Dec 17, 2013 #21 J Jugman Airman 1st Class 202 125 Jan 26, 2007 It's an Air Corps report so "American aircraft engines" probably means just that.
Dec 17, 2013 #22 S Shortround6 Lieutenant General 24,125 17,654 Jun 29, 2009 Central Florida Highlands Two more reports. http://www.enginehistory.org/Misc/P161688.pdf http://www.enginehistory.org/Misc/P150137.pdf It seems the US was much more interested in the propeller than the engine and even then interest in the propeller was for test purposes as the US had nothing like it in the way of individually controlled co-ax propellers.
Two more reports. http://www.enginehistory.org/Misc/P161688.pdf http://www.enginehistory.org/Misc/P150137.pdf It seems the US was much more interested in the propeller than the engine and even then interest in the propeller was for test purposes as the US had nothing like it in the way of individually controlled co-ax propellers.