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PullStrings
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Postby PullStrings » Mon Nov 26, 2018 12:24 am
Gonzolinho wrote: ↑Sun Nov 25, 2018 10:58 pm
The inflateable kite is dead - long live the high pressure inflateable kite
He will have to change his name to PMUH
PumpMeUpHarder
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grigorib
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Postby grigorib » Mon Nov 26, 2018 3:20 am
Toby wrote: ↑Mon Nov 26, 2018 12:05 am
How much pressure the Best Hellfish was designed for?
Was it 12 psi or more?
It made “all of our new kites obsolete” back then, right?
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nixmatters
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Postby nixmatters » Mon Nov 26, 2018 4:28 am
Toby wrote: ↑Sun Nov 25, 2018 10:24 pm
How strong do you have to be for pumping 100 psi ?
It's not just how strong you have to be or what pump diameter you need if you are not that strong. Quick math shows the following:
HP BL kite: 7,5 sq.m | AR 4.2 | 5 struts = ~8,5 l total volume of inflatable parts
LEI hybrid kite: 9 sq.m | AR 4.9 | 3 struts = ~100 l total volume of inflatable parts
As per Boyle's Law: 8.5 l x 100 psi = 100 l * 8.5 psi
This means the same volume of air needs to be pumped in both kites. In the case of the HP kite - with a bicycle or a car tire pump.
Please correct me if I'm wrong in the calculations.
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grigorib
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Boards: Spleene RIP 37, Flysurfer Radical6 138, Flysurfer Flydoor5 XL, Slingshot/Moses/RDB 70/90/101cm masts with 1200/860/800/730/600 kitefoil or 2200/1700/1400 wingfoil wings and 310/230/425 stabilizers, Naish MicroChip 80cm, 36" Woody, Slingshot Dwarfcraft Micro 100, MBS Comp 95x
For sale: Slingshot Turbine 9/13m, 20” Guardian bar, 1700 sq.cm wing/fuselage/stabilizer fitting Moses mast
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Postby grigorib » Mon Nov 26, 2018 4:56 am
Not sure if volume of air pumped in is a right way to approach it.
Pressure is 1 Pa = N/m^2
If diameter is 1/2 of a given one the force on the strut/LE Dacron sock would be 2 times less for the same pressure. For 1/4 of a given diameter the force will be 4 times less. That’s why pumping a 17m to 8psi makes it feel center of LE tight and ends of the struts soft.
With 1/8 of diameter you can pump in 8x pressure and same Dacron and stitching will hold.
That’s how a tiny bike tires are pumped to 100+ psi and larger ones to 30psi
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brunolgx
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Postby brunolgx » Mon Nov 26, 2018 5:47 am
Toby wrote: ↑Sun Nov 25, 2018 10:24 pm
How strong do you have to be for pumping 100 psi ?
You don't need to be strong if like me you use a fridge air compressor to fill an aluminium tank to inflate the kite on the beach and that you refill it when you come back home
There are also electric tyre pumps...
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GregK
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Postby GregK » Mon Nov 26, 2018 6:52 am
Thank you, Bruno, for your hard work to innovate and continue improving inflatable traction kites. Had to chuckle when I read some of the comments, thinking similar things were probably said decades ago by a few windsurfers when they saw your first kites whiz by.
I sincerely hope you receive requests and contracts from some established kite companies to continue refining and enhancing the high-pressure fully-supported concept.
Along with this new concept, I find equally interesting your decision to open-source the intellectual property and avoid the cost and hassles of patenting and then defending the patents.
Please post on this forum when your English version of your book is released, very much looking forward to that.
Last edited by
GregK on Mon Nov 26, 2018 9:29 am, edited 1 time in total.
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tilmann
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Postby tilmann » Mon Nov 26, 2018 8:34 am
Toby wrote: ↑Mon Nov 26, 2018 12:05 am
How much pressure the Best Hellfish was designed for?
Was it 12 psi or more?
It was pumped with a normal kite pump. As much as you could get in. So I think it was aproximately 12 PSI.
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pmaggie
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Postby pmaggie » Mon Nov 26, 2018 10:02 am
Thank you Bruno. I think that at the moment hundreds of questions and list of pros and cons can appear but the great news are that we are in front of the first real innovation in many years. This is really a new concept, not the usual commercial "game changer" that means a bar with new colors or a 10% smaller LE. This is really great, no matter how many time it will take to transform a concept in a commercial product. My impression is that it's not such a long path.
Really astonishing Bruno, my compliments.
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Toby
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Postby Toby » Mon Nov 26, 2018 10:17 am
I wonder which company will be first to produce a kite like that...a small or a big one.
Gonna be interesting for sure!
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Janus
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Postby Janus » Mon Nov 26, 2018 11:07 am
Toby wrote: ↑Mon Nov 26, 2018 10:17 am
I wonder which company will be first to produce a kite like that...a small or a big one.
Gonna be interesting for sure!
You're not interested in a small kite..
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