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).
With sketches discussing improvements to petrol tanks, focusing on air escape during filling and anti-surge measures.
| Identifier | WestWitteringFiles\O\January1926-March1926\ Scan43 | |
| Date | 2nd August 1926 | |
| HS.{Lord Ernest Hives - Chair}) TO B.Y.) FROM R.{Sir Henry Royce} DA.{Bernard Day - Chassis Design}) (Le CanadelHenry Royce's French residence.) G.{Mr Griffiths - Chief Accountant / Mr Gnapp} to C.J. B.J. ORIGINAL R2/M8.2.26. PETROL TANKS ETC. [Handwritten: P460 / 78992] The tank on 7-EX.(R's car at Le CanadelHenry Royce's French residence) is a great improvement, and with the exception that the gauge goes round anti-clockwise, there seems little to alter. The points are:- (1) Everyone uses pumps (avoiding cans for some reason). With some of the pumps the speed of petrol entry is uncontrollable because it is gravity fed from the measuring tank, with no cock. It is very fast because petrol is so limpid - (we were quite right in avoiding an ingoing filter.) (2) In our present standard the air escape is unsatisfactory. It should either be higher up, or a tube should be fitted, to prevent the outgoing air being trapped by ingoing petrol - (see sketch.) I was ashamed of one I saw. Please get it altered at the earliest possible moment: 10,000 miles should not be necessary. [Diagram of a petrol tank filler neck] Cr{Mr Cra???ster / Mr Chichester} pipe brought up there. Suggested inner tube. Vent pipe. Probably the nozzle I saw used on one of our standard cars was too short: afterwards a smaller one was screwed on, which reached further, and reduced the quantity. It was better, but not satisfactory. [Diagram showing a curved section with internal baffles] If any difficulty found from petrol surging across tank and out of Ventilated Cover ( in any type) I suggest diaphragms carried on Cover thus, with capacity above. R.{Sir Henry Royce} | ||