Request to modify the Bentley 20/25 flexible bladed fan due to a crack developing at the root during testing.
| Identifier | ExFiles\Box 86\5\ scan0057 | |
| Date | 19th March 1936 | |
| To RHC. {R. H. Coverley - Production Engineer} x224 Hs {Lord Ernest Hives - Chair} /Std.6/JH.19.3.36. Bentley & 20/25 Flexible Bladed Fan. We have run the 20/25 flexible blade fan which you built up for us on the test bed and the results obtained are promising. However, one of the spring blades has developed a crack at the root of the blade, due to heavy local stress. We should like you to modify the EX details to incorporate a backing strip of spring steel of same thickness as blade, projecting about .125" from root of blade in order to strengthen up at this point and build us a set of blades with this feature incorporated, retaining the same blade thickness (.010). Hs {Lord Ernest Hives - Chair} /Std. | ||
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).