RE: [3-7Class] Digest for 3-7class@googlegroups.com - 2 updates in 1 topic

[Howden Boatbuilders]

Hey guys

Just reading some of the postings on carbon masts and prices from certain companies. Just be aware that just because something is sold as carbon, it is very much possible that although it may have carbon in it, if it’s cheap it highly likely that it has a lot of fibre in it that’s not carbon. You may say “but its black so surely it has got to be carbon !” No, not necessarily, a lot of pole and tube makers use Phenolic resin or the old resorcinol glue which is black and therefore causes E glass cloth to look like carbon. The easiest way to tell is the smell when its cut, ground or sanded, get a bit of unadulterated carbon and sand/grind or cut, then do the same to some phenolic tube and you will understand. I have a client who boasted about a cheap carbon tube for a mast stiffner he picked up from a certain central north island tube manufacturer. When I looked at it I told him his tube had carbon in it but it had a lot of E glass fibre in it. He didn’t believe me until I dissected a piece to show him it was laminated with phenolic resin and was about 40% carbon the rest E glass. Also there are different grades of carbons on the market ranging from cheap to good quality and you very much get what you pay for as well as different modulus of carbon. Also a product made from good quality carbon will be stronger and lighter than low quality carbon or phenolic products. Use a reputable source when buying your fibre, The two companies we use are #1: New Zealand Composites who are in Red Beach and the principle of the company is Dean Pannet who would be the largest importer of composites and consumables associated with composite construction and Dean is Mr Guru when it comes to composites.#2 Gurrit who are located in Albany. When it comes to C/tech, their products are Quality and to be trusted, and here again, you get what you pay for.

Hope this is helpful

Andrew Howden

Howden Boatbuilders Ltd

 

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Sent: Thursday, October 24, 2024 6:41 PM
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Subject: [3-7Class] Digest for 3-7c...@googlegroups.com - 2 updates in 1 topic

 

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·        3.7 Wanted Secondhand Mast - 2 Updates

3.7 Wanted Secondhand Mast

Chris Mitchell <secr...@3-7class.org.nz>: Oct 24 09:11AM +1300 Hi, Donald King is refurbishing some yachts and is looking for any surplus carbon masts that are spare.  So if you have upgraded to a new mast, he is looking for an older one. kind regards Chris     Secretary 3.7 Class Owners Association  +64 21 492006 secr...@3-7class.org.nz

Gavin Auld <gavin...@outlook.co.nz>: Oct 23 09:34PM Hi Everyone,   Just adding up my costs as Paul was asking about this as well. I also purchased a boom section which I am yet to use. Going this way was a bit of an experiment so if anyone wants to go the same route it's not my fault if it goes bang. This is what you pay the professionals for. I had never built a mast before, so there are some things which would be better if I did it again, but pretty happy with the outcome.   Top section has less taper than I wanted due to the mandrels available. Could probably do with increasing wall thickness on bottom section and reducing on top.   Kilwell: Mast top section $355.24 Mast bottom section $638.38 Joining Spigot $62.37   Shipping $35.00   Total + GST = $1,254.64   Oborn's Nautical: Backing plates for T Hooks Delrin plug for bottom of Mast Delrin step for boat (matches plug) $148.50 inc GST   Topfab: 2 pieces PVC Sail Track $97.29 inc GST   Sail track was glued on using expensive structural adhesive. Have since found out from Hamish that Sikaflex is fine for this.   So that's $1,500.43 - plus your usual cost for stays, whatever you want to do with halyard, and your own hourly rate! I probably spent a bit more time than needed as I was messing around with a custom halyard lock and gooseneck fitting.     Cheers,   Gavin   ________________________________ From: Derek Snow <snow...@gmail.com> Sent: Thursday, October 24, 2024 9:43:03 am To: Chris Mitchell <secr...@3-7class.org.nz> Cc: Gavin Auld <gavin...@outlook.co.nz> Subject: Re: [3-7Class] 3.7 Wanted Secondhand Mast   Gavin has put together a high modulus mast using sections from Kilwell. His performance has definitely gone up hugely since then. Gavin—how much did it cost? And what would be the reduction for putting together a standard modulus mast using Kilwell sections.   And then there's the Carbotec mast that Mike Langley has. They are cheaper than C-Tech masts. Mike's is probably too bendy but Adrian knows that.   How many boats did you get? Is there a result sheet? Last two weekends we have had 8 & 7 boats racing so best it's been here for a long time. Lincoln has new C-Tech HM stiff mast with a carbon track and he seems to have gone up a notch too.   Derek       On 24 Oct 2024, at 9:27 AM, Chris Mitchell <secr...@3-7class.org.nz> wrote:   Hi, best fun I have had in a long time. We went to 10 races on the first day. It was a delayed start and super light to begin, but good starting practice. Then breeze came in late Saturday so the club offered to run extra races in case it was too light on Sunday. Conditions were epic for final 4 races on Saturday. Then on Sunday it was light again, but not too bad and we did a further four races; total 14. As of yesterday, it was the first day where I could walk down stairs and generally move around again. The class a really good vibe and we had fun watching end of the AC.   Donald asked Willetts for a price on an SM mast, and Willetts said it wouldn't save any money. Honestly I can't think of how anyone could do more damage to our class, unless all the sailmakers get together to charge $10k per sail. I might chat to the Pauls about how we can make a cost effective mast that performs better to help ensure a future for their new yachts. thoughts?   C.   On 24/10/2024 9:16:09 am, Derek Snow <snow...@gmail.com> wrote:   Hi Chris   Sorry—I gave away my old carbon mast.   How did Rotorua go?   Derek   On 24 Oct 2024, at 9:11 AM, Chris Mitchell <secr...@3-7class.org.nz> wrote:   Hi, Donald King is refurbishing some yachts and is looking for any surplus carbon masts that are spare. So if you have upgraded to a new mast, he is looking for an older one. kind regards Chris   Secretary 3.7 Class Owners Association +64 21 492006 secr...@3-7class.org.nz   -- The 3.7 Class Owners Association uses a Google Group to distribute newsletters and messages. Members can choose in the settings all emails, digest emails, abridged emails or to view online (no emails). Each member subscribes and adjusts their own settings as desired from time to time. If you change email address then you should unsubscribe and subscribe again using the new email address. Thanks, welcome or same to you; as may be applicable. --- You received this message because you are subscribed to the Google Groups "3-7Class" group. To unsubscribe from this group and stop receiving emails from it, send an email to 3-7class+u...@googlegroups.com<mailto:3-7class+unsubscribe@googlegroups.com>. To view this discussion, visit https://groups.google.com/d/msgid/3-7class/Mailbird-9c579191-a2e3-4416-81af-291ca2c08fe9%403-7class.org.nz<https://groups.google.com/d/msgid/3-7class/Mailbird-9c579191-a2e3-4416-81af-291ca2c08fe9%403-7class.org.nz?utm_medium=email&utm_source=footer>.

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