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).
Comparison table of specifications for Falcon XI and Condor aero carburettors.
| Identifier | WestWitteringFiles\S\March1928-May1928\ Scan109 | |
| Date | 12th April 1928 | |
| 12-4-28. COMPARISON OF AERO CARBURETTORS. PARTICULARS. | FALCON XI S/C CARBS. | CONDOR. VARIATION IN PETROL LEVEL FROM 18 INS. TO 12 FT. HEAD. SECTIONAL AREA OF FLOATS AT PETROL SURFACE (18 INS. HEAD). | *9.60 SQ. INS. | 9.75 SQ. INS. VOLUME OF SUBMERGED PORTION OF FLOATS. (18 INS. HEAD). | *9.71 CU. INS. | 17.40 CU. INS. AREA OF NEEDLE VALVE ORIFICE. | .0926 SQ. INS. | .1104 SQ. INS. AREA OF NEEDLE VALVE SEATING | .0976 SQ. INS. | .1194 SQ. INS. MAXIMUM FLOW THROUGH CARBURETTOR (18 INS. HEAD) | 360 PTS/HR. | 434 PTS/HR. MAXIMUM LIFT OF NEEDLE VALVE | .080 IN. | .150 IN. NEEDLE VALVE LIFT WHEN PASSING 400 PTS/HR. (MAX. CONS.) | | .070 IN. FALL IN PETROL LEVEL WHEN PASSING 400 PTS/HR. | (FLOAT CHAMBER EMPTY). | .410 IN. FLOAT CHAMBER CAPACITY (18 INS HEAD). LEVERAGE RATIO (FLOAT MOVEMENT. / NEEDLE VALVE MOVEMENT.) | 3.435 | 4.450 * TOTAL VALUE FOR BOTH FLOATS. | ||