Canard Foil

[Starsky]

I guess they will have to pay these guys royalties.

http://crazyfoil.com

Their french.... but not from France.

[Europ2]

I guess they will have to pay these guys royalties.
http://crazyfoil.com
Their french.... but not from France.

They are not very far from you Starsky
Since the publication of this post it seems that the site product description has evolved and this canard Hydrofoil can now be used with a kite as well.

I would never have thought that this could be patentable ... mainly because of the hydrofoil canard for sport board designed by Franckite24 (Sword 1 father) and posted on the French Kitefoil forum end of 2011 /early 2012
https://translate.google.com/translate? ... edit-text=

CrazyFoil canard patent.jpg (5.34 KiB) Viewed 1803 times

The canard hydrofoil later evolved to the following prototype by Renaud-M

[ronnie]

Rumours of one that flies well are being heard here in THE country of KBHF innovation.
Maybe? more info after this weekend test days.
R H

Is that related to 1st April?

Its difficult to tell if the experiments with Canard foils in the past were guesswork or they had a theory that might work.

I've outlined my guess at a line of research which could largely be done on a computer to check if wings could be made, where the rear wing smoothly produces a higher % of the total lift as the angle of attack increases, thereby keeping the centre of lift under the centre of mass.
If the computer model showed potential, then a prototype could be made to find out if it actually worked in real conditions.

[revhed]

There will be no patents, royalties for either a TT or canard design KBHF as prior art can be proven with ease.
Unfortunately the latest canard design that is flying well was not on display at the French KBHF test days, but it will be seen and flown very soon.
R H

[ronnie]

dsc00813.jpg

There will be no patents, royalties for either a TT or canard design KBHF as prior art can be proven with ease.
Unfortunately the latest canard design that is flying well was not on display at the French KBHF test days, but it will be seen and flown very soon.
R H

Interesting!

Now it has been shown that the Canard can work, the next stage is to develop it to see if it can be more efficient, or maybe work better in some applications, than the current popular configuration.

I'm glad to see the Canard design being investigated. We need to see it developed to see what it's full potential is - just in case it works better than the usual configuration. It's just too big an issue to not investigate it while the market is still relatively small. If it doesn't work well enough, then at least we will know for sure.

[mig27]

Interesting topic!
The canard/delta-wing configurations has some nice anti stall properties in aerodynamic applications.
This was the only way the Concorde could fly at a relative slow speed without the need for complex flap arrangements. The Russian version (aka Concordski) had some small canards up front.



And of course our current highest rated airplane designer Burt Rutan has designed a number of air-planes like this:



Although most principals of aerodynamics and hydrodynamics are close (relative to the density of air and water), they are not the same.

[Peter_Frank]

dsc00813.jpg

There will be no patents, royalties for either a TT or canard design KBHF as prior art can be proven with ease.
Unfortunately the latest canard design that is flying well was not on display at the French KBHF test days, but it will be seen and flown very soon.
R H

This looks more interesting Revhed, as a type like that has its strut further back, which IMO is needed to get good turn characteristics if the front wing is small, and why I am not so sure about the Crazyfoil with its strut so far forward....

Just like the Canard planes, rudder/vertical stabilizer far back for good turning

But only tests can tell

Peter

[ronnie]

Maybe they need to get a highly skilled rider on this to see what it can do?

At 1:35 you can see that when it breaches the surface, it doesn't nose dive, but sinks.

https://www.youtube.com/watch?v=NoSClfB ... tml5=False

[Peter_Frank]

Maybe they need to get a highly skilled rider on this to see what it can do?

At 1:35 you can see that when it breaches the surface, it doesn't nose dive, but sinks.

https://www.youtube.com/watch?v=NoSClfB ... tml5=False

This is really interesting IMO

I dont think the video shows anything, as we often encounter ventilation and ride out - but most often yes, it stalls violently and we go nose first in a huge crash.

If the front wing has some of the lift so the COE is a bit further than the main wing COE only, and the small wing is "lower" - offset down like on the crazyfoil (and I think I saw another test with this principle), then if the main wing ventilates before the front wing (the reason for the offset), it would most likely stall "the other way" meaning sink and you would either slow down but be able to regain control maybe, OR it would shoot up out of the water

Anyways, I find it interesting that the ventilation om a canard will (as I see it) cause the reverse and at least very different effect than the classic feared nosedive we are all so familiar with

PF

[ronnie]

Looking at this front wing and visualising it as a Canard..

https://www.youtube.com/watch?v=Q7HzOgA ... tml5=False



Some windsurf fins are now designed to twist under load (reducing the angle of attack of the tip), to smooth out the lift produced.

It might be possible to use the sweep of the wings to help the Canard configuration work. The lower front wing could be designed to twist, reducing the lift increase because the twisting would reduce some of the angle of attack on the wing compared to the centre section.
The rear wing (because of it's forward sweep, would do the opposite when it twists - increasing the angle of attack of the outer part of the wing as the angle of attack of the central part increased.

The two ends of the wings would want to twist in opposite directions, so if they are joined (which would help stabilise the tips of the rear wing) it would need to be by a strut that allowed them to rotate in opposite directions.