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A fly past by Chetak helicopters at the passing out parade of 82nd helicopter pilot conversion course held at INS Rajali, Naval Air Station Arakkonam near Chennai today.
 
^^^ Any helicopter pilot here? Just want to ask - what is that 'bell-like-trill ringing' sound that one hears from the Chetaks ? @Abingdonboy @Windjammer

That is the high-pitch of the turbine engine; its characteristic of the Chetaks. Compare that sound with other Helos, esp the Bells which are more like 'whup-whup'. Even the Mils sound different.
The Dhruvs are far more lower pitched in comparison.

I think its not weapon bay, its Sonar Buoy bay.. It will drop SONAR in open water, The Sonar will read Submarine signal are relay to P8....


That is in fact the Weapons Bay with the doors open. The Sonobuoys are launched out of the chutes (circular openings) further aft of the Weapons Bay. Look closely again at the picture.
 
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