im looking at this luger southwind 21 now but it has no headsail. i know a guy with hundreds of sails but he needs the diamentons. how do i measure for the headsail size (from where to where?)
how to measure for a headsail
- Thread starter colin2010
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Seek his assistance in what to measure, since he knows what he's selling you. Folks selling sails should be able to tell you what they need in order to sell you one. (-:
It also wouldn't hurt to look at the Luger forums at this [LINK]. (One of the same links caguy gave you in the other thread) and ask for assistance there. I'd be willing to bet that they could tell you exactly what you have on your hands based on the hull number or year/model.
It also wouldn't hurt to look at the Luger forums at this [LINK]. (One of the same links caguy gave you in the other thread) and ask for assistance there. I'd be willing to bet that they could tell you exactly what you have on your hands based on the hull number or year/model.
The primary dimension is the max hoist or luff length,
measured from the halyard raised to the top and the
tack point on the stem fittting.
The next issue is where the sail will sheet to.
There is a litttle bit of an art to determine where
the clew needs to end up to sheet to an existing lead.
If there are long tracks for the fairleads, the problem
gets easier, but where the sail sheets will vary dramatically
with varying foot and leech lengths.
If you measure from the halyard at the top down,
and from the tack point aft, to the back of the track,
you will have the max possible leech and foot measurements.
But you ideally want the clew up off the deck somewhat,
so as the leech gets shorter the foot will have to get
shorter as well.
Measure the max hoist. Measure from max hoist to
the forward and aft ends of the lead track.
Measure from the tack to the front and back
of the track. Diagram these measurements.
If you draw a line from your lead block
to the center of the max hoist ,
your clew should fall on that line.
measured from the halyard raised to the top and the
tack point on the stem fittting.
The next issue is where the sail will sheet to.
There is a litttle bit of an art to determine where
the clew needs to end up to sheet to an existing lead.
If there are long tracks for the fairleads, the problem
gets easier, but where the sail sheets will vary dramatically
with varying foot and leech lengths.
If you measure from the halyard at the top down,
and from the tack point aft, to the back of the track,
you will have the max possible leech and foot measurements.
But you ideally want the clew up off the deck somewhat,
so as the leech gets shorter the foot will have to get
shorter as well.
Measure the max hoist. Measure from max hoist to
the forward and aft ends of the lead track.
Measure from the tack to the front and back
of the track. Diagram these measurements.
If you draw a line from your lead block
to the center of the max hoist ,
your clew should fall on that line.
Most all sailmakers who quote or sell online have measurement instructions. I happen to like FX Sails and their measurement forms:
http://www.fxsails.com/headsailmeasurenf.php
http://www.fxsails.com/headsailmeasurenf.php
Double-checked, link works when I click (Left or middle click) on it in IE 8 and Firefox 3.6
Anyhow, dig around for Luger sites using Google, someone will be able to tell you your rig dimensions without you having to measure.
Something else I found when getting started is that many sailing related vendors don't respond to email and require a phone call. Some (like rig-rite) don't even respond much to phone calls. Whether you do business with people who can't bother to talk to you will have to be balanced with how badly you need a part and whether you can get it from anyone else.
Have you looked into any local sailing clubs, yet? You ought to meet up with some of those folks. Tons of free advice and opportunities to crew and learn, not to mention the possibility of someone saying, "I had one of those boats ten years ago, I think I might have a 125% genny in my garage."
Here's how you measure sails: http://thesailwarehouse.com/cgi-bin/web_store_TSW.cgi?page=measure.html&cart_id=793165_2533
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You should learn your P and E dimension for the main sail and the I and J dimension for your head sail. These are universally formated dimensions which are given for all sail boats (as far as I know). Sails come in all kinds of varieties of cuts, but these dimensions can be used to determine if a particular sail can be used on your boat. There will be many used sails which may not have been cut for your boat, but the dimensions are close enough to be suitable. If you know the length of your forestay, that is also useful information to have. You can get away with a luff that is slightly short, but you don't want a sail that has a luff that is even slightly long, for reasons which will become apparent the first time you hoist the sail! If you are dealing with a sail maker on a used sail that is close to your dimensions, I would suspect that they can cut some slight modifications for you to make a better fit.
Here's your headsail dimensions, you just have to actually measure to be sure or validate the dimensions of the "fit":
Note: the 115% JIB has a shorter luff length than the 150% Genoa. !!!!!
115%LP JIB:
Westwind 20 / Southwind 20 / 21
Luff 16.21*ft (4940mm)
Foot 6.64*ft (2023mm)
Leech 14.49*ft (4416mm)
Perc LP 114.92%*
Length Perp 5.93*ft (1807mm)
Deck Angle 12.00*
Area 48.06*ft2 (4465mm2)
150% LP GENOA
Westwind 20 / Southwind 20 / 21
Luff 19.25*ft (5867mm)
Foot 8.17*ft (2490mm)
Leech 18.35*ft (5593mm)
Perc LP 150.0%*
Length Perp 7.74*ft (2359mm)
Deck Angle 3.90*
Area 74.51*ft2 (6922mm2)
I 19.60ft (5974mm) height of mast ..... from horizontal line at stem/tack to top of mast
J 5.16ft (1573mm) Tack to mast
P 23.50ft (7163mm) Hoist of mast (Mainsail)
E 12.50ft (3810mm) mast to aft end of boom/clew
Note: the 115% JIB has a shorter luff length than the 150% Genoa. !!!!!
115%LP JIB:
Westwind 20 / Southwind 20 / 21
Luff 16.21*ft (4940mm)
Foot 6.64*ft (2023mm)
Leech 14.49*ft (4416mm)
Perc LP 114.92%*
Length Perp 5.93*ft (1807mm)
Deck Angle 12.00*
Area 48.06*ft2 (4465mm2)
150% LP GENOA
Westwind 20 / Southwind 20 / 21
Luff 19.25*ft (5867mm)
Foot 8.17*ft (2490mm)
Leech 18.35*ft (5593mm)
Perc LP 150.0%*
Length Perp 7.74*ft (2359mm)
Deck Angle 3.90*
Area 74.51*ft2 (6922mm2)
I 19.60ft (5974mm) height of mast ..... from horizontal line at stem/tack to top of mast
J 5.16ft (1573mm) Tack to mast
P 23.50ft (7163mm) Hoist of mast (Mainsail)
E 12.50ft (3810mm) mast to aft end of boom/clew
The Luger forum is still active at the yahoo site. Here is a link.
http://groups.yahoo.com/group/lugerboats/
Frank
http://groups.yahoo.com/group/lugerboats/
Frank
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