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#31
03-19-2010
 davidpm Senior Member Join Date: Oct 2007 Location: Madison Posts: 3,857 Thanks: 207 Thanked 54 Times in 46 Posts Rep Power: 8
Quote:
 Originally Posted by Bene505 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.
#32
03-20-2010
 sailbot Member Join Date: Mar 2008 Location: Prince Rupert BC Posts: 52 Thanks: 0 Thanked 0 Times in 0 Posts Rep Power: 8
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..
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#33
03-20-2010
 davidpm Senior Member Join Date: Oct 2007 Location: Madison Posts: 3,857 Thanks: 207 Thanked 54 Times in 46 Posts Rep Power: 8
Quote:
 Originally Posted by sailbot 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?
#34
03-20-2010
 sailbot Member Join Date: Mar 2008 Location: Prince Rupert BC Posts: 52 Thanks: 0 Thanked 0 Times in 0 Posts Rep Power: 8
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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#35
03-22-2010
 zz4gta I don't discuss my member Join Date: Aug 2007 Location: Chesapeake Bay Posts: 2,512 Thanks: 0 Thanked 29 Times in 29 Posts Rep Power: 8
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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#36
03-22-2010
 nickmerc Senior Member Join Date: Nov 2008 Location: O'Fallon, MO Posts: 563 Thanks: 0 Thanked 1 Time in 1 Post Rep Power: 7
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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Last edited by nickmerc; 08-18-2011 at 06:15 AM.
#37
03-26-2010
 davidpm Senior Member Join Date: Oct 2007 Location: Madison Posts: 3,857 Thanks: 207 Thanked 54 Times in 46 Posts Rep Power: 8
Quote:
 Originally Posted by zz4gta 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.
#38
03-26-2010
 sailingdog Telstar 28 Join Date: Mar 2006 Location: New England Posts: 43,290 Thanks: 0 Thanked 14 Times in 12 Posts Rep Power: 14
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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Telstar 28
New England

You know what the first rule of sailing is? ...Love. You can learn all the math in the 'verse, but you take
a boat to the sea you don't love, she'll shake you off just as sure as the turning of the worlds. Love keeps
her going when she oughta fall down, tells you she's hurting 'fore she keens. Makes her a home.

—Cpt. Mal Reynolds, Serenity (edited)

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#39
03-28-2010
 GaryHLucas Senior Member Join Date: Mar 2008 Posts: 888 Thanks: 0 Thanked 1 Time in 1 Post Rep Power: 8
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
#40
04-05-2010
 davidpm Senior Member Join Date: Oct 2007 Location: Madison Posts: 3,857 Thanks: 207 Thanked 54 Times in 46 Posts Rep Power: 8
Quote:
 Originally Posted by GaryHLucas 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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