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).
Testing and assembly specifications for Wraith Ripple No.2 and Wraith III No.4 engine units.
| Identifier | ExFiles\Box 155\2\ scan0321 | |
| Date | 16th May 1939 | |
| -2- WRAITH RIPPLE NO.2 UNIT - Cont'd.{John DeLooze - Company Secretary} (5) Take heat to oil as previously carried out on piston comparison. (6) Carburation tests to be taken as specified by Rm{William Robotham - Chief Engineer}/CTS.{C. Trot Salt - Carburation} (7) Unit to be tuned up in all respects and passed off available for fitting in chassis. WRAITH III NO.4 UNIT. Unit now being assembled with (a) Vandervell big end bearings - 3 in 3-layer material. 3 in Babbit. (b) Split skirt pistons EB.4740 raised crown as produced by Aerolite. (c) Double valve springs. After running in run endurance of 25 hrs. as follows:- Each hour. 30 mins. 4000 25 mins. 4250 5 mins. 4500 Each 10 hours. 7 hrs. full load. 2 hrs. 1/2 load. 1 hr. 1/4 load. Run on Mot.'C' at oil inlet temp. 100°C. | ||