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).
Page of calculations for the percentage correction to Brake Horse Power (B.HP).
| Identifier | ExFiles\Box 37\3\ scan 120 | |
| Date | 20th September 1917 guessed | |
| contd. - 4 - of their N.T.P. values. at standard state Thus we have also Bo = (19 Io - 200) / 17 in which both Bo and Io have the value 100. It follows at once that - b = Bo - B = 19/17 (Io - I) = 19/17 * 1 Hence the % correction to the B.H.P. = 100 b/B = 100 * ((19/17) * 1) / ((19I - 200)/17) = 100 * (19 * 1) / (19I - 200) = 100 * (1/I) {1 - 200/(19I)}^-1 = 100 * (1/I) {1 + 2/19} approx since I = 100 nearly. = (21/19) x 100 * (1/I) = (21/19) x (3.34 p + .173 t.) = 3.7 p + .19 t. (nearly enough for practical purposes). Example. If P = <s>2810^c</s> 28.0" and temp. = 10°C then p = 1.9 and t = -6 and the % correction to the B.H.P. is Contd. | ||