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Author: Darrel Jensen ([email protected]) contact the author Subject: More rules talk, this time life lines Info: (18555 views) Posted: Thursday 12-20-07 04:23:10 PM |
Darrel
:: The notion of having no deflection on the forward
:: section of lifelines, is what we do on Xena. It is
:: essentially two pieces of lifeline attached with a
:: fitting, such that the slack in the middle section of
:: lifeline is independent of the slack in the foward
:: section. I installed the fitting for two reasons:
:: safety-- it eliminates the chafe/bending of the
:: life-line and this is where they almost always fail, and
:: I didn't want any slack on the bow; but wanted it all
:: where the hikers are.
::
:: I personally have no problem with the higher stanchions
:: being proposed, as long as the current arrangement is
:: also legal, and this is what I suspect the west coast
:: boats will stick with... except for those that are
:: contemplating long distance ocean races.
::
:: Mark Lowry
::
:: :: Since it is the holidays and the holidays are about
:: :: giving I thought I’d launch another thread on the class
:: :: website and give something to think about over the
:: :: holidays. I’d like to start a discussion on lifelines
:: :: and a proposal to update and improve the rule.
:: ::
:: :: To save the trouble here is the rule we all know and
:: :: love:
::
:: :: A. Life lines are required. They must meet the following
:: :: criteria:
::
:: :: 1. Minimum height 12".
::
:: :: 2. Not be bent outboard of a projection of the factory
:: :: installed socket.
::
:: :: 3. Combined maximum deflection between the pulpit and
:: :: the forward stanchion and between the forward stanchion
:: :: and the aft stanchion when supporting a 5 pound weight
:: :: at the middle of the aft span shall be 5 inches total.
::
:: :: They shall be continuous from the aft stanchion to the
:: :: bow pulpit on each side. Minimum size is 1/8" stainless.
:: ::
:: :: In short what I’d like to see is a higher minimum
:: :: stanchion height, more allowable deflection using bungee
:: :: to tighten the life lines and allow spectra and / or
:: :: high density foam padding as material. The main reason I
:: :: pose this issue is improving safety and comfort while
:: :: maintaining performance. I think moving to this proposed
:: :: setup (similar to a Melges 24) can accomplish this.
:: ::
:: :: I’ll start with safety, I’ll start by saying the 5 pound
:: :: weight thing is a joke. 5 pounds of pressure on a
:: :: lifeline indicates nothing, especially when the life
:: :: line does not stretch. I look at the rule now and what I
:: :: see is a height of 12” that hangs down another 5” giving
:: :: an effective range of 12”-7” of protection. Evolution
:: :: came with this setup and it scared the crap out of me
:: :: and we don’t get nearly the wind you folks get out west.
:: :: So what we really have is hiking lines, not life lines
:: :: anyway. I say that because what I’m proposing is
:: :: technically hiking lines, which is what we really have
:: :: already like it or not.
:: ::
:: :: Below a comparison of Express vs Melges height. You can
:: :: see the higher and safer setup on the Melges.
:: ::
:: :: http://express27.org/photos/1923.jpg
:: ::
:: :: http://www.melges24.com/photogalleries/images/G17_5878_large.jpg...
:: ::
:: ::
:: :: The Melges setup does deflect more in total, but is
:: :: higher when in rest and still goes just as low as what
:: :: the current Express rule allows. These setups have the
:: :: same effective performance.
:: ::
:: :: http://express27.org/photos/1987.jpg
:: ::
:: :: http://www.melges24.com/photogalleries/images/G17_5310_large.jpg...
:: ::
:: :: The number one reason to oppose this would be cost. One
:: :: way to address that is to allow the current setup under
:: :: a grandfather clause. Also making a deflectable spectra
:: :: and or foam padding life line set up is not that
:: :: expensive. You can get higher stanchions and switch to a
:: :: bungee / spectra life line with existing tube pads for
:: :: around 180 bucks. If you wanted to get more fancy you
:: :: could get the same pads which the Melges 24 uses for 300
:: :: bucks. They do fit, I’ve done a side by side comparison
:: :: with a Melges buddy when we were waiting for wind during
:: :: a prestart. It is not like we are talking arms race
:: :: here. I’d say that the overall performance improvement
:: :: is negligible. But safety and crew comfort would
:: :: improve.
:: ::
:: :: To quickly address safety on the bow there would be a
:: :: separate piece of life line for that section which has
:: :: zero deflection. Also in the back for us Detroiters who
:: :: don’t like sliding out of the back of the bus. The
:: :: bungee tightened / deflectable portion would be in the
:: :: middle, where the crew hikes.
:: ::
:: :: Another quick issue is worn out spectra becoming a
:: :: safety issue. That’s solved by regular inspections and
:: :: I’m sure all you salt water folks inspect your wire
:: :: lifelines regularly.
:: ::
:: :: So there it is, to use the Sailing Anarchy vernacular
:: :: flame away.
:: :: -Dan
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