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 Post subject: speed record broken
PostPosted: Thu Nov 29, 2012 3:03 pm 
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Joined: Sat Oct 29, 2011 4:27 pm
Posts: 556
Location: Central Oregon
This thing hauls the mail!!!!!!!!!!! :shock:

http://youtu.be/pipGWQmerEQ

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1980 H16
1997 Wave


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 Post subject: Re: speed record broken
PostPosted: Thu Nov 29, 2012 3:39 pm 
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Joined: Sat Jul 25, 2009 11:19 pm
Posts: 357
Location: San Diego
Ahhhh that aint nothing, I reguraly go that fast with my 18.





On the highway.

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ALLEY CAT 1984 RED LINE HOBIE 18 MAGNUM
Sail # 10505 or 277
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 Post subject: Re: speed record broken
PostPosted: Thu Nov 29, 2012 3:47 pm 
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Joined: Tue May 27, 2003 12:44 pm
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Location: Oceanside, California
That is clearly over the recommended trailering speed!

75.23 MPH!!! (65.37 Knots)

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Matt Miller
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 Post subject: Re: speed record broken
PostPosted: Thu Nov 29, 2012 4:53 pm 
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Joined: Sat Jul 25, 2009 11:19 pm
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Location: San Diego
It was down hill with the wind behind me while trying to merge with three lookouts for only 2 seconds.

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ALLEY CAT 1984 RED LINE HOBIE 18 MAGNUM
Sail # 10505 or 277
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 Post subject: Re: speed record broken
PostPosted: Thu Nov 29, 2012 9:18 pm 
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Joined: Fri Nov 23, 2012 3:50 am
Posts: 4
Location: Australia, WA
Creative wrote:
mmiller wrote:
That is clearly over the recommended trailering speed!

75.23 MPH!!! (65.37 Knots)



Amazing result!!!

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Boatbit...tagging 100.000 hobbies around the world!!!


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 Post subject: Re: speed record broken
PostPosted: Fri Nov 30, 2012 9:47 am 
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Joined: Mon Sep 20, 2004 12:36 pm
Posts: 758
Location: Tri-Cities, WA
WOW


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 Post subject: Re: speed record broken
PostPosted: Fri Nov 30, 2012 10:14 am 
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Joined: Mon May 09, 2005 10:25 am
Posts: 2592
Location: Jersey Shore
That thing is truely awesome. Seems like not that long ago 40 knots was the number to beat.

I love the footage at 0:57 seconds when he bears off about 20 degrees and the thing goes from fast to warp speed.

sm


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 Post subject: Re: speed record broken
PostPosted: Fri Nov 30, 2012 11:21 am 
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Joined: Thu May 03, 2012 4:56 pm
Posts: 51
YEA -- Lots of discussion over on the kite board forum on just
how we could get our record back,(until sail rocket/we were the fastest).
A kiter had taken the record away from Hydrosphere by going 55Kt . We
were all Happy until sail rocket came along.

The only thing i Don't like about sail rocket is that it can only go in
one direction.

BILLe


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 Post subject: Re: speed record broken
PostPosted: Fri Nov 30, 2012 12:04 pm 
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Joined: Wed Jul 06, 2005 2:15 pm
Posts: 1088
Location: Oakland, CA
If Oracle wins the America's Cup then Larry Ellison may have a new design to consider for the next Cup.


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 Post subject: Re: speed record broken
PostPosted: Fri Nov 30, 2012 9:46 pm 
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Joined: Fri Apr 13, 2012 9:06 am
Posts: 278
Location: Charlotte, NC
On the few articles I lightly browsed I don't see the wind speeds this was achieved under. I mean, if there's an even better blow, could there be a even better incremental speed boost, right? I hope :mrgreen:
Or are there design limits involved... a few more knots but not logarithmically so obviously...rhetorical question and curiosity mainly on my part.

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Jonathan
'85 H16 __/) 87468 Tidal Wave
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 Post subject: Re: speed record broken
PostPosted: Sat Dec 01, 2012 6:23 am 
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Joined: Mon Jul 14, 2003 7:11 pm
Posts: 4623
Location: Detroit, MI
jonh wrote:
On the few articles I lightly browsed I don't see the wind speeds this was achieved under. I mean, if there's an even better blow, could there be a even better incremental speed boost, right? I hope :mrgreen:
Or are there design limits involved... a few more knots but not logarithmically so obviously...rhetorical question and curiosity mainly on my part.

The wind speed in which they set the most recent record (65+ kts) was in the high 20's (28 - 29 kts).

The relationship between wind velocity and speed is not linear. Drag increases roughly as the square of velocity.

What's more limiting to Sail Rocket is the shape of the foils - both the wing and the hydrofoil. Foils that work well at lower speeds don't work well at higher speeds. (This is why planes have leading edge slats and flaps.)

Additionally, the SR2 team has had problems with ventilation and cavitation on the hydrofoil. The addition of a fence allowed them to achieve a higher speed without sucking air down from the surface.


The hydrofoil also has a foil section meant to deal with cavitation (it's wedge-shaped, with a sharp leading edge instead of teardrop-shaped)
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 Post subject: Re: speed record broken
PostPosted: Sat Dec 01, 2012 9:48 pm 
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Joined: Fri Apr 13, 2012 9:06 am
Posts: 278
Location: Charlotte, NC
Matt, over my head but majored in engineering had a few nav architecture 101 courses sprinkled in so appreciate the science behind it.

So reading on the HCNA site that Paul Larsen is a Hobie 16 and Hobie Tiger sailor? Awesome!

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'85 H16 __/) 87468 Tidal Wave
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 Post subject: Re: speed record broken
PostPosted: Fri Dec 07, 2012 10:32 am 
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Joined: Wed Jul 06, 2005 2:15 pm
Posts: 1088
Location: Oakland, CA
It doesn't always work out. Too bad he didn't stick the landing, then he'd inadvertently set another kind of record.



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