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).
Design modifications and agreements for the S.U. Aero Carburetter.
| Identifier | ExFiles\Box 31\5\ Scan272 | |
| Date | 11th December 1934 | |
| 11th December 1934. S.U. Aero Carburetter. (1) Balance hole to be transferred from mouth of choke to a position lower down in the air inlet, to remove fault in engine characteristic. This to be tried out temporarily with pipe fitted into existing balance hole. Casting to be altered later. (2) Float Chamber Mechanism. There is a pronounced tendency to flood after initial erection and after the floatchamber has been drained. S.U. will consider reversing the mechanism so that it is all carried from the top half of the carburetter, and in the meantime RR. will try an experiment bell mouthing the hole through the needle control rod, and re-testing for sticking and flooding. S.U. will consider a ball housing instead of a pin for the needle anchorage in the modified mechanism. The question of float rigidity was raised, and it was agreed that S.U. would make a yoke with a cross bar so that the cork float would be held on with 4 rivets arranged on a cruciform fixing. (3) Coring of floatchamber casting. It is agreed that S.U. will core out all the pockets which are now external from inside the air inlet. It is not anticipated that this will disturb the air flow to the choke, in fact in one place it should improve it. As regards the external cavities at the rear on each side of the floatchamber, it is agreed that S.U. will core these out from within the aeronoid chambers. The floatchamber and the other part of the carburetter | ||