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 power loss due to exhaust back pressure between a new B.60 engine unit and a conventional unit.
| Identifier | ExFiles\Box 124\1\ scan0058 | |
| Date | 29th March 1939 | |
| -2- Rm{William Robotham - Chief Engineer}/Swdl.{Len H. Swindell}2/MH.{M. Huckerby}29.3.39. Being a completely new design of unit, one of the first queries is whether this type of unit is more susceptible to power loss by exhaust back pressure than the conventional type of unit. We have endeavoured to show on the attached curve (S. 81) that the B.60 is no more sensitive to back pressure than the Bentley V unit by plotting back pressure in Ins.Hg against percentage power loss to open exhaust, the curves of the two engines being very similar. From these results, therefore, the high power loss (30 BHP) experienced on the B.60 unit is simply the case of a restricted system registering a back pressure of 20 ins.Hg. Rm{William Robotham - Chief Engineer}/Swdl.{Len H. Swindell} | ||