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).
Graph comparing pilot jet area and opening against needle turns for various jet configurations.
| Identifier | ExFiles\Box 66\3\ scan0224 | |
| Date | 27th December 1927 | |
| PILOT JET OPENINGS JET AREA SQ INCHES .003 .0025 .002 .0015 .001 .0005 ANNULAR JET OPENING INCHES .016 .014 .012 .010 .008 .006 .004 .002 TURNS OF NEEDLE FROM CLOSED POSITION 0 1/2 1 1 1/2 2 JET AREA PILOTTED JET SPFLD JET AREA PILOTTED JET ENG JET OPENING PILOTTED JET SPFLD JET OPENING PILOTTED JET ENG SPRINGFIELD JET AREA ENGLISH JET AREA JET AREA OLD NEEDLE SPFLD JET AREA OLD NEEDLE ENGLAND JET OPENING OLD NEEDLE SPFLD JET OPENING OLD NEEDLE ENGLAND EUGENE DIETZGEN CO. CHICAGO-NEW YORK NO. 346 B X RECEIVED DEC 17 1928 ay DEC 27/27 | ||