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Messages - blackeye

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1
I need to be in east coast time or central time for work purposes.

Time zones are kind of arbitrary. Couldn't you just adjust your own habits such that you were present during the required hours?

My Ottawa based employer used to schedule 9 am meetings. Yup, 6 am Pacific, but then I was off at 2 pm.

2
The Shape Shack / Re: Ultralight Board II – SUP Foil Bumblebee
« on: December 16, 2023, 01:24:17 PM »
I don't quite understand that, but I take it as gospel.

Heh heh. Gospel, dogma, apocrypha. That's why I challenge some of this thinking. Some of it seems to be tradition as opposed to purposeful.

If Mark uses that thin layer as a disposable, he could use it as the vacuum bag. I've done that a few times as I found the thicker bag didn't conform to the curves in the particular tooling. He may have his reasons such as pinholes, dimensions available etc.

3
The Shape Shack / Re: Chinook 16" tracks
« on: December 07, 2023, 01:07:01 PM »
I like the idea of the short dual stringers and also tying in the deck to the bottom. The tubes and dowels are cool, but I think a flat U shaped channel made out of HD foam and carbon would be simpler to make and install. The length should probably be something like @dawwusup shows and make the height meet the deck.

Cut two slots in the shaping foam to install. Make a recess for the bottom plate.

Add a top plate to tie the two stringers together, forming a box overall.

Could radius the top and bottom outboard edges of the slots so that some of the cloth transitions to the deck and bottom respectively. Fill these small voids then laminate the whole board.



As we make this area stronger and stronger, something else will fail. Some boats have appendages that kick up if striking something. It is held in place by a "fuse" - a planned weak/failure point. The fuse is replaced, or even better, reset (a "breaker") and onwards you go. Ski bindings are a good comparison. Snap it back into place and continue the session.

4
The Shape Shack / Re: Ultralight Board II – SUP Foil Bumblebee
« on: December 07, 2023, 11:52:23 AM »
I'll have to give it a go. Still not convinced. Someday I will do test panels.

Theoretically, the amount of excess epoxy bleeding into the breather layer would be the same. So the difference must be that the perforated release material concentrates the bleed through at specific spots in a manner that makes it easy to recover the breather material.

Maybe the release material smooths out the epoxy a bit too, averaging it before it goes through the perforations?  Smoother transitions between wetter and drier spots?

With my method my intention was to avoid the expense and waste of another plastic layer. Breather material I have in excess. Release film I'd have to buy.

5
The Shape Shack / Re: XPS Board Building Advantages vs EPS Foam
« on: December 03, 2023, 11:42:48 AM »
I think XPS delams BECAUSE it's waterproof. <snip> Water vapor in an XPS board has nowhere to go. 


This would have to be water that is sealed in after a repair, or perhaps condensation from ambient moisture in original construction? Beasho's theory is that water intrusion will just find its way out the way it came in.

My very old very amateur very beat up paddle blade with XPS is sound. I used the coarse surface sanding method.

I'm wondering whether the resin/foam interface fails or is the failure foam/foam beneath the resin that causes the delamination experienced with XPS? I am aware of 80's boats that delaminated because the two skin layers ground down the core between them.

Also, there was discussion years ago about XPS and the mold release on its surface.

6
The Shape Shack / Re: Ultralight Board II – SUP Foil Bumblebee
« on: December 03, 2023, 11:07:37 AM »
4) ... apply the peel ply. 

5) Add perforated release, and breather layer and Vacuum


I've never understood the purpose of the perforated release layer. I've had success skipping it whereas the breather layer is vital. Is it so you can try using the peel ply again?

7
General Discussion / Re: Moving
« on: December 03, 2023, 10:45:27 AM »
Time for an update! Where did you end up?

8
The Shape Shack / Re: Jumbo Foil Mount Boxes
« on: December 21, 2021, 05:41:34 PM »
Roberts Composites posted this simple rear entry finbox

https://www.instagram.com/p/CXB3uijP5LH/

He didn't reply with answers to some  good questions though.

9
The Shape Shack / Re: Innegra question
« on: July 16, 2021, 09:33:59 AM »
It makes traditional vacuum bagging, where you trash peel ply, barrier, breather, release film, and possibly the hose to the resin trap, seem downright frugal. .... With properly table-wetted material all I need is peel ply and a bunch of paper towels for breather.

Don't forget your plastic sheet on the wet out table. A flow system for infusion replaces breather layers, although hard to say they're equivalent and therefore not really an even swap. Net addition for infusion is the re-useable spiral hose.

People are simplifying infusion as well. One system is to cut grooves in the core material to act as flow channels, and this extra surface area helps with core/fibre adhesion. This does away with most of the flow mat. Easy enough on thicker hulled sailboats, tough to do on thin cored boards admittedly. Also, peel ply would only be necessary where secondary bonding is anticipated. I know it leaves a handy surface for finishing coats, but one of its purposes is to successfully pull away the outer bagging materials, in particular the fibrous breather, and that is not as necessary with infusion.

I'm saying all this so as to not dismiss infusion out of hand. Despite that, for repairs I now use pre-wetted material and heavy sand bags in place of vacuum for clamping.

10
The Shape Shack / Re: Innegra question
« on: July 14, 2021, 04:52:43 PM »
is anyone doing resin infusion with innegra/carbon?  I would have thought that's the way to get it perfect

I'm intrigued by infusion as well, and I asked that half of the question some years ago. The reply was that the voids in the EPS will soak up resin (of course! as it should!) so that is wasted resin and useless weight. Now someone earlier mentioned sealing the foam, and if that was perfect, then one could theoretically do an infusion. The reduction in resin weight might offset the sealing material weight. I think in practice this wouldn't work at all.

It should work if you were building a composite hollow board in a mould or flat panels for subsequent secondary bonding.

11
The Shape Shack / Re: Shape 3D and beer!
« on: February 24, 2021, 01:20:17 PM »
I need a "like" button.

Are you going to show us more? Please and thanks.

12
Random / Re: YouTube Video GOES Viral - Why?
« on: February 11, 2021, 03:53:56 PM »
Wallstreetbets must have discussed your video. Time to do a stock offering!

13
Prone Foiling, Surf foiling, Pump Foiling / Re: TowBot
« on: January 27, 2021, 11:28:04 AM »
For slightly more sophisticated hull form, but still simple to execute, consider Rob Denney's "Intelligent Infusion" approach at http://harryproa.com/?p=1845



Note that his proa hulls are formed in two halves, with the seam running down the centre of the deck and bottom. You could adjust the method for conventional symmetry by making your tooling for full bottom and sides, then glue on a deck after fitting out the innards.

(PS - I want to build his EX40)

14
Random / Re: Recent Netflicks...
« on: January 22, 2021, 02:43:25 PM »
I think we saw one Icelandic/Danish drama ...we'll not be visiting anytime soon.  It looks brutal there. 

Ibsen put me off Scandinavia, but I've gone there a few times. Awesome places! I would love to spend a summer month on the west coast of Denmark. Iceland is on the list too.

Have we talked yet about Death to 2020 on Netflix? You will be amazed and laugh until you resume crying. Oh, it's Friday Jan 22, 2021? Tough coming out of a four year depression.

15
Foil SUP / Re: Personal tow in
« on: December 19, 2020, 03:03:19 PM »
https://www.instagram.com/reel/CI-7pIPKy43/?igshid=d82b1v2oaah7

So they ask "The future yes or no? 😲" I can imagine these tow-drones could also become a little mother ship. It could store drinks, food, first aid (oxygen!) and have a little waterproof garage to launch, retrieve and recharge a flying drone. A second camera station. Another garage for a nano-submersible camera drone.

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