Chinook blades
I live in a valley along Red Route 1 in Dorset within which your finest Chinook drivers fly very low level and mostly at night... ive been stumped by the fact that these aircraft can be heard a few miles away as they aproach (in both directions) , even in moderately windy conditions. But lately, the decibels have declined noticeably and the famous wooka wooka noise has now seemigly gone quieter.
Before you all talk about hearing problems/atmospherics... ive been here for over 2 years and have everything fly over with regularity, but the biggest noise change is our friend the Chinook. One went overhead low level last night and wouldnt have known he was there untill 200m away in calm conditions.
New quieter blades for the fleet coming in? or the new model HC3 blades making things quieter? Anyone shed any light or in this case...sound?
Coley.