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 causes and prevention of 'roof booming' in vehicle bodies.
| Identifier | WestWitteringFiles\J\December1922\ Scan79 | |
| Date | 11th August 1920 | |
| R.R. 235A (100 T) (S H.{Arthur M. Hanbury - Head Complaints} 159 11-8-20) G.{Mr Griffiths - Chief Accountant / Mr Gnapp} 2800 (3) R example the Maythorn saloon)In the older days of luggage be- ing carried on the roof booming did not seem to be so prono- unced due to the roof having to be stiffened outside by long- itudinal slats to prevent damage. Ventilators are often fitted to roofs to prevent booming and are sometimes success- ful, possibly due to there being an outlet having an orifice co-efficient, but also possibly because of their being fitted the roof has to be stiffened. The Cunard Co., are now ad- vertising that they will cure any car from booming by setting up coil springs between the roof and sticks. In conclusion we might say that whilst one can do a lot by protecting the body from chassis vibrations, yet it is difficult to protect it from disturbances arising from air waves, and the root of the trouble to be remedied appears to lie in finding non-booming construction for the body. DA{Bernard Day - Chassis Design}/EV.{Ivan Evernden - coachwork} | ||