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).
Potential modifications to the 20/25 engine's water pump to address boiling issues at low RPM.
| Identifier | ExFiles\Box 178\3\ img011 | |
| Date | 4th May 1932 | |
| ORIGINAL BY.{R.W. Bailey - Chief Engineer} FROM E.{Mr Elliott - Chief Engineer} E1/M11.1.32. C. to SG.{Arthur F. Sidgreaves - MD} MR. HS.{Lord Ernest Hives - Chair} x5770. x766. 20/25 ENGINE - re. BOILING AT 200 RPM. We do not know what difference in head was eventually measured by HNK. at 200 RPM. of the engine, but had concluded that 10% on the rotor dia. would not be sufficient. It must be remembered however that the head is proportion-al to the square of the velocity and therefore perhaps 20% on the dia. will be enough. The other features we wish to introduce is a big reduc-tion in the cross sectional area of the volute to choke off the circulation at high speeds. We think it will be necessary to reduce the cross sectional area to one half. These improvements could be standardised at the same time as the water pump end cover and bend in one piece, and the pump body could be in aluminium, using the same gland parts as P. 2., J.{Mr Johnson W.M.} 3., and Peregrine. E.{Mr Elliott - Chief Engineer} [STAMP: RECEIVED 4 MAY 1932] | ||