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 the pilot jet tube for Condor, Eagle, and Falcon carburetters.
| Identifier | ExFiles\Box 37\2\ scan 203 | |
| Date | 29th July 1918 | |
| Contd . E2/G29718 . -2- 29th July.1918. Would you kindly arrange in connection with the "Condor" carburetter that the petrol supply holes to the pilot jet tube should be high enough not to receive petrol at cruising speed. Our Eagle, and Falcon carburetters should also be inspected with a view to determining this point. (2) It is now recommended that the pilot jet be made by making the pilot tube into a capillary where the restriction should occur. This greatly weakens the tube in question at the point where the jet is required, but it may be prefer-able to the fiddling job of soldering in a little piece of brass with the jet hole drilled through it. From the detail drawings I have seen, it might appear that this new method is already being applied to the Eagle but perhaps you could try both on the Condor, and report which method you think is the best. (3) On the later drawings of jets which we have seen Messrs. Hobsons shew a small collar soldered round the outside of the pilot jet tube near the top, which is apparently in-tended to block the way out for the emulsion, through the leak between the pilot tube and the hole into which it fits at the top of the diffuser. We have not shewn this feature on our Condor drawings but we should be glad if you would try it experimentally to see what it is worth. It may be that you are informed already regarding the points in this memo, and may have already applied them ConttD. | ||