Lock, C. N. H.; Bateman, H.; Nixon, H. L.
(H. M. Stationery Office, 1934-10)
The main series of tests of the original family of airscrews described in R&M 829 consisted of measurements of overall thrust and torque on 5 two-bladed and four-bladed airscrews of pitch diameter ratios 0.3, 0.5, 0.7, 1.0 ...