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by zfennell
Wed Jan 28, 2015 3:42 pm
Forum: Hydrofoil
Topic: matrix surface
Replies: 13
Views: 2071

Re: matrix surface

? on top: I can see there was no peel ply on the top surface additionally there was no breather on top, so no need for peel ply. on the bottom: between the glass plate and the wing, breather is visible. peel ply or perforated film would be needed here, if only to keep the breather from getting bonde...
by zfennell
Tue Jan 27, 2015 6:30 pm
Forum: Gear Builders
Topic: skin thickness
Replies: 17
Views: 3913

Re: skin thickness

I've got to say that stan's advice is always sound and time tested from his own experience. So weigh your options carefully while you consider other approaches. That said, the use of Soric infusion core sounds very appealing based on the description from the manufacturer. dual use of core and flow m...
by zfennell
Mon Jan 26, 2015 8:23 pm
Forum: Hydrofoil
Topic: matrix surface
Replies: 13
Views: 2071

Re: matrix surface

structurally, I think it looks pretty nice cosmetically and hydrodynamically, I can see where you would be disappointed with the print-thru. perhaps - less total vac (what is the vacuum pressure btw ?) - slightly stiffer bag material. - film could be cut to size, so it does not need to drape around ...
by zfennell
Sat Jan 24, 2015 5:22 pm
Forum: Gear Builders
Topic: skin thickness
Replies: 17
Views: 3913

Re: skin thickness

hi pedro, your drafting skills are pretty good. the appropriate skin thickness for your 'boat' will likely have a lot to do with the fabrication technique you choose. the comparison to kayaks may be a good application considering the relatively flat panels and hard chines shown in your drawing. a qu...
by zfennell
Tue Jan 20, 2015 7:43 pm
Forum: Hydrofoil
Topic: carafino
Replies: 32
Views: 7197

Re: carafino

I don't believe you are who you haven't said you are. I think you're Carafino. Or someone close to him. crazy mofo face to face? sure thing buddy. I guess its possible. But Keoni sounds more like Arcsrule did during his early dealings with Mango. I'm sure he needed to defend his purchase decision i...
by zfennell
Wed Jan 14, 2015 1:17 pm
Forum: Hydrofoil
Topic: kite vs windsurf setup
Replies: 17
Views: 2522

Re: kite vs windsurf setup

soory i think i expressed myself poorly. what i meant is to build a kitefoilboard with compartment somewhere in between a kitefoilboard and a windsurf board that way you can bennefit from both world. any ideas ? do you guys think a 20 cms thick board is too much? volumen would be around 200-210 lit...
by zfennell
Tue Jan 13, 2015 3:05 pm
Forum: Hydrofoil
Topic: kite vs windsurf setup
Replies: 17
Views: 2522

Re: kite vs winssurf setup

the sail is positioned to place the center of effort in the same place as the kite....balanced at your harness hook. raking the mast provides fore-aft control of the center of effort. raking the sail to windward compensates for heeling forces wind drag is reduced by keeping the foot of the sail clos...
by zfennell
Sun Jan 11, 2015 2:14 pm
Forum: Hydrofoil
Topic: Painting foils
Replies: 8
Views: 2326

Re: Painting foils

All true.
Just not as sexy looking.
....marketing and cosmetics
by zfennell
Thu Jan 08, 2015 7:04 pm
Forum: Hydrofoil
Topic: Polish hydrofoil wings?
Replies: 19
Views: 3878

Re: Polish hydrofoil wings?

just 'clean living', I guess But, I am curious about which "ideas" you have for testing. Do you want to reduce drag on the strut or foil or both? Do you want to reduce turbulent bl drag or increase the amount of laminar BL? Laminar BL (as peter has mentioned ) may not be easy. But foils are a legit ...
by zfennell
Thu Jan 08, 2015 5:16 pm
Forum: Hydrofoil
Topic: Polish hydrofoil wings?
Replies: 19
Views: 3878

Re: Polish hydrofoil wings?

Edge, if you were to test different groove parameters you may wish to do a google ( or technical library) search for various experiments related to: "turbulent boundary layer skin friction reduction" "riblets". or "micro-grooves" the effect is measurable but not dramatic. I believe its only benefici...

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