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Can you over inflate a kite?

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Created by belldiver > 9 months ago, 2 Jun 2013
belldiver
QLD, 171 posts
2 Jun 2013 5:33PM
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Just wondering if you can over inflate a kite?

Any stories of pumping them up and letting go on the beach?? pretty embarrassing and annoying haha.

I understand the only problem is crashing a kite and as it folds it can over inflate and burst?

Dl33ta
TAS, 461 posts
2 Jun 2013 6:08PM
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Guy in the shop told me they inflate the north kites up to 30 psi for integrity testing. If that's true I'm guessing it'd be pretty hard to over inflate with a hand pump. It will usually spit out at around 10 psi. If that gives you 20+ psi spare to take a fold I guess that is pretty safe still as long as the containing fabric is in good nick.

zarb
NSW, 628 posts
2 Jun 2013 6:19PM
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Yeah don't think you have to worry about it using a hand-pump. Your arms are more likely to fall off first.

Kazan
QLD, 699 posts
2 Jun 2013 6:46PM
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Yeah. Almost impossible to over pump by hand. You'd have to be the Hulk to get it near 20psi even!
However, my tip to know when enough is enough, is to try and bend one of the wings of the LE. You should struggle. That's about 8 to 10psi.

Kozzie
QLD, 1451 posts
3 Jun 2013 2:55PM
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disregard most if not all the above posts.

you can easyily over inflate your kite.
you must allways be aware that gas when heated expands.

if you pump your kite up as mutch as it allows and then its left on the hot sand for any period of time it will heat and BANG!

sounds like gunfire on some beaches.

allso older bladders thin out and become weaker as stretched and can be easily popd via hand pumping to much.

anyways hope that helps and everyone doesnt try jump down my throat now.

huddy
QLD, 85 posts
3 Jun 2013 6:53PM
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Yer a friend of mine had an older model best kite. And the bladder popped on him while pumping it up on the beach. It can defiantly happen.

puppetonastring
WA, 3619 posts
4 Jun 2013 8:01PM
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Any info that gives any cause to anyone NOT to inflate their kite to the max. is simply selling poor kiting experiences.
All of the big brand kites today rely on a tight LE as a part of the integrity of the design. The tighter they are the less the deformity under varying loads. When the pressure is low it becomes easier for the kite to give in at the edges. It behaves sloppy and slower and also gives less power at any point of the window.
Anything below 8 in any of the current, 2011+, model kites will not deliver the performance it it designed to give. And they are at their best if you pump to 10+. Especially the deltas.
For a bladder to blow on the beach during, or having just been pumped, is a bladder about to go - better on the beach than on the water.
From the many reports I get to hear about that is where it usually happens. And its always 1) a brand new kite with a factory fault bladder or 2) its a very well used older kite. In this case its just one possibility of the ways your kite will be telling you its probably hit its 'use by' date.

My guess is this lighter & tighter era of kites is producing reduced longevity of 'good quality' flying time to be had out of any kite. Time will tell.
Hard as rock is definitely the way to go.

belldiver
QLD, 171 posts
4 Jun 2013 10:14PM
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Thanks Puppet. I had a Rebel that said it should be inflated to 6psi and now have a Bandit.

I've been inflating the bandit to 8 psi and wondered if I could go higher.

I felt it could but was unsure.

SaltySinus
VIC, 960 posts
4 Jun 2013 11:10PM
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I took my Rebel out last weekend and had a kitemare partly because the kite was under inflated and it turned itself inside out...

I'll be aiming for 30psi next time!

SaltySinus
VIC, 960 posts
4 Jun 2013 11:11PM
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Oh, follow up, when I pump up my kite with my North pump, The pressure gauge flicks up but doesn't hold to show the pressure. If I press hard it shoots upbut I can't really tell how much it's pumped up. Is that just my kite?

Peelgeo
WA, 36 posts
4 Jun 2013 10:48PM
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A bit off topic....

I changed out a bladder not too long ago and forgot to tuck in one end of the bladder into the wing tip of kite and secure the velcro (Cab Vector). Hence when I went to pump up again the bladder popped (A straight shear rip in the bladder at the end, ie. 90 deg to the leading edge), it popped at a pretty low pressure. The bladder was new.

I'm guessing by the bladder failure occuring at a low pressure and due to forgetting to secure the bladder into leading edge at wing tip, that the bladder had too much pressure at the tip (at the exposed area), and that it relies on the structure of the kite leading edge to stop it balooning and rupturing. Am I right in assuming this?

Anyways it was a rookie mistake that I hopefully won't be repeating any time soon

Gorgo
VIC, 4993 posts
5 Jun 2013 11:54AM
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Can you over inflate a kite? Short answer, no. It's almost physically impossible. I weigh 80kg and pump my kites as hard as I can get them with my arms. To over pump your kites you would have to put your full body weight on your pump and force it down. You would have to try really, really hard to get it to happen.

That's not the same as leaving your struts inflated and leaving the kite in a hot car. Struts have exploded in those circumstances.

Kamikuza
QLD, 6493 posts
5 Jun 2013 6:19PM
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Select to expand quote
SaltySinus said..

Oh, follow up, when I pump up my kite with my North pump, The pressure gauge flicks up but doesn't hold to show the pressure. If I press hard it shoots upbut I can't really tell how much it's pumped up. Is that just my kite?

Depends on the valve in the kite - Cabrinha valves are those big one-way things and only show pressure when you are pumping air in. The smaller "traditional" valve in my OR Flite also has a one-way flap, but continually shows pressure.

Gauges are pretty much a waste of time - go with the "folding the LE" technique... then you'll get the best out of it.

I've always pumped up my kites hard - certainly a lot more than the locals do with their electric pumps - but I can still invert the kite or bend the LE if I goof up...

Dl33ta
TAS, 461 posts
5 Jun 2013 10:08PM
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Find as well sometimes it takes a while for the struts to equalize its pressure with the leading edge. So if you're watching a guage and pumping it up mega fast trying to get on the water, it will deflate a bit as some of the air goes out to the struts. If in doubt rest for a bit and then give it some more, specially with the North five strut thing.

AKSonline
WA, 925 posts
Site Sponsor
6 Jun 2013 1:55PM
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Hi Guys,

Do not over inflate your kites. Inflate to the manufacturers recommended figure and don't go beyond. A kite that needs more than recommended pressure to maintain structural integrity is poorly designed. There are a couple of brands come to mind that pucker their wingtips due to design, they tend to need P-Lines.

Here is a couple of things to keep in mind:

1/ When you are pumping, you are compressing air, which creates heat. The hot air inside the LE will cool. As gas cools it contracts.

2/ When you leave a kite inflated on a hot beach, the air in the LE expands and increases pressure.

3/ When you crash your kite in the water on a cool day and then relaunch it, you get an airconditioning effect as the water in the fabric evaporates in the wind. This cools the air and contracts effecting the pressure.

4/ The gauge that comes with most kites retails at about 8 dollars, that means it probably costs about $1 to manufacture in China. They're not that accurate! Learn to feel what the pressure in your leading edge feels like when correctly inflated and stick to the feel/squeeze method to back up your gauge.

This is why you only inflate to manufacturers recommended pressures, it should allow for all of these extremes. Cheaper kites can be destroyed by over inflating. DON'T pump your kite up "To the MAX"

DM

cauncy
WA, 8407 posts
7 Jun 2013 8:14PM
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as mentioned dont trust the pressure gauges i usually give mine a flick, sounds weird but after flying and pumping kites for a fair while i know the sound i want for a properly inflated kite, i prefer mine a touch over inflated rather than under but big stacks can become damaging to the kite where as a touch under is much more forgiving,

pattiecannon
QLD, 593 posts
8 Jun 2013 3:49PM
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I like to ride my kites pumped hard. The gun kiter of our group has them really soft.
It's up to you. I popped a rev pumping it till the pump wouldn't go down any more.
I turned it over ran out the lines, connected up, an' BOOM! it was all over down at
the LE last strut valve. Off to Moti.
I just go the "drum test" on the LE - it should sound "tinnie" , the ol' squeeze the main strut test - it's gotta be "sillocone firm"lol,
- and if you're not sure try and bend the LE somewhere up near the last strut If it bends too easy = keep pumping



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"Can you over inflate a kite?" started by belldiver