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).
Test results for various configurations of a Bentley Air Silencer.
| Identifier | ExFiles\Box 85\4\ scan0027 | |
| Date | 15th May 1933 | |
| X208 Files 15.5.33. BENTLEY AIR SILENCER. (1) No Air Intake Load. BHP. PTs/Hr. Pts/BHP/Hr. Indn Depn. "Hg. Intake Depn. "H2O 64.6 107.6 65.5 .609 1.6 - (2) Improved Intake bend (ex.19.G.IV). 65.4 109.0 68.0 .624 1.65 2.15 (3) As (2) Expl. Silencer fitted (complete) 64.5 107.4 73.5 .684 1.90 6.5 (4) As (3) Baffle moved 1.0" forward 64.5 107.4 73.5 .684 1.90 6.1 (5) As (3) Baffle moved 2.0" forward 64.2 107.0 70.6 .657 1.85 5.3 (6) P.II. Standard silencer 8" long centre tube. 64.3 107.3 68.4 .637 1.8 4.7 | ||