UNDERSTANDING YOUR COMPUTER SAIL LAYOUTS
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On your order page, you will find a sail layout and a sail data
sheet for your sails. You need to confirm the luff, leech and
foot measurements to insure your sail is correct for your vessel.
Do not assume they are correct. Please be sure that everything
you want on your sail is clearly indicated on your CAD Layout and
data sheet. The layout and data sheet are the only documents
released to the production floor.
Sail measurements shown on your sail layout are from sail edge to
sail edge. Your tack and clew cutbacks would then be applied. The
sails do stretch over their life. The greatest stretch area is
along the luff which is subject to halyard tension. The foot
is hard to tension and stretches much less.
The sail is made to the luff, leech and foot measurements shown
and when you first hoist the sail, the sail will conform to those
measurements. The Max Luff, Max Foot and Max Leech will be the
size the sail will eventually stretch to over the life of the
sail. Mainsail MAX Luff should never be closer than 6" to 8" from
the mast roller.
MGM and MGU refer to the width of the mainsail at 25 percent down
from the head and 50 percent down from the head per the following
If your backstay is within 2 feet of the clew, please advise
"Backstay Issue" on your order. We will double check to be sure
sail roach does not hit the backstay.
Sample of MGM and MGU
We need you to confirm the sail sizes. You can change any
dimension you wish. We need simple sentences, such as "Make the
foot 12' 2". Please no sentences such as "If we can do this we
might be able to adjust that and then we could". Anything you
wish to change must be submitted by an email reply. Please do not
call us and ask to change something. Simply email us with your
order number and requested change and/or click reply.
Generally speaking, a tack angle for a mainsail should be less
than 90 degrees. If you have to clear a bimini or other deck
structure, tack angles become reduced, such as 88 or 87 degrees.
Please check this on your layout. Normal tack angles are 89 to 87
degrees. DO NOT ASSUME THAT THE SAIL IS CORRECT.
If you have ordered a full batten main, please check your batten
lengths. We do not supply the actual full length battens as they
cannot be shipped from Hong Kong without breakage. Full batten
pocket mains for Harken or Schaeffer systems have the luff end of
the pocket open and do not have a grommet or slide at the luff
end of the batten pocket. At that position, you attach your
batten tensioner, which should include a slider, as part of the
If we are supplying batten holders for full batten mains, then
your batten will slide in from the leech side, into the holder on
the luff. The batten will be sealed in with a double Velcro flap
on the leech end of the full batten pocket.
Please note the location of your reef points. If you have some
special reef positions, please double check that the reefs are
where you wish your reefs. Normally, the sail computer selects
the correct reef point position.
If you have ordered a Jib or Genoa, please check to be sure it is
the size you have requested. Common mistakes include measuring
** the luff without the sail shackle in place, so check your luff.
This layout is the actual size of the new normally tensioned sail.
We suggest you hoist a steel tape measure and see where the luff
length on the layout will tack. Also check the foot and leech
while tape is hoisted. Measurements on the computer layouts are
sail edge to sail edge. If you ordered a Genoa, always check the
foot length with a tape measure. Many people incorrectly assume
that the foot length is used to determine LP, it is not. Please
see the below link. The Luff measurement we supply is webbing
loop tip to webbing loop tip
Genoa Tip! Make a small line the length of the foot. Attach it to
the tack. When checking luff, leave the tape at the top position
and connect the leech length to the end of the foot line. This
will provide a very good idea as to where the clew will be.
How LP is Determined
Many sailors are always trying to get more sail area. Thus, they
are always pressing the sail limit. This can cause the sailor to
order a sail that is too big for his vessel. On Genoas, a good
rule of thumb to find the sheeting location is to use the
following formula. Foot length + (clew height * 1.25) following
the curve of the hull (line passed outside the shrouds).
Clew height is an approximation based on the I and J supplied
when ordering the sail. Vessels all have different hull and deck
curves. Additionally, furlers all have different heights off deck.
The exact correct sheeting for a Genoa is as indicated in the
How to Sheet a Genoa
If you have ordered a furling Genoa, double check your furler
luff tape size. It is a size specified by the furler manufacturer
and is different with each furler. We are looking for numbers
like #6 Luff Tape, or 3/16 luff tape (which is the size of the
cord, finished size is larger) so check the manual or call your
furler supplier, do not guess.
Tip! Look at the Luff tape finished size chart. Find a drill bit
that matched the finished luff tape size. Insert it in your
furler luff groove and be sure it slides easily.
If you have ordered a logo, we suggest you clip a copy from the
internet and attach it to your reply. Right mouse click an
internet picture, save it and then attach it to an email to us.
At the very least, describe the logo carefully.
After you confirm the luff, leech and foot measurements, please
email back to us your OK to proceed. We will not proceed on your
sail until you give us the OK. If a measurement is not what you
want, tell us now. In most cases, changes at this point do not
effect the price of the sail.
Please note that the general order form is a collection of all of
the data we have received from you. Inside the box that shows the
sail drawing is our interpretation of that information. We
guaranty our sail will conform to the drawing and the data that
is shown under the drawing. If there is a problem, we are going
to the sail drawing and the data directly under the drawing,
which we are asking you to approve.
Spinnakers and Asymmetrical Spinnakers have substantial curves,
measurements we provide are straight line measurements sail edge
to sail edge.
We are expecting comments from you like the following;
"I have reviewed the data table and sail drawing. Please proceed
to build the sail, no draft stripe please.
Order 2600112 Tom
One final note, please be sure you see APPROVED x/xx/xx after
your sail layout on your order form. This will confirm that we
received your email OK and have released your order to the loft
floor for processing.
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