as a manoeuvre to deliberately exert sound pressure upon cattle many miles distant, especially if they are downwind on a cool morning when wind movement is only about 2 or 3 knots; just at about 35 to 40 knots, ease down the lever roll right slowly 15 to 20 degrees, ease up the lever as moving cyclic slightly aft. with practice a loud whop can be cultivated from the '47 and the 22. The usual constant chopping can be found on a good approach descent at about 18", 45 to 50 knots one way to tell if the student is doing things right and you are on the ground listening. at a high speed descent the same control inputs, slightly down on lever rolling slowly right then up slowly on lever, can really startle whatever is close by. RRPM top of the green.
cheers tet
Last edited by topendtorque; 26th Jun 2015 at 11:46.
Reason: spelling - again.