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 report on Bourdon shutters, recording air and water temperatures at 40 and 60 M.P.H. with shutters open and closed.
| Identifier | ExFiles\Box 5a\3\ 03-page040 | |
| Date | 19th March 1931 | |
| XS 840 19.3.IV. 19/3/31 TESTS WITH BOURDON SHUTTERS. Temperatures taken every mile. All runs commenced at 70°C [TABLE 1: 40 M.P.H.] IN. 40 M.P.H. Column 1: Shutters Closed. Air. | Water. 19 | 73 19 | 71 18.5 | 75.5 20 | 71 19 | 70 Column 2: Shutters Open. Air. | Water. | Diff. 19.5 | 71 | 1 18.5 | 68 | 2.5 20 | 68 | 2 18.5 | 68.5 | .5 Average Diff. 1.8°C OUT. 40 M.P.H. Column 3: Shutters Closed. Air. | Water. 18.5 | 71 18.5 | 68 18.5 | 68 19.5 | 68 19.5 | 65 Column 4: Shutters Open. Air. | Water. | Diff. 19 | 67.5 | 3.5 18.5 | 65.5 | 3 18.5 | 65 | 3 19.5 | 66 | 2 19.5 | 60 | 5 Average Diff. 3.1°C [TABLE 2: 60 M.P.H.] IN. 60 M.P.H. Column 1: Shutters Closed. Air. | Water. 20.25 | 76.5 20 | 75.75 20 | 75 20 | 75.5 20 | 76 Column 2: Shutters Open. Air. | Water. | Diff. 20 | 75.5 | 1 20 | 73 | 1.75 20 | 73 | 2 20.25 | 74 | 1.5 | | 2 Average Diff. 1.65°C OUT. 60 M.P.H. Column 3: Shutters Closed. Air. | Water. 19.75 | 75 19.5 | 75 19.5 | 77 19.5 | 79 19.5 | 77 Column 4: Shutters Open. Air. | Water. | Diff. 20 | 74.5 | .5 19.5 | 70 | 5 19.5 | 73.5 | 3.5 19.5 | 74 | 5 19.5 | 74 | 3 Average Diff. 3.4°C J.H.Hancock. J.H.H. | ||