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 Post subject: Semi-Commercial Haka
PostPosted: Tue Aug 04, 2020 8:46 am 
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Site Rank - Deck Hand

Joined: Sun May 17, 2020 5:36 pm
Posts: 19
I have been fiddling with the idea of developing a haka for myself, but I'm happy to make more of them for you guys here. I have access to marine-grade AL, a laser cutter, press brakes, etc.

My preliminary design is made of 3/16" thickness Aluminum, held onto the boat using some "Quick Fist" clamps (thanks to someone on the FB group for pointing those out!), with a white marine-grade macropoxy finish. I'm looking into putting "Sea Dek" or similar, but depending on price I may have to pass.


I'm about to cut the prototype this week or so, and here are some specs:

- 66" Long, 12" wide
- 3/16" AL should be good to 250 lbs in the center, 1/8" could save some weight but may be flexier. Will protoype 1 of each probably.
- Weight: 16ish lbs a piece, comparable to rotomolded backboards

Cost will end up being around $100-250 depending on sea dek pricing and so on. Hoping to keep it towards the lower end of that range, but I have to have some margin in there in order for my boss to approve me making more than a couple. I don't run the place yet!

Any thoughts? I also have a rotomolding machine, but we'd be looking at $10k in tooling just to get it started, which I don't think is in the cards...

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 Post subject: Re: Semi-Commercial Haka
PostPosted: Tue Aug 04, 2020 12:27 pm 
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Joined: Sun May 17, 2020 5:36 pm
Posts: 19
Well, did a bit of testing on the slot/bend interaction. I've decided 1/8" is gonna be the way to go, with potentially 1/2" SCH 40 piping in the corners, both to help make the thing more comfortable to carry, but also to add a bit of rigidity. Weight should be down near 11.5lbs at 1/8" thickness, 14.5lbs with the pipe.

I also increased the overall width by 1.75" and the slot widths by .375, since they scraped my knuckles a bit when handling it. The "final product" will be TIG welded, not MIG like this. Just used MIG cause i came across a bored MIG welder before i found a bored TIG guy.


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 Post subject: Re: Semi-Commercial Haka
PostPosted: Tue Aug 04, 2020 2:34 pm 
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Joined: Thu Aug 16, 2007 2:25 pm
Posts: 2817
Location: Central Coast NSW Australia
Nice work TCF! 8)
I’m looking forward to seeing what you come up with.
I built 3 versions of haka over the 12 years or so I had Islands. If these are for a TI consider a length of 2m (around 79”) as the sweet spot for soloing the TI is sitting opposite the rear footwell. That cantilever also makes it easy going from the rear seat to the haka and back.


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 Post subject: Re: Semi-Commercial Haka
PostPosted: Wed Aug 05, 2020 6:51 am 
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Joined: Sun May 17, 2020 5:36 pm
Posts: 19
They are for the AI, overall length of 66"

I don't think the "quick fists" will support sitting cantilevered behind the akas. They are really just to keep the thing from sliding around, since they only support 25 lbs each. There are heavier duty ones that support a lot more weights, but at 79" long, the AL would have to be 3/16" or even 1/4" thickness to have good rigidity.

I have redesigned it a little bit: Widening the slots as well as adding in the pipe rails. First prototype should be cut and bent in the next couple weeks. New screenshot:

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 Post subject: Re: Semi-Commercial Haka
PostPosted: Wed Aug 05, 2020 4:00 pm 
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Joined: Tue May 27, 2003 12:44 pm
Posts: 13672
Location: Oceanside, California
Our engineers have been toying with a Haka bench. Has to reduce in size for shipping or will not work for us.

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Hobie Cat USA


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 Post subject: Re: Semi-Commercial Haka
PostPosted: Wed Aug 05, 2020 4:12 pm 
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Joined: Sun May 17, 2020 5:36 pm
Posts: 19
Whats the size goal? I can see splitting it in half and using a piano hinge or similar.

I've been thinking about that a bit, since we have hatchbacks, so space is at a premium when we take the boats places. But these should fit on the trailer pretty easily between the boats.

I've also been thinking about table legs for them as well.

Going to have the first prototype next week sometime, so I'll keep this thread up to date.

The nice folks at Marine Mats are working with me too, so hopefully the final version will have nice custom cut foam padding on it too.


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 Post subject: Re: Semi-Commercial Haka
PostPosted: Wed Aug 05, 2020 4:25 pm 
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Site Rank - Deck Hand

Joined: Tue May 30, 2017 1:25 pm
Posts: 16
Made some out of White Kiln Dried Pine (lite weight) years ago and spar varnished them, they work really well but they are still too heavy. So I'm all in if ya'll can come up with something strong and light weight for a TI.

Cheers

Nick


Last edited by NickW on Thu Aug 06, 2020 12:23 pm, edited 1 time in total.

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 Post subject: Re: Semi-Commercial Haka
PostPosted: Wed Aug 05, 2020 5:51 pm 
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Joined: Tue May 27, 2003 12:44 pm
Posts: 13672
Location: Oceanside, California
I'll have to ask shipping. Needs to fit FedEx and hopefully not too much over sized. The costs go up quickly.

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Matt Miller
Director of Parts and Accessory Sales
Warranty and Technical Support
Hobie Cat USA


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 Post subject: Re: Semi-Commercial Haka
PostPosted: Wed Aug 05, 2020 6:25 pm 
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Joined: Sun May 17, 2020 5:36 pm
Posts: 19
Well, let me know what the criteria are. I'm happy to take some of that into account on this design. Maybe you can get them to send me a new AI and TI for testing, eh? :mrgreen:


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 Post subject: Re: Semi-Commercial Haka
PostPosted: Thu Aug 06, 2020 8:47 am 
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Joined: Tue May 27, 2003 12:44 pm
Posts: 13672
Location: Oceanside, California
;)

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Matt Miller
Director of Parts and Accessory Sales
Warranty and Technical Support
Hobie Cat USA


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