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).
Modifications to the DC 42 idle system to cure spitting on the overrun.
| Identifier | ExFiles\Box 93\2\ scan0216 | |
| Date | 18th November 1937 | |
| IDLING AIR SCREW REPLACED WITH PH III BLANK BLANK OFF SMALL SYPHON HOLE. ON OLDER TYPE IDLE PASSAGE DIA. TO BE REDUCED FROM .145" TO .100" P III METERING SCREW IDLE DISCHARGE HOLE ENLARGED TO .046" METERING SCREW HOLE MAY REQUIRE TAPPING 2 BA IN ORDER TO GIVE A FULL RANGE OF MOVEMENT TO THE SCREW. MODIFICATION TO DC 42 IDLE SYSTEM TO CURE SPITTING ON THE OVERRUN. FLOAT CHAMBER GASKET - MODIFICATION OF L 720 P III METERING SCREW AND SPRING TO 1168 AND 1177 DRILLED .055 SIZE 170# IDLE JET TUBE. MODIFICATION OF P 17007 ROLLS-ROYCE, LTD. PRINT ROOM 18 NOV 1937 DERBY. | ||