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 development and testing of an adjustable air silencer, including a dimensioned sketch.
| Identifier | ExFiles\Box 102\1\ scan0104 | |
| Date | 3rd January 1933 guessed | |
| -2- This gave us a still further slight improvement. We next fitted a tube 2.5" diameter to the top casting so that we could fix up our adjustable air silencer as previously fitted to our P.II's, using a 2.5" diameter air intake pipe. After trying various sizes of tuning chambers, and lengths of intake pipe, we found the sizes and capacities we required to give us 100% efficiency. We then had a silencer made up as per sketch 3, and fitted to the car with 100% results. We are checking for loss of power, but are fairly certain we are O.K. in this respect. Sketch 3. Text on sketch: 15" 4 5" 3 3" 25" 9 0" 2.5" 6 7/8" 14 - 5/16" DIA HOLES 8 - 1/2" DIA HOLES CARB Hs{Lord Ernest Hives - Chair}/ G.H.Wayman. | ||