Fliers display how safe their new design of plane is by removing one of its propellors.
Unused / unissued material - no paperwork - dates unclear or unknown.
Floyd Bennett Airfield, New York, United States of America.
Views of the Al Core (sp?) monoplane. Two engineers remove one of the planes two propellors to prove that the plane will take off and fly safely with only one of its two engines working. Alan Lockheed (described as a veteran airplane designer and builder) says (according to the voiceover) that no other plane can duplicate this test.
The one engine starts up. The plane takes off and appears to fly quite well with only the one engine working.