QANTAS 767 engines
My mate was watching a QANTAS 767 take off from Christcurch recently and wanted to know what was the highly distinctive whine that follows the depature of this said aircraft.( I know its more than the engine noise coz hes smart enough to regognise that) so im just wondering is this 'whine' a part of the aircraft design or is it part of the enginge and if so which brand of engine do the 767's have?
Many thanks
Lindstrim