Northwest Kiteboarding
Forum | Classifieds | Lost & Found | CGKA | Industry | Sensors | Forecast | Spots | Seattle | Decals | RSS | Facebook

Events | Photos | Search | Register | Profile | Log in to check your messages | Log in 

Foiling question for all you Hydrology engineers

 
Post new topic   Reply to topic    Northwest Kiteboarding -> Gorge / Portland / Oregon Coast
previous topic :: next topic  
Author Message
moondog

Since 15 Aug 2007
697 Posts
white salmon
Addicted

CGKA Member


PostFri Sep 06, 19 5:46 pm    Foiling question for all you Hydrology engineers Reply with quote

In the good old days I would search out the undisturbed butter water on wave faces and behind the barges on my surf board. Now on my 633 foil when I hit these same surfaces I get this weird burble like the wing can't grab on to anything. It seems to me that foils prefer disturbed water. After 40 years as a pilot disturbed air meant turbulence. Our wings didn't like disturbed air. These hydro wings seem to prefer disturbed water! Any theories!
_________________
moondog

View user's profile Send private message Send e-mail
eric

Since 13 Jan 2006
1803 Posts

XTreme Poster



PostFri Sep 06, 19 6:28 pm     Reply with quote

The water behind a prop is heavily disturbed.

View user's profile Send private message
moondog

Since 15 Aug 2007
697 Posts
white salmon
Addicted

CGKA Member


PostFri Sep 06, 19 6:44 pm     Reply with quote

The water behind the barge is disturbed probably 5-8 feet below the surface, but we are on the glassy section and my wing is buffeting like it wants to stall. As soon as I leave the glass everything returns to normal.
_________________
moondog

View user's profile Send private message Send e-mail
kassak

Since 18 May 2010
107 Posts

Stoked



PostFri Sep 06, 19 8:38 pm     Reply with quote

My thoughts:
If you foil behind a boat you will also find that while the direct area in the prop wash is rough it’s rideable because the turbulence while high is random with respect to directionality. The area outer towards the wake is very inconsistent in ability to ride I believe owing to turbulence which has a consistent rotation and directionality which while not itself super stable in its presence is otherwise consistent with respects to its other attributes. It’s likely someone who knows their fluid dynamics is reading and thinking of a polite way to tell me I have no clue...

Steve

View user's profile Send private message
bwd

Since 04 Aug 2007
385 Posts

Obsessed



PostFri Sep 20, 19 5:46 pm     Reply with quote

In surf dude terms i think the issue is the types of vortices you can see in underwater surf video shots where it looks like parallel ropes climbing up the wave face that end up dissolving into boils of white water ws the wave breaks.
These make stripes of up- and downgoing water just below the surface. A foil passing successively through these is going to feel it.

View user's profile Send private message
Post new topic   Reply to topic    Northwest Kiteboarding -> Gorge / Portland / Oregon Coast All times are GMT - 8 Hours
Page 1 of 1

 
Jump to:  
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum
You can attach files in this forum
You can download files in this forum