Hah!
OK, I might have miscalculated on that...but let's present the situation
where an unreefed main is
hoisted in 45 degree air (colder is denser) on a day blowing 18-20.
You engineers can calculate the load, I cant, on 150 sq feet of
material...a lot of that load is going to
be offset by the boltrope and the mast, the boom, the mainsheet, vang
and cunningham, right?
But a buttload is going to be yanking on that halyard...maybe not 900
pounds (900 is 30%, not 1000...which is 33.333333333333 percent)
If you've ever tried to get another inch of halyard tension on a fully
loaded main in 20 kn you know that that puppy is LOADED....you'll
need a winch and you'll need to luff up....so I dont think 600-900 way
off base, do you? Probably
will never know w/o attaching a load cell to the halyard and mainsail head.
But OK, I'll grant you 2% times 600 inches....still 7 inches of bungy
cord effect.
ugh.
tf
line of march
Ralph E. Ahseln wrote:
TF,
Not to be argumentative or a Nasty A**..
But do you really put a Main Halyard under 1000 pounds of load ?
(StaSet specs say Over 3000 lbs tensile)
How do you do that ?
I doubt if I can get more than half that.
I'd really like to know..
So say....IF...at 1.5 % under 15% percent tensile.. wouldn't StaSet
have a lot less stretch ?
Is good ?
Ralph
" Oblio"
Gresham OR
----- Original Message ----- From: "tim ford" <[EMAIL PROTECTED]>
To: <[email protected]>
Sent: Tuesday, June 24, 2008 8:53 AM
Subject: Re: catalina27-talk: Main halyard replacement
While I do agree Sta-Set is perfectly adequate, I wouldn't recommend
it for approx. 30+ feet of
halyard hoist, even if I were just cruising the boat. The percent of
elongation with Sta Set is
(I think) about 3.6 percent under a 30% tensile strength load....that
translates into 13 - 14 inches of
stretch, even more when the main is reefed. So, every time the sail
loads up in a puff the draft goes
aft, the sail becomes more powerful and you have less control of the
boat when you need it most.
Drop your halyard 12 inches one day when it's blowing 20+ and see
what it does to your main's shape
and your helm's feel...you might feel differently about Sta-Set after
that.
I just sayin' is all...
tf
line fascist
