Comparison of fuel flow rates for the 25/30 and Wraith models under level and gradient conditions.
| Identifier | ExFiles\Box 122\3\ scan0075 | |
| Date | 10th August 1938 | |
| -2- Rm {William Robotham - Chief Engineer} /GK.19/JH.10.8.38. A B 25/30 WRAITH. pts/hr. pts/hr. Max. free flow from pumps. 160 240 Car on level road. Flow through ball drain. 4.0 12.0 Flow from drain in top of lid. {A. J. Lidsey} 89.5 124.0 Flow down pump spindle. negligible 1 drop in 4 secs. When the ball drain is stopped fuel runs through No.3 port in each case, at a rate of 4.0 12.0 Car on 1 in 3 gradient. Flow through ball drain. 0 0 Flow from drain in top of lid. {A. J. Lidsey} 77.2 124.0 Flow through No.3 port. 8.7 9 No.4 port. 0 1 * These figures of 9 and 1 pt/hr. for flows through Nos.3 and 4 ports respectively are only approximate. Since the floor of the pipe is flat any slight variation in its surface will give slightly varying results with different pipes. A 25/30 B WRAITH. 1st. pipe 2nd.pipe Fuel commences to flow through No.3 port on a gradient 1 in 9 1 in 5.25 1 in 8.8 Fuel commences to flow through No.4 port on a gradient No fuel 1 in 3.5 1 in 3.5 flows. Fuel ceases to run out of ball drain on gradient. 1 in ) 1 in 4.15 1 in 6. Under normal conditions, carbur- etter commences to flood on 1 in 14½ 1 in 7½ gradient. | ||
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).