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).
'singing' noise from diaphragms, concluding it is an adjustment issue not a design flaw.
| Identifier | ExFiles\Box 81\1\ scan0041 | |
| Date | 17th April 1913 | |
| Mr Wormald X332V 17/4/13 Re attached sheet. The whole trouble with these diaphragms seems to be the amount of lap is not the same on all throttles. When we were experimenting with these originally we made them 'sing' by not having sufficiently clearance between the low speed throat & the diaphragm when running slow. This arrangement has now I should say 20,000 miles on different experimental cars, & we have never had a complaint of one singing. We have one on 2301 which commenced to sing immediately the engine was run, I do not consider it a question of design it is a matter of adjustment. | ||