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).
Recommendations on recording systems for vibration measurement in flight and airscrew testing.
| Identifier | ExFiles\Box 138\2\ scan0173 | |
| Date | 13th September 1938 guessed | |
| - 7 - (6) RECOMMENDATIONS. Although we have been favourably impressed by the Cambridge system of recording, we feel that in its present form the instrument would be of little real use and would certainly not justify the expenditure for the continuous film pattern. This statement is made in face of the opinion already expressed that we should as a matter of definite policy explore and develop methods of mechanical recording concurrently with the electrical work now under way. This is considered desirable in view of the adequacy of the mechanical systems for a number of our interests and the definite advantages in respect of simplicity and ease of application, as well as the suitability for flight testing. However, following conversations with Dor{Mr Dorey}/Hks and our own experience we have become interested in the R.A.E. seismic vibrograph preferring this type to the hand-held pattern for its greater suitability in flight and airscrew tests. Several instruments of this pattern can be used concurrently with the time marking system connected so that the diagrams can be phased, a point of great importance in studying vibrations in frameworks. Their most serious disadvantage appears to arise from the necessity of several days delay, required for development of the cine film, before the records are available for inspection. We would also point out that although much of the early work on vibration measurement carried out at the R.A.E. and recorded by H.{Arthur M. Hanbury - Head Complaints} Constant (R.{Sir Henry Royce}& M.{Mr Moon / Mr Moore} 1637, Oct.1934) was performed with a continuous-film Cambridge vibrograph, it would appear that this has been largely supplanted by the R.A.E. pattern during later stages of the research. We have now secured a specification for this instrument from the Air Ministry and have contacted an instrument-maker who is experienced in their construction. This matter is being closely followed up. Lr{Mr Ellor}/HWS. | ||