Someone else just informed me of Jim's calculator as well (http://jimbodouglass.blogspot.ca/2011/0 ... lator.html).Peter_Frank wrote:It displays the effect of the wind squared quite well
But might be a bit difficult for many, to use when just "numbers" ?
I made a similar thing, where the apparent wind is taken into consideration (as is ALWAYS the case), three years ago:
viewtopic.php?f=1&t=2368840&p=721494
Then one can always change relative to his/her own specific kite, typically by using another personal weight.
I dont see much use for such a graph, at least now when out often and experienced.
But for the upper extremes it can be helpful sometimes, and some medium experienced has advantage of seing how it works.
Of course, the very low end sizes are not "accurate" as such, because special boards and wind shear etc matters a lot - but still, a good overall impression about how wind speed and kite sizes are connected
Peter
Mine wasn't setup to take rider weight, board size, or skill into account. It assumes you have at least one data point for yourself and then you can work from there. I believe Jim's spreadsheet (linked above) does what you're looking for though.edt wrote:not a real useful chart too many numbers.
Can you redo it like this?
175 pound rider on a 12 meter kite is considered the default
Now what is the kite size for equivalent power for kite speed in 15, 25, 30 knots
Now what is the kite size for equivalent power for 200 pound rider in 15,20,25,30 knots
And the same for a 150 pound rider.
That would be a more intuitive way to display the information.
It doesn't do what I'm looking for. Not unless I have a calculator, and if I have a calculator I can just multiply v^2 mass and kite size myself, don't need the spreadsheet.taiguy wrote: Mine wasn't setup to take rider weight, board size, or skill into account. It assumes you have at least one data point for yourself and then you can work from there. I believe Jim's spreadsheet (linked above) does what you're looking for though.
u r right UKSurf, 10m kite has twice the power of a 5 meter kite. He also has wind speed wrong, he's got them going as the cube or v^3 which is incorrect. v^3 is only true for wind turbines but not for kites. For wind turbines when the wind doubles in speed the turbine also spins twice as fast. This is why instead of v^2 a turbine gets v^3. Kites feel v^2. I might make a chart in the format I mentioned previously after I get back from vacation.UKSurf wrote:Why does a 10m kite have 4x the power of a 5m in your first chart? I would think it would have 2x approx. also the power seems to be increasing with the power of 4 not power of 2. We need Bill Hanson to confirm these figures before they are used to purchase a quiver
I haven't seen any information that would corroborate edt's claim.UKSurf wrote:Why does a 10m kite have 4x the power of a 5m in your first chart? I would think it would have 2x approx. also the power seems to be increasing with the power of 4 not power of 2 for wind speed. We need Bill Hanson to confirm these figures before they are used to purchase a quiver
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