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).
Test report on the pressure time lag between a Governor Pump and a Damper using compressor oil.
| Identifier | ExFiles\Box 179b\2\ img226 | |
| Date | 23th December 1932 | |
| -5- Hs{Lord Ernest Hives - Chair}/Pm.1/KT 23.12.32 Pressure - Time lag between Governor Pump and Damper using compressor oil and 1/4" dia. 12 ft. pipe line. | Pump. Speed. R.P.M. | Pump. Press. Lb/sq.in. | Damper. Press. | Time to build up Press. - Secs. | |---|---|---|---| | | | | Pump Press. from 0. | Damper Press. from 0. | Pump to Damper. | | 128 | 3.5 | 3.5 | 2 secs. | 12 secs. | 10 secs. | | 256 | 11 | 10.5 | 3 " | 14 " | 11 " | | 342 | 17 to 18 | 17 | 3 " | 13 " | 10 " | Time required to pump compressor oil through 1/4" dia. 12 ft pipe - dry - at 300 r.p.m. = 44 secs. We have some hand controlled dampers running about, and it is noticeable how instantaneously they respond to operation, whereas the result of operating the over-riding control on N.Sch. 3468 is not so instantaneous. We think, from the figures, that the pump delivery has a material bearing on the time lag and that therefore it would be unwise to reduce this appreciably. We are proving the point. The effect of the pressure on the ball pin load we have already reported on and is shewn on Hs.{Lord Ernest Hives - Chair}795. The connections used in the tests are shewn in Hs.{Lord Ernest Hives - Chair}792. We shall have some sylphon tubes running very shortly. The glands we are struggling with. We have found it very necessary to 'bleed' the pipes to the shock dampers on the chassis, to remove air, and provision could with advantage be made for this on the dampers. Also care must be taken to avoid running the pipes up and then down again or air will be trapped. Hs{Lord Ernest Hives - Chair}/Rn.{Mr Robinson} | ||