Contact   Imprint   Advertising   Guidelines

the aspect ratio mystery

A forum dedicated to Hydrofoil riders
PrfctChaos
Frequent Poster
Posts: 240
Joined: Fri Apr 27, 2018 6:16 am
Local Beach: Perth
Style: Wave
Gear: Peak4's, Chrono V3, Skimboards, foils
Brand Affiliation: None
Has thanked: 26 times
Been thanked: 57 times

Re: the aspect ratio mystery

Postby PrfctChaos » Mon Sep 07, 2020 1:38 am

Peter_Frank wrote:
Sun Sep 06, 2020 8:27 am

Aspect ratio is only one out of a huge number of factors.

Fuselage length, stab size, stab tips and di/anhedral, position of mast to wing, wing area, wing dihedral, wing sweep, wing taper, wing camber line, wing thickness, wing LE diameter, wing washout, wing profile change towards the tips, and the list could go on and on.
But keeping all else the same and JUST increasing the aspect ratio is going to make it less willing to initiate the turn. That is the point.

And most of the high aspecs wings on the market at the moment are pretty flat (not much dihedral). Likely because the manufacturers are trying to minimise area and drag. It should be remembered that the main testing for the high aspect wings come from downwind SUP racing (Gofoil, Axis, Takuma), where they care about speed, low drag and not at all about turning ability.

User avatar
tegirinenashi
Very Frequent Poster
Posts: 735
Joined: Wed Aug 27, 2014 3:29 am
Local Beach: 3rd Ave
Gear: Bates 4000, Dominator MX-10
Brand Affiliation: None
Has thanked: 18 times
Been thanked: 15 times

Re: the aspect ratio mystery

Postby tegirinenashi » Mon Sep 07, 2020 2:18 am

There is nothing in the fancily shaped wing that makes it superior to flat wing. It might offset the center of the lift, perhaps, one centimetre, that's it. At the expense of increased drag. Arguably, adding that centimetre to the mast is much more efficient solution. The honest reason for curvy wing existence is that they look more "sophisticated", which warrants higher price. In couple years they will follow the "birdy" Naish kites -- to oblivion.

User avatar
jakemoore
Very Frequent Poster
Posts: 2131
Joined: Tue Jan 20, 2004 3:59 am
Gear: Foil and 1strut kites.
Brand Affiliation: None
Location: Oleander
Has thanked: 74 times
Been thanked: 158 times
Contact:

Re: the aspect ratio mystery

Postby jakemoore » Mon Sep 07, 2020 4:08 am

tegirinenashi wrote:
Mon Sep 07, 2020 2:18 am
There is nothing in the fancily shaped wing that makes it superior to flat wing. ... In couple years they will follow the "birdy" Naish kites -- to oblivion.
Time will tell. I think it does something to keep the whole wing from ventilating at the same time.
7C34A6F2-C980-4233-9719-620355FA06F0.png
2C20D7E8-85C9-49DB-B028-64BBB33DCE0C.png
Wing is Ketos Kool 1200 which has a small gull wing anhedral Wave XL is a little deeper and IMO a little more forgiving to ventilate the top surface.

joriws
Very Frequent Poster
Posts: 1067
Joined: Wed Nov 24, 2010 11:03 am
Gear: Flysurfer, HQ, Moses, Nobile, North, Ozone
Brand Affiliation: None
Has thanked: 50 times
Been thanked: 92 times

Re: the aspect ratio mystery

Postby joriws » Mon Sep 07, 2020 10:59 am

Here is a lot of information on foil design by Mr. Gong.. AR, foil thickness, thickness location from LE, chord, stabilizator, hull, distances, carving etc..

https://www.gong-galaxy.com/en/magazine ... oil-range/

TomW
Very Frequent Poster
Posts: 3578
Joined: Wed Oct 05, 2005 6:43 pm
Kiting since: 2001
Local Beach: Vejbystrand, Lomma
Gear: TW Surfboards hydrofoil board 110
Gong Veloce M, 100cm carbon mast
Ozone Hyperlink V1 7m
Hyperlink V2 9m, 13m
Concept Air Wave 4,5m
Brand Affiliation: None
Location: Sweden
Has thanked: 53 times
Been thanked: 185 times

Re: the aspect ratio mystery

Postby TomW » Wed Sep 09, 2020 8:44 pm

Basically its really complicated and interdependent.
If you are in first 2 years, just get a 1200cm2 foil and learn to fly all the time. Once you have 200 hours flying, you start geeking out and try something else, bigger or smaller and you'll feel the difference.
Personally, I dislike skatey feeling, i like my wing and stab to grip. But look at Stefano, that dude rips on a skatey foil. Carving vs slashing
These users thanked the author TomW for the post (total 2):
nixmatters (Thu Sep 10, 2020 5:59 am) • juandesooka (Thu Sep 10, 2020 5:50 pm)
Rating: 13.33%

nixmatters
Frequent Poster
Posts: 447
Joined: Sun Jun 12, 2016 12:38 pm
Kiting since: 2009
Style: freeride. started foiling, not there yet
Gear: mostly custom made
Brand Affiliation: None currently
Has thanked: 167 times
Been thanked: 98 times

Re: the aspect ratio mystery

Postby nixmatters » Thu Sep 10, 2020 6:06 am

papasmerf wrote:
Sat Sep 05, 2020 11:38 pm
can't figure it out.
By far the best answer to all your concerns: :wink:
TomW wrote:
Wed Sep 09, 2020 8:44 pm
Basically its really complicated and interdependent.
If you are in first 2 years, just get a 1200cm2 foil and learn to fly all the time. Once you have 200 hours flying, you start geeking out and try something else, bigger or smaller and you'll feel the difference.
Personally, I dislike skatey feeling, i like my wing and stab to grip. But look at Stefano, that dude rips on a skatey foil. Carving vs slashing


Return to “Hydrofoil”

Who is online

Users browsing this forum: No registered users and 15 guests