Keywords: Bell L-39.jpg One of two highly modified P-63Cs made for testing low-speed and stall characteristics of transonic and supersonic wing designs The L-39 had 35-degree swept wings The first L-39 was later taken to NACA at Langley where it was used for wind tunnel tests Transferred from http //en wikipedia org en wikipedia; transferred to Commons by User Rcbutcher using http //tools wikimedia de/~magnus/commonshelper php CommonsHelper Original uploader was Binksternet at http //en wikipedia org en wikipedia 2007 10 03 original upload date ~ 1946 US Government PD-USGov Original upload log page en wikipedia Bell_L-39 jpg 2007-10-03 15 25 Binksternet 515×263× 40633 bytes <nowiki>One of two highly modified P-63Cs made for testing low-speed and stall characteristics of supersonic wing designs The L-39 had 35-degree swept wings The first L-39 was later taken to NACA at Langley where it was used for wind tunnel tests It was then g</nowiki> Experimental aircraft of the United States Bell P-63 Kingcobra |