Notes, graphs, memos and reports relating to engines. Includes:

- Report on 10 hours endurance test of machinery in starboard wing power car of R100

- Report on examination of Vickers designs of two-blade wooden airscrews for R100, with Condor 111 engines in tandem

- Reports on different components and specifications

- Electrical equipment of passenger saloon

- Layout of aft engines

- Progress statement regarding airship machinery, dated 2 November 1926

- Costs of propelling electrical machinery and wireless equipment

- Rules as to lights and signals and rules of the air

- R100 statement of progress to 3 August 1926

- Data for design of radiators

- Notes on the Beardmore diesel engine

- Blank engine contract between William Beardmore and Company Limited and the Airship Guarantee Company Ltd.

- Particulars of schedules