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Introducing the Hoff - a transparent acrylic board

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shawn13
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Re: Introducing the Hoff - a transparent acrylic board

Postby shawn13 » Sat Mar 21, 2015 1:53 pm

Awesome! Do you have any helmet cam shots so we can see what it looks like while riding?

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Re: Introducing the Hoff - a transparent acrylic board

Postby revhed » Sat Mar 21, 2015 2:28 pm

I have always wanted to be able to look down and thru a board to see the flying hydrofoil working, maybe using this but in "X" reinforcement design will be the solutition?
R H

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Re: Introducing the Hoff - a transparent acrylic board

Postby droffats » Sun Mar 22, 2015 2:22 am

Now that is a cool idea -- an acrylic hydrofoil deck. The feeling of flying would be even greater. Even more like a hoverboard. I wonder how to make the connection to the mast strong enough. And then make the deck strong enough.... Looking at all the work making the Hoff, I'm afraid to even try...

- Droffats

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Re: Introducing the Hoff - a transparent acrylic board

Postby Johnny Rotten » Sun Mar 22, 2015 3:35 am

was always fascinated by your video of your first iteration, Gone back to this post more than once to check the water flow..... been dying to see you really load and pop that bad boy, curious to see what the waters doing.......post more vid please

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Re: Introducing the Hoff - a transparent acrylic board

Postby rynhardt » Sun Mar 22, 2015 7:48 pm

I'll get some video next time out. Was hoping to have another session this weekend but got skunked by bad weather.

On the plus side I've got my first order in and am halfway done with the next board. :thumb:
Now that I've got my process sorted I reckon it takes around 10 hours to do a complete board.

It would be cool to extend the idea to a foilboard. I think you would need a beam in the centre of the board to attach the mast to and certainly a different rocker profile.

A cheap proof of concept would be to attach a polycarb sheet to three 2x4 wood beams and attach the mast to that.. :idea:

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Re: Introducing the Hoff - a transparent acrylic board

Postby rynhardt » Sun Mar 22, 2015 9:34 pm

Did a quick mock-up in Blender of what a possible foil board might look like..

Got a bit of a trimaran flavour to it. Especially if one were to put the edge beams below the board instead of above.
Attachments
hoff foil2.png
hoff foil1.png

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shawn13
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Re: Introducing the Hoff - a transparent acrylic board

Postby shawn13 » Mon Mar 23, 2015 4:39 pm

rynhardt wrote:On the plus side I've got my first order in and am halfway done with the next board. :thumb:
Now that I've got my process sorted I reckon it takes around 10 hours to do a complete board
Are you selling these? How much?

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rynhardt
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Re: Introducing the Hoff - a transparent acrylic board

Postby rynhardt » Tue Mar 24, 2015 9:35 am

The short answer is not yet. The next board is promised to a friend.

Also, I'm one guy doing this part time and realistically I can finish one board every 2 weeks with my current setup.

In case you're wondering where the 10 hours comes from:

Per beam (and there are 2 beams):
Half hour to prep the mould and pour the foam core. Cure overnight.
Half hour to sand off the core skin and edges.
Half hour to prep the mould and cut the fabric.
Two hours to do the wet layup. Cure overnight.
Half hour to prep the oven. High temp cure overnight.
Half hour to release and trim the beam.

And then:
Half hour bonding the beams to the sheet. Cure for 2 days.
Half hour trimming the polycarb sheet.

What I'll do is as a finished board becomes available I'll see if anyone is interested in doing some product testing.
In which case I can sell the board at cost but there are no guarantees.

It currently costs about $200 in material to produce a board.

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Re: Introducing the Hoff - a transparent acrylic board

Postby sijandy » Wed Mar 25, 2015 8:16 am

rynhardt wrote:First wet run yesterday at the cable park. The board performed well and nothing broke :thumb:

Thanks to my buddy Dave for some excellent work behind the lens!
How'd you fix the inserts in for the bindings into the polycarb? Looks the shit with those raphs bolted on! :thumb:

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rynhardt
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Re: Introducing the Hoff - a transparent acrylic board

Postby rynhardt » Wed Mar 25, 2015 9:44 pm

I have literally spent nights lying awake thinking how best to attach the bindings.
In the end I decided to simply drill a hole through the polycarb and put a bolt through.

The first board I did the same thing, and it was pretty robust. Then I recessed the bolt head and somewhat unsurprisingly the board cracked at the bolt hole the very next session.

From what I know about polycarb and acrylic's properties, they are both considered notch-sensitive materials. I don't know if an insert will cause a crack but I suspect so. In any case the sheet is only 5mm thick and doesn't allow much room for an insert to anchor.

Wiping out with bindings can put a tremendous amount of force through the board. Something like a faceplant at 20mph is enough to bruise my ankles (and face :o ) and rip the laminate loose from the base sheet. I wanted this board to be able to withstand that level of punishment.

In any case, the bolts I use are wide flat head stainless steel M6 bolts. I grind the heads down to 1mm to minimise drag as much as possible.
I'm sure the bolt heads cause some drag. But I can live with it.
Attachments
bolted.JPG
bolt head on underside of board
ground.JPG
The ground down bolt vs the original bolt.


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