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).
Pressure test results for the Wraith III Damper Control Unit.
| Identifier | ExFiles\Box 9\8\ 08-page31 | |
| Date | 3rd February 1938 | |
| Rm{William Robotham - Chief Engineer}/Les.{Ivan A. Leslie} HPS{Horace Percy Smith - Experimental Factory Mgr}/PH [crossed out] BY/NS.{Norman Scott}11/G.3.2.38. 642 WRAITH 111. DAMPER CONTROL UNIT. The following table shews the pressures obtained when testing the first Experimental Production unit in the Works. The figures given by you are shewn for reference, in the last section. R.P.M. of Spindle. Pressure. Min. Max. Remarks. 400 18 lbs. 30 lbs. Valve adjusting washers set at maximum thickness on drawings. 450 20 " 31 " -------------------------------------------------------------------------------------------------------------------------------- 325 11 30½ Governor Control valve fitted up with .125 thick adjusting washers. 400 12½ 32 450 14 33½ -------------------------------------------------------------------------------------------------------------------------------- 100 1½ 25 Figures supplied 200 4 28 by Rm{William Robotham - Chief Engineer}/Les.{Ivan A. Leslie} 800 8 30 400 12 32 450 14 34 It should be noted that the test rig used in the Works will not permit tests to be carried out on the lower end of the speed range. In order to get the first unit on to the chassis the minimum pressure was set by means of a .125 adjusting washer. Will you kindly investigate this matter, and give us a report, so that our drawings may be modified if necessary. BY/NS.{Norman Scott} NS{Norman Scott} | ||