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).
Modifications to engine intakes and flight test results for 'Antelope', 'Fox', and 'Hart' aircraft.
| Identifier | WestWitteringFiles\S\September1928-October1928\ Scan126 | |
| Date | 1st October 1928 guessed | |
| -a- contd :- stood that the Avro 'Antelope' be fitted with the same type of intakes. It was agreed at Derby that to change the balance pipe would take too long and since both Mr. Archer and Flt. Lt. Bulman were certain the mixture was on the weak side, it was decided to increase the jet size. The main jet was therefore increased, the pilot jet remaining unchanged as the slow running was already on the rich side. A flight was made under these conditions with the specail intake made up by Hawkers andupon which all the previous tests had been made, and proved the carburation trouble had been overcome. The next procedure was to fit the new intakes I had designed and which I thought would be an improvement on the ones tested so far. Flight results proved that a gain of one mile per hr. was obtained together with a gain in engine RPM. was effected on climb. Also the pilot reported a considerably increased smoothness in the running of the engine. He reported that he had not flown a smoother running engine. The 'Antelope' and the 'Fox' aircraft, now at Martlesham are being fitted with the RR. air intakes made to the sketch supplied by Derby. Mr. Archer is applying the necessary modifications to the carburation. The unofficial speed of the 'Hart' on this morning's test worked out at 185 m.p.h. - Mr. Sopwith, who was present during the test, asked for confirmation of this. A summary of the comparison between the two types of intake carried out on the 'Hart' is as follows :- Increase in forward speed 7 to 8 m.p.h. Carburation a considerable improvement over the normal intakes contd :- | ||