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Document No.: 304S/MM
Date of Issue:
08/14
6-14
H
P
H
Ltd.
6.5.4 Extra Equipment
Attachment Point Reinforcement
If you have to attach something on t he shell, the same rules apply
as in wood construction. The area must be strengthened before
cutting ' any holes or inserting screws.
To accomplish this, roughen the place and put some layers of
glass onto the area, each larger than the proc eeding layer, and
also changing the direction of the weave. The strengthening shall
be in a realistic relation to the weight it must carry. A 1/8 inch
diameter tubing does not need as much as an instrument
weighing two pounds. In doubt you make some tests on a
separate piec e of wood or fiberglass.
A
For loops, hooks, sockets, tubes: Sand the area, wrap the part
with glass cloth around the tube and another layer lapping over to
the skin, and let harden in position.
B
Greater strength is achieved by wrapping the part with soaked
strands of rovings. Spread the end out over the shell and secure it
with an additional layer of cloth.
C
You can also build a removable attach point:
1.
First cover the shell with foil and then proceed as
described above. After hardening remove the bushing
including all the glass.
2.
Cover the back side of this attachment plat e with foil
and drill the necessary holes for the connection bolts
through the plate and foil.
3.
Sand the area where the attach points, should be
located and cover it with the necessary layers of glass
cloth.
4.
Roughen the hex agons of the necessary screws with a
file, the rougher the better. Protect the screws than
against rust, by primer or by zinc or cadmium plating.
Cover shank and thread of the screws with grease, but
the head must remain clean.
5.
Apply 2 to 3 layers of glass onto the prepared backside
of the attachment plate, clear the holes of weaving and
push the screws through so that the heads come to rest
on the wet glass.
