The inability to obtain sufficient load on rear dampers, investigating collapsed bellows and valve spring compression.
| Identifier | ExFiles\Box 11\4\ 04-page207 | |
| Date | 10th February 1933 | |
| x7941 TO Hs {Lord Ernest Hives - Chair} /Rm. {William Robotham - Chief Engineer} From GWH. {George W. Hancock - Head Chateauroux} Hotel de France, CHATEAUROUX(French test region), Indre, France. 19 EX. As reported yesterday we could not obtain more than 70 lbs load on the rear dampers. The chart on Nsch.3468 shows them capable of 160 lbs, this is of course without the release working in the pump. It does not state lbs per sq. inch for this load. We have traced the loss in poundage to the lack of movement of the bellows. The movement as we found it allowed 3/32" compression of the valve spring. The collar preventing any further movement. This gave us a load of 70 lbs. and it was not possible to get any more. To obtain more poundage we have reduced the collar 1/32 giving a total compression of the valve spring 1/4". With this modification we can obtain 105 lbs load at 70 mph. Enclosed find sketch showing the position. Both rear dampers had the same fault. We are getting out a scale of the loading similar to the front. The bellows in the rear dampers must have collapsed. We have not got the figures by us what the length of the bellows were when fitted, but you may be able, from our sketch, to confirm it. REAR DAMPERS. M.P.H. PUMP PRESSURE lbs. sq;inch. DAMPER LOAD Min. Max. N.S. O.S. Min. Max. Min. Max. 10 2 to 3 lbs. 13 40 80 45 80 20 5 16 55 80 60 80 30 7 to 8 15 to 17 65 85 65 85 40 10 " 11 18 75 90 75 90 50 13 21 80 95 80 95 60 16 23 85 97 85 100 70 24 to 25 103 105 80 " " " GWH. {George W. Hancock - Head Chateauroux} G.W. Hancock | ||
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).