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).
Proposal for a chassis engine carburetter design using two butterfly valves in series.
| Identifier | ExFiles\Box 13\3\ 03-page084 | |
| Date | 1st February 1929 | |
| X. 7080 Hs{Lord Ernest Hives - Chair}/ACL. from E.{Mr Elliott - Chief Engineer} E4/MS.2.29. c. to SG.{Arthur F. Sidgreaves - MD} BY.{R.W. Bailey - Chief Engineer} PROPOSED CHASSIS ENGINE CARBURETTER. ================================ Referring to your memo. Hs{Lord Ernest Hives - Chair}/ACL/LG28.1.29., and R4/M1.2.29., I suggested about 2 yrs. ago the use of two butterfly valves in series to render the chassis carburetter straight through as regards its main throad, and the idea has been discussed a number of times since in combination with other features. The original scheme proposed was a shewn in diagram. SEE ORIGINAL FOR SKETCH. The lower butterfly was arranged so that when closed it drained any petrol deposited below the throttle back into the low speed choke. R.{Sir Henry Royce} added a rotary air valve directly mounted on the spindle of the lower butterfly in place of the piston and links. E.{Mr Elliott - Chief Engineer} | ||