Understanding Wing Technology

Me.

I have.
SHC

 

G'day Steve. That is one very AWESOME high tech 'TOY' of the highest value. Got some more pics? Played with 'the Cunninghams', Buzaglio, Red Roo-Bill Hollier, Locki, Millar, & several others - - what now seems like a 100 years ago. My personal respect for what you're about is without question - & of the greatest respect. Thanks for posting the pic. Am far to old these days (darn) but I'd sure like to try to be out there. Enjoy your speed & accomplihments & post lots & lots more pics - Please. Ciao, james

 

soft wing sail

First of all Happy New Year!

I read every post in this thread and I decided to write about my project.
I'm working on soft wing sail truly innovative, is a fully sealed double
surface capable to take an asymmetrical airfoil which range from concave
to flat lower surface independently from the tack.
The wing sail is designed to be adapted to every mast, only spreaders have
to be checked.
Through additional running rigging is possibile to modify the maximum
wing thickness and the point of maximum thickness on the chord while sailing.

The wing was patented a few years ago but I think this year will be ready
and maybe will be sold.

I attach some photos

ciao
giulio

 

=================
Very interesting, giulio and welcome to the forum! Do you have race results yet with the windsurf version of the rig?

 

the race results of our windsurf wing version are different according to each airfoil configuration.
In other words, for each wing configuration (...chord...thickness) we have different results concerning power, handling and yes,
also on AWA which is - in many cases - very close to TWA.
The handling is very different from standard sail, in fact is not necessary too much power to handle the wing.
In the above photo you can see a 100% double surface wings, for catamaran and windsurf,
but we have taken some protos with 70% to 30% double surface. With 30% D.S., the wings are
very similar (handling) to standard sail but of course the performance is better.
with concern to handling and power I can tell you this: with a 5.7sqm (grey model in the pics) you are
able to surf from 14 to 35 knots without changing anything (i.e. board, keel, and
obviously the wing).
For a complete performance analysis we are waiting for a new wing version with a brand-new outline
and a slightly larger size.

I am adding an extra photo to show you the differences from standard sail.

 

=========================
Thanks! Have you got a website?

 

yes, www.herusails.it

 

I found where you got the graphic.
It was produced using Shipflow and was published in:
"Experimental and CFD Study of Wave Resistance of High-Speed Round
Bilge Catamaran Hull Forms"
Sahoo, Prasanta, Browne, Nicholas, A. and Salos, Marcos.

It has also been used by Sahoo in some other papers.

 

G'day Gaz. C's are surely THE work of art. Thanks for the pic Steve - more please & some advise please & thanks - if you've got the time?

Question to all; Weight per total surface area of - state of the art - successful wings being used in practice? Please. Including all the standing rigging required - again Please

Steve - that's a stunningly-good wing you've developed there. I'm almost 'green' with envy.

Ciao, james

 

G'day Peter. Interested in 'C' class are you now? Why not contact Bill & Jan Hollier - Red Roo - designer/builder/skipper? That'd be a great place of much information & a wise place to start. He's living just north of you, which is a lot closer than I am - for sure. Ciao, james

 

Current C Class wings weigh more or less 150 lbs. Which is .25 lbs/ ft^2 of surface area.
The standing rigging is a few more pounds of stainless steel.
The wing in the picture was 175 lbs, built in 1995. It was trashed in the Newport event, but I have spliced the mast back together and am building new surfaces andf expect to be down in the 155 lb range when I'm done.
HC

 

This sound great! I was rooting for you before the unfortunate event. Is your repair going to make this your Plan A wing, or are you gong to continue to try to get the newer (more advanced I seem to recall) one ready for prime time.

Also, I noted what looks like a point of possible confusion, the C Class "sail area" limit is 300 ft^2, but it looks like your value was based on the area of both sides (i.e. 600 ft^2 / 150 lbs = 0.25). If you are comparing "sail area per pound" it comes out 0.5 lbs / ft^2.

 

C=Class

Hi Silver, Yes I know Bill very well. I worked with him when we were at Perry cats together. I've spoken to him about a few things. I've also spoken to Damien Smith and Lindsey Cunninghams offsider and hull designer. At the moment comes down to dollars and time. A lot to do by myself.

 

G'day P-S. Yes - a whole lot to do - for sure - - To say nothing of the mental, pohysical & emotional disipline + $100,000.00 & that's witho;ut the design time & costs. BIG, big task.

You'll want to be very commited for sure. More time than I've got to spare. I'm fairly envolved with buying a 40' x 33' x 1750 kgs x 52' wing-mast - cruising tri & going for a bit of an extended cruise/tune-up in SE Asia & then enter the Darwin to Ambon. Have great fortune with you project, Caio, james

 

Aerodynamic Lift Question I've been studying circulation recently and need a aerodynamicists comment 1) The airstreams around a foil bend the air so the change in momentum creates lift (is this right?) ie mr bernoulli can solve this part of the problem. 2) Now in the boundary layer is a thing called circulation and when it slides off the back of a foil and creates a vortex this creates lift as well. The sum total of these produces the entire lift? 3) a round tube can produce vorticy lift and flutter. Is this vorticy lift produced because the airstreams have to travel further around the votices? or is this a lift directly due to circulation? What is the physical analogue of circulation? Do I have this right or wrong? Does a crab claw sail (or spinnaker) take full advantage of circulation and neglect mr bernoulli? Any help with circulation would be appreciated. Peter S