SPREADER ANGLE
After all these years I am still amazed at all the spreaders
I see that are horizontal. Spreaders are designed to
withstand compression loading, not leverage. Unless
the spreaders bisect the angle between the lower half
and the upper half of the shroud, you are inviting
spreader failure with catastrophic implications. Precise
adjustment is not critical, but if the spreaders on
your mast are not canted upward (above horizontal)
by about half the angle the shroud forms with the
mast—typically making spreader inclination around
7 or 8 degrees—you may need to modify the base
fi ttings. Seize the upper shrouds temporarily to the
tip, but wait to do the fi nal adjustment until aft er the
mast has been restepped.
With the mast in place and the upper shrouds set
up loosely, get yourself hoisted to the spreaders. A bevel
gauge will help you to position the spreader tip, but if
you don’t have one, a square of cardboard and a pair
of scissors will do the job. Lay one edge of the cardboard
along the centerline of the back of the spreader
and trim the adjoining edge to match the lower half
of the shroud. Now fl ip the cardboard over as though
it were hinged to the spreader. Th e upper half of the
shroud should also parallel the cut edge. If it doesn’t,
slide the tip up or down to take out half the diff erence.
Retrim the cardboard to take out the other half and
check again to confi rm that both angles are the same.
Tighten the tip clamp or seize the shroud securely to
the spreader tip with Monel seizing wire. If more than
one shroud passes over the tip of a spreader, tightly
seize only the upper shroud. Use your cardboard template
to position the opposite spreader.
If your mast is keel stepped, don’t forget to slip
the boot over the mast before it is stepped. A section
of tire inner tube will work just as well as a special
molded boot. Turn the boot up on the mast inside
out and clamp it to the mast with a giant hose clamp
(mast boot clamp). Turn the boot over the clamp, as
if you were turning down the top of a sweat sock, hiding
the clamp. With a second clamp, attach the boot
to the deck fl ange. Protect the boot from the sun with
a fabric skirt (see Chapter 15).
The angle between spreader and shroud should be the
same above and below the spreader A = B
Don Casey This Old Boat
Поскольку угол между ветвями вант должен быть как правило 13 градусов, то 6 градусов как раз половина.
В вашем случае ванту закрепить в краспице нельзя, у меня так же, видимо у вас Проктор мачта, как у меня они были самые популярные в те годы. Когда угол установлен и ванта обтянута, краспица не будет вдигаться по тросу, а когда не обтянута, ее можно палкой подвинуть как надо.
Сообщение отредактировал Renown: 24 сентября 2017 - 03:03
К силумину, что на фото. это естественно не относится. Как заметил коллега выше, абсолютно дурацкая конструкция...
