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).
Bar chart comparing the atmospheric temperature at which a car will boil under various cooling and ventilation configurations.
| Identifier | ExFiles\Box 24\4\ Scan322 | |
| Date | 25th November 1924 | |
| ATMOSPHERIC TEMPERATURE AT WHICH THE CAR WILL INEVITABLY BOIL IF DRIVEN FOR SUFFICIENTLY LONG ON FULL THROTTLE AT THE SPEED AND UNDER THE CONDITIONS MENTIONED. JOB No. 281. COLUMN HEADINGS & DESCRIPTIONS (LEFT TO RIGHT): COLUMN 1: Comparison of Various Car Conditions Alteration in Matrix Height Comparison of Advantages to be Gained by Increasing Height of Matrix 40/50 Car. 30 M.P.H. No Ventilation E.A.C. v Standard Tubes Reduction in Efficiency due to Reducing Tube Length by 8 1/2% 30 M.P.H. No Ventilation Value of Degrees of Ventilation 30 M.P.H. 20 1/4" Matrix COLUMN 2: Comparison of Value of Louvres and Shutters and Maximum Ventilation Possible by Removing Bonnet Sides or Top 30 M.P.H. 20 1/4" Matrix Best Shutter Positions. Comparisons of Shutter Positions in Front or Rear of Side Panel. 40 M.P.H. 20 1/4" Matrix Large Shutters 8" x 14.5" Increase of Road Speed. Efficiency of Cooling System at Various Road Speeds 20 1/4" Matrix. 4.8" Tubes No Ventilation COLUMN 3: No Ventilation Fan Value. Relative Dependance of Hispano & 40/50 on their Fans Loured Bonnets 20 1/4" Matrix. 40/50 Road Speed 30 M.P.H. Limiting Improvement to 40/50 Comparison of Best 40/50 Conditions we can Give Customers and Hispano 40/50 28 3/4" Matrix Large Shutters Open Hispano Standard Louvred Bonnet 30 M.P.H. Hispano V 40/50 (Present Standard) Both Cars Louvred Bonnets. R.R. 21 1/4" Matrix. Comparison of Standard Present 40/50 Matrix and Hispano Similar Conditions CHART LABELS (BARS): Matrix Height 20 1/4" Matrix Height 21 1/4" Matrix Height 22 3/4" Matrix Height 23 1/4" +4" Tubes +8" Tubes Standard Shutters 4 x 10.5" Louvres Side Panels Off Top Panels Off Side Panels Off Front Shutters Open Rear Shutters Open All Shutters Open No Ventilation 20 M.P.H. 30 M.P.H. 40 M.P.H. No Ventilation 40/50 Without Fan 40/50 With Fan Hispano Without Fan Hispano With Fan Large Shutters Standard Hispano 40/50 - 28 3/4" Matrix 40/50 With Fan Hispano 20 M.P.H. Hispano 30 M.P.H. 40/50 20 M.P.H. 40/50 30 M.P.H. 40/50 With Fan Standard Hispano 40/50 Louvred BOTTOM AXIS: ATMOSPHERIC TEMPERATURE C° STAMP: ROLLS-ROYCE LIMITED PRINT ROOM 2 - 1 - 25 | ||