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by BWD
Thu Nov 30, 2017 8:45 pm
Forum: Hydrofoil
Topic: America's Cup 2021, the hydrofoil AC75
Replies: 34
Views: 1738

Re: America's Cup 2021, the hydrofoil AC75

@gbrunga: that's great! A friend of my family owned intrepid for a time and I saw her at the dock but did not sail (it was a cold winter visit)... @mossy: I think it was the cyclors and the control system/duty assignments that nailed USA. Spithill was trying to do the job of 2-3 Kiwis, and every ove...
by BWD
Thu Nov 30, 2017 8:12 pm
Forum: Hydrofoil
Topic: Kai Lenny's new foil
Replies: 11
Views: 2206

Re: Kai Lenny's new foil

Looks pretty similar to spotz to me. Sounds reasonable as a starting point. Riders/researchers do tend to try to isolate variables to evaluate changes in tuning and developing new gear, so if Kai has a decent amount of time on a given mast/fuselage/stab, why not use as a platform to develop new fron...
by BWD
Thu Nov 30, 2017 3:09 am
Forum: Hydrofoil Builders
Topic: Effect of Different Epoxies
Replies: 21
Views: 4271

Re: Effect of Different Epoxies

Guys, I’m out.
Do some learning.
You’ll be glad you did.
by BWD
Wed Nov 29, 2017 10:26 pm
Forum: Hydrofoil Builders
Topic: Effect of Different Epoxies
Replies: 21
Views: 4271

Re: Effect of Different Epoxies

And what's the safety factor in your engineering value for the carbon? I wouldn't design to 150 GPa.... And how much safety factor do you need for the resin (less, since it depends on micro to molecular scale interactions, instead of meter long fibers and many process steps)? If you mix the resin we...
by BWD
Wed Nov 29, 2017 2:59 pm
Forum: Hydrofoil Builders
Topic: Effect of Different Epoxies
Replies: 21
Views: 4271

Re: Effect of Different Epoxies

If your layup design does not cater for strain in a certain direction, then the resin's strength will come into play. the resin's strength is always in play. imagine using sikaflex instead of epoxy. That stuff sticks quite well, you would never get it off the fibers, but you couldn't make a mast of...
by BWD
Wed Nov 29, 2017 4:42 am
Forum: Hydrofoil Builders
Topic: Effect of Different Epoxies
Replies: 21
Views: 4271

Re: Effect of Different Epoxies

To break, your carbon mast (or fuse or wing) has to bend. The resin helps keep it from bending, by keeping fibers from moving relative to each other. So with flexy resin you give up some strength and resistance to bending. A little too much bending and the carbon breaks. Stiffer resin keeps the part...
by BWD
Tue Nov 28, 2017 8:31 pm
Forum: Hydrofoil Builders
Topic: Effect of Different Epoxies
Replies: 21
Views: 4271

Re: Effect of Different Epoxies

I think if building a foil, it's probably worth it to go for an epoxy with a little more stiffness, and take the trouble to postcure it. For a board to be 10% stiffer, it's easier and cheaper to add a stringer or make it a few mm thicker, but for a foil, you are probably not going to want it 17mm th...
by BWD
Mon Nov 27, 2017 5:37 pm
Forum: Kiteracer
Topic: Southeastern Virginia Hydrofoil Regatta! Any interest?
Replies: 2
Views: 116

Re: Southeastern Virginia Hydrofoil Regatta! Any interest?

add a pursuit/rally event for us slower/newer types, great idea!
by BWD
Sat Nov 25, 2017 6:20 pm
Forum: Kitesurfing
Topic: Stainless steel pins used in leash quick release
Replies: 72
Views: 6541

Re: Stainless steel pins used in leash quick release

Filling tube with putty will cause crevice corrosion and eventually part failure. Having used one of these swage eye setups for 30+ sessions over a year, 7-30 knots, I see no signs of deformation.
by BWD
Sun Nov 19, 2017 4:19 pm
Forum: Kitesurfing
Topic: Channels on a surfboards
Replies: 24
Views: 1397

Re: Channels on a surfboards

Since it seems like there is some grasping and gasping here, some hints: All strakes, keels, concaves and channels contribute to lateral and directional stability by creating force in proportion to their angle to the water flow. For lifting strakes on vee bottom boats, this means they increase lift ...

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