Contact   Imprint   Advertising   Guidelines

Curved Masts and vortex generators on hydrofoils

A forum dedicated to Hydrofoil riders
james
Very Frequent Poster
Posts: 701
Joined: Sun Mar 07, 2004 2:18 pm
Kiting since: 1999
Gear: My own
Brand Affiliation: My own
Has thanked: 32 times
Been thanked: 43 times

Re: Curved Masts and vortex generators on hydrofoils

Postby james » Mon Aug 28, 2017 4:26 pm

Hydrofoil set ups to kite with existed long before the Naish 7ft sky pirate....

The notion that you think a 7ft surf board was the pinnacle of light air and upwind performance prior only to race boards does indecate some flawed ideas and testing

revhed
Very Frequent Poster
Posts: 1197
Joined: Sun Feb 24, 2008 6:15 pm
Kiting since: 1987
Local Beach: france
Gear: kites
Location: France
Has thanked: 12 times
Been thanked: 4 times

Re: Curved Masts and vortex generators on hydrofoils

Postby revhed » Thu Oct 10, 2019 8:43 am

ideas :idea:
HUMPBACK FOIL.jpg
HUMPBACK FOIL.jpg (156.55 KiB) Viewed 361 times
t effect.jpg
t effect.jpg (24.73 KiB) Viewed 361 times
winghumps.jpg
winghumps.jpg (17.15 KiB) Viewed 361 times
What-VGs-do_4.gif
What-VGs-do_4.gif (26.51 KiB) Viewed 361 times
R H

User avatar
Kamikuza
Very Frequent Poster
Posts: 6258
Joined: Fri Jan 09, 2009 4:49 am
Local Beach: Sabae Beach
Favorite Beaches: Ol' Stinky
Gear: This, that, the other
Has thanked: 68 times
Been thanked: 48 times

Re: Curved Masts and vortex generators on hydrofoils

Postby Kamikuza » Thu Oct 10, 2019 12:37 pm

revhed wrote:
Thu Oct 10, 2019 8:43 am
ideas :idea:
HUMPBACK FOIL.jpg
t effect.jpg
winghumps.jpg
What-VGs-do_4.gif
R H
How did it work?

User avatar
downunder
Very Frequent Poster
Posts: 1950
Joined: Mon Jul 01, 2013 7:16 am
Kiting since: 1970
Gear: building my own
Brand Affiliation: None
Location: Perth, Australia
Has thanked: 30 times
Been thanked: 40 times

Re: Curved Masts and vortex generators on hydrofoils

Postby downunder » Thu Oct 10, 2019 2:52 pm

Here is an idea:

- a tuna

And not a humpback whale :)

Which one is faster? ;)

User avatar
jumptheshark
Very Frequent Poster
Posts: 833
Joined: Fri Nov 10, 2017 6:36 pm
Kiting since: 0
Local Beach: Shhhhh
Favorite Beaches: Nude
Gear: The good stuff
Brand Affiliation: None
Has thanked: 82 times
Been thanked: 168 times

Re: Curved Masts and vortex generators on hydrofoils

Postby jumptheshark » Thu Oct 10, 2019 3:04 pm

SPots already made a tuna.

You might be missing the point. Not a top speed experiment, but rather a stall point one. The complete other end of the spectrum. Might also be moot as we have wings that let us stay foiling at a virtual crawl, but there is always more to learn.

Jyoder
Medium Poster
Posts: 136
Joined: Thu Jul 20, 2017 8:31 pm
Kiting since: 2016
Gear: Stringy Foil and DIY board
Brand Affiliation: None
Has thanked: 0
Been thanked: 11 times

Re: Curved Masts and vortex generators on hydrofoils

Postby Jyoder » Thu Oct 10, 2019 3:41 pm

My attempt works great. Super slow lift off speeds, good for pumping, though I am not skilled at this. However, I don’t have an equal wing without bumps to compare.
Attachments
20B81486-DEFE-4F13-812A-9EE62C92E414.jpeg

revhed
Very Frequent Poster
Posts: 1197
Joined: Sun Feb 24, 2008 6:15 pm
Kiting since: 1987
Local Beach: france
Gear: kites
Location: France
Has thanked: 12 times
Been thanked: 4 times

Re: Curved Masts and vortex generators on hydrofoils

Postby revhed » Thu Oct 10, 2019 4:17 pm

https://en.wikipedia.org/wiki/Tubercle_effect
Tunas do not have nor need, a different fish!
R H

Sfollis
Rare Poster
Posts: 14
Joined: Wed Oct 31, 2018 11:34 am
Kiting since: 2000
Local Beach: Ainsdale
Favorite Beaches: Flag beach FUE
Style: Foil board
Gear: Ozone and Moses
Brand Affiliation: None
Has thanked: 0
Been thanked: 2 times

Re: Curved Masts and vortex generators on hydrofoils

Postby Sfollis » Thu Oct 10, 2019 7:35 pm

I’m not sure I understand your goal, is it speed or stability or ??? Perhaps you can explain what problem you are trying to solve?

Sfollis
Rare Poster
Posts: 14
Joined: Wed Oct 31, 2018 11:34 am
Kiting since: 2000
Local Beach: Ainsdale
Favorite Beaches: Flag beach FUE
Style: Foil board
Gear: Ozone and Moses
Brand Affiliation: None
Has thanked: 0
Been thanked: 2 times

Re: Curved Masts and vortex generators on hydrofoils

Postby Sfollis » Thu Oct 10, 2019 7:45 pm

If I want to go slow and have loads of lift I would just use a Moses 790, if I want all round fun from 7knots to 25knots speed then I choose the 633/483 and now to get a bit of speed but maintain stability the 720/425 is what I’m using, 30knots and more will be possible with this setup and still foils raisiny at 10knots bottom end speed.

User avatar
Peter_Frank
Very Frequent Poster
Posts: 9420
Joined: Wed Oct 16, 2002 1:00 am
Kiting since: 0
Brand Affiliation: None
Location: Denmark
Has thanked: 124 times
Been thanked: 143 times

Re: Curved Masts and vortex generators on hydrofoils

Postby Peter_Frank » Thu Oct 10, 2019 9:02 pm

Sfollis wrote:
Thu Oct 10, 2019 7:35 pm
I’m not sure I understand your goal, is it speed or stability or ??? Perhaps you can explain what problem you are trying to solve?


The goal is to get the flow to attach better, meaning lower stall speed for the same area, and a lot softer stall.
Should also help to avoid ventilation crashes.

Without cost on high end, or at least not noticeable.

Thus getting a more lively wing (can be smaller for same lowend) with much better handling, should work great in waves.

8) Peter


Return to “Hydrofoil”

Who is online

Users browsing this forum: No registered users and 6 guests

cron