Understanding Mast Rake - shortening the forestay on Paikea
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- Опубліковано 14 жов 2024
- We're playing with our forestay in this episode.
When we replaced our front beam over 2 years ago, we changed the geometry a little. The issue was we couldn't find a scrap piece of carbon mast big enough to span the width of Paikea. We came up with a solution to use two smaller pieces connected to a central longeron/bowsprit piece. We also angled the entire arrangement upwards a fraction to lift the front section away from the water.
The bows Catana42s slope down towards the water and we wanted to lift the trampoline and beam higher up. The issue we then had was that our forestay was now a fraction too long for the new setup. The longer forestay meant that our mast leaned backward more than it did before. In other words, we now had too must mast rake.
In order to fix the problem we had to buy a new forestay or shorten the existing one to fit. As we are running our upgrades on a budget and it seemed wasteful to throw away a perfectly good stay that was relatively new, we decided to shorten what we had. It did prove a bit tricky to find someone in the Caribbean who was capable and willing to take on the swaging job for us. We ended up finding a great rigging shop called FKG in Sint Maarten and finally got the mast rake where we wanted it.
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I’ve always wondered how the stays maintained tension on a rotating mast. Interesting talk about mast tuning. I’ve often seen adjustable back stays, but never quite understood their purpose. I always assumed that the mast should be a rigid, fixed plane rising up from the boat, something you do not want to move around in relation to the boat. Maybe this only applies to racing applications, but it sounds like some movement might be beneficial in certain situations.
Another great lesson learned. Thanks again.
You're welcome
Yet another great vid! Your boat is becoming an absolute beauty, I love it! Thank you.
Thanks
Wow masterclass.
I love your videos you’re explanation is so in depth that we can all follow along because of how you’re delivering it. Thank you.
Cheers mate.
I would really like an explanation on the effect and settings for forestay tension -- its importance and basic settings
Shayne does talk a bit about our saggy forestay in previous sail trim videos. But yes, it is something we can talk about in more detail in a future video
so informative 100%👍
Great content guys thanks
👍👍
Great explanation, good to see your continued progress!!!
Cheers bloke
Great discussion on rake and the importance of it, it's something that a lot of people seem to forget, the rig just gets "tensioned" and that's it, there's not really a lot of reflection on where the rig actually is.
Looking forward to the sail discussion, hoping to hear what happened to your old sail. Was it just old and UV-damaged or something else?
Thanks for the videos!
It was an old North's sail that Anna recut. It had simply come to the end of it's life and was delaminating faster than we could glue it back together.
Your info is head spinning in a good way!
So that spinning-up tri, was it professionally rigged? f'n amazing how owners rely on paid, expert help that leaves their boats un-sailable and/or dangerous. Assuming you got lots of hugs & drinks for fixing that one. PS - Anna, this mast climb music is so inspirational - where's my harness, I want to go up to that!
The tri came out of the factory like that.
And yeah that music worked well didn't it?
Love the video and explanations. How do you know how much rake to pull out? Incrementally by "feel' or do you know where you LCOE roughly lies?
Awesome explanation of the the mechanics, Yes I'd love to know the how much rake too ... before I play with it. It's nice having a boat that will round up by itself when the helm is released (tillers on an 8.5m cat) however that can be a bit of a chore when sailing fast with a small head sail. So how much rake is optimum for safety and ease of use?
@@StingrayBay instead of rounding up, a boat with sails trimmed well that will keep sailing straight with no tiller is a beautiful thing. I’d be standing your mast up in very small increments to get that weather helm down to just barely noticeable. Otherwise you’re always turning the rudder, which is riding the brakes. (I see your brake lights rolling down the freeway ;)
Well the balance is different with different sails set. Ie neutral rudder with full main and screecher set which is fine in light winds but alot of weather helm with full main and full roller jib if it's too fresh for the screecher, I can balance her again with a reefed main but then she is under powered unless it's gale force. So my question remains... what is the sweet spot for rake?
Fascinating as always!
awesome!
Thanks!
The original problem seems to have been caused by the way you rebuild your frontbeam. There will be more effects of it than just the rake. The angle of the bridle that prevents the middle of that frontbeam from bending upwards has also been changed. For the worse, that is. So.... is your bridle strong enough? Is the dolphinstriker 16:07 long enough for this new angle. How much tolerance would a racingboatdesigner give his customers, do you think ?
Good son. Ties off the halyard even though it's going through a clutch and in the self-tailer. What's the story on the forestay toggle at 2:33? Eaten by a stainless steel eating marmot?
We always tie it off at the winch as a safety precaution. It really doesn't need to be in the self tailer though. DEFINITELY DON'T leave it in the self tailer if you are using an electric winch! Clutch on and tie off is best practice.
Toggle looks funky because she doesn't like being under the furler. We spray once a week to keep those pesky s/s eating marmots away 😉
Why not just use a Sta-Lock to shorten the stay? Also interesting that you didn't build a carbon chain plate into the longeron/cross beam for the forestay? Just found your channel a week or so ago - great stuff.
I just don't trust a system like Sta-Lock. No need to build a chain plate for forestay. The piece of carbon mast we used in the cross beam is way grunty enough and the solution we have way more elegant. They'll be videos looking at what we did in more detail..Search on our blog for "longeron" www.youngbarnacles.com
First look at the designers rig plans /
Exactly 👍