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).
Tyre pressures and exhaust valve testing for the Open Trials Phantom car 103-MC.
| Identifier | ExFiles\Box 71\3\ scan0315 | |
| Date | 3rd September 1925 | |
| TO CWB FROM R.{Sir Henry Royce} Copy to - CJ PN{Mr Northey} CAR NO. 103-MC - OPEN TRIALS PHANTOM. We should not expect it to be necessary to go so high as 55 lbs. per sq. in. on demonstration cars, especially if the wheels and tyres had been balanced. Under these conditions we believe that 45 lbs per sq. in. will carry the car as fast as it can be driven on the ordinary roads in England. Regarding the butterfly valve in the exhaust pipe, for some time I have been very much in favour of doing away with this. This we are testing. R.{Sir Henry Royce} | ||