Failures and potential solutions for the Wraith's front brakes due to overheating.
| Identifier | ExFiles\Box 7\7\ X 606 Brakes-page129 | |
| Date | 26th August 1938 | |
| By. {R.W. Bailey - Chief Engineer} from Rm {William Robotham - Chief Engineer} /AFM. {Anthony F. Martindale} c. Ds. c. Ry/AL4. 606. Rm {William Robotham - Chief Engineer} /AFM {Anthony F. Martindale} 2/R.26.8.38. WRAITH FRONT BRAKES. You will recollect that the iron front brake drums of the Wraith which ran 15,000 miles in France failed. The failure took the form of deep cracks which extended right through and across the drum working face and were due to excessive temperature. We reduced the front braking by 10% on production, and we also said that French conditions were exceptional. The Wraith 24.G.V. which has done 24,000 miles in England under customer conditions has just done the same thing. It is, therefore, unwise to ignore the phenomena or to say that a 10% reduction will prevent all damage to drums. The four-shoe brake scheme SCD.734 has been produced to overcome this trouble. We have had our original design costed, and it is rather more expensive than the present brake, but we do not see why the Design Dept., knowing all the figures, should not reduce it. We shall have to test the first brake which has now done 10,000 miles more thoroughly with a view to ultimate standardisation, and we would like the Design Dept. to examine the drawings. Rm {William Robotham - Chief Engineer} /AFM. {Anthony F. Martindale} | ||
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).