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What causes jellyfishing?

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spork
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What causes jellyfishing?

Postby spork » Mon Jul 19, 2021 7:03 am

I've got an OLD Waroo 9M that I used to love, but now it's started jellyfishing and I can hardly stand it. Does this happen to older kites when they get bagged out?

I'm thinking of going after it with the sewing machine, but would love some recommendations of what to try.

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Re: What causes jellyfishing?

Postby BillyGoatGruff » Mon Jul 19, 2021 7:44 am

The original Waroo was renowned for jelly fishing and sometimes completely inverting. The support on the leading edge was insufficient and you can't really pump them to high pressure to compensate for this as the stitching was not the strongest. Very little you can do with that kite to imporve the perfomance.
Last edited by BillyGoatGruff on Mon Jul 19, 2021 8:54 pm, edited 2 times in total.

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Re: What causes jellyfishing?

Postby spork » Mon Jul 19, 2021 7:56 am

I used it for years without it pulsing like this. This is a new development. I figured it must have resulted from wear over time.

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Re: What causes jellyfishing?

Postby bragnouff » Mon Jul 19, 2021 12:03 pm

Could be because it's leaking pressure from a valve that starts peeling off. Affects most kites after 10yrs.
If it's still properly inflated, could it be that you're loading it more? Do you ride more powered than before? Riding in stronger winds, but relying more on depower would do that. Or did you gain weight? Do you ride now with a different board than before? Riding with a slower/faster board would position the kite differently in the window

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Re: What causes jellyfishing?

Postby JakeFarley » Mon Jul 19, 2021 12:42 pm

If you can find the bridle line plan, check the bridle segment lengths.
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Re: What causes jellyfishing?

Postby alexeyga » Mon Jul 19, 2021 1:02 pm

Both bridle and canopy stretch as a kite ages. Some brands/models more than others. Has a lot to do with the kite is designed - how the canopy is cut and assembled, materials, etc. Some designs / kite shapes take up the slack better - while others - have no leeway at all.

I've experienced it with Epics big time.
-Got a lightly used Renegade for a friend, kite literally looked and felt like new. However it was jellyfishing and inverting like a mofo.
-My personal 13m Renegade which I've purchased brand new. Not even 12 sessions old - it started folding wing tips when jumped or steered a bit more aggressively.

That's when I pulled the plug on this brand. Haven't experienced it since with any other brands I used/owned/observed, F-One, Core, Zeeko, Airush, Eleveight, Cabs, Naish.

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Re: What causes jellyfishing?

Postby Herman » Mon Jul 19, 2021 7:40 pm

What is your definition of jellyfishing?

Is it an oscillation with the tips flaring in and out at a particular frequency?

Or is it the leading edge buckling and the tips folding in as the LE kinks, usually occurring when loaded up?

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Re: What causes jellyfishing?

Postby sflinux » Mon Jul 19, 2021 8:03 pm

I've had waroo and bularoo kites both do this. I hate kites that do this. The TS does not and is a better kite imo. The best branded non bridled kites designed by EH did not do this either.
I would check the bridle. Pulleylines that go through a pulley tend to shrink, which can cause the system to go out of tune.
The next thing I would try is the inflation pressure. On some kites pumping the kite up rock hard eliminates the jellyfish. If that doesn't work, try a lower inflation pressure. I've had kites like the 2004 North Vegas which flies better when there is less pressure in the leading edge.

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Re: What causes jellyfishing?

Postby alexeyga » Mon Jul 19, 2021 9:06 pm

Herman wrote:
Mon Jul 19, 2021 7:40 pm
What is your definition of jellyfishing?

Is it an oscillation with the tips flaring in and out at a particular frequency?

Or is it the leading edge buckling and the tips folding in as the LE kinks, usually occurring when loaded up?
What difference does it make? In either case the kite is doing the flappy thing and is unridable as such.


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Re: What causes jellyfishing?

Postby Herman » Mon Jul 19, 2021 9:31 pm

To me they are very different and jellyfishing it is not a flappy thing. For example if you look at a round parachute at first deployment you will see it oscillate just like a jellyfish as the springiness of the system settles down. This can also be seen when jumping with some kites, old C kites in particular.

Leading edge buckling is a totally different thing imho and the cures for the two are totally different. But don’t get in a flap about it! I don’t care what you want to call it.
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