Oh my Gawd!!!!
Thank you Rivet gun, for pointing out my typo. Text suitably edited and emboldened in the corrected area. That will teach me to not be a lazy typist and not use 'cut and paste' so much.
Just in case anyone was foolish enough to copy my post, the correction relates to the value of Gamma, for which I used the letter Y (Sorry, no Greek key-board). I stated -
Y = A constant, being the ratio of specific heat of air at constant pressure to the specific heat of air at constant pressure = 1.4
It should have read (as it now does) -
Y = A constant, being the ratio of specific heat of air at constant pressure to the specific heat of air at constant volume = 1.4
Thany you again Rivet Gun,
Regards,
Old Smokey