Climb the mast on small boat - Page 4 - SailNet Community
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post #31 of 40 Old 03-19-2010 Thread Starter
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David,

You could also do a rough a "no heel" approach and you see if the center of gravity can counteract your weight at the top with no heeling (benefits from hull shape) needed for righting moment.

If the center of gravity is 1 foot below the center of buoyancy, you can climb up to a height of H before you'll get any heeling:
5,400 lbs x 1 ft = 200 lbs x H ft

H = 27 feet

Brad
"If the center of gravity is 1 foot below the center of buoyancy"
Are you saying that there is no way this number is less than 1?

The mast height is 35' so with your calc I would tip the boat over.

With your calc even a Catalina 27 would tip over with me at the top of the mast. That I can assure you is not true.

Last edited by davidpm; 03-19-2010 at 09:46 PM.
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post #32 of 40 Old 03-20-2010
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Hi there, I hope I'm not over simplifing here, but I took the Darwin approach.. No math, no measurements, just started climbing. I got to the speaders, still seemed stable, I made it sway but still felp good.
got almost to top didn't feel so good. I made it sway, and felt VERY NOT GOOD, so I came down.
I didnt need a formula, just a new pair of underwear

My point, let your fear be your guide. As far as my burnt out mast light.
I guess it will stay that way..

A King needs a Crown
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post #33 of 40 Old 03-20-2010 Thread Starter
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Hi there, I hope I'm not over simplifing here, but I took the Darwin approach.. No math, no measurements, just started climbing. I got to the speaders, still seemed stable, I made it sway but still felp good.
got almost to top didn't feel so good. I made it sway, and felt VERY NOT GOOD, so I came down.
I didnt need a formula, just a new pair of underwear

My point, let your fear be your guide. As far as my burnt out mast light.
I guess it will stay that way..

Yes well I doubt it I would have even tried on a 23 footer. What does it weigh?
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post #34 of 40 Old 03-20-2010
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I dont know what she weighs, but I new she would tip. It just felt real bad
numbers are great but let common sense rule

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post #35 of 40 Old 03-22-2010
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If you're that worried about it. Snug up the dock lines, hoise a bite on a jib halyard, and tie it to either side of the dock. Like an A frame. It'll keep it from swinging around.

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post #36 of 40 Old 03-22-2010
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If it makes you feel any better I am 6'2" and weigh about 270lbs. I went up my P30's mast. I swung about with every wake from passing boats, but at no time did I feel the boat was unstable. I think it would be interesting to calculate the moment arm caused by the wind acting on the sails under different conditions.
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post #37 of 40 Old 03-26-2010 Thread Starter
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Quote:
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If you're that worried about it. Snug up the dock lines, hoise a bite on a jib halyard, and tie it to either side of the dock. Like an A frame. It'll keep it from swinging around.
Seems like a good solution, thanks.
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post #38 of 40 Old 03-26-2010
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I'd point out that I've had a friend go up the mast on my boat with the amas retracted, and had no problems. He's about 190 lbs. and my boat isn't ballasted in any way.

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post #39 of 40 Old 03-28-2010
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Back when I was younger, 150 lbs, and much stronger, I shinnied up to the top of the mast of my O'day 20 (24' mast) to retrieve the main halyard. My wife to be was in the cockpit steering, as we were under power heading out into the bay! It was quite choppy with lots of power boat wakes, and the boat rolled maybe 20 degrees to each side, but it didn't tip over, and my only worry was getting wet!

Gary H. Lucas
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post #40 of 40 Old 04-05-2010 Thread Starter
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Back when I was younger, 150 lbs, and much stronger, I shinnied up to the top of the mast of my O'day 20 (24' mast) to retrieve the main halyard. My wife to be was in the cockpit steering, as we were under power heading out into the bay! It was quite choppy with lots of power boat wakes, and the boat rolled maybe 20 degrees to each side, but it didn't tip over, and my only worry was getting wet!

Gary H. Lucas
That is impressive.
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