Catsailor.com

New Mast Build

Posted By: Spence

New Mast Build - 03/23/16 10:22 PM

Hi all

Quick question (hopefully). I am about to knock up a new Mast for Nads-II and I was wondering if anyone out there is using an off-the-shelf fitting for the mainsail halyard hook/lock (old mast has a custom job on it which I would rather not have to reproduce)? If so, whats the critical dimension from the fitting to the halyard pulley at the top? Photos?

Cheers!
1734 [GO-Nads...The Second Cumming]
Posted By: stillbitten

Re: New Mast Build - 03/24/16 12:37 AM

Goodall Designs and Matt Stone, supply off the shelf hooks and rings (best to get matching pair from my experience).
Posted By: Tim_Mozzie

Re: New Mast Build - 03/29/16 10:14 PM

Photos are in the Mosquito rigging photo album

This is the best one
[Linked Image]

It's a standard Ronstan pulley. No rivets used, just a pin through the middle. That one is an AHPC hook. The distance I don't think is super critical but it looks like about a centimetre in the picture.
Posted By: Gary Fleming

Re: New Mast Build - 12/21/16 07:25 AM

Can someone tell me if there has been any changes to the mast section used on Mosquitos? If not does anyone have an image or drawing of the correct section?
Posted By: Tim_Mozzie

Re: New Mast Build - 01/05/17 07:00 AM

Every batch is different because the die is never set up the same twice. So the wall thickness varies.
The last batch had to be done with a new die so the walls were deliberately thickened up a little on the sides, but the shape remains the same.
The dimensions are in the building rules (which everyone has read of course smile....

[Linked Image]

The best place to get one is the VIC or SA associations.


Attached picture mast.jpg
Posted By: stillbitten

Re: New Mast Build - 01/05/17 07:03 AM

Externaly the mast section hasn't changed. Current new masts available from the association have thicker section on front and side walls, which can only be seen from the inside.

New masts can be purchased, contact details are here http://www.theracingcat.com/index.php?page=the-shop
Posted By: Gary Fleming

Re: New Mast Build - 02/04/17 05:23 AM

Next Question: What is the optimum position for a fixed goose-neck and what is the easiest way to rig an appropriate down-haul?
Posted By: Tim_Mozzie

Re: New Mast Build - 02/13/17 11:39 PM

There's some photos of 8:1 on the Rigging Photo Album

To position fittings on the mast, start from the top. Fit the mast hook first. Then put the black band where the top of the sail sits. Then measure 6.9m down from that band to position the lower band. Mark that. Put the gooseneck fitting on it. Now cut the excess off the bottom of the mast so it is right on the maximum length above the front beam when it is standing. Now you can measure the hound fitting position from the front beam. Then locate the upper diamond fittings so they don't snag on the sidestays. Locate the lower diamond fittings as low as you can get them (allowing for the downhaul cleats if you are putting them on the mast) and put the spreaders in the middle.

All measurements are in the Building Rules on the website.
Posted By: Matt_Stone

Re: New Mast Build - 03/06/17 01:57 AM

Im now running external 8:1 cunno, 6: just wasnt enough, send email and ill email pics.

I sell the top hook and ring shackle combo. My hook is off center but comes off everytime. The main halyard block is the same as in the pic above, clevis pin through the mast with a ronstan fitting as a guide. I can send all theae pics at your request

Matt
Posted By: Gary Fleming

Re: New Mast Build - 03/19/17 04:49 AM

Matt,
I've sent you an email but not sure if you received it.
Also my sail is an old one probably around 1986 vintage and I was wondering how much stretch I should expect when using an 8:1 system?
Posted By: Matt_Stone

Re: New Mast Build - 04/24/17 09:04 AM

Hi Gary,

With an old sail, it will stretch quite a bit - it all depends on the type of cloth & the shape of the sail as to what sort of stretch it will have.

Any other questions, please send me an email to yachtrigging@bigpond.com

Regards
Matt
© 2019 Catsailor.com Forums