Express 27 National Championship at San Francisco Yacht ClubOctober 5 - 7
Result
PosBoatTotalRace 1Race 2Race 3Race 4Race 5Race 6Race 7
1Magic Bus283(3)5(8)6(14)2(16)1(17)1(18)10 (28)
2Motorcycle Irene292(2)2(4)14(18)1(19)7(26)2(28)1 (29)
3Get Happy!!344(4)3(7)11(18)5(23)3(26)6(32)2 (34)
4Thumper3711(11)1(12)2(14)9(23)4(27)5(32)5 (37)
5Fired Up!421(1)4(5)8(13)8(21)5(26)10(36)6 (42)
6Current Affair5112(12)6(18)10(28)3(31)13(44)4(48)3 (51)
7Tequila Mockingbird625(5)7(12)17(29)4(33)2(35)14(49)13 (62)
8Andale627(7)10(17)3(20)12(32)11(43)7(50)12 (62)
9Abigail Morgan6413(13)13(26)1(27)6(33)9(42)11(53)11 (64)
10Wile E Coyote686(6)9(15)7(22)OCS(40)RET(58)3(61)7 (68)
11Salty Hotel719(9)8(17)4(21)11(32)10(42)12(54)17 (71)
12X-Wing7610(10)14(24)13(37)14(51)8(59)9(68)8 (76)
13Bombora8316(16)15(31)15(46)10(56)15(71)8(79)4 (83)
14Peaches8714(14)12(26)16(42)7(49)6(55)17(72)15 (87)
15Take Five908(8)11(19)9(28)16(44)16(60)16(76)14 (90)
16Artemis9417(17)16(33)5(38)13(51)14(65)13(78)16 (94)
17Hang 209515(15)17(32)12(44)15(59)12(71)15(86)9 (95)
export csv

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Author: Maryann
Subject: Stability when climbing the mast
Info: (12838 views) Posted: Monday 7-15-13 08:11:49 PM
The rigger I use prefers the boat to be in the water tied off at the dock. We use the hoistway at EYC which allows tying off to a dock on both sides.

:: I'm 195#, and haven't ever had a problem (and have spent
:: way too much time at the masthead). As long as the
:: people on deck are paying some sort of attention, I
:: wouldn't worry too much.

:: Cheers,

:: Patrick
::
:: :: We usually send somebody up using the club's gin pole or
:: :: somebody who is light with an extra halyard.
:: ::
:: :: :: Thanks for the reply Bryan.
:: :: ::
:: :: :: So you are saying that even with the boat on the
:: :: :: trailer, the rigger ran the halyards off to the sides
:: :: :: and tied them off to things? That seems extreme...I
:: :: :: would not have given it a second thought on the trailer,
:: :: :: but we can presume he knows what can happen.
:: :: ::
:: :: :: I've been up the mast on many many boats and this was
:: :: :: the first time I've felt one start to go over - could
:: :: :: have been luck to date though.
:: :: ::
:: :: :: Would love to hear any other experiences.
:: :: ::
:: :: :: :: not sure if i did it right but i recently calculated
:: :: :: :: that my 180 lbs at the top of the mast would flip the
:: :: :: :: boat at the dock if the angle of heal exceeded... what
:: :: :: :: was it... 15 degrees?
:: :: :: ::
:: :: :: :: a rigger that i had re-run a halyard recently requested
:: :: :: :: the boat be on the trailer and even on dry land he took
:: :: :: :: every available halyard and used them to brace the mast.
:: :: :: :: he mentioned that he does the same if the boat is in the
:: :: :: :: water too but its more complicated.
:: :: :: ::
:: :: :: :: :: Just some quick math would say your 160 pounds is
:: :: :: :: :: offsetting the keels lever arm somewhere around 20 feet
:: :: :: :: :: off the water. Above that you're relying on the form
:: :: :: :: :: stability of the hull, so 'yes', all the way up the rig
:: :: :: :: :: should get real squirrelly! That presumes the center of
:: :: :: :: :: the 1100 pound ballast is about 3 feet under water (3300
:: :: :: :: :: ft lb of potential leverage). I know it's a LOT more
:: :: :: :: :: complex than a seesaw, but at the top of the rig your
:: :: :: :: :: lever for that 160 pounds is probably around 28 feet
:: :: :: :: :: above the water (over 4400 pounds).
:: :: :: :: ::
:: :: :: :: :: :: I went up the Express 27 mast not long ago and had a
:: :: :: :: :: :: somewhat scary experience.
:: :: :: :: :: ::
:: :: :: :: :: :: I weigh 160, and at the time there was a 200 lbs guy on
:: :: :: :: :: :: deck with the boat tied to the dock. I was at the top of
:: :: :: :: :: :: the mast doing some work and the guy on deck stepped to
:: :: :: :: :: :: the rail to do something. The boat started heeling
:: :: :: :: :: :: pretty extremely and truly felt like it was going to to
:: :: :: :: :: :: roll all the way over until guy on deck jumped to the
:: :: :: :: :: :: other rail to stabilize the boat.
:: :: :: :: :: ::
:: :: :: :: :: :: Would the boat really roll over like it felt it might?
:: :: :: :: :: :: Any experience with sending people up the mast on this
:: :: :: :: :: :: boat and how much weight is too much?
:: :: :: :: :: ::
:: :: :: :: :: :: We plan to go up the mast fairly frequently with the new
:: :: :: :: :: :: offshore rules for mounting and removing the masthead
:: :: :: :: :: :: VHF when doing offshore races, not to mention if we ever
:: :: :: :: :: :: had a problem and needed to ascend the mast while on the
:: :: :: :: :: :: water.
:: :: :: :: :: ::
:: :: :: :: :: :: I'm wondering what is safe?
:: :: :: :: :: :: 

:: :: :: :: :: :: -dan
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