Propellor tests and jet assisted planes. America.
Unissued / Unused material.
Title - 'Progress in aviation'.
New propellor tests, and jet assisted take off. United States of America (USA).
LS two men inspecting propellor. MS pilot in cockpit. MS a locked propellor. LS plane taking off. LS air to air shots plane in flight, propellors start whirring. MS jet assisted plane taking off. CU pilot's hands at controls. MS jet assisted plane taking off.
Cataloguer's note: American commentary.