Jul 13, 2017 #1 Zipper730 Chief Master Sergeant 4,320 947 Nov 9, 2015 I'm curious when NACA started working with contra-rotating propellers?
Jul 14, 2017 #2 W wuzak Captain 8,184 2,721 Jun 5, 2011 Hobart Tasmania Curious why you didn't trying search NACA records. I got a result in less than 2 minutes!
Jul 14, 2017 #3 swampyankee Chief Master Sergeant 3,954 3,106 Jun 25, 2013 No later than 1938. See https://ntrs.nasa.gov/search.jsp?R=...=20&Ntt=contra|rotation%20coaxial%20propeller and https://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/19930081502.pdf
No later than 1938. See https://ntrs.nasa.gov/search.jsp?R=...=20&Ntt=contra|rotation%20coaxial%20propeller and https://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/19930081502.pdf
Jul 14, 2017 Thread starter #4 Zipper730 Chief Master Sergeant 4,320 947 Nov 9, 2015 swampyankee said: No later than 1938. Click to expand... November, 1938 the report reads. There was no research before that evidently.
swampyankee said: No later than 1938. Click to expand... November, 1938 the report reads. There was no research before that evidently.