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).
Data table showing the variation of a co-efficient with temperature for 'SAFEGUARD'.
| Identifier | ExFiles\Box 141\3\ scan0146 | |
| Date | 14th February 1933 guessed | |
| Variation of Co-efficient with Temperature on "SAFEGUARD" Temperature °C SB.{Mr Bull/Mr Bannister}1 SB.{Mr Bull/Mr Bannister}2 Co-efficient 10 - 45 - 20 31 " .344 30 31 " .344 40 31 " .344 50 32 " .355 60 32 " .355 70 32 " .355 80 33 " .366 90 38 " .422 100 39 " .433 110 39 " .433 120 41 " .455 130 43 " .477 140 44 " .488 150 45 " .500 160 45 " .500 170 45 " .500 180 45 " .500 190 45 " .500 200 45 " .500 210 46 " .511 220 47 " .522 230 47 " .522 240 48 " .533 250 51 " .566 260 52 " .577 270 54 " .600 280 54 " .600 290 56 " .622 300 57 " .633 310 58 " .644 SB{Mr Bull/Mr Bannister} = 45 lbs. corresponds with a pressure of 20 lbs/sq.in. Average surface speed during test = 4650 ft/min. | ||