'm not going to head out until teh weather ideal.

About the only challenging thing I have read about is the inlet at St Augustine, most say to avoid that inlet unless you have perfect weather.
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Old 29-12-2013, 16:32   #8
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St augustine is a tough inlet. Lots of shoaling, wind against tide problems, and very confusing marker placement. January can be a rougher than normal month. Consider jacksonville instead...
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Old 29-12-2013, 16:35   #9
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I have sailed allot from ga south. Plan on being pushed in quickly so keep that in mind if changing watchs. also the st Augustine inlet is tricky as in it moves. They do a good job of moving the first ball do not cut it short go all the way to it and then follow the lights in. Make sure you motor in. the Lions bridges is on a schedule during peak traffic the web site has the Times. they just added on to the St Augustine city docks and it has a good mooring field.
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Old 29-12-2013, 17:24   #10
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Re: First Passage

Quote:
Originally Posted by sunblock View Post
Thanks for the feedback. Sail magazine lists the hull speed at 9.3 knots.
Hull speed= 1.34 X root of LWL(length of waterline)

Therefore 1.34 X root of 39.66 (which is 6.29)
1.34 X 6.29 = 8.44 kts.

I personally find the motion of the boat easier at about 2/3 the hull speed.
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Old 29-12-2013, 22:55   #11
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Quote:
Originally Posted by Celestialsailor View Post

Hull speed= 1.34 X root of LWL(length of waterline)

Therefore 1.34 X root of 39.66 (which is 6.29)
1.34 X 6.29 = 8.44 kts.

I personally find the motion of the boat easier at about 2/3 the hull speed.
Interesting, shouldn't the beam impact hull speed as well?
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Old 29-12-2013, 23:17   #12
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First Passage

Quote:
Originally Posted by sunblock View Post
Interesting, shouldn't the beam impact hull speed as well?

Yes. 1.34 is for your typical mono. A canoe or a multihull has a higher waterline length:beam ratio and so will use a larger constant. 1.34 is fine for your case.
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Old 30-12-2013, 01:47   #13
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Quote:
Originally Posted by Jimbo485

Yes. 1.34 is for your typical mono. A canoe or a multihull has a higher waterline length:beam ratio and so will use a larger constant. 1.34 is fine for your case.
Indeed.

And displacement/lwl ratio and wetted surface also play a big role in how the boat behaves around hull speed.

A monohull with an aggressive hull form and lightish displacement/lwl can get up to 10% or so beyond theoretical hull speed if there's enough wind and power.

A boat like this gulfstar with its conservative hull form and relatively heavy build will be hard to get much above theoretical hull speed unless surfing.

An average of a knot or so below hull speed in a good sailing wind on a longer passage is a really good day. So 150-160 miles would be a really good day on this boat, and a day of much more than that would be pretty rare even in perfect wind. If the wind is not perfect, then less.
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Old 30-12-2013, 03:08   #14
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Re: First Passage

^^^^

And yet our 36 footer once did 159.5 nautical miles per day between Vanuatu and Australia, [I]average speed[I] so, as me mum used to say," circumstances alter cases." That boat had a 29 foot waterline, and was heavy by the racing standards of the time. So she had a theoretical hull speed of 7 knots, and that average was 6.65, which is fairly close to the hull speed. It will all depend on your boat, and how hard you decide to drive her. FYI, I used 1.3 for my calculation.

With that boat, we counted on an average daily run of 140 n. mi. And over the years, that was quite reliable. Which is why I was so pleased with the 159.5, and oh, how I wished it had been the magical 160!
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Old 30-12-2013, 03:47   #15
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Re: First Passage

'Hull speed' ?? ... exceeded that a few times..... never ever did a passage at 'hull speed' though...

Plan your trip on 5 knots and be pleasantly surprised if you arrive early....
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