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).
Tests and results for frame distortion and stiffness on various chassis models.
| Identifier | ExFiles\Box 19\3\ Scan255 | |
| Date | 4th April 1930 | |
| x7772- To Mr. Burton from Oy. c. Hs.{Lord Ernest Hives - Chair} c. Smn. Oy3/DM.{D. Munro}April 4/30. Frame Distortion. ---------------- Reply to Btn 1. March 5/30. This process of measuring frame distortion when carried out comparatively on P.I chassis of various vintages and on P.II chassis should be useful in mounting coachwork etc. since any such movement is a forced movement which the body must follow. I think the results should be listed as between various chassis in the simplest possible way. What we really want to know is - Twist in degrees per 100 lb.foot torque. Chassis. Clockwise. Counter clock. P.I (1701-2500) (Front axle line to dash - - (Dash to rear axle P.I (2501 & on) (Front axle line to dash - - (Dash to rear axle P.II(without ) (Front axle line to dash - - (subframe) (Dash to rear axle P.II(with ) (Front axle line to dash - - (subframe) (Dash to rear axle Rm{William Robotham - Chief Engineer}'s tests on radiator jellying, which you have probably read, but which I return herewith, show that a great deal more enters into the question of frame jellying, snatching and wandering steerings, etc. than the items so far considered. For example, present indications appear roughly as follows:- Frame stiffness. An exceptionally stiff construction of the whole frame and subframe mounting is worst for jellying, i.e. vibrations more persistent due to lack of damping, though of less amplitude. This bears out what we found when we made a trial 4 point engine mounting on two P.I cars. cont'd.{John DeLooze - Company Secretary} | ||