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).
Experiments and results on Goshawk ballast resistances.
| Identifier | ExFiles\Box 54\5\ Scan270 | |
| Date | 11th June 1924 | |
| To EY. from EFC. {E. Fowler Clarke - Electrical Engineer} X3485 EFC {E. Fowler Clarke - Electrical Engineer} 9/T11.6.24. X.3485 - GOSHAWK BALLAST RESISTANCE. Reference your EY10/H27.5.24 and further to our EFC {E. Fowler Clarke - Electrical Engineer} 2/T29.5.24, we have now completed certain experiments on various ballast resistances, the detailed results of which are shown in my assistant's report WA. {Mr Wallis} 42, copy of which is attached. It would appear from this that the ultimate tensile load of the new wire which is at present being used on production is 8 lbs. 14 ozs. The report mentions the corresponding loads we have observed on the wire taken from various ballast resistances. The standard length of ballast resistance wire is 25". No.1 ballast tested was an experimental one of 32". The test of this was merely of a preliminary nature. No.2. test was a 15" ballast resistance which has been running on experimental chassis 3-GII from the early days of these ballast resistances until the present. No.3. ballast removed from 7-GII was standard, though we do not know the number of miles run. Although this wire may have been the old kind previous to the improvement in quality, it does not seem to have suffered materially. No.4. ballast (present standard production), though subjected to an extensive test, has not suffered as much as might be expected. It is to be remembered that we have at one time | ||