Re: ®Heavy®winter winds.
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ask an airline or a glider pilot
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...or even your local friendly jellyflopper pilot. I wasn't going to jump in here and start banging on about temperature effects on density and how it affects helicopter performance as it would be fred drift, but seeing that you almost mentioned it!
Putting in technically... in a small low powered piston jobby, one has to gently inform a potential biffamongous passenger that they may be too lardy to get off the ground on a hot summer day.
Part of this is to do with engine performance, and part to do with the air being somewhat thinner than on a cold frosty day.
The pilots' manuals have some wonderful graphs that show it all - plotting air pressure, temperature and passenger excess fat.
I expect there are similar limitations to the pilots flying the big boys toys in EyeWrack with 30 beefy troopers in the back.
Andersen 22. The best winch never made.