Comparison of buffer clearance specifications for the standard 40/50 HP chassis and the EAC.111 chassis.
| Identifier | ExFiles\Box 54\3\ Scan168 | |
| Date | 20th November 1924 | |
| Hs {Lord Ernest Hives - Chair} /ACL/LG20.11.24. BUFFER CLEARANCE ON EAC.111. STD. 40/50 CHASSIS. Free camber = 3.500". Camber when loaded = 0. Load = W. Rating = W/3.5 in/lb. Buffer clearance = 2.200". Additional load to bring spring up to buffer = W/3.5 X 2.2 = .63 W (nearly). EAC.111. CHASSIS. Free camber = 2.6". Camber when loaded = .5 Total deflection under load = 3.1" Load = W (same as for std. 40/50 HP.) Rating = W/3.1 Buffer clearance = 1.550" Additional load to bring up to buffer = W/3.1 X 1.55 = .5 W The spring will come up against the buffer for less load ( approx. 20% less) than in the case of the 40/50 HP. CLEARANCE NECESSARY TO BE EQVT: TO 40/50 CHASSIS. S = Clearance required. W/3.5 X 2.2 = W/3.1 X S. S = 3.1/3.5 X 2.2 = 1.95. Clearance necessary = 1.95" Hs {Lord Ernest Hives - Chair} /ACL. | ||
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).