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 detailing the rotational directions and helix angles of various engine components.
| Identifier | ExFiles\Box 137\5\ scan0078 | |
| Date | 11th April 1927 | |
| DRAWING NO. SK 140 SEE ALSO THE FOLLOWING OPERATION DRAWINGS IGNITION HEADS - BOTH ANTICLOCKWISE ROTATION WATER PUMP - R.H. CAM WHEEL - L.H. CRANK PINION - R.H. HELIX IDLER - R.H. GENERATOR DRIVE - L.H. OIL PUMP DRIVE - BOTH R.H. CAMSHAFT ROTATION IGNITION DRIVE - BOTH L.H. OIL RETAINER - L.H. DISCHARGE INLET OIL PUMP - STRAIGHT GEARS. IF MADE HELICAL, DRIVER WOULD BE L.H. HELIX; DRIVEN: R.H. HELIX. DRAWN BY: OY TRACED BY: RF CHECKED BY: APPROVED BY: LIMITS: ROLLS-ROYCE OF AMERICA, INC. MODEL: SEC: WEIGHT: DATE: 11/4/27 SCALE: HEAT TREAT: BRINELL: STANTON: MACHINE ALL OVER MACHINE WHERE MARKED ||| TITLE: ROTATIONS OF ENGINE, HELIX ANGLES, &c. MATERIAL: SPECIFICATION: NO. OFF: DRAWING NO. SK 140 | ||