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 capabilities of Dodd's Indicator following a visit to the Anglo-American Oil Company.
| Identifier | ExFiles\Box 138\2\ scan0072 | |
| Date | 13th January 1937 | |
| REPORT ON VISIT TO THE ANGLO-AMERICAN OIL COMPANY - 13.1.1937. DODD'S INDICATOR. Demonstrations of the above indicator on a non-boosted engine have shown how, in addition to its normal function of producing pressure-time diagrams, it can illustrate periodic movements and pressures of all kinds. Although conditions are very different on a high duty boosted aero engine the only application which will be seriously affected is the pressure-time diagram, and, while the instrument forms an almost perfect detonation indicator, it can also be applied to so many problems that it is considered that its purchase would be well worth while. The following are typical problems which can be investigated :- (a) Valve lift diagrams while the engine is in motion. (b) Valve spring surging. (c) Crankshaft and flywheel irregularities. (d) Crankshaft surging. (e) Investigation of the pressure in the induction pipes leading to each cylinder of a main engine (which will be of considerable help in any distribution investigation). (f) Detonation as applied to a main engine on test or in flight. (g) Elongation of cylinder holding down studs and fatigue effects. (h) Shock damper indicator diagrams. (j) Chain-driven camshaft investigation. (k) Vibration effects of all kinds. The instrument it self is entirely self-contained, the only exterior connection being a single wire leading to the pressure or movement measuring element. Thus its use is not confined to the test-bed but it can be used in flight, on the road or in the hangar. Moreover, since the indicator is only built to | ||