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).
Suggested aerodynamic modifications and performance comparisons for saloon and streamlined cars.
Identifier | ExFiles\Box 90\1\ Scan083 | |
Date | 22th May 1934 guessed | |
- 2 - behind the driver and would put an auxiliary foot rest for him, as in the back position he cannot reach the sloping footboard. (9) The tail would be brought down 2 or 3 ins lower, so as to avoid seeing under the car from the rear. (10) If it were possible I would have a bonnet and radiator 1 ins. lower for this special class of coachwork, but this is not essential. (your suggestion) (11) The cycle type wings with a mud shield placed horizontally would be the only immediate solution to a good aerodynamic front, but I prefer the alternative solution of the Airflow Chrysler front, as it is just as good, (See Test 20 and 21) and is better mechanically. It gives the full permissible wheel looks and the wings are as effective as the standard ones. SPEED WITH PRESENT H.P. The drag figure for the Standard Saloon is 356.5 lbs at 86 m.p.h. and that of the Streamline car at the same speed is 255 lbs. With the above modifications we estimate the drag to be increased pro-rata with the maximum cross-sectional area and would be 264 lbs. This would give a lap speed of 92.5 m.p.h. as against the present lap speed of 95 m.p.h. THE PARK WARD RALLY BENTLEY. This car was a copy of our car, but with the interior dimensions of the standard saloon and with the front wings of the slipper type. Our tests show that these wings are no better than the standard wings, and since the body has the same cross-sectional area as the standard Saloon, its lap speed will be the same, i.e. 86 m.p.h. (See Test 18c.) No advantage is gained by a tail unless one uses either cycle type front wings or a Chrysler Airflow front (See Test 20 and 21). We propose trying to get track figures for the Park Ward car if we can borrow it, to check this. WIND NOISES. Although our Streamline car has no Sunshine roof, it suffers badly from wind noises above 50 m.p.h. in still air. This is no | ||