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).
The methods used to observe and record 'Frame Jellying', supplementing road tests with stationary experiments.
| Identifier | WestWitteringFiles\U\January1930-April1930\ Scan095 | |
| Date | 19th February 1930 | |
| To R.{Sir Henry Royce} From Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} (Held up). c. to Sg.{Arthur F. Sidgreaves - MD} Wor.{Arthur Wormald - General Works Manager} c. to Rg.{Mr Rowledge} E.{Mr Elliott - Chief Engineer} c. to BY.{R.W. Bailey - Chief Engineer} Da.{Bernard Day - Chassis Design} c. to OY. EP.{G. Eric Platford - Chief Quality Engineer} c. to Hm.{Capt. W. Hallam - Head Repairs} MX.{John H Maddocks - Chief Proving Officer} c. to PN.{Mr Northey} ORIGINAL x45? x7386. x7250. FRAME JELLYING. METHODS OF OBSERVATION. To study this [handwritten] phenomenon on the road, necessitates driving at high speed over a bad surface. Even then it is most difficult to judge the effect of small differences as the trouble is very capricious in its behaviour. Suitable roads being scarce locally, such testing has had to be very limited for obvious reasons. We therefore supplemented our road tests by stationary experiments, the front wheels being rotated on drums as shewn on the attached sketch. On the drums were symmetrically disposed projections to represent road inequalities. The drums could be rotated at any given speed and the behaviour of the radiator movement studied at close quarters. We consider that by this means we were able to reproduce radiator jellying exactly as experienced on the road only in a more acute degree, as we were able to maintain indefinitely the road speed at which the phenomenon was most acute, and also apply the "Pot hole" effect at the frequency required to produce the maximum forced vibration. In order to obtain a record of the behaviour of the radiator after each chassis modification, we arranged the Chronograph so that a supplementary pen operated by a wire attached to the radiator cap, drew a full scale picture of the amplitude | ||