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Have you tried kiting with 120m lines? This guy did!

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bigtone667
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Re: Have you tried kiting with 120m lines? This guy did!

Postby bigtone667 » Wed Jan 15, 2020 12:05 am

I have 50m race lines and I was able to drop a few kite sizes. It works really well but you need a kite that de-powers well as it flies through the power zone.

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edt
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Re: Have you tried kiting with 120m lines? This guy did!

Postby edt » Wed Jan 15, 2020 1:33 am

PugetSoundKiter wrote:
Tue Jan 14, 2020 10:57 pm
:o
Milko0k wrote:
Tue Jan 14, 2020 9:14 pm
How about 200?

Drag = 0.5 x Drag Coefficient x Area x Density x Velocity²

Drag Coefficent of a Sphere = 0.48
Kite Line Diameter = 0.0015 m
Line Area = (200m x 4) x 0.0015 = 1.2 m²
Air Density = 1.225 kg/m³
Velocity = X m/s

At 9.7Kts, 5m/s
Line Drag = 8.82N = Weight of 0.9kg or 2lbs

So at 13.6Kts, 7m/s
Line Drag = 17.29N = Weight of 1.76kg or 3.88lbs

So at 15.5Kts, 8m/s
Line Drag = 22.58N = Weight of 2.3kg or 5.1lbs

:duh:
a sphere is around .5 something like that but a cylinder is somewhere around 1.2 something like that, correct me if I'm wrong. also typical cruising speed of a kiter is 20 knots so you want to compare 20 knots to 33 knots something like that. I just now from personal experience I start feeling the drag on the lines when you get above 50 meters.

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Re: Have you tried kiting with 120m lines? This guy did!

Postby Bille » Wed Jan 15, 2020 4:48 pm

Two things on those 100m lines :

* "He" was kiting on a lake with no apparent signs of wind ; and Nobody else was !

** "He" was having a Blast ; everybody else was just watching !! :thumb:

I could see where an electric reel-Out/in winch , could come in handy here ?

Bille

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Re: Have you tried kiting with 120m lines? This guy did!

Postby dice » Wed Jan 15, 2020 5:49 pm

Matteo V wrote:
Tue Jan 14, 2020 7:28 pm
Toby wrote:
Tue Jan 14, 2020 7:17 pm
Some guys did before.
Nice and slow the kite will turn....
Kite turning speed is the same, ...

...length of line is typically limited to anywhere from 12m to 30m. Shorter, and the kite flies too fast...
Is it the same, or too fast? :lol:

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Re: Have you tried kiting with 120m lines? This guy did!

Postby Peter_Frank » Wed Jan 15, 2020 6:41 pm

edt wrote:
Tue Jan 14, 2020 8:50 pm
Also does it work? There's no set answer. Maybe you have a marine layer or the wind is doming so there's some wind at 100 meters blowing 30 knots and at Sea level it's blowing 1 knot. Sure then it's great. But maybe it's blowing 7 knots at Sea level and 8 knots at 100 meters. Then no it does nothing the extra drag would make long lines worse than short ones.

Go make some 100m lines by tripling some line sets you understand better. It's something fun to do on a light wind day but in terms up practical use I put it up there with stacking kites.

50m lines are useful above that usually not so much

Very true.

If there are no extreme jumping sheer wind, meaning suddenly a lot more wind above a certain height (quite rare), then at some point you wont gain from the longer lines nomore.

As in a normal wind gradient, the big advantage is the longer and much more efficient powersweep when kite is dived.

But above a certain length, you dont gain anymore, and of course loose on feedback and agility.

So yes, I believe, from experience, that 30-40 meter line length is the max in order to utilize marginal wind, with the typical wind gradient you got :rollgrin:

8) Peter

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Re: Have you tried kiting with 120m lines? This guy did!

Postby POACHER » Wed Jan 15, 2020 6:56 pm

Not one megaloop in either video.......unreal. :rollgrin:

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PugetSoundKiter
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Re: Have you tried kiting with 120m lines? This guy did!

Postby PugetSoundKiter » Wed Jan 15, 2020 7:04 pm

edt wrote:
Wed Jan 15, 2020 1:33 am
a sphere is around .5 something like that but a cylinder is somewhere around 1.2 something like that, correct me if I'm wrong. also typical cruising speed of a kiter is 20 knots so you want to compare 20 knots to 33 knots something like that. I just now from personal experience I start feeling the drag on the lines when you get above 50 meters.
Good catch, you’re right. :thumb:
https://www.engineeringtoolbox.com/drag ... d_627.html
Wires and Cables Cd = 1.0 - 1.3

Drag = 0.5 x Drag Coefficient x Area x Density x Velocity²
Drag Coefficent of a Wire = 1.2
Kite Line Diameter = 0.0015 m
Line Area = (200m x 4) x 0.0015 = 1.2 m²
Air Density = 1.225 kg/m³
Velocity = X m/s

At 9.7Kts, 5m/s
Line Drag = 22.05N = Weight of 2.25kg or 4.96lbs

So at 13.6Kts, 7m/s
Line Drag = 43.2N = Weight of 4.41kg or 9.72lbs

So at 15.5Kts, 8m/s
Line Drag = 56.45N = Weight of 5.75kg or 12.70lbs

So at 19.4Kts, 10m/s
Line Drag = 88N = Weight of 9kg or 20lbs

The rider pulls half the drag and the kite pulls half the drag, so if you could get to 20kts that would be a lot of added drag the kite would need to overcome. I’d assume when sining the kite, drag would quickly limit the velocity. At the sine peak, when velocity seen by the kite is a minimum, the drag may overcome lift needed and :snow:
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Re: Have you tried kiting with 120m lines? This guy did!

Postby Matteo V » Thu Jan 16, 2020 2:46 am

dice wrote:
Wed Jan 15, 2020 5:49 pm
Matteo V wrote:
Tue Jan 14, 2020 7:28 pm
Toby wrote:
Tue Jan 14, 2020 7:17 pm
Some guys did before.
Nice and slow the kite will turn....
Kite turning speed is the same, ...

...length of line is typically limited to anywhere from 12m to 30m. Shorter, and the kite flies too fast...
Is it the same, or too fast? :lol:
Turning speed is always the same.

Kite speed is pretty much always the same (drag on lines is another issue). But this refers to the actual airspeed of the kite.

Speed through the window, if referring to the time it takes for the kite to get from one edge of the window to the other, does change with different length lines. So this would be best to reference as "Time across the window", instead of kite speed.

Does that help?

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Re: Have you tried kiting with 120m lines? This guy did!

Postby harppa » Thu Jan 16, 2020 11:26 am

We did it with 140m lines :D

Baptiste_FR
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Re: Have you tried kiting with 120m lines? This guy did!

Postby Baptiste_FR » Thu Jan 16, 2020 11:34 am

With very very long lines, you need a very large bar to compensate the slack in lines (and create leverage effect).
I'm not sure how responsive is the kite with a 55 cm bar and more than 50m lines ? Must be quite slow to react.


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