SandMcGroper said...general_dude said...lovey said...
orright, on my third beer and the inner geek is coming out...
<SNIP>
Feeling bored & geeky to.
No expert but feel like blah ing on with what I do know.....
I think ...
<SNIP><SNIP>
In summary: Lower temp should equal more powerful wind, but effect should be pretty small.
Here endith the lesson (until someone who really does know what they're talking about decides to join in!)
You're correct: colder air is denser, so at the same speed as warm air it has a higher energy content and your kite delivers more power. Rain would also contribute to this, as rainwater would increase the average density of the fluid flowing over your kite.
Kite's generate lift in two ways: bernoulli effects and simple wind redirection. The lift described by the bernoulli equation is a function of fluid viscosity; that is, the more viscous the fluid, the greater the drag and lift generated. So as temperature drops, viscocity increase and your kite delivers more power. The difference is going to be slight however. The majority of the difference in kite power comes from the increased density of the fluid.
(This is so unworthy of a poor imitation of me.... You are not ready, GrassMcGroper.

)
Temperature, pressure, density, bernoulli effects




.....sorry, but I beg to differ.
Its the HUMIDITY - the % amount of molecules of water dissolved in the air - that gives air the significantly higher DENSITY it needs to pack a whollop in the wet.
One cubic metre of air at low pressure is, by definition, less dense than air at high pressure at the same volume, humidity and temperature. "Density" ordinarily depends on pressure, temperature, volume and humidity. It depends also more on WHAT is held in solution by the air - be it water vapour, rain, ice, snow, smoke, pollution, or cats and dogs. Pollution will increase air density, and can increase air density well beyond 100% humidity levels. A Volcanic eruption can lead to astonomical air densities.
Therefore kiting in volcanic smoke would be a lot easier than in a snowfall, but you'd be "Smokin'" in more ways than one.
Generally though, DRY air is much less windy than WET or HUMID air, because WET air, just like anything else that gets WET, is a lot heavier (or more DENSE) than clean dry air.
Air that is below 0 degrees is driest and usually @ 0% humidity. At 100% humidity, water comes out of solution. We usually call this Rain, but it may simply form cloud depending on air pressures, temperatures and other atmospheric effects.
Weather is a very very very very very very very complex subject so all ignorance is excused. ANU have just spent a staggering $30 Million of our money to setup a Sun Computer to model weather. Its the most advanced system south of the equator.
Some one ought to tell 'em Seabreeze has already got the weather solved...
You just ask Laurie.

Speaking of which, thanks for the green arrows this weekend, Laurie!