开云体育

Took my "Fish-clone" out this weekend amd broke 3 sail rings. I have
not been able to find any locally so can anyone tell me the diameter
of the real Sunfish boom? If my boom is the same size I could order
replacements form the web.

Thanks,

Ed

Hi,
Another option is to simply lace the sail on with any heavy nylon cord.
"Parachute" cord come to mind.
Two long cords in a spiral wrap would do nicely. One for each spar.
Works good on my 'fish.
Dave J
sd0044@...
=========================================

Ed,

I'll try and get a boom measured for you in the next few days. In the mean
time, if you want to go sailing you can use a couple of alternatives to the
"Shower Curtain Rings".

A down and dirty replacement is nylon zip-ties. They work great in an
emergency and are a (pardon me) zip to install on the fly. The down side of
zip-ties is that most are not made with a UV inhibitor in the plastic so
they get brittle and break after being exposed to direct sun for a couple of
months.

The other substitute commonly used is low stretch line. The reason for low
stretch is so you maintain an even sail edge. In the Sunfish Class FAQ page
Bishop Stieffel notes: "I recommend using spec 12 for sail ties. Tie an
over hand knot (the first half of a square knot ) through the grommet and
around the boom. Place a pen or pencil between the line and the boom and
finish the square knot - this helps you keep the sail tied at a consistent
distance from the spar. Sometimes, I've had square knots come loose, so I
make sure that I've cut my ties long enough to use each end of the tie's
leftovers to tie a half hitch around the sail tie".

As Bishop points out you want a little distance between the sail and the
boom. This is so the sail can take the proper shape.


Wayne

Hello Ed,

I checked the Sunfish spars and they measure at 1 1/2" outside
diameter. The sail ring measures about 1 5/8" inside diameter.


Wayne





--- In sunfish_sailor@..., "Ed" <conley49@p...> wrote:

Took my "Fish-clone" out this weekend amd broke 3 sail rings. I

have

not been able to find any locally so can anyone tell me the

diameter

of the real Sunfish boom? If my boom is the same size I could

order

replacements form the web.

Thanks,

Ed

Great, thanks for the measurements, Wayne, they match my "Fish-clone"
exactly. For now I am going to use tie-wraps until I order a set of rings.

Just for fun.... How fast has a Sunfish actually gone? I would guess that
there is a limit at which catastrophic boom/sail/mast failure could occur.

I have never approached top speed as I have yet to sail with fewer than two
aboard.

Cheers,

Ed

Ed,

The commonly used hull speed formula is: 1.34 X the square root of LWL =
Speed (in knots)

A boat's LWL (Length at Water Line) is equal to the distance between the
wave
crests created at the bow and stern by the boat's motion through the water.

A boat rides in the trough between the two wave crests when it is at it's
theoretical maximum hull speed. In reality this formula was developed for
keel boats and many other factors including displacement, beam, and the
shape
of the bow and stern are also involved.

Planing hulls, such as centerboard dinghies, are capable of exceeding their
theoretical hull speed when they achieve a planing attitude. This is
accomplished under wind conditions that are strong enough to propel the boat
up it's own bow wave. The boat is lifted partially out of the water as it
rides
the crest.

Theoretical hull speed for a Sunfish having a LWL of 13.9' = 5 kt (6 mph)

LWL is probably a couple of inches shorter than the total boat length, but
this makes little difference in the results of the equation.

I don't know of a "fastest speed" figure. Maybe someone who races a lot
knows of a recorded speed. I have heard of people using the latest marine
GPS devices to clock speed, but so far nothing for a Sunfish.

As for busting stuff, yes there is a limit. Factors include crew weight,
wind velocity, equipment fatigue, and sailing technique. I have folded spars
by sailing close-hauled when I should have fallen off the wind - both for
efficiency and stress on the equipment. Then again I have all the ballast a
Sunfish can take and a little bit more ...and something has to give - and it
will.



Just as a note of trivia - theoretically, eliminating all friction,
something sail powered can achieve a speed triple that of the wind. Ice
boats designed for speed trials come very close. The speed record for a
sailboat - a trifoiler - is somewhere just over 50 mph in (I think) a 25 mph
wind.


Wayne

Instead of using tie wraps which can tighten by accident use some thin line...

Wayne <wcarney@...> wrote:Hello Ed,

I checked the Sunfish spars and they measure at 1 1/2" outside
diameter. The sail ring measures about 1 5/8" inside diameter.


Wayne





--- In sunfish_sailor@..., "Ed" <conley49@p...> wrote:

Took my "Fish-clone" out this weekend amd broke 3 sail rings. I

have

not been able to find any locally so can anyone tell me the

diameter

of the real Sunfish boom? If my boom is the same size I could

order

replacements form the web.

Thanks,

Ed

Yahoo! Groups SponsorADVERTISEMENT

If you do not wish to belong to Sunfish_sailor,
you may unsubscribe by sending an email to:

sunfish_sailor-unsubscribe@...

Please do not send unsubscribe requests directly to the group.


USEFUL ADDRESSES

Post message: sunfish_sailor@...
Subscribe: sunfish_sailor-subscribe@...
Unsubscribe: sunfish_sailor-unsubscribe@...
URL to egroups page:


Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service.



---------------------------------
Do you Yahoo!?
Yahoo! Platinum - Watch CBS' NCAA March Madness, live on your desktop!