In article , Peter Stickney
writes
For the Rotodyne, noise was a severe problem. (Engine selection
wasn't - Fairey wanted to move to teh Tyne for any later developments)
If the newsreel soundtracks of teh thing I've heard are accurate, it
could only be described as that of a Huey carrying a large, running
Steam Locomotive. Consider this - Rotodyne noise was considered
objectionable during a time when acceptable noise included
unsuppressed straight-jet 707s and the just-proposed Concorde. You
gotta go some to beat them.

Wasn't that just because of the 'city' environment it was expected to
operate in. IIRC PanAm wanted something like 50 for city centre to
airport operations?

--
John