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).
Engine testing issues, post-test examination, and subsequent carburettor adjustments for air trials.
| Identifier | ExFiles\Box 36\2\ scan 191 | |
| Date | 10th October 1928 guessed | |
| contd :- -7- We were unable to obtain accurate consumptions during this period as we had considerable trouble with the fuel supply system when we changed over to the Benzol tank. It became necessary to keep the engine running on an auxiliary tank while the fuel stoppage was remedied. When the 1 hr. full throttle run was commenced the cooling fan driving belt broke and damaged part of the fuel line to the flowmeters which rendered them erratic so that no reliable readings were obtained over this period. The fact that the cooling fan was not in operation would easily account for the 2% difference in power between the start and finish of the test. Examination of the engine since dismantling shews it to be in excellent condition. The valves, valve seats, pistons and rings shew not the slightest signs of distress through weak mixtures. The bearings were also in very good condition. We understand it has now been arranged to follow up these tests in the air with a Fairey 3F. machine and are at present engaged in preparing a set of carbs. for this machine. As it now is a question of reproducing these results in the air, we are paying particular attention to the details of the carburation. Each carburetter of the set is being tested and adjusted to give precisely the same performance with regard to metering and range of mixture control. Smaller jets are being fitted and we think a certain amount of automatic altitude mixture ratio correction will be obtained because we have noted that when operating under a depression the mixture becomes weaker. contd:- | ||