Density Altitude.

[GrumpySmurf 0]

A little something I found (more geared for powered aircraft pilots, but useful to know nonetheless), might be of insterest as the mercury and humidity contines to rise across the country.

From iPilot.com
"
For each Fahrenheit degree increase, density altitude increases by roughly 60 feet, or about 1000 feet for each 15 degrees more than standard.
.
.
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Humidity isn't a factor for aerodynamic efficiency, but super-steamy jungle air can reduce reciprocating engine power by 10%.
"

http://www.ipilot.com/learn/article.asp?ArticleID=607

[skydiverbrian 0]

Does that mean it'll be easier for me to go head-down?

In a world full of people, only some want to fly... isn't that crazy! --Seal

[PhreeZone 20]

No... it means that on a super hot day you will have more problems stoping your canopy in a swoop then if you try the same swoop with snow on the ground.

Yesterday is history
And tomorrow is a mystery

Parachutemanuals.com

[GrumpySmurf 0]

That's just Brian being Brian.
From Icarus:
"Faster forward speed, faster decent rate, slower flare effect, and less room for error. It has to fly forward and down faster to generate the same lift - and the faster you're going forward and down, the longer it takes for you flare to have an effect, and the more radically you'll plummet from the sky in any kind of steep turn."

In otherwords, the warmer it gets, the longer the recovery from any sort of dive from a toggle hook, front riser carve or dive. Play safe :)

[diverds 0]

And the airplanes climb much slower as well. At our Cessna dz we generally do not climb above 9500 MSL on days with very high density altitudes. It just takes too long. Last weekend the temperature was about 45 degrees above standard and at 9500 MSL we were getting a climb rate between 100 and 200 feet per minute.

Skydive Radio