Alpha 220 Pro-Race - Fin Box Repair

Alpha 220 Pro-Race - Fin Box Repair

Post by Kevin Mepha » Tue, 26 May 1998 04:00:00


Hi

I have just acquired an Alpha 220 Pro-Race which has had a bad fin-box
replacement carried out at some point.  The board is epoxy construction with
a foam core and I have had to remove the fin-box to dry the core out.

I have dried out the foam core but am at a loss as to how the foam around
the fin-box should be sealed before I replace the fin box in the board.  I
had considered a glass-fibre kit and seal the box in finally with epoxy
resin.

Any better suggestions appreciated.

Kev Mepham

 
 
 

Alpha 220 Pro-Race - Fin Box Repair

Post by GMWo » Tue, 26 May 1998 04:00:00

Quote:

>Hi

>I have just acquired an Alpha 220 Pro-Race which has had a bad fin-box
>replacement carried out at some point.  The board is epoxy construction with
>a foam core and I have had to remove the fin-box to dry the core out.

>I have dried out the foam core but am at a loss as to how the foam around
>the fin-box should be sealed before I replace the fin box in the board.  I
>had considered a glass-fibre kit and seal the box in finally with epoxy
>resin.

>Any better suggestions appreciated.

>Kev Mepham

Kev, bad repairs seem to last forever!  Try cutting in a piece of urethane foam
larger than the new Tuttle (or whatever) box, right through to the deck and
effectively sealing off all seepage of water into styrofoam.  Use this to bed
your new box into.  I think you may also be able to buy tuttle boxes with the
urethane surround (I cannot up here).  Also, mix epoxy and microballoons to a
stiff paste and press this into the exposed old foam core to help seal from
further moisture damage.

Most importantly, feather the repair edge back as much as you can before
beginning reglassing area.

Good Luck,  Geoff
*************************
Geoffrey M. Wood
Profile Composites, Inc.
Sidney, BC, Canada
*************************

 
 
 

Alpha 220 Pro-Race - Fin Box Repair

Post by bil kle » Wed, 27 May 1998 04:00:00

Quote:

> I have dried out the foam core but am at a loss as to how the foam around
> the fin-box should be sealed before I replace the fin box in the board.

i am confused, it will be sealed as part of installing the new fin box
and high density foam cassette with fiberglas and epoxy, no?

you might want to browse my mastrack box repair saga at:

  http://callisto.my.mtu.edu/windsurfing/mastbox/mastbox.html

--


 
 
 

Alpha 220 Pro-Race - Fin Box Repair

Post by Xracerx2 » Wed, 27 May 1998 04:00:00

I would recommend first filling the cavity with spray foam.  Rout it out and
line the box with either wood stringers or high density foam (divinicell,
airex).  To make it strong bond the box to the bottom of the deck laminate.

 
 
 

Alpha 220 Pro-Race - Fin Box Repair

Post by bil kle » Thu, 28 May 1998 04:00:00

Quote:

> I would recommend first filling the cavity with spray foam.

make sure to do a test spray first... some spray foams dissolve
certain other foams.  this could result in a hollow board very
quickly.

--

 
 
 

Alpha 220 Pro-Race - Fin Box Repair

Post by photo4y.. » Sat, 30 May 1998 04:00:00

On Mon, 25 May 1998 20:07:54 +0100, "Kevin Mepham"

Quote:

>Hi

>I have just acquired an Alpha 220 Pro-Race which has had a bad fin-box
>replacement carried out at some point.  The board is epoxy construction with
>a foam core and I have had to remove the fin-box to dry the core out.

>I have dried out the foam core but am at a loss as to how the foam around
>the fin-box should be sealed before I replace the fin box in the board.  I
>had considered a glass-fibre kit and seal the box in finally with epoxy
>resin.

>Any better suggestions appreciated.

>Kev Mepham

 
 
 

Alpha 220 Pro-Race - Fin Box Repair

Post by photo4y.. » Sat, 30 May 1998 04:00:00

Kevin,
My first advice is that if you don't have a clue, do not try to learn
on
this board. You will just be unsatisfied with the result.
This is a complex repair job and you should take it to someone who
knows
what they're doing. It should cost about 150.00(us).
Having said that, here goes:
#1 fill the cavity with 2 part polyurethane foam(not air cure)
#2install a tuttle box-why not put in the strongest box available-your

other box already blew out once.
#3Machine a thru hull hole for the new box.
#4 install the box with an epoxy batter( I use 1 part epoxy, 2parts
Microballons and 2parts fumed silica{cab-o-sil})
#5Use several layers of glass for***support on the top.
good luck,
John Green