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).
Test report on the failure of a 2nd motion shaft in a gearbox following dynamometer testing.
| Identifier | ExFiles\Box 98\4\ scan0109 | |
| Date | 5th July 1939 | |
| To [Redacted] from HPS{Horace Percy Smith - Experimental Factory Mgr}/RH.{R. Hollingworth} c.c. [Redacted] c.c. Rm{William Robotham - Chief Engineer}/Gry.{Shadwell Grylls} c.c. [Redacted] c.c. [Redacted] Hood. +666 HPS{Horace Percy Smith - Experimental Factory Mgr}/RH.{R. Hollingworth}4/BA.5.7.39. 9.B.V.Gear Box in 30.G.VII Chassis. Failure of 2nd Motion Shaft. GB.4817. This box has run 202 miles on road test, and 129 hours 5 minutes on Dynamometer, which consisted of 1 hour 2,000 r.p.m. 1st gear, full throttle with 720 lbs lift, 9 hours 2,000 r.p.m. 2nd gear, 530 lbs lift, and 15 hours 50 mins. 2,000 r.p.m. full throttle 2nd gear, 540 lbs lift when 2nd speed driver gear shed 2 teeth. The box then ran 100 hours on overdrive at 2,000 r.p.m full throttle 310 lbs lift and 3 hours 15 mins on 1st gear 2,000 r.p.m. with 2nd gear load of 540 lbs, the constant mesh gear on 2nd Motion Shaft then shed 3 teeth as shewn on the attached photograph. HPS{Horace Percy Smith - Experimental Factory Mgr}/RH.{R. Hollingworth} RW | ||