Oh Lordy (Doug)

[PI Design]

Thanks for sharing that Jon.

Attached below is a fascinating article by Paul Larsen (helm of SailRocket). It gives a real insight into what they are going through, and clearly describes the directional stabilty problems they have. Its well worth a read.
http://www.yachtsandyachting.com/news/?article=136223

[sigurd]

how does it stay inside the water? is there a hook shape, is it inclined, or is the arm that is holding it excerting aerodynamic downforce, or is the hull, hanging in air between the foil and the wing, pushing it down?

If all the boat leaves the water, will it glide properly back, and at what pitch angle is it then assumed to land?

[Jon Howes]

Sigurd,

1: It is inclined

2: The arm can generate downforce, upforce, or no force, depends on the needs of the course sailed.

3: Both foil and wing generate an upforce and the hull balances this with its weight.

4: If the entire boat leaves the water it is stable, both statically and dynamically, in all respects except for roll. A roll acceleration towards the wind occurs to ensure that the foil is the first element to make contact with the water. Pitch angle at landing is the choice of the operator, just like a stable aircraft.

Jon.

[Munter]

So Jon,
How is the boat coming along? Its been a long time since the web page was updated.

[Jon Howes]

Thanks for the enquiry, no bl**dy money at present so working on other projects to allow us to self-sponsor. I am buliding a larger model at present and going all out for speed with this one rather than just functionality since I would like to see at least how fast I can get a "sailing object" to go. This one uses a couple of small hydrofoils under the hull to get the hull out initially as it allows a better aerodynamic shape if not compromised by the need to plane before take-off. Will keep this forum posted as it moves on.

Jon.

[woodchuck]

What ever happened to the monofoil? Did it ever get built? I believe the trash in the Gulf would destroy anything at 100mph. I hear of boats punched at much less speed.
woodchuck

[Jon Howes]

"What ever happened to the monofoil? Did it ever get built? I believe the trash in the Gulf would destroy anything at 100mph. I hear of boats punched at much less speed.
woodchuck"

Read my previous post. Wing complete, all moulds complete, no money, building a new, larger model in frustration. I will finish this off when I can afford it.

Jon.