Quote:
Originally Posted by Skoshi Tiger
The average enviromental lapse rate is about 2 Degrees C per 1000 feet. A nice summers day of lets say 30C at ground level turns into -10C at 20,000 feet.
I think I'ld want a Irvin jacket if I was on Patrol.
Cheers!
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I know, hence the reason many favoured the frock (or in terms of the BoB film, a sweater) It would have been bloody hot in getting into the spit in an Irvin during the battle, and even though it would get bloody cold upstairs many still didn't wear the Irvin. It really restricted movment; wear one and this is clear. It's uncomfortable in a seating position, and the collar is a bitch.
It's a great winter jacket, and great if worn in a bomber, but for a fighter pilot it's an annoyance.
Winter was a period when many RAF pilots wore them, but even then they preferred to layer up...