Messages

16

Foil SUP / Re: Ghetto Foil

« on: November 09, 2018, 12:33:13 AM »

Oh no the ghetto foil is no longer the world's shortest board
Kai's new whip is a 2'8"

17

Foil SUP / Re: Cowboy Foil Experiment Thread

« on: November 06, 2018, 11:37:02 PM »

That looks heaps better scb

I think the only reason the fuz wing join on naish and neilpryde can afford to be so small is of how they are molded and basically locked together
My first wing join was 60mm wide and it worked plenty good for a bit until I really started to turn it but it was probably a combination of things really.
with that amount of carbon it should fly sweet as

18

Foil SUP / Re: Diy foil nz

« on: November 05, 2018, 09:26:51 PM »

Got quite a bit done since last post.
I made a new stab, this one has a bit more area just interested to see how that affects things.
Coated everything in durepox and started sanding today but its still a tad gummy. (the lighter colour is what it looks like sanded)
Also ive got a 4'7" prone board hacked up from another board going on in the background.

19

Foil SUP / Re: Diy foil nz

« on: October 29, 2018, 01:29:14 AM »

After I posted I thought of laminating a few thinner layers. Hit send too soon.

Those don’t look 40mm (1.5” for US) thick in the pics. That’s thicker than I thought from looking at it.

Yes, I have a wood core in my fuse so the inserts will be seated (epoxied into) wood. After pulling it out of the bag tonight I’m thinking of adding a slightly bigger plate like you have under the fuse. I feel like I have the fuse sorted now but I’m concerned that I could break my wing if I don’t reinforce it due to the lateral forces if the bolts are only 30-40mm apart. Even 10-15mm on each side would give way better leverage.

Yeah I've found that getting the connection between the front wing and your feet as stiff as possible is very handy when it comes to turning or even controlling it, the original fuz wing connection I had was fine for my little wing but the bit one yanks a bit harder on the mast and you can definitely feel it. Can you upload some picutres of your fuz to wing connection I need to get my head round it.

Yeah my wing is definitely 40mm at it's thickest point, I am starting to wonder about using fusion to model because it seems like the shape tapers off very quickly and becomes thinner much quicker than youd think, from looking at other foil brands they don't tend to do this. Maybe it's just the wing outline causing it or maybe designers using multiple stations with profiles that get thicker further down the wing but I'll do some more research into it first.

20

Foil SUP / Re: Diy foil nz

« on: October 28, 2018, 11:57:21 AM »

This is looking great.

I finally got mine back in the bag and fixed the front of my fuse.

I like your wider wing mount. Mine is top mounted too now but only a couple of inches wide. I’m concerned about the stress on my foam and glass wing. Going to beef it up but I’ve got about the same mount size as the Armstrong wings so hoping it’s solid enough. Probably need to build a plywood wing next actually.

Container, how did you get the bend in yours, did you put relief cuts in the bottom and then fill them? Also, how thick are y’all’s wings?

Final question. I’m looking for stainless threaded inserts. Should I use helicoils instead? Which do you think is stronger? I just figured the screw in threaded inserts were the best I could do for mounting in wood.

This new wing is a NACA 4416 so at 250mm chord thats 40mm thick.
If you are threading into solid glass or carbon I would go with helicoils but it sounds like threaded inserts might be better for wood.

Container might have laminated several layers of a smaller thickness across his mold but I'm not totally sure, relief cuts don't really make any sense for strength.

21

Foil SUP / Re: Diy foil nz

« on: October 27, 2018, 11:54:47 AM »

A few mods over the past couple weeks.
I routed down the wing where the fuz attaches so it doesn't protrude and the fuz is now recessed into and sits nice and flush, way less drag.
Also layed some reinforcement around the mast attachment on the fuz as I can still feel the new wing trying to tear itself free when turning, this should make it super solid and stable.

Next plans are to bog everything up and get a coat of durapox on it because epoxy isn't the best when it comes to drag.

22

Foil SUP / Re: Two wings better than one... Bi-wings anyone???

« on: October 10, 2018, 11:44:05 PM »

Saw this on the seabreeze forum

23

Foil SUP / Re: Diy foil nz

« on: October 10, 2018, 11:28:04 PM »

did you end up trying the new wing? looks mint! whats the span? and did you vacuum the glass plate for tapping into, im going to do a similar sort of thing on my one but i thought maybe resin rich would be better for tapping.

got my new super downwind flyer ready for glassing, 1100mm span

Yeah I had a go on the new one, didn't do so good in the surf but I'm gonna give it another go because it was shin height lol. Towing behind the boat it went sweet. Started lifting at 5 knots and flew best around 10. I think im gonna play around with stabilisers because Im not sure about this one.

Its 900mm span with 250mm chord. That wing looks mean, keen to see how slow it flies. Whats the chord on it?

The glass is plate dad had laying around from a job a few years ago, Im pretty sure its vacuumed but it works sweet for threading, I use helicoils instead of just straight threads.

24

Foil SUP / Re: Diy foil nz

« on: September 28, 2018, 02:50:58 AM »

Glued in the glass plate for the bolts to be countersunk into on the wing and glued a plate to the fuz to allow bolt mounting further outboard on the wings.
Didn't have enough time but will reinforce that new fuz wing mount with a whole lot of carbon and glass.
Trailing edge is now glassed and I sanded that up today and put a coat of resin over the whole thing as a temporary waterproofing for this weekends use.
Should be fine for testing but needs a whole filler coat and sand to make it fair.

25

Foil SUP / Re: Diy foil nz

« on: September 26, 2018, 05:19:26 PM »

As far as mast twist and flex.  6 layers of 3K carbon twill layed 45 dgrees and 90 degrees would fix it.  Vacuum bagging helps but is not necessary.

Yeah I'm probably going to have to do something like this for the new wing with all the torque acting for the size of the wing. Or just build a new one lol

I would done something like this but we only have carbon unis at home and don't have any cloth. Two of the carbon uni layers are laid at an angle that runs from the top back corner to the bottom front corner and opposite for the other layer so hopefully that does something similar.

26

Foil SUP / Re: Diy foil nz

« on: September 25, 2018, 01:11:14 AM »

A bit more work done this afternoon. Rebates filled with carbon unis then bogged, glassing the trailing edge tomorrow.

Also planned to remake the wing mount into something that can handle this huge new wing. 

27

Foil SUP / Re: Diy foil nz

« on: September 25, 2018, 01:09:21 AM »

That new wing is sweet man.

I need a bit of assistance with my 3D design actually.

I have hopes for my fuse and mast now that they are redone as well. What angle did you end up at for your rear wing? (I’ve been using the “level” app on my phone to get close enough measurements). I’d love to know that before my next test.

The plywood CNC method oks to be the fastest one yet. But, have you considered cutting it out of dense foam? Seems like that would work with a CNC too, no?

Thanks man

Are you using fusion 360 for design, Ive spent the past 4 years using it so could probably help you out

Ive got no accurate way to measure between the trailing edge so Ill draw it up in CAD and get back to you on the angle. (Edit: Its about 1 degree give or take a bit)
New wing is going to be at 1.5 degress, this sound about right for AOA?

Cutting out of dense foam would just mean more reinforcement in the form of carbon or glass. The cnc takes away the hassle of doing a shit load of laminating and gives you and almost perfect object straight off the machine so needing to spend hours laminating over top would be beside the point for me. Yeah foam would be wayy lighter and probably better for foiling but for prototyping I'd rather have a heavy foil and make a new one based on the testing that works better in the same time as making a single foil that might not work for what I need it to.

28

Foil SUP / Re: Diy foil nz

« on: September 25, 2018, 01:02:31 AM »

Nicely done Kiwi! That is an impressive wing design.
I like it when a good CNC setup and good plywood turn out like what you have done, with the layers of wood showing the curves in the work.

Thanks JR

Very satisfying to sand the machining marks off and see the perfect layers of ply 

29

Foil SUP / Re: Diy foil nz

« on: September 24, 2018, 02:09:03 AM »

A week from design to real world object. Pretty happy with it. Cut in 3 parts and glued together. The rebates near the tips are for carbon unis to strengthen the wing to tip joins.

Gonna be a big week, I really want to get it done for the holidays (5 days lol).

30

Foil SUP / Re: Cowboy Foil Experiment Thread

« on: September 09, 2018, 08:42:12 PM »

Im pretty sure AOA is based on chord line and not the bottom surface of the foil.

The tool in this video is creating a surface parallel to the chord to measure AOA off.