A collection of letters, memos and reports including material on:
- FW 190 climb
- a report on de Havilland propeller activity in World War II, drafted for the Ministry of Aircraft Production's war history project.
- standardisation of propellers
- coupled turbines
- counter-rotating airscrews
- Super hydromatic and rack propellers
- propeller weight and design trends
- airscrews for future high performance aircraft, by A. V. Cleaver and J. Mullin, Report R.110
- miscellaneous propeller aerodynamic calculations, Report R.105
- de Havilland gear driven propeller project, Report R.167
- airscrew performance calculations by K. B. Gillmore, A. V. Cleaver and J. Mullin, Report R.83.