the physics behind jumping, please explain!

[Guest]

could someone explain o me how you can jump with a kite?
i know how to, i just wanna know how it works, scientifically, why do you lift off?

[Guest]

swing a pendulum

[Fleetboarder]

More loading of your lines will create more tension and when the edge of your board is released from the water along with a little jump from you also, that combined with the tension on the lines and the upwind stroke of the kite creates lift.

[gaffer]

there's four basic components at work

Lift produced by the kite
Pendulum effect of reversing the kite
Pop from the board
Boost from a wave or ramp

Use any one to jump use all three with perfect timing to get huge air

[Peter_Frank]

On 2002-11-19 09:57, gaffer wrote:
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distance is your friend

What are you saying here ???
Is it simply that you don't like to kite near objects and other kiters ?
Just wondering...

[sq225917]

basically there area couple of simple forces at play here, drag, momentum, and centrifugal force.

you mover in one direction building up speed and momentum, you fly the kit backwards this creates an equal and opposite momentum, but eventually this will be more than your momentum. as you fly the kite across you elastically load up the lines, as the kites momentum overtakes your own and then overtakes your board grip+ momemtum, the kite picks you up.

if you can time in releasing the board voluntarily at exactly the time your momentum fails then kapow.........

[Guest]

On 2002-11-19 10:39, Peter_Frank wrote:

What are you saying here ???
Is it simply that you don't like to kite near objects and other kiters ?
Just wondering...

yes thats about it, I think I pinched from Rick Iossi but basicly when the shit hits the fan you can cover a lot of ground very quickly in this sport, whether you end up just filling your pants or crushing your skull depends on the distance between you and the nearest hard object. So distance is your friend because it might just give you enough time to save your bacon.

[moray]

i was curious about this as well. so last weekend after a nice lobster evening in montauk we took out a trainer kite and tried to figure it out. after a few face plants we figured it has mostly to do with kite speed, kite location, and loading against the kite. felt like a spring/coil with differential loading power was closets physical analogy.

peace out

moray

[Shabby]

The reason why you can jump is because of the first Law of Newton action=reaction.
The air that flows along the kite (either because of the wind or because the kite is moving) pushes against the surface of the kite (same as with an airplane wing) and thereby generates a force perpendicular to the kites surface. If you steer the kite to the zenith eventually the force will be pointing upwards enough to lift you off the water. The straighter the force is pointing upwards the higher you will jump, therefore if you can prevent yourself from being lifted too soon (by edging hard) you will jump higher.

[funalex]

when you're riding fast, you put your kite behind you, so at the opposite of you direction, this action creates a reaction in stopping you hardly, but as the kite is positionned over you, it results in a vertical lift.

You're right asking these questions, because you'll progress a lot !