Compressor and pressure tests, investigating air bottle volume and oil performance in pipe lines.
| Identifier | ExFiles\Box 56\1\ Scan248 | |
| Date | 23th December 1932 | |
| -4- given below, which shew that increasing the volume of the air bottle eliminates the trouble. | | Compressor. | Lockheed. | | :--- | :--- | :--- | :--- | :--- | | Pump Speed R.P.M. | Pump Pressure lbs/sq.in. | | | | | | Standard. Air Bottle | Std.+ V1. Air Bottle | Standard. Air Bottle | Std.+ V1 Air Bottle | | 128 | 3½ | 3½ | 2½ to 3 | 2½ | | 256 | 10 to 10½ | 10½ | 9½ to 11 | 9½ to 10 | | 342 | 17 to 18 | 18 | 16 to 19 | 18 to 19 | Additional air bottle capacity V1 = 2.89 c.ins. Standard capacity = 15 ccs. = .916 c.ins. From these figures we do not think that we shall need the modification to N.sch. 3592. We next investigated the lag between the governor pressure and the pressure built up in the controlling element in the shock absorber (not the ball pin load). We found that the lag was very considerably increased with thick oil. Relative pressures using Motorine C. & ¼" dia. 12 ft pipe line. | 1 Road Speed M.P.H. | 2 Damper Press. | 3 Pump Press. lbs/sq.in | 4 Release Press. | 5 Time of Press. Rise. Secs. Pump to damper From O to Press. in Col.2 | | :--- | :--- | :--- | :--- | :--- | | 30 | 7½ | 8 | 6 | 33 | | 60 | 15 | 16 | 11 | 30 | | 80 | 22 | 23 | 18 | 26 | Time required to pump Motorine C. through 12 ft. pipe line - dry - at 200 r.p.m. = 1½ mins. The figures for the compressor oil with ¼" pipes are not as good as we should like. | ||
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).