Carbon Fibre Mast/Boom Joint Construction

Posted by ABC (oldbrochan@…>)
Can anyone on the Freedom BB explain how the mast/boom attachment is constructed on the F30/32 and presumably the F36/38 etcetera? At the point where the boom end is secured to the mast, the mast section is much thicker due to a strenghtening collar. What is this collar made of? Is it, for example, achieved by:- (a) a metal collar that is placed over/around the mast (at boom height) and then bonded into position or (b) additional carbon fibre being bonded on when the main spar is constructed? During the finishing process (partly for cosmetic reasons) the edges of the collar appear to be “filled in” to give a smooth overall finish to this joint - what material is used as the filling? Grateful for
any help. Regards David
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Posted by macks011 (macks04@…>)

The gooseneck is bonded in place with a fiberglass wrap. The edges
are faired with a resin epoxy mix and the mast is painted with
Imron. I have repaired several small cracks in the collar fairing on
my 36 by enlarging the crack, filling with West system epoxy
modified with 403 filler and painted with Interlux Brightside.



— In freedomyachts2003@yahoogroups.com, ABC <oldbrochan@…> wrote:

Can anyone on the Freedom BB explain how the mast/boom attachment
is constructed on the F30/32 and presumably the F36/38 etcetera?

At the point where the boom end is secured to the mast, the mast
section is much thicker due to a strenghtening collar. What is this
collar made of? Is it, for example, achieved by:-

(a) a metal collar that is placed over/around the mast (at boom
height) and then bonded into position

or

(b) additional carbon fibre being bonded on when the main spar
is constructed?

During the finishing process (partly for cosmetic reasons) the
edges of the collar appear to be “filled in” to give a smooth
overall finish to this joint - what material is used as the filling?

Grateful for any help.

Regards

David


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with voicemail

Posted by Fred Molden (fredmolden@…>)

I talked with Goetz marine of RI about my F35 and they said that on some boats there was an inner metal sleeve, inside of the carbon fiber. Some boats were drilled and tapped thru the sleeve to attach the boom gooseneck, some just tapped into the carbon fiber. If you let the boom too far forward when sailing by the lee one can pull those screw out. I have replace my screws by epoxying heli-coils in the mast, bedding with 3M 5200 and re-bolting the gooseneck… Been working fine.

----- Original Message -----
From: ABC
To: freedomyachts2003@yahoogroups.com
Sent: Friday, February 03, 2006 6:12 AM
Subject: [freedomyachts2003] Carbon Fibre Mast/Boom Joint Construction

Can anyone on the Freedom BB explain how the mast/boom attachment is constructed on the F30/32 and presumably the F36/38 etcetera?

At the point where the boom end is secured to the mast, the mast section is much thicker due to a strenghtening collar. What is this collar made of? Is it, for example, achieved by:-

(a) a metal collar that is placed over/around the mast (at boom height) and then bonded into position

or

(b) additional carbon fibre being bonded on when the main spar is constructed?

During the finishing process (partly for cosmetic reasons) the edges of the collar appear to be “filled in” to give a smooth overall finish to this joint - what material is used as the filling?

Grateful for any help.

Regards

David


Yahoo! Messenger NEW - crystal clear PC to PC calling worldwide with voicemail