Cats that haven't got enough underwing clearance slam weather they lashed or solid. I have a similar designed cat to a Wharram and it is solid with 3 beams that are bigger than on the Wharrams and solidly connected right into the bottom of the hull. My boat is 42 feet long with 25 feet beam but it has 1 meter of clearance and it has never slammed. I live and sail on that boat for 27years. The boat is about 36 years old and there is no stress cracking anywhere because it is very strongly build. However, the lashings on Wharrams take some of the shock out of it when say, broad reaching. My boat has a bit of a jerking motion that the Wharrams don't have, but I also have a wider beam, which adds to it. I have the benefit of a bridgedeck cabin and access into the hulls from that cabin, but it is a trade off. All the best with your project. I do like the Wharram designs, they're great boats.

Slamming , like you say is created by not enough clearance under the Bridgedeck ,Wharrams have miles of clearance.The movement , as slight as it is due to lash I go has nothing to do with slamming I believe , lashings seem like a pain , if I could glass the beams on or bolt with rubber as you have I would be happier. I was fortunate enough to meet Tom Hembroff who along with his brother lashed the first Ariki Beams together when they had to …..thanks for sharing ,interesting stuff.

Nice to have you back on my screen Randy. Motivation to keep posting videos can be a challenge. I appreciate that you do, thank you. Bet the other beams will go quicker now too.

Well the weather was pants this year so i hope you got your other cabin top beam seat fixed? Mark Wilding sailing has made some progress on his Pahi 42' and has had it out on the water he's built his own boom. And done most of his rigging .... With advice from Hanneka...

stop messing with the tiki 26 , and finish the f,,,n job on the tehini,,, cheers

Congratulations. Really. Progress is often hard to come by!

Have you seen Mark from wilding sailing...hes been rebuilding a Pahi 42 in the Netherlands . Just had it sailing for the first time. Since ot was built ten years ago and left floating unfinished.

the tehini is still waiting for a sail...

Have you experimented with regen under sail on the spirit?

Looks good 👍👍

Awesome your back

Great to see some concept testing and experimentation going on!

Those beam-troughs and beams are certainly worth tackling by the looks of things. Good to know there is a keeper who will takes care of this vessel. Thanks for posting Randy. I hope you get your fill of boat work done this summer. Cheers Grant.

Good job. 👍👍

If your boat is like my Tiki30 inbuild, then that is the keel backbone and outboard are just hull stringers. I know you said that they are only temporary but it makes me cringe to see them just leaned against the hull and backbone. :) Looks like a nice solar setup. You could make a few shekels by having affiliates links for that type of stuff.

Looks like the block acts as a pivot for the hull to move on.

I have to say ive seen a bunch of other wharrams and your has much smaller beams then the others. The trawths are larger than you beams.

Just found your channel, this is my 2nd video, subscribed during the 1st. I'm digging the detailed explanations and thought processes, please keep the vlogs coming as you refit.

I dont wish to appear negative, but why do a fair few wharrams suffer rot....and i mean a lot ? There are a few youtube videos of warrams and they all seem to start with cutting the boat to bits(lol) to get rid of rot. Is it the glass over ply design, or just neglect ? Sorry if this appears a bit negative but when i win the lottery one of my choices was a warram....not sure now though :)

Funny how that works with shallow draft even with a wide beam and docking close to shore a lot of places.

You mention decking the fore and aft deck. I did that with the Pahi. In short steep waves the half covered planked foredeck get slammed and digs in the waves. And the Pahi-designs are known to have more buoyancy in the bows than the Tiki/Tehini’s.

I don’t understand why you do this? Do you have the buildingplans ? Are you a better designer than James and Hanneke ? My experiences with Tiki 26 and Pahi 31 is that everytime I thought to do something better than the original design it turned out to have many additional problems that I had not foreseen.

Awesome work!

Glad you have found the answer now.

great work! I love your yurt! and your workshop pretty well set up! It's so interesting to see how designs evolve. I think the lashed beams are also a great fashion statement!

Loving this story

...make a camp ,a place to sleep dry ,and cook some food ....boats need to know you are building it as home....i speak from experience....

The beams are held up by the bolt. The rounded block just holds them at the right level to put the bolt through. Then the rubbers stacks pull down only on the edges. The pahi has a system like this, with the central bolt, except with lashings instead of rubber. but the tiki range have blocks preventing the beams moving side to side, and lashings only. In my pahi restoration, I removed the bolts (there was rot around nearly every bolt hole, also) and added blocks on the underside of the beams so they couldn't slip sideways, and they now rest on rubber pads on the hull trough corners. I think the central bolt is a bad design, because it puts a lot more stress on the hulls because the load is closer to the fulcrum (the central bolt). For example on the pahi 31, with the central bolt at half a hull beam 0.6m on a 4.4m crossbeam, that's 7.3 times leverage, but if it's on the edges of the hull (1.2) it becomes only 3.6 times! so it's a lot less stress on the connection!

What a cool, relaxed video editing style. Will be watching closely to see how this is resolved. Thanks for sharing.

Surely you can wake the batteries up with the solar charge controller? I have lifepo4 batteries, and I think they are great, different brand, so maybe mine behave differently... I have hit the BMS but I didn't have any problems getting them back going again. I do have a lot of solar though, and NZ is a bit sunnier than Ireland!

those flush mount handles are no good! they just create a pool of water if installed horizontally! I tried to find purchase a handle like that, but couldn't find any that didn't have that problem! I had to invent my own (unfortunately not yet perfected!)

what's wrong with the mast step? it looks, as we say in the boat restoration biz, "pretty solid"!

interested how that anti-condensation device works? is it just a sleeping tent inside the boat?

nice that the batteries don't need to sit on top of that joist/ stringer. Who knows if it has that type of strength? Also you will likely consider the weight problem of battery power since the idea of the catamaran is light weight per lineal foot of hull. the power density of battery power is very poor compared to even a small amount of diesel fuel. thank you for making these videos

Thanks for the yard tour that was really cool. Are you going to reuse those mast tabernacles?

I'm really digging this story

Just subscribed thanks for sharing Can you give us a run down on how you came to own her what was the purçhase price and how long your planned refit will take approximately Thanks

....please consider an A-Frame mast with rope rigging.....think like a Polynesian.....and even the worst weather ,very little water makes on deck...

There can never be too many youtubes about Wharrams, what is the history of Ha'nu'na? :-)

Stud