[C38] Headstay Length?

[les]

Hi, Chuck,
	The hull of a boat or ship is non linear, and often a compound curve.
To fit a board or rib (as in sistering) the matching member has to be
cut or bent (steamed) to match the curve.  It is often too difficult to
match using a tracing technique, so a board and stick are used to
calculate points which can be bridged with a batten to arrive at the
correct "fair curve".

	The board is just a square or reasonable shape to get at the place
where the new member is to be attached.  The stick is long enough to
match the reach the curve of the ship at all points where the new member
will be placed. It is either sharpened or a nail is inserted to give a
precise point to the stick.

	The stick is placed along the board, and a line scribed where along the
stick, and a mark placed on the stick matching a mark on the board.  The
two marks on the stick and board are labled as "A" or some such, then
the stick is moved and a new line and marks made and labled "B" or some
such repeat as required.  The points touched are typically 2-4" apart
along the hull, unless the curve is really tight.

	Take the tick board and stick to a flat surface and lay them on top of
the piece to be cut.  Place the stick again along the lines with the
marks lined up, and mark the board to be cut at the point of the stick.
Repeat until all marks are made on the new piece.  Place a batten along
the marks and scribe its arc(s) on the new piece.

	Cut the new piece along the batten scribed line and away you go.

Regards,
Les H
On Wed, 2011-03-02 at 08:09 -0500, Chuck Finn wrote:
> You got me on this one Les!  What is a tick board?
> When I googled it, I found all about woodticks...
> 
> Chuck Finn
> Mighty Quinn,  #114
> Great Lakes
> 
> On 3/1/2011 5:20 PM, les wrote:
> > Hi, David,
> > 	The technical stuff is available after you log in.  In the meantime,
> > you can get the I and J from the brochures.
> > 	Go to the website:
> > 	http://www.catalina38.org/?page_id=75/
> >
> > 	About halfway down, the I and J are given as 49.8 and 15.5.
> >
> > 	You can also check out the photos of the brochures to double check.
> >
> > 	49.8^2+15.5^2=2720.29
> > 	
> > 	Taking the square root of that gives 52.15 or 52' 1 7/8" as the head
> > stay length.
> >
> > 	I measured mine at 52' 3" when we replaced the gear a few years ago, so
> > I expect that most of the boats will vary by something similar +/- an
> > inch or so.
> >
> > 	Just remember that nothing is square on a boat and no two boats are
> > really identical.  That is why knowing how to use a tick board will help
> > you build interior stuff.
> >
> > Regards,
> > Les H
> >
> > On Tue, 2011-03-01 at 13:31 -0800, david at dlrfilms.com wrote:
> >> In no particular order:
> >>
> >> This website says the "I" measurement is deck to masthead:
> >>
> >> http://www.secondwindsails.com/measurement.php
> >>
> >> I did I squared + J squared and got 2570.89, which should put the max
> >> hoist for headsail at about 50'. Even if I went up the mast I wouldn't be
> >> able to measure that because I don't have a tape that long!
> >>
> >> What's this about paying online? I'll pay, if I know who, where and how much.
> >>
> >> Also, in addition to not being able to find the (approximate) headstay
> >> length, I can't find any of those other nifty technical sheets that I used
> >> to be able to find on Catalina38.org. Are they still there? Am I going
> >> blind?
> >>
> >> And speaking of hard to navigate websites, we have a new iteration of
> >> sailingmontauk.com up. Comments, critique and links welcome!
> >>
> >> http://www.sailingmontauk.com
> >>
> >>
> >>
> >>
> >>> Tonight Ill pull my measurement forms from when we ordered new sails and
> >>> pass them along,
> >>>
> >>>
> >>>
> >
> >
> > _______________________________________________
> > Listserve mailing list
> > Listserve at catalina38.org
> > http://catalina38.org/mailman/listinfo/listserve_catalina38.org
> 
> 
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