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 investigation into Goshawk exhaust pipe drumming on closed cars.
| Identifier | ExFiles\Box 48\4\ Scan179 | |
| Date | 23th November 1922 | |
| X4238 PN{Mr Northey}8/DN/23.11.22. TO Hs.{Lord Ernest Hives - Chair} c. to BJ. FROM PN.{Mr Northey} Goshawk Exhaust. I understand that arising out of certain criticisms recently with Closed Cars especially, you are going into the matter of altering the shape or length or position of the exhaust pipe with a view to its period of vibration being not likely, as at present, to cause drumming. I shall be glad to hear what steps you are taking, or results you are able to obtain, in this matter as soon as possible. PN.{Mr Northey} | ||