![](3D"p19-asymm-rigging_files/image001.gif")
IMPORTANT- READ THIS!!!
General Instructions
Your boat may have optional or owner
installed hardware that may interfere with the recommended locations for
installing hardware described in this guide.
These guidelines can't anticipate problems with hardware that is alr=
eady
on the boat.
Before you drill any holes to mount
blocks and other hardware, check the position carefully to ensure that lines
have a fair, fiction-free path. T=
ape the
hardware in place, run some line through it, and check carefully to ensure =
that
the lines run freely, do not chafe against the cheeks of the blocks, and th=
at
you can reach them easily.
When you install the hardware, use a
sealant around the fasteners to prevent leaks.
We recommend polysulfides (like 3M 101), and modified polyurethanes
(like 3M 4200) for sealing fasteners. We
do not recommend extremely strong polyurethanes (like 3M 5200) which are
intended for permanent bonding.
The cabin top and sides of the P19 =
have
balsawood coring. When you install
hardware fasteners, you must take extra precautions to prevent water leaking
into the wood core and causing rot. We
recommend building epoxy fillets around the holes you drill. (See http://www.blumhorst.com/potterpages/gennytracks/installinggennyt=
racks.html
for one method of building fillets)
The side decks of the P19 are solid
fiberglass. There is no balsawood=
coring
there, so there is no reason to build epoxy fillets.
INSTALLATION OF RIGGING FOR A P19
ASYMMETRIC SPINNAKER
IMPORTANT
DISCLAIMER: THE INFORMATION IN TH=
IS
DOCUMENT IS PRESENTED ONLY FOR THE PURPOSE OF DISCUSSION. IT IS A DRAFT AND MAY CONTAIN SUBSTANT=
IVE
ERRORS.
This document was
written by Judy Blumhorst. She =
is not a
professional rigger, nor does she make any claims to be an expert in the fi=
eld
of boat rigging.
Judy does not have=
any
formal training in rigging, nor any professional creditionals in the field =
of
boat rigging.
Judy is not an exp=
ert on
asymmetric spinnakers either. <=
/span>
This document cont=
ains
some of Judy's ideas regarding how to install the rigging necessary to fly a
small, asymmetric spinnaker on a Potter 19.
Neither Judy Blumh=
orst,
nor any person who reproduces this document with or without permission, cla=
ims
or represents that the equipment describe herein or method of installation
contained herein is advisable or safe.
USE YOUR OWN JUDGE=
MENT
WHEN YOU INSTALL HARDWARE FOR AN ASYMMETRIC SPINNAKER.
-----------------------------------=
---------------------------------------------------------------------------=
----------------
©2005 All rights reserved. Judy Blumhorst www.blumhorst.com
Rigging needed for flying an Asymme=
tric
Spinnaker
- Two spinnaker sheets (shown below)
- The spinnaker halyard (shown in this pic=
ture
on the port side of the mast and cabintop.
However, we suggest installing it on the starboard side of the =
mast
and cabintop)
- The spinnaker tackline (shown below on
starboard)
=
![](3D"p19-asymm-rigging_files/image002.gif")
On our 1985
Potter 19, Redwing, we launch and douse the spinnaker from a turtle bag han=
ging
in the companionway. This means t=
hat the
crew member remains in the cockpit at all times. Launching and dousing is usally done
while sailing on starboard tack.<=
span
style=3D'mso-spacerun:yes'>
We prefer to launch the spinnaker w=
hile
sailing on starboard tack (with the boom out to starboard and the wind comi=
ng
from the starboard side of the boat).
Boats on starboard tack generally (not always!) have the right of way
over sailboats on port tack.
We also prefer to stand on either t=
he
centerline or the high side (the starboard side when sailing on starboard t=
ack)
during launching.
The asymmetric spinnaker is launche=
d and
retrieved over the port side of the boat, in the wind-shadow of the mainsai=
l.
The controls for setting and dousin=
g (the
tackline and the halyard) are located on the starboard (right) side of the
boat. Having the line controls on the opposite side of the boat from the la=
unch
keeps the sail from covering up the cleats one the lines if we have to abort
the set.
We can laun=
ch the
asymm in under 30 seconds, and more importantly, we can usually douse it in
under 15 seconds if the need arises -- all without leaving the safety of the
cockpit.
OVERVIEW OF RIGGING FOR AN ASYMMETRIC SPINNAKE=
R
-----------------------------------=
---------------------------------------------------------------------------=
----------------
©2005 All rights reserved. Judy Blumhorst www.blumhorst.com
Ro=
nstan 40
mm Smart Rachet for sheet blocks
See http://www.ronstan.com/c=
atalogue/p024.pdf
FEATURES
- Low friction, 2-stage ball bearing system
provides consistent performance over the full load range.High static a=
nd
dynamic load capacity.
- Cheek cut-outs for easy bearing maintena=
nce.
- Load-sensitive ratchet engages automatic=
ally
when the sheet is loaded and disengages when the load is released for
smooth, free running in tacks and gybes.
- Saddle RF94A and spring RF319 available =
for
stand-up block configuration.
- Precision CNC machined alloy sheave prov=
ides
up to 14:1 holding power, yet minimises rope wear for extended sheet l=
ife.
- Unique adjustment mechanism allows the
engagement load to be set precisely as required. Higher setting keeps the ratchet =
off for
light air sailing or until the sheet load increases. Lower setting will trigger the ra=
tchet
at a lower sheet load. Ratchet engagement setting can also be varied to
suit the load felt in your hand, so that younger sailors can set the
engagement at a lower load to match their strength.
=
Location of=
2
sheet blocks:
Install one smart ratchet block (wi=
th a
stand up spring and eyestrap) on each side side of the boat, on the side de=
ck,
as far aft and as far outboard as practical.
Use washers as backing plates.
Location fo=
r cam
cleat:
Choose one of the following two opt=
ions:
- If you don't have winches on the coaming:
Install one cam cleat on each side of the boat, on top of the
coaming, a few inches aft of=
the
cam cleat for the jibsheets (so that the spinnaker sheet doesn't cross
over the jib sheet). Posit=
ion the
cleat at an angle so that there is a fair lead from the ratchet block =
to
the jaws of the cam cleat. U=
se
washers as backing plates.
- If you have winches on the coaming, you =
can
run the bitter end of the spinnaker sheet from the smart ratchet block,
forward to the winches, and then to the cam cleat. Install the cam cleat in a positi=
on
where it has a fair lead from the winches to the jaws. <=
/li>
W=
hy do we
use a cam cleat without a fairlead for the spinnaker sheets? We don't want a fairlead on the cleat =
for the
spinnaker sheet because. In the event there's a snag in the spinnaker
sheet, it could get caught in the
fairlead and prevent us from releasing the spinnaker sheet if a broach
occurred. If your existing jibshe=
et
cleat has a fairlead built in, don't use it for the spinnaker sheets.
SHEET BLOCK=
AND
CAM-CLEAT INSTALLATION:
![](3D"p19-asymm-rigging_files/image005.gif")
Ronstan SmartRatchet on stand up
<=
img
src=3D"p19-asymm-rigging_files/image006.gif" width=3D210 height=3D226>
-----------------------------------=
---------------------------------------------------------------------------=
----------------
©2005 All rights reserved. Judy Blumhorst www.blumhorst.com
Install two
fairleads for the tackline at the bow:
- Install one Spinlock fairlead WL/1 on th=
e top
center of the bow pulpit. If your mast attaches to the center of the b=
ow
for trailering, put the fairlead slightly off center, towards starboar=
d.
- Install a second WL/1 on one of the star=
board
pulpit legs, down low near the deck.
![](3D"p19-asymm-rigging_files/image007.gif")
The tackline runsfrom the tack of t=
he
sail, through a fairlead mounted near the center of the bow pulpit, and then
through a fairlead mounted near the bottom of the pulpit stanchion on starb=
oard
side.
![](3D"p19-asymm-rigging_files/image008.gif")
Cam cleat without a fairlead, for t=
he
tackline
The tack-li=
ne
will be adjustable from the cockpit.
- For sailing deeper downwind, ease the ta=
ckline
to rotate the the sail out in front of the bow, with the luff across t=
he
centerline to windward.
- For sailing on a reach, tighten the tack=
line
to keep the luff on centerline, pull the draft forward and open the le=
ech
of the sail, giving it a more genoa-like shape.
The tack of=
the
asymmetric will be attached to the bow pulpit
- This maximizes the separation between the
mainsail and the spinnaker, and makes it easier to keep the spinny fil=
led
with air when you sail deep downwind.=
- Decreases the chances of snagging the as=
ymm on
the pulpit during a gybe. Th=
e P19
pulpit projects quite far forward beyond the bow of the boat, making i=
t a
great place to catch the spinnaker on.
- Attaching the tackline to the bow pulpit=
makes
it possible to do "inside gybes" possible on the P19, even
though the boat does not have a bow sprit, because it puts the tack of=
the
sail a significant distance away from the forestay
![](3D"p19-asymm-rigging_files/image010.gif")
The tackline runs from the bow aft =
to a
cam cleat mounted on the side of the cabin (or to a camcleat mounted on on =
the
side deck, within reach of the cr=
ew
member)
Install a c=
am
cleat for the tackline near the cockpit:
For the tackline cleat, use the cam=
cleat
without an eyestap on top of the jaws. Use washers for backing plates.
There are two options when deciding=
where
to install the camcleat near the cocpit.
Choose the one which gives you the best lead and avoids interference
with existing hardware.
- Option 1:
On the starboard side of the cabin-wall, near the aft edge, and=
an
inch or so up from the side deck, where you can easily reach it from t=
he
cockpit. This option has=
the
advantage of keeping your side decks clear of lines that could trip a =
crew
member.
- Option 2:
On the side deck, anywhere between the front edge of the cockpit
and the middle of the cockpit.
Note: I don't recommend that you us=
e a
camcleat with eyestrap for the tackline.
If something goes wrong and you need to get the sail down fast, it's
necessary to release the tackline
instantaneously. If the li=
ne is
tangled or hockled, the fairlead could stop it from playing out freely.
-----------------------------------=
---------------------------------------------------------------------------=
----------------
©2005 All rights reserved. Judy Blumhorst www.blumhorst.com
HALYARD BAIL INSTALLATION
HALF-WAY BETWEEN
THE TOP OF THE MAST AND=
THE FORESTAY
![](3D"p19-asymm-rigging_files/image011.gif")
Drill two holes in the mast on the =
Y-axis
, half way between the forestay and the top of the mast.
OVERVIEW:
- The block for the spinnaker halyard will=
be
attached half-way between the forestay and the top of the mast.
- The block will be suspended from a bail.=
- The bail will be attached to the mast us=
ing a
1/4" through-bolt.
- The through-bolt will pass through a
compression post made from aluminum tubing, to protect the mast from b=
eing
damaged by the through-bolt
STEP ONE:
- Mark the
location for the halyard bail and block half-way bet=
ween
the top of the forestay and the top of the mast.
Step Two:
Drill two holes in the mast for attaching the bail for the halyard.<=
/span>
- You wil=
l need
to drill two holes for the through bolt on the side of the mast, throu=
gh
the widest part of the mast. Make a
template before drilling, per the following instructions:
- Wrap a strip of paper around the mast a=
nd
tape it there.
- Mark both edges of the opening on the a=
ft
face of the mast,
- Remove the paper strip. Cut the paper s=
trip
at the pencil marks. Fold the paper in half length-wise and make a pe=
ncil
mark on the fold.
- Tape the paper to the mast again. Align=
the edges of the paper strip wit=
h the
edges of the opening. Put a=
mark
on the paper at widest part of the mast (on the Y-axis in the picture=
to
the right) on the port side.
- Remove the paper, fold it in half
length-wise, and hold it up to the light.
Trace/make a pencil mark on the starboard side of the paper st=
rip
for the hole on the starboard side of the mast
- Tape the
strip of paper to the mast, half-way between the top of the forestay a=
nd
the top of the mast. =
- Check to confirm that the marks for the=
holes
are both located very close to the widest part of the mast, and are
opposite each other.
- It is not necessary to locate the Y-axi=
s with
great precision. If you are=
within
1/8" of the precise location, it'll be fine
- Use a s=
harp
centerpunch to mark the center of the holes for drilling.
- Drill a=
small
pilot hole on each side of the mast. Take care prevent the drill bit f=
rom
jumping out of the centerpunch marking.
- Enlarge=
the
hole to the correct diameter for the compression post (the aluminum
tubing)
- The diameter should be approximately
3/8", but check to confirm that it was manufactured with the cor=
rect
diameter before drilling.
![](3D"p19-asymm-rigging_files/image012.gif")
Harken 29 mm Carbo swivel block for
spinnaker halyard
![](3D"p19-asymm-rigging_files/image013.gif")
Install the bail using a 1/4" =
bolt
through an aluminum tube compression post.=
(shown here on a boom, but the method is similar)
The picture above
shows a bolt and compression tube inserted through the boom before the tube=
was
trimmed to the correct length.
I took the pictu=
re
that way so viewers would be able to see the tube. If I had cut it to the proper length, =
it
would have been difficult to see the compression tube inside the mast.
After I took the
picture, I cut the tubing to the correct length.
![](3D"p19-asymm-rigging_files/image014.gif")
Rontan bail (part RF 10450) =
STEP THREE: ATTACH THE SPINNAKER BAIL TO THE MAST,=
WITH
THE THROUGH BOLT AND COMPRESSION TUBE
- Slip the 1/4" bolt=
into
the aluminum tubing. Slip the
bolt/tube thru the holes in the mast.=
Trim the aluminum tubing so the ends of the tube are flush with=
the
outer wall of the mast.
- Check the fit of the ba=
il on
the mast. You may have to op=
en it
wider or squeeze it smaller to make it fit. It should touch the sides of the =
mast
lightly. It should not pinch=
so
tightly that it squeezes tight against the mast.
- Coat the
1/4" bolt and the inside of the aluminum tube with a good =
corrosion eliminator and
anti-seize lubricant (to prevents seizing and galvanic corrosion betwe=
en
the alumunum and the stainless steel metal.)
- =
One of the best anti-seize
lubricants for use in the marine environemtn is TefGel. Lanocote is al=
so
good, but doesn't last long in hot climates. Vaseline works too. You
should disassemble the hardware and inspect it periodically for safety=
.
- Install=
the
bail on the mast, using the through bolt, compression post and a nylock
nut. Tighten the nut only en=
ough to
snug the bail to the side of the mast.
It is not necessary make the nut so tight that the bail doesn't
swivel.
- Put the
Harken 28 mm Carbo block on the bail.=
Tape the ring with rigging tape, to prevent it from coming loos=
e.
-----------------------------------=
---------------------------------------------------------------------------=
----------------
©2005 All rights reserved. Judy Blumhorst www.blumhorst.com
![](3D"p19-asymm-rigging_files/image016.gif")
Install a camcleat on the starboard=
side
of the companionway, for the spinnaker halyard.
HALYARD TURNING BLOCKS AND C=
AM
CLEAT INSTALLATION
- Install a halyard turning block near the=
base
of the mast, on the starboard side.
Use washers as backers. Use
sealant. It is highly recomm=
ended
that you protect the balsa core by making epoxy fillets.
- Install a cheek block on starboard side,
outboard and slightly aft of the mast.Position the cheek block so that=
the
line is deflected less than 90 degrees.
Use washers as backers. Use
sealant. It is highly recomm=
ended
that you protect the balsa core by making epoxy fillets.
- Install a camcleat for the spinnaker hal=
yard
on the starboard side of the companionway, as close to the centerline =
as
practical. Use washers as
backers. Use sealant. It is highly recommended that you
protect the balsa core by making epoxy fillets.
-----------------------------------=
---------------------------------------------------------------------------=
----------------
©2005 All rights reserved. Judy Blumhorst www.blumhorst.com
![](3D"p19-asymm-rigging_files/image003.gif")
![](3D"p19-asymm-rigging_files/image004.gif")
![](3D"p19-asymm-rigging_files/image009.gif")
![](3D"p19-asymm-rigging_files/image015.gif")
![http://www.harkenstore.c= om/IMAGES/150.jpg](3D"http://www.harkenstore.com/IMAGES/150.jpg"){kind=link}