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).
Letter discussing pressure-velocity instruments, shock absorber design, and road spring lubrication methods.
| Identifier | ExFiles\Box 55\4\ Scan348 | |
| Date | 22th June 1928 guessed | |
| - 2 - With regard to your remarks on"pressure-velocity" instruments do you not think that the whole fault with these is that you have reproduced the Houdaille trouble of a resistance which can go up indefinitely with increased oil-velocity? I cannot see how an instrument in which the valve and the trubulence orifices are in series can possibly give anything but jerky riding, both from the jerk when the valve "pops" and the jerk when the pressure rises too high with velocity. It seems to me that for comfort the orifice (or orifices) and the valve must be in parallel, as we do with the leaking valves and as is done in another Am. shock absorber we have fitted called the "Two Way". The orifice effect then causes the pressure to rise gradually as the velocity of the oil increases, while the blow-off valve prevents an excessive restraining effect which could cause discomfort to the passengers or damage to the instrument. I want to thank you and Hm.{Capt. W. Hallam - Head Repairs} for the interesting reports on the effect of excessive interleaf friction in road springs, means of lubrication etc. We are going after this matter hard to try to get both a better bedding between the leaves and methods of lubricating front and rear springs from the Bijur system. Our feeling is that with effective "tip" lubrication and cadmium plating, we hope to get rid of the messy spring gaiters entirely. Do you agree with this? Yours very truly, ROLLS ROYCE, OF AMERICA, INC. Maurice Olley | ||