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.
US Government
circa 1946 <div style="display: none;">date QS:P,+1946-00-00T00:00:00Z/9,P1480,Q5727902</div>
Transferred from <span class="plainlinks"><a class="external text" href="https://en.wikipedia.org">en.wikipedia</a></span> to Commons by <a href="//commons.wikimedia.org/wiki/User:Rcbutcher" title="User:Rcbutcher">Rcbutcher</a> using <a href="https://iw.toolforge.org/commonshelper/" class="extiw" title="toollabs:commonshelper/">CommonsHelper</a>. Original uploader was <a href="https://en.wikipedia.org/wiki/User:Binksternet" class="extiw" title="en:User:Binksternet">Binksternet</a> at <a class="external text" href="https://en.wikipedia.org">en.wikipedia</a>  3 October 2007 (original upload date)