Includes letters, reports and memorandums on the following subjects:
- Merlin and Graffon high altitude development, 1943
- future large engine policy, 1945
- study of airscrew theories, 1940
- overspeed spin test of Sabre cooling fan, 1943
- two speed reduction gear, 1942
- analysis of de Havilland propeller production with reference to development troubles, 1944
- future propeller policy, 1944
- propeller development programme, 1943
- future range of de Havilland propellers, 1944 & 1946
- short memo on the history of de Havilland's propeller division, 1945
- functioning of Mosquito "paddle" blades with AY111 units, 1943
- experimental airscrews, 1941
- analysis of British V.P. propeller applications, 1943