Originally Posted by
chevvron
There are some VERY quiet Chinooks around.
Couple of years ago, I was out in my back garden killing slugs at 4.25am when a couple of them went westbound on H3 which passes just north of my home; compared to other Chinooks (we get them frequently to/from Odiham) they were barely audible and this was only from about one mile away.
Same Chinooks - just different atmospheric conditions on the day.