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).
Comparison of performance between a standard front expansion chamber and the Hs.1585 model.
| Identifier | ExFiles\Box 86\3\ scan0079 | |
| Date | 28th February 1935 | |
| FILE. X223 28.2.35. Front Expansion Chamber to Hs.{Lord Ernest Hives - Chair}1585. Attached is curve B.V.75 on which are compared a standard front expansion chamber and one to Hs.{Lord Ernest Hives - Chair}1585. It will be seen that the standard system is slightly better than Hs.{Lord Ernest Hives - Chair}1585 at the high speeds, the increase amounting to approx. 3 HP. at 4500 r.p.m. and 1.2 H.P. at 4,000 r.p.m. The back pressure is also higher with the Hs.{Lord Ernest Hives - Chair}1585 expansion chamber. Due presumably to the difference in capacity, there is a slight increase in low speed M.E.P. Hs{Lord Ernest Hives - Chair}/R.{Sir Henry Royce} Matthews. | ||