Differences in Static Pressure
Hi there all
Just a quick question, im currently studying for my PPL, and am currently reading vol4 of the Thom series - Technical, and I have a couple of questions.
Firstly regarding the positioning of the static vent.
quote.. "The alternate source (in an unpressurised cockpit) often taps static pressure from within the cockpit, which is slightly less than outside pressure." Can anyone axplain why this is.
And secondly there is another parograph on why a IAS/TAS indicator using a temp/alt correction scale is only accurate upto apporx 220kts due to the compressibility of air, can anyone explain why this is in simple terms. I understand that this may be a case of RTFM, in which case could someone point me to a link which would explain this. Or if this is not available on the web, which would be a good book to read up on such a subject?
Thanks
NB