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).
The performance characteristics and design considerations for the Park Ward Rally Bentley.
| Identifier | ExFiles\Box 90\1\ Scan087 | |
| Date | 24th March 1934 | |
| - 3 - The Park Ward Rally Bentley. --------------------------- We have since noticed from your report HV8/23.3.34 that the Park Ward Rally Streamline saloon is actually 2½ miles an hour slower than Bn{W.O. Bentley / Mr Barrington}'s standard saloon. This emphasizes the value of having a really good streamline design for reference. Wind Noises. ----------- We have always said that streamline bodies will make more noise due to air scrubbing, and it was almost impossible to carry on a conversation in the driving cabin of Burney's car, but your previous tests demonstrated that there is a considerable amount of noise due to interferences which can be reduced by good design and workmanship in the body. Cutout. ------- We have asked the Experimental Department to make experiments with the cutout by attaching a short length of pipe which can be moved about and fixed in various directions. Side Wind. ---------- I noticed in driving this car in a strong cross wind that there was a pronounced tendency to move bodily sideways across the road and this is natural when the body is considered in plan view as the section of an aeroplane wing which in relation to a cross wind would have lift, and the lift would manifest itself as a horizontal force pushing the car sideways. This perhaps might be considered on wind tunnel model design in confining the streamline sections to vertical planes rather than horizontal. Weight Distribution. ------------------- It would be interesting to have the axle weights of this car. No doubt with luggage and one or more rear passengers the weight distribution would be improved, but there is not much that can be done to alter it. E.{Mr Elliott - Chief Engineer} | ||