A 3-view line drawing of the Bell HSL-1.
Bureau of Aeronautics, Navy Department
<a rel="nofollow" class="external free" href="http://www.alternatewars.com/SAC/HSL-1_SAC_-_1_September_1952.pdf">http://www.alternatewars.com/SAC/HSL-1_SAC_-_1_September_1952.pdf</a>