Super Owl
Density Altitude = Pressure Altitude + (ISA deviation x120)
Just the job. Thanks! I probably did come across something like that a few years back, but if I did I'd forgotten it!
FFF
I wanted it for interest, mostly! Interest brought about by flying in high terrain in an unusually hot summer. Until quite recently, most of my mountain flying had been done in the autumn or winter. Recently, we've often had temperatures which are ISA+20°C or greater. It was starting to become hard work to fly over passes that used to be easy. Got me wondering about what the density altitude might be on those hot days.
From calculating it "properly" it turned out on some days that the density altitude at 10,000ft was over 13,000ft - at which altitude the non-turbocharged engine I fly behind doesn't want to climb any more!
I don't check the graphs before takeoff, because the runways I use are long enough and sloping. I'm not brave enough to try using the shorter sloping ones on a hot day, 'cos the turbulence is so bad that I'd probably miss the runway altogether...
