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).
The functionality and limitations of a self-draining float in an Autovac, including a diagram.
| Identifier | ExFiles\Box 40\4\ Scan191 | |
| Date | 30th December 1926 guessed | |
| contd :- -2- via a leak to such an extent. The self draining action is perfectly capable of dealing with the maximum amount of petrol which can enter the float when in position in the Autovac. There are two conditions under which the self-draining action will not work :- (1) If there are two leaks in the float, one below the petrol level, and one above. (2) If petrol by splash leaks into the float through a puncture above the petrol level in the float chamber. The self-draining float is an advantage over a sealed float and as far as our experience goes it has no disadvantages. The conditions under which the selfdraining float will not function apply equally to the sealed float, but the latter of course will not function if there is a leak below the petrol level or above, in a position where petrol can leak in through splash. [Diagram text] AUTOVAC SELF-DRAINING FLOAT HOLLOW STEM FLOAT LEAK IN FLOAT (ARROWS INDICATE DIRECTION OF FLOW OF PETROL FROM THE FLOAT) Hs{Lord Ernest Hives - Chair}/A.J.Lidsey. | ||