Comparing the deflection and stiffness of an existing 6' frame with a proposed 8' frame.
| Identifier | ExFiles\Box 75\3\ scan0286 | |
| Date | 7th January 1914 | |
| re Frames. X1045 J. {Mr Johnson W.M.} for R. {Sir Henry Royce} 7.1.14. Da {Bernard Day - Chassis Design} 4/07114. In reply to your notes R1/P121213, R6/P231213, I send a print of F.4539, showing the 8" frame (without ties), springs shortened to 48", axle pushed back 6 1/2" and frame lengthened 3 1/2", the spring centre swivel going back 9" (because the spring is shorter) All this stiffens up the cantilever rear end, and the proportional figures are - Deflection of cantilever rear end- Existing 6" channel .0000871 W. do. do. stiffened with D.B.Fitting. .0000577 W. Proposed 8" channel .0000337 W. In the centre the new frame is not so stiff:- Comparative maximum deflections (from previous load diagram.) Existing 6" with tie rods .094" " " without " " .316" Proposed 8" without tie rods..216" If no tie rods were used with the 8" frame, there would be a saving of weight of 5 lbs. per side member over the existing frame and ties. | ||
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).