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).
Letter discussing torsion test results on a wide-web Phantom crankshaft and requesting data for a Curtiss D-12 crankshaft.
| Identifier | ExFiles\Box 25\3\ Scan348 | |
| Date | 16th May 1928 | |
| X634 16th. May 1928. Ha/Tsnl/LC. H.{Arthur M. Hanbury - Head Complaints} Constant Esq., The Engineering Laboratory, Cambridge. Dear Constant, I must apologise for not replying XXXXXXXX before, but I delayed my letter until I could include another torsion test result on a wide-web Phantom crankshaft. Unfortunately, the result is so unexpectedly weak that we are repeating the test, when we get the chance. The shaft is now in an engine. The maximum torques applied during torsion tests were :- E.75216/76546 720 lbs.ft. E.54084/54640 820 lbs.ft. We kept no record of the bearing clearances unfortunately. These varied, as some shafts and bearings were new, and others had had test-bed running. I believe you have twisted a Curtiss D-12 Crankshaft. If so, I should like a figure for the in-bearing stiffness. We ourselves have had a Curtiss engine here, and I have got the dimensions, but we did not do a torsion test. I do not think this piece of information would be considered a breach of Air Ministry confidence, as the engine is not English, and we know most things about it already. We have been unable to commence our electrical experiments yet owing to a rush of work on another subject. Yours faithfully, | ||