Building a new Catamaran Beam From Scratch (Sailing Yes Let's E16)
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- Опубликовано: 5 фев 2025
- I discovered a soft spot in the forward most beam. The fore stay is attached to this, while loosing this wouldn't immediately sink the boat... I'd rather not worry about loosing the rig either so I decided to rebuild it from scratch!
I wanted to see if a fiber glassed, hollow box beam could be lighter and stronger. I'd never made a spar like this before so this was a learning opportunity!
good job... 🙂
You are an excellent example of what a person can do with few resources, but with a lot of dedication and method.
thanks for sharing
I have been following all your videos, and it has been very enjoyable
(Edgar)
thank you for the comment! I appreciate the encouragement!
Well done, Dominic! I always enjoy seeing what you have been up to! Your resourcefulness and combination of low tech and high tech in your projects is inspiring and reminds me of the Whole Earth approach that I have been inspired by since the ’70s. ❤ All the best to you! See you soon!
Great to see your longer videos up again, nice work keeping the Wharram kicking!
catching up on the videos I want to make this was actually just before the trip to Australia
Excellent process story. Thank you!!
Good to get creative with the vacuum ideas and great to have a play with some carbon fibre too. Another great vid. Cheers, Grant.
thanks! yes I think carbon is too expensive to do the whole boat in but could be worth it for small things requiring high strength
Using what you have. Owning and fixing your mistakes. Lessons learned. Not perfect but better.
Nice. Thanks for sharing this process.
Cool Beam….! Thanks for the update.
Great video. I’ve been thinking of building a Pahi 31 as my big boat build instead of the tiki 30. I live in rough waters Hawaii and it seems a bit more seaworthy.
Tiki 30 is much more comfortable to live on with much better use of space than the Pahi 31 (I've owned both.)
interesting. I've never sailed on a tiki 30 so I can't comment but the tiki 30 is lighter and less build hours, so I'd probably lean towards that. The pahi does have a straighter keel, which might make it pitch less. I did sail with a tane nui that was pitching a lot more than it felt like my boat was at that moment. The pahi is also based on hokule'a (or maybe just the same source material) so there is that connection with hawai'i too!
@@dominictarrsailing thanks for the feedback, and yes it’s true the Pahi designs are the closest to the Hawaiian Wa’a. It’s hard to decide.
@@Ron-dx9wq mahalo
No worries, Blake. Another suggestion I could make: the Tikis sail much better than the Classic or Pahi designs because of the "Wharram Wingsail" (Dutch gaff) mainsail. Because of the flex in the Wharram designs, it's impossible to get forestay tension so the jib cannot work properly. I recommend whatever you build that you update to the Wingsail - Wharram has upgrade design plans for this. Alternatively, you could go with a Polynesian crabclaw rig which is perfect (and traditional) for a flexing cat.
❤❤❤❤
Hey Dom :)
It's really satisfying to see your resourcefulness. We have a very similar approach!
Chris
thank you! yes we do!
Wood strong enough for the job is brilliant against fatigue failure and the thin glass over is mostly for the paint job. When adding heavy glass and carbon to do the work one then typically looks to a lighter core. Just food for thought.
hmm you think I could have used lighter ply? like 4mm? hmm, now that I think about it I remember my original plan was to just make a plywood beam, then I was gifted the carbon fiber. It certainly turned out a bit heavier than I'd hoped but plenty strong
The best thing about a hand saw is the battery never goes flat 😅😅
heh I don't know about that but you can always have another cheese on toast!
You made mention a couple of times of putting the carbon on the top and bottom of the beam. Maybe I’m missing something here but would it not be better to minimise deflection by having the carbon on the sides of the beam?
I didn't have enough to do all 4 sides, and I thought it was the top and bottom that is under the most stress. the forward net attaches to this beam, but also I tie my biggest sail to it, and there is an aluminium post that braces it against the forestay bridle.
Nope, he did it correctly for vertical stiffness.
For torsion and compression it should be the same all sides.
As the fore stay has a bridle, the beam is mainly in compression.
Glad to see that you gave it a generous coating inside, ideally every void should be ventilated. But guess not best in this case.
Did you fillet the ply box internally? Though of course you can only do two easily
Ply fillets may have been just as good.
👍!!!
A Tiki-style "I" beam would have probably been a better solution than a hollow box. Wharram has an upgrade pack of plans for i beams for Pahi.
I don't like the tiki beam because it has too many inside corners. such a nightmare to sand etc. Of course, it's more observable than a hollow beam, but I think it's not too difficult to just make sure the beam is really well sealed inside.
And the box beam is better in torsion rigidity
That's not a catamaran that's a floating piece of wood.
what do you think a catamaran is?