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).
Bumping test of the rear of a chassis to test the forward frame brackets of the rear springs.
| Identifier | ExFiles\Box 80\3\ scan0016 | |
| Date | 25th February 1914 | |
| From Exp. Dept. Copies for: J.{Mr Johnson W.M.} R.{Sir Henry Royce} Da.{Bernard Day - Chassis Design} Na.{Mr Nadin} Wor{Arthur Wormald - General Works Manager}/Hy{Tom Haldenby - Plant Engineer}20/L25214. February 25th. 1914. Report on bumping test of rear of chassis to test the forward frame brackets of the rear springs. F4273 - X.879 A frame was built up and fitted with axles etc. It was loaded and the back wheels were run on the bumping machine. 3" humps were used run at 105 revs. per min. Palmer tyres were fitted and used at 80 lbs pressure. Rear Springs with few thick plates F4038 and F4035 were fitted. After running 6 hours 25 minutes the following parts were found broken. Cross Member in front of gear box F586 had both off and near side flanges broken. Breakage commences at top. Cross member behind gear box had bolts loose in off side flange. F311 F866 The small cross member which carries the back end of the torque ball draw bars had both end flanges broken. [Handwritten annotations on diagram] Top lug broke here on both sides Bottom flange broke here off side The shocks to the frame and fittings is much worse when bumping the back wheels than when bumping the front wheels. In one case the rigid torque tube transmits the | ||