A Del Mar DH-1A <i>Whirlymite</i> helicopter is demonstrated for U.S. Navy  helicopter pilots at Ellyson Field, Pensacola, Florida (USA), circa 1965. The platform prevented flights over 1 m.<br>The Del Mar Engineering Laboratory was a designer and manufactuerer for weapons system support and training systems at Los Angeles, California (USA). It produced a series of experimental ultralight helicopters as well as a helicopter training system between 1940 and 1974.
U.S. Department of Defense
circa 1965 <div style="display: none;">date QS:P,+1965-00-00T00:00:00Z/9,P1480,Q5727902</div>
<a rel="nofollow" class="external text" href="http://www.navy.mil/ah_online/department_arch.html">U.S. Navy All Hands magazine</a> <a rel="nofollow" class="external text" href="http://www.navy.mil/ah_online/archpdf/ah196503.pdf">March 1965</a>, p. 36.