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).
Blueprint of the leading dimensions for a Bentley supercharger.
| Identifier | ExFiles\Box 140\1\ scan0081 | |
| Date | 6th December 1934 | |
| SUPERCHARGER FOR BENTLEY (LEADING DIMENSIONS) TO DELIVER 25 LBS. OF AIR PER MIN + FUEL AT 12" HG. BOOST AT 6.25 x 4000 R.P.M. (2.0 CARB DEPN) ALTIVE. FOR COUNTER-CLOCK ROTATION. 16 BLADES EQUALLY SPACED 3.350 P.C. DIA 5.121 R .050 RAD 12 VANES EQUALLY SPACED CLEARANCES TO CASING HERE NOT MORE THAN .015 IF POSSIBLE SCALE 1/1 VOLUTE DIAS AT VARIOUS ANGLES. SCALE 1/2 2.000 360° 0° 1.884 320° 1.762 280° 1.632 240° 1.490 200° 1.333 160° 1.154 120° .942 80° .668 40° 2.500 AIR INLET DIA. RAD. AT LEADING EDGE. INLET GUIDE RADIAL VIEW TOWARDS AXIS BLADE BENT THUS. (FOR CLOCKWISE ROTATION) ANGLES AT EDGE FOR VARIOUS RADII FROM AXIS. TABLE: RAD | ANGLE 0.500 | 25° 40' 0.750 | 36° 20' 1.000 | 44° 30' 1.250 | 51° 0' STAMP: ROLLS-ROYCE LTD PRINT ROOM 7 DEC 1934 DERBY HANDWRITTEN: A.L.N. 6.12.34 | ||