1. BS ISO 5109. Evaluation method for the resonance frequency of multi-copter UA by measurement of rotor and body frequencies. (10th August 2022) Authors: British Standards Institution, Record Type: Book Extent: 1 online resource (15 pages) View Content: Available online (eLD content is only available in our Reading Rooms) ↗
2. Methods of numbering propulsion units and components and describing their direction of rotation. (31st August 1977) Authors: British Standards Institution, Record Type: Book Extent: 1 online resource (6 pages) View Content: Available online (eLD content is only available in our Reading Rooms) ↗
3. Specification for mahogany for use in airscrews. (2nd October 1952) Authors: British Standards Institution, Record Type: Book Extent: 1 online resource (5 pages) View Content: Available online (eLD content is only available in our Reading Rooms) ↗