11-13-2007, 03:36 PM
Aviation, now we are talking my language. (20 years at Boeing in military modification.) I'm neither pro nor con , just want to offer some information.
Darl, idea here: can you post pics so you aren't the bad guy for every helicopter that flys?
The green harvest birds seemed to fly at full low pitch since hey it wasn't their cash. Full low pitch burns more fuel and is louder because it displaces more air. A commercial operation would seldom do that due to fuel costs.
Also just some info , and again Darl correct me if I'm wrong - since the birds have been over our jobsite the last week or so (not that we notice them much over power tools) - in windier conditions, pilots tend feather the rotors out to to change the pitch and speed of the rotors to make the aircraft more stable and make it more comfortable for the passengers. And depending on air temps, how high the inversion layer is (usually where the clouds are and flatten out and go across) will affect how sound is reflected down. Colder, air above is much denser and reflects sound better. Much like a stereo speaker pointed against a wall makes more sound than pointed towards an open yard.
on the bright side, we should be very thankful we don't have B-1B bombers or f4 or F-16 taking off day and night. Aircraft that generate real noise.
-Bob
PS if anything is spelled incorrectly, I dictated this to my lovely assistant - she said it is too painful to watch me type.
Edited by - seasidebob on 11/13/2007 22:07:29
Darl, idea here: can you post pics so you aren't the bad guy for every helicopter that flys?
The green harvest birds seemed to fly at full low pitch since hey it wasn't their cash. Full low pitch burns more fuel and is louder because it displaces more air. A commercial operation would seldom do that due to fuel costs.
Also just some info , and again Darl correct me if I'm wrong - since the birds have been over our jobsite the last week or so (not that we notice them much over power tools) - in windier conditions, pilots tend feather the rotors out to to change the pitch and speed of the rotors to make the aircraft more stable and make it more comfortable for the passengers. And depending on air temps, how high the inversion layer is (usually where the clouds are and flatten out and go across) will affect how sound is reflected down. Colder, air above is much denser and reflects sound better. Much like a stereo speaker pointed against a wall makes more sound than pointed towards an open yard.
on the bright side, we should be very thankful we don't have B-1B bombers or f4 or F-16 taking off day and night. Aircraft that generate real noise.
-Bob
PS if anything is spelled incorrectly, I dictated this to my lovely assistant - she said it is too painful to watch me type.
Edited by - seasidebob on 11/13/2007 22:07:29