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).
Experimental tests to fix the 'Phantom booms' complaint by modifying engine and body mountings.
| Identifier | ExFiles\Box 137\4\ scan0269 | |
| Date | 19th March 1931 | |
| Mervin Jones x634. Alry. 19.3.31. Royce, Les Mimosas, Le CanadelHenry Royce's French residence, Par-le-Lavandou, (VAR) FRANCE. Phantom booms. Experimental tests show we can overcome complaint by removing rear engine feet and attention to body mounting we are obtaining worst examples to confirm this. | ||