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 tests on a 40/50 chassis with EAC-111.
| Identifier | WestWitteringFiles\L\Jan1924-March1924\ Scan44 | |
| Date | 1st January 1924 | |
| BUMP TESTS ON 40/50 CHASSIS WITH EAC III EXPERIMENTAL REPORT. COPIES TO: R.CJ B. WOR.{Arthur Wormald - General Works Manager} By E.{Mr Elliott - Chief Engineer} DA.{Bernard Day - Chassis Design} EP.{G. Eric Platford - Chief Quality Engineer} P.N. OY. RG{Mr Rowledge} Expl. No. X1331 X9940 REF. Hs{Lord Ernest Hives - Chair}2/LG2.1.24. OBJECT OF TEST. Bumping tests on 40/50 chassis with EAC-111. TESTER. C.H.Parkinson. CONDITIONS. Bumping rig standard test arrangement. SUMMARY OF TEST. Herewith report on bumptest of EAC-111 original type chassis. The points brought out on this test are as follows :- (1) There were serious steering failures until we removed the radius rods and the modified steering parts. (2) The average life of top leaf of front springs is very poor - Firths being slightly worse than Woodheads. (3) The average life is not seriously affected by anchoring the rear end of front spring - the position of the fractures does not alter. (4) We used a temporary bracket for fixing rear end of front springs made from a solid forging with stiffener pieces on inside of frame. We used 3/8" bolts for fixing it - 3 of these bolts broke also the bottom flange of the frame cracked at this point. We doubt whether the pressed sheet metal bracket which it is intended to use for this end, will be strong enough. (5) We tried Houdaille shock absorbers to see if springs would last longer, but there was no improvement. (6) Lemoines springs definitely last longer Hs.{Lord Ernest Hives - Chair} than either Woodheads or Firths. | ||