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Easy Pre-inflation ideas

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OzBungy
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Re: Easy Pre-inflation ideas

Postby OzBungy » Sat Apr 22, 2023 9:45 am

Make yourself an inflation bag. A bit of a nozzle at one end that hooks up to the deflation port. My foil has velcro so a bit of matching velcro to secure it. Alternatively a bit of PVC pipe that will fit in any convenient opening.

Open at the other end, maybe a couple of stiffeners to help roll it.

Attach nozzle to kite. Scoop air in the big end. Close the end then squish the air into the kite.

You could probably make a prototype out of a garbage bag.

Herman
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Re: Easy Pre-inflation ideas

Postby Herman » Sat Apr 22, 2023 10:06 am

Maybe you could adapt one of those quick inflating lazy bag (you wave it about) sofa/bed thingy magigs that are sold for sunbathing as your inflation bag?

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Re: Easy Pre-inflation ideas

Postby evan » Sat Apr 22, 2023 11:02 am

If time is key and you have a wind shadow where you can't pull the kite out of deflated a pump makes sense.

When not in a hurry you can just wait a bit when the kite is layed out on the ground. My race kites self inflate then to about 1/3 - 1/2 full, so if you lay kite kite first and then get your wetsuit on, foil unpacked etc you won't need to pre-inflate it at all.


Another thing I see a lot of people do wrong is that they launch the kite with the bar depowered and waiting for the tips to eventually fill. This works somewhat on low AR kites (high AR will collapse this way) but even those will inflate in just 10% of the time when you keep the kite deep in the wind window (almost stalled).


At least I get my kites to fill in seconds with a snake launch and keeping the kite deep that I never bothered to pre-inflate them.

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Re: Easy Pre-inflation ideas

Postby Peter_Frank » Sat Apr 22, 2023 8:45 pm

What is a "snake launch"???

And why the name? :naughty:

8) Peter

OzBungy
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Re: Easy Pre-inflation ideas

Postby OzBungy » Sat Apr 22, 2023 10:37 pm

Cobra launch cause it looks like a Cobra rearing up.

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artificialname
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Re: Easy Pre-inflation ideas

Postby artificialname » Sun Apr 23, 2023 1:02 am

Smeagle wrote:
Fri Apr 21, 2023 1:33 pm
Janus wrote:
Fri Apr 21, 2023 1:02 pm
Do a 6 o clock start, it has a name I don’t want to mention. Hot launch.

I use a bilge-pump too. It's small and I use an electric pump for pumping LEI too, so I have that Battery already... I really see no real alternative to that...

If I buy a $30 bilge pump that is listed as "12v" could I expect it to operate with one of these:


They have 55amps

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Re: Easy Pre-inflation ideas

Postby Herman » Sun Apr 23, 2023 9:22 am

Presuming you mean 55 amp hrs; multiply by the voltage ie 12 to get watt hrs. Then see what power the motor requires and you can work out an idea of how long the battery will last. Long time since I did this stuff so check it with somebody who is more current!

PS if too much power is drawn too quickly the battery will get hot, not much of a heat sink in a small battery!

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Re: Easy Pre-inflation ideas

Postby Peter_Frank » Sun Apr 23, 2023 11:09 am

artificialname wrote:
Sun Apr 23, 2023 1:02 am
Smeagle wrote:
Fri Apr 21, 2023 1:33 pm
Janus wrote:
Fri Apr 21, 2023 1:02 pm
Do a 6 o clock start, it has a name I don’t want to mention. Hot launch.

I use a bilge-pump too. It's small and I use an electric pump for pumping LEI too, so I have that Battery already... I really see no real alternative to that...

If I buy a $30 bilge pump that is listed as "12v" could I expect it to operate with one of these:


They have 55amps

No.

If a bilge pump draw 1.6 Amps, and you have a 55 mAh 12 V battery (the Energizer A23 you show), then even in the perfect easy to calculate world, it would only last 2 minutes till flat.

But because the voltage drops, AND the capacity drops hugely at higher currents, my estimate would be it would last less than half a minute :roll:
The internal resistance of this battery which consists of eight 1.5 V batteries, can total be several ohms or more, meaning when you draw 1.6 Amps, you might not get anywhere near 12 volt out.
Also, because of this resistance the battery might overheat.
These batteries are most often used in very low mA devices, one or two digit mA max.


A 12 V car battery is typically 50 Ah which is 50000 mAh, and inner resistance only 0.02 Ohm, more than 100 times less than the Energizer, so a car battery is made for high currents.
Here you can use the bilge pump with 1.6 A for more than 30 hours, a totally different ballgame.

8) Peter

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Re: Easy Pre-inflation ideas

Postby Smeagle » Sun Apr 23, 2023 1:44 pm

If you don't own batteries and charges already, it may be a bigger problem... I am doing RC model flying, so I have batteries and chargers.

I use this battery for my SUP/Kite Pump and for that blower:

https://hobbyking.com/de_de/turnigy-hig ... -xt60.html

If you only need it for this blower, a smaller battery would be fine. You will need ~2000mAh to run it one hour. It pulls less than the 2,5A it is rated for.

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Re: Easy Pre-inflation ideas

Postby Herman » Mon Apr 24, 2023 2:10 pm

I have been getting good service from a Yucel Y7-12, 12v 7.0Ah C20. Valve regulated lead acid battery. Probably sold as an alarm system battery. Needs sensible handling but reasonably robust, I have been impressed with how well it hold charge when not in use. It has been used with kite-camping gear compressor and tyre inflation compressor. Need to fit your own fuse and 12v socket in some sort of box.
Last edited by Herman on Mon Apr 24, 2023 2:34 pm, edited 1 time in total.


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