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2011 AI design
http://www.hobie.com/au/en/forums/viewtopic.php?f=71&t=28801		 Page 1 of 4
Author:  davew [ Mon Aug 02, 2010 6:58 pm ]
Post subject:  2011 AI design
I'm hearing wispers of an AI design upgrade for 2011. Any details?
Author:  Cowsgomoo [ Mon Aug 02, 2010 8:15 pm ]
Post subject:  Re: 2011 AI design
Will be available in red or yellow....
Author:  JollyGreen [ Mon Aug 02, 2010 9:39 pm ]
Post subject:  Re: 2011 AI design
I heard it's going to have a sail too. :lol:
Author:  Twerto [ Tue Aug 03, 2010 1:57 am ]
Post subject:  Re: 2011 AI design
Comes with a paddle I believe
Author:  captain-max [ Tue Aug 03, 2010 3:33 am ]
Post subject:  Re: 2011 AI design
Did someone say the Hobie boys were getting re-inspired by hydrofoils?

[youtube]http://www.youtube.com/watch?v=2boayPZ3GbE[/youtube]
Author:  bobco [ Tue Aug 03, 2010 7:46 am ]
Post subject:  Re: 2011 AI design
Max,

Would be nice to have a hydrofoil that can both sail in low wind like the TI or AI but as the wind picks up you can lower the foils and really fly. Perhaps the trifoiler design ideas could be combined with the ease of use of the TI/AI.

Bob
Author:  Slaughter [ Tue Aug 03, 2010 10:33 am ]
Post subject:  Re: 2011 AI design
We all I may weigh a little more but we can get along faster than this bloke..........

[youtube]http://www.youtube.com/watch?v=uO54ZvDwt18&NR=1[/youtube]
Author:  bobco [ Tue Aug 03, 2010 12:56 pm ]
Post subject:  Re: 2011 AI design
At the end of this hydrofoil windsurfing video, a regular windsurfer seems to over take the hydrofoil suggesting that perhaps a TI/AI design to go from displacement to planing on all two or three surfaces may be quick enough and easier to handle in shallow water so landings/launch are easier.
[youtube]http://www.youtube.com/watch?v=1oyWMusaDTI&feature=player_embedded[/youtube]

Bob
Author:  NOHUHU [ Tue Aug 03, 2010 2:11 pm ]
Post subject:  Re: 2011 AI design
The all new Hobie "Trifoil Island"!!

(Sigh) Not in MY lifetime.
Author:  tspbrady [ Tue Aug 03, 2010 2:57 pm ]
Post subject:  Re: 2011 AI design
Seems like it would be easy enough to replace each ama with a fiberglass version with a foil - that would look similar to that kayak. But what to do about holding up the center?
Author:  fishman-rd [ Wed Aug 04, 2010 7:42 am ]
Post subject:  Re: 2011 AI design
Was that a Dune TI I saw in the video at the Outdoor Retailer show (about 19 secs in...) ??

http://www.youtube.com/watch?v=XPKp5asw ... re=channel
Author:  bobco [ Wed Aug 04, 2010 9:08 am ]
Post subject:  Re: 2011 AI design
tspbrady wrote:
Seems like it would be easy enough to replace each ama with a fiberglass version with a foil - that would look similar to that kayak. But what to do about holding up the center?


Replace Amas with finned windsurf boards and flatten the rear underside of the main hull and I bet it would get up on a fast plane going almost as fast as a hydrofoil moth with none of the complexity of draft depth and sensors and much easier than a hydrofoil moth.
[youtube]http://www.youtube.com/watch?v=xW_UfYGO3Kg[/youtube]
Bob
Author:  NOHUHU [ Wed Aug 04, 2010 6:26 pm ]
Post subject:  Re: 2011 AI design
fishman-rd wrote:
Was that a Dune TI I saw in the video at the Outdoor Retailer show (about 19 secs in...) ??

http://www.youtube.com/watch?v=XPKp5asw ... re=channel

That's exactly what it is.

Here's a shot of it on a water demo
Image

No foils on that Yeller AI yet, though. :cry:
Author:  ELM [ Wed Aug 04, 2010 7:43 pm ]
Post subject:  Re: 2011 AI design
The biggest issue I see with foiling an AI TI is the retractable rudder, pins and hull in that area, I doubt they would withstand the increased leverage forces of a longer/deeper rudder.
I tried making a rudder blade that was 900mm long and only 70mm deep with a fine taper to the bottom tip, for when sailing in large white capped swells to see if I could get better control as the waves passed under and the stern and the rudder broke clear of the surface. I found the retractable system loaded up with the force and begin to pop out from the correct position. As my AI is an 07 model but with the cable upgrade lift control fitted, I had to also use the old screw set up that was on the 07 model as well as the cables pulled tight to get it to hold, then the pins started to fail, I used (and still do while my supply lasts) the black soft pins as they protect my hull the best but only use the supplied large blade rudder.

I never calculated actual rudder blade surface area for a comparison but doubt there would be a lot of difference from the standard large blade that comes with the AI, I believe it was due mostly from the extra leverage of the longer length.

I looked at foils for amas mounted on cross braced forward akas and (if you could get it to hold) a foiled rudder blade to lift the rear but I think forward leverage from the sail would be to great and the foils at the front would need to be forward of the mast not even to help counter act that forward leverage.

I read on a few foil sites that planning does not begin until you reach speeds of (depending on craft,weight, draft etc) 9 to 11 knots, these speeds are almost impossible to reach in light winds how ever foil lift would begin from the start and may actually make it feasible, just who will be the first :lol: not me :roll: . Would be cool 8) though.
Author:  bobco [ Thu Aug 05, 2010 1:01 am ]
Post subject:  Re: 2011 AI design
Elm,

I've read that the foiling moth can get up on its foils in only 7 knots of wind. A windurfer can get on a plane in similarly light wind with a large enough sail and light board but he also can bend the sail rig to windward so there is a vertical component to the lift.

I wonder if one could design a sail boat that can have a sail foil that has a vertical component to the lift and thus plane at lower speeds due to less net weight of hull and sailor. But density of water is much higher than air so the vertical lift is much higher. Also the foiling moths's hull is much lighter than an AI or Ti - only 8 kg I think.
But even now I can almost get the TI on a plane in strong wind in a reach when going solo and in rear seat, so I believe it is possible if the ama's and main hulls were flatter underneath.

Bob
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