Another recording of the pair of PT-22 Recruits based at Old Warden. I was contact by a guy from the US who actually flies one of these in his spare time asking for me to send him some recordings, which of course I have.
The PT-22 Recruit was the first trainer aircraft to be used by the United States Army Air Corps with a single wing (monoplane). Powered by a single Kinner R-5 Raidial. The aircraft has a peculiar sound due to a odd arangement of exhausts and cylinders (a high speed waltz?).
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Heres a photo I took of one of the displaying aircraft during the display on the day.

Ryan PT-22 Recruit, Old Warden, 2nd August 2009
Recorded on 2nd August 2009, Old Warden, Beds, UK.
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IT certainly does make an unusual sound… a source for one of your compositions maybe?
I tried using aircraft as a basis for some but all I could think of was new-age-synths-birds-and-waterfalls. It is quite interesting to put a few together for a Balbo effect though!
This is one I did a while back, http://www.field-recording.org.uk/produced-composition/, last one.