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).
Test report on the Bentley III petrol tank and filler located in the wing.
| Identifier | ExFiles\Box 100\2\ scan0128 | |
| Date | 21th January 1938 | |
| To By.{R.W. Bailey - Chief Engineer} c. to Da.{Bernard Day - Chassis Design} 2006 also 251 Rm{William Robotham - Chief Engineer}/JBD.{John B. Dixon - Fuel Systems}1/JH.21.1.38. +51 THE BENTLEY III PETROL TANK WITH FILLER IN THE WING. We have tested the above tank and filler, and have been able to fill it at the rate of 5 gallons in 15 seconds or 20 gallons per minute without the petrol regurgitating out of the filler. This is the maximum rate at which it is possible to fill with the experimental garage petrol pump. The tank was level during the test. We also found the full capacity of the tank is 17 gallons. The rubber connection below the filler head is situated in a position in which it may be damaged by the filling spout unless it is protected or the tubes are arranged to butt together. We anticipate that petrol will swill out of the vents in the filler head on corners unless a vent pipe is fitted as suggested in our memo. Rm{William Robotham - Chief Engineer}/JBD.{John B. Dixon - Fuel Systems}6/JH.8.12.37. We give below the gradients across the tank when the petrol rises to level with the lip of the filler. The readings are not a really true picture of what will happen when cornering owing to the tank air locking due to the position of the vent pipe and petrol in it, the angle of roll must also be added. Tank Capacity. Gradient across the tank. 17 gallons. 1 in 6.4 16 " " " 4.9 15 " " " 4.9 14 " " " 6.4 13 " " " 3.8 12 " " " 4.0 10 " " " 3.4 9 " " " 2.9 8 " " " 3.2 Rm{William Robotham - Chief Engineer}/JBD.{John B. Dixon - Fuel Systems} | ||