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).
Use of tubular cross members to improve chassis stiffness and address vibration.
| Identifier | ExFiles\Box 104\3\ scan0089 | |
| Date | 25th March 1929 | |
| X5380 DA.{Bernard Day - Chassis Design} HS.{Lord Ernest Hives - Chair} BY.{R.W. Bailey - Chief Engineer} R2/M25.3.29. S c. to SG.{Arthur F. Sidgreaves - MD} Wor.{Arthur Wormald - General Works Manager} SS.{S. Smith} AND G4. CROSS MEMBERS. X.7380 X.5380 Your suggestion of trying if we can do better with greater stiffness with the tubular type is good, and Hs.{Lord Ernest Hives - Chair} has gone home with the intention of trying more tubular cross members. One thing occurs to me and that is that certain types or construction of bodywork may increase the rate of natural vibration in the same way as our X. member did, but we shall know it after our experience. Personally I should like all the cross members of the same dia. so as to share the duty economically. Place one where ever you need it, or think it useful, then increase their dia. until we have the desired stiffness, viz: as stiff as possible without getting too near the front axle period with tyres at low pressure. R.{Sir Henry Royce} | ||