From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
Report comparing the performance data of a worm axle against a bevel axle.
Identifier | ExFiles\Box 2\6\ B002_X 140 141 157-page132 | |
Date | 21th December 1911 guessed | |
WORM AXLE (Contd.) (7) X141 ratio (worm) we had adopted (3.6 to 1) was too low for all practical purposes. The Committee pointed out, however, that an increase in the ratio would undoubtedly increase our difficulties. Mr. Johnson said:- "At a thousand revs. how many miles per hour would be given on the direct drive by this gear, and what is given by our standard gear?" Mr. Platford submitted a report concerning efficiency etc. of the worm axle:- 1. The Worm axle at 25 m.p.h. on the track, rose in temperature from 7 deg. C. to a maximum of 34 degs. C. in 50 minutes. The bevel axle at 25 m.p.h. on the track with the same chassis, rose in temperature from 7 deg. C. to a maximum of 24 degs. C. in 30 minutes. 2. With the worm axle the engine developed 31.2 h.p. at road wheels at 1000 r.p.m. the temperature rose from 10 degs. C. to a maximum of 172 degs. C. in 100 minutes. With the bevel axle the engine developed a maximum of 33.4 h.p. at road wheels at 1000 r.p.m. the temperature rose from 10 degs. C. to a maximum of 50 degs. C. in 60 minutes. 3. With worm axle an engine developed 39 h.p. at road wheels at 1500 r.p.m. With bevel axle the same engine developed 43 h.p. at road wheels at 1500 r.p.m. All tests were taken with Price's "B" Motorine mixed with oil dag. Mr. Platford reported further that the worm axle got more noisy on retard with running. | ||