Centreboard case not true

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witchcraft
Posts: 13
Joined: Tue Oct 18, 2016 9:23 am
Location: Suffolk

Centreboard case not true

Post by witchcraft » Fri Sep 29, 2017 12:55 pm

My ancient Hornet needed a new centreboard. I shook the money tree and contacted Milanes they asked me the width of the case and the width and shape of the old board. The case was 25mm wide along the top and the board 24.5mm at the pivot (gybing board) they supplied a superb replacement (non gybing).

It doesn't fit. The case tapers towards the keel from 25mm at the crewdeck level to 21-20.5mm at the keel. Rob at Milanes (who has been brilliant) has taken the foil down to around 23mm but can't go any narrower as he is hitting the glass now. I think this is just a poorly made (Goodwin kit) Hornet case, I can't see any rot on pictures taken of the inside of the case (it sits under a crewdeck-buoyancy tank or see anything damp externally.

Simple question, can I sand out 1.5mm from the lower part of the case and then reproof it (epoxy?). If so any hints or tips, failing that have I just bought the doings of a nice nautical themed coffee table. :-(

Scrappy case internal measurements attached
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Last edited by witchcraft on Fri Sep 29, 2017 2:58 pm, edited 1 time in total.
Hornet K1798 Vermiscious Knid

(And RS Vareo 572 )

Aquarius
Posts: 105
Joined: Thu Jul 13, 2017 11:08 am
Location: Woodbridge Suffolk

Re: Centreboard case not true

Post by Aquarius » Fri Sep 29, 2017 2:38 pm

What's keeping the water from wetting the sides of the case now? Paint, epoxy, nothing much?

I'd say "yes, you can easily lose that much", but you would really need to lose a bit more.

Centreboard cases are funny things.
CVRDA eligible:
1962(?) Firefly F3163 "Aquarius"
1946 International Fourteen K478 "Galatea"
Not CVRDA eligible:
1991(?) Nethercot IC K229, "Ogaf the Unbearable"
Squib. possibly number 251, "Squirt"

witchcraft
Posts: 13
Joined: Tue Oct 18, 2016 9:23 am
Location: Suffolk

Re: Centreboard case not true

Post by witchcraft » Fri Sep 29, 2017 2:54 pm

Its currently coated with old varnish - thanks
Hornet K1798 Vermiscious Knid

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Aquarius
Posts: 105
Joined: Thu Jul 13, 2017 11:08 am
Location: Woodbridge Suffolk

Re: Centreboard case not true

Post by Aquarius » Fri Sep 29, 2017 4:48 pm

Thinking about this, the wringing load imposed on the case whilst sailing upwind is taken by the crewdeck at the top of the case and by the keel/hog structure at the bottom of the case, with not that much load coming on anywhere else. So, since the keel/hog structure is massively strong, it ought to be OK to cut back a few mm on the case sides at the bottom... enough to get the new board in happily and with space to coat the new thinner sides with epoxy...?
CVRDA eligible:
1962(?) Firefly F3163 "Aquarius"
1946 International Fourteen K478 "Galatea"
Not CVRDA eligible:
1991(?) Nethercot IC K229, "Ogaf the Unbearable"
Squib. possibly number 251, "Squirt"

witchcraft
Posts: 13
Joined: Tue Oct 18, 2016 9:23 am
Location: Suffolk

Re: Centreboard case not true

Post by witchcraft » Fri Sep 29, 2017 5:39 pm

Yup - thats the plan, I wanted the sanity check you have just provided.
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Chalky
Posts: 41
Joined: Sat Sep 05, 2015 8:57 am

Re: Centreboard case not true

Post by Chalky » Fri Sep 29, 2017 6:43 pm

Do you know the thickness of the sides of the plate case? I don't know anything hornet specific but could it be 4mm ply with stiffening? If so, chopping out 1.5mm or so might not be a good idea.
Do a proper job and put a new case in it!

Rupert
Posts: 6224
Joined: Thu Sep 16, 2004 8:40 pm
Location: Cotswold Water Park

Re: Centreboard case not true

Post by Rupert » Sat Sep 30, 2017 11:35 am

Trying it loses you little. If it works, you'll be able to fit the board. If not, you'll need to build the new case you'd have had to build as Chalky suggests, and get a true fit.

Pretty sure most of us will have had this problem at some point. Even if you measure top and bottom, you can then find it bows in the middle!
Rupert

alan williams
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Joined: Thu Sep 16, 2004 10:44 pm
Location: Devon

Re: Centreboard case not true

Post by alan williams » Sun Dec 30, 2018 8:39 pm

If this was Duncan Nicholson’s old boat Super Zonker the case was a diamond shaped as was that of the original Revolution. The boards for them were made specially ( custom), to gybe in the case.
Alan Williams Horneteer for nearly 40 years.

witchcraft
Posts: 13
Joined: Tue Oct 18, 2016 9:23 am
Location: Suffolk

Re: Centreboard case not true

Post by witchcraft » Mon Dec 31, 2018 8:18 am

alan williams wrote:If this was Duncan Nicholson’s old boat Super Zonker the case was a diamond shaped as was that of the original Revolution. The boards for them were made specially ( custom), to gybe in the case.
Alan Williams Horneteer for nearly 40 years.
Thanks Alan, mine was just slightly warped (sadly) since been sanded true and epoxied and it works fine. You should be able to see it at the Saturday of the B'Sea Hornet open and at Stone for the Nat's
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JimC
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Re: Centreboard case not true

Post by JimC » Tue Jan 01, 2019 2:42 am

I fear you should do the job properly and get a new board that fits...

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