60 knots - this could be the year (57posted)

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The Waterboy
The Waterboy
VIC
109 posts
VIC, 109 posts
5 Feb 2008 2:27am
Tilmann's 50 over 500m session has kicked up a real ruckus in the GPS Speedsailing world recently with people debating whether the 50 knot grail's been reached or not.

Debate's over guys.

The 50 is old news.

Because Sebastian Cattelan's just posted a session with a 57.5 knot Max GPS (display)....

.... and it's backed up by a 57.3 knot 2 second Max (software).

A session where the top speed recorded was less than 3 knots shy of 60.

And it's only been a bare week since Tilmann's groundbreaking session.

Leaves you wondering what speeds are going to be posted by the year's end eh?

Roll on 2008! Can't wait to see what happens..... and be a part of it!
Bender
Bender
WA
2236 posts
WA, 2236 posts
5 Feb 2008 12:42am
Wow i feel slow

That is bloody fast!!!!!!!!
mathew
mathew
QLD
2174 posts
QLD, 2174 posts
5 Feb 2008 11:45am
As mentioned on GPSSS, it is interesting to see the 100m part of the run so much faster then the 250m part.

I'd also be interested to know the water depth they were sailing in - not because of some :us vs them" argument, but rather it appears that in water that is less than 12 inches (a safe'ish depth for windsurfing) there appears to be something special that is coming into play, ie: maybe it is simply the flat water, but it could be something more like the wing-in-ground effect.

EDIT: it could simply be that the cavitation problems that some of us prescribe as the limit for windsurfing, isn't applicable due to more power in the kite or less hull/fin in the water.
hardie
hardie
WA
4133 posts
WA, 4133 posts
5 Feb 2008 11:34am
I think the speeds being done by the Kite speed crew are just phenomenal, they are real, and windsurfers need to stop trying to make excuses, it's poor form, makes us look like spoilt sooks. (And Mathew not having a go at you I know you're a top bloke, I've met you, you are only trying to be scientific). However, whether it's ground effect, liquid ice whatever, credit where its due. These speeds will never be replicated by windsurfers, unless there is some radical change in technology, which I can't see happening, but I'm no hydrodynamicist, nor futurologist.

Ask yourself this question why do you windsurf? Is it the feeling you get, or the number you get on your gps. I get a buzz everytime I windsurf. YesterdaY WAS ABOUT 13 TO 14 KNOTS ON THE windmeter, and I did 26 knots, it felt unreal.

Good on the kite crew, keep setting those boundaries, let 60 knots be your next goal!!!
decrepit
decrepit
WA
12887 posts
WA, 12887 posts
5 Feb 2008 10:18pm
mathew said...

>>>>>
, ie: maybe it is simply the flat water, but it could be something more like the wing-in-ground effect.



There definitely is a ground effect, I have a mate who paddles our estuary, he notices a marked slow down in shallow water. His theory is, ground effect throwing up a bigger bow wave, meaning he has to paddle more up hill. My understanding of planing, is that the board's sitting in front of the wave instead of behind it. So a bigger wave's giving more lift. But don't think that would equate to 10kts extra speed.

If I ever get my twin fin working, maybe I'll be brave enough to find out.
mathew
mathew
QLD
2174 posts
QLD, 2174 posts
6 Feb 2008 12:45pm
Hey Hardie - definitely not whinging. As you said, windsurfing is not likely to catch up to those speeds using the current gear, which is exactly why I posted the question -> it may actually be possible for windsurfing to learn some tricks from kitesurfing...!

Kitesurfing may have only had 10 years of development, compared to windsurfing with about 30 - but kites adapted lot of knowledge from windsurfing, just like windsurfing adapted a lot of knowledge from surfing. I have always thought that it was only a matter of time before kites went faster, and am a little surprised that it has taken this long; I was recently starting to think that they would run into the same fundamental limits as windsurfing, but its good to see that kitesurfing is achieving exceptional results.

Which is great news for windsurfing...! Now that we have conclusive evidence of a faster sailing craft, it shows that there may be other designs that windsurfing can use, eg:
- say possibly using 10cm fins
- different board designs, say something closer to a kite board but doesn't require mast-foot pressure
- maybe sails that generate some vertical lift.


Aside: One of the reasons for me asking/stating various ideas about water-depth and kite-slingshot is that these kind of questions need well though-out responses... With a very shallow water depth (gut feeling of below 6in) results in something similar to ice-sailing, ie the water is acting as a lubricant. For the kite-slingshot, then there is energy storage/transfer occurring - assuming its actually possible to slingshot at those speeds.

... These speeds have even got me thinking that I should get my kites out of storage to do some speed runs (I'm just not a fan of the excessive risk factor of kiting).
jp747
jp747
1553 posts
1553 posts
6 Feb 2008 9:43pm
that is fast pheew! got to bow down for now every year on the stats, kiters generaly go faster every year and i think matthew's right the sailing world could learn a lot from this...hmmm 10cm fins at 20cm intervals at just the right spots underneath a sailboard might just do the trick
Haircut
Haircut
QLD
6491 posts
QLD, 6491 posts
8 Feb 2008 12:57pm
it's all over. kites have smashed the world speed record and there's nothing left to fight for

so throw away them gpses, throw away those cams, get yerselves a waveboard or freestyle board and it's time to learn to windsurf good'n'proppa


flame suit set to extreme
hardie
hardie
WA
4133 posts
WA, 4133 posts
8 Feb 2008 12:16pm
Haircut said...

it's all over. kites have smashed the world speed record and there's nothing left to fight for

so throw away them gpses, throw away those cams, get yerselves a waveboard or freestyle board and it's time to learn to windsurf good'n'proppa


flame suit set to extreme





BTW the only person I'm competing against other than myself is Elmo, as long as my gps says I'm faster than his GPS then life is complete
elmo
elmo
WA
8896 posts
WA, 8896 posts
8 Feb 2008 1:06pm
hardie said...

Haircut said...

it's all over. kites have smashed the world speed record and there's nothing left to fight for

so throw away them gpses, throw away those cams, get yerselves a waveboard or freestyle board and it's time to learn to windsurf good'n'proppa


flame suit set to extreme





BTW the only person I'm competing against other than myself is Elmo, as long as my gps says I'm faster than his GPS then life is complete



shed some weight fat boy
decrepit
decrepit
WA
12887 posts
WA, 12887 posts
8 Feb 2008 8:48pm
Hey, my 18cm weedy is just about ready to roll, you 2 had better watch out!!!
elmo
elmo
WA
8896 posts
WA, 8896 posts
8 Feb 2008 9:20pm
decrepit said...

Hey, my 18cm weedy is just about ready to roll, you 2 had better watch out!!!


Is that the Carbide coated Titanium jobby you've been working on in the Lab??
nebbian
nebbian
WA
6277 posts
WA, 6277 posts
8 Feb 2008 9:51pm
elmo said...
... the Lab??


Ha ha ha very appropriate
decrepit
decrepit
WA
12887 posts
WA, 12887 posts
8 Feb 2008 10:29pm
I'd have thought it's much too messy to be called a lab.

No haven't tried the silicon carbide yet, this one's testing some stainless steel wire on the leading edge.
The 20cm version has a small stainless plate near the tip, works well but doesn't go down quite far enough, I'm getting a bit of wear at the junction.
The wire on the 18cm covers the bottom 3/4 of the leading edge.
I'm just not sure how well the bond will work in practice, epoxy doesn't seem to grab stainless all that well.
If it falls off, then I'll give the silicon carbide a go.
Haircut
Haircut
QLD
6491 posts
QLD, 6491 posts
9 Feb 2008 12:45pm
is the wind situation over there really as bad as everyone is making out?
hardie
hardie
WA
4133 posts
WA, 4133 posts
9 Feb 2008 2:57pm
Haircut said...

is the wind situation over there really as bad as everyone is making out?



Yes

having to sail early morning easterlies to have a sail
decrepit
decrepit
WA
12887 posts
WA, 12887 posts
9 Feb 2008 5:19pm
hardie said...

Haircut said...

is the wind situation over there really as bad as everyone is making out?



Yes

having to sail early morning easterlies to have a sail



If you've got big enough gear
Haircut
Haircut
QLD
6491 posts
QLD, 6491 posts
9 Feb 2008 6:52pm
wow. did you get much of a season at all?

I still don't think huey has really made up for a month and a half of no wind during SE qld spring /early summer. We've had a full week of 30 knots + the occasional 20 knotter here and there
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