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).
Fuel flow tests and hot starting performance on gradients for 25/30 and Wraith cars.
| Identifier | ExFiles\Box 102\3\ scan0212 | |
| Date | 10th August 1938 | |
| -3- with the 25/30 pipe no fuel flows through No.4 port right up to the extreme condition of a 1 in 3 gradient. At this gradient no fuel is flowing through the ball drain, hence a blocked drain valve cannot produce flooding in the rear cylinders. Two Wraith pipes were tested. With each of these, fuel commenced to trickle through No.4 port on gradient of 1 in 9 1/2. In each case flow commenced after fuel had ceased to flow from the ball drain, and the flows were very small, not exceeding 1 pint/hour. HOT STARTING ON GRADIENTS. Both 25/30 and Wraith cars take about the same time to start (3 to 5 seconds) when hot and stopped on a gradient of 1 in 7 1/2 and require the throttle opening. Wraith will idle although strong, but the 25/30 will not do so as it is flooding in this condition. Rm{William Robotham - Chief Engineer}/GR.{George Ratcliffe} | ||