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).
Calibration and installation issues of a fuel tank unit.
| Identifier | ExFiles\Box 44\3\ Scan067 | |
| Date | 9th November 1928 | |
| Messrs.Rolls-Royce,Ltd., Date 9.11.28. Page 3 The unit as shown on K-S.162 should start to register when something between one-third and half a gallon have been put in the tank, unless the angle of this installation is considerably wrong, which would have the double effect of tilting the bottom bell and so raising the datum from the point at which we have assumed it to be, and also actually raising it a small amount in the tank. It might possibly be that we have shimmed the dash instrument for a wrong facia board angle, but if the short reading on the gauge remains constant at 1 1/2 gallons throughout the range, we do not think this is the trouble, as the amount would vary over the complete range. Would it be possible for you to let us have the new type 40/50 h.p. tank with unit installed closer to the baffle, as shown on your drawing F.79525? We could then calibrate this, and get the exact length for the unit, and investigate our datum in conjunction with the angle of the bottom bell. We could also at the same time see the possibilities of getting the top cup as high as possible, and as much off-set as will pass through the gauge hole into the tank. | ||