Hawker Siddeley 4 bladed metal propeller, with propeller control unit, propeller synchrophase computer and associated component
Hawker Siddeley 4 bladed metal propeller for use with R.R. Tyne Engine (Vanguard aircraft) cropped, with propeller control unit (P.C.U.), propeller synchrophase computer (P.S.C.) and associated component, by Hawker Siddeley, England, United Kingdom, 1935-1977