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 to Hydraulic Coupling & Engineering Co., Ltd. regarding the specification for a fluid coupling for a petrol engine, likely for a winch.
| Identifier | ExFiles\Box 175\2\ img063 | |
| Date | 14th February 1941 | |
| C. Rm.{William Robotham - Chief Engineer} EV{Ivan Evernden - coachwork}/DB.{Donald Bastow - Suspensions}2/RH.{R. Hollingworth} Handwritten: Winch 14th February, 1941. Handwritten: 2006 Hydraulic Coupling & Engineering Co., Ltd., Fluidrive Works, Worton Road, ISLEWORTH, Middx. For the attention of Mr. W.H.K. James. Dear Sirs, Thank you for your letter of February 5th last, ref. WHKJ/JA.E.6384, containing your recommendation for the size of fluid coupling for the application we have in mind. Since speaking to you on the telephone, we have had to make one alteration to the particulars given to you, namely the maximum engine speed will be 4000 r.p.m. and the horsepower transmitted at this speed not greater than 212. The maximum torque, at 1800 r.p.m. is not greater than 348 lbs.ft. The driving unit, incidentally, is a petrol engine. I am afraid that at this stage, I cannot give you full particulars of the actual purpose for which the coupling is required. The conditions correspond exactly to speeding up a flywheel from rest to maximum speed, and the speeding up process should occupy not more than one minute. The minimum time before the cycle can be repeated is approximately 5 mins, but is likely to be appreciably more than this, and in addition, it is unlikely that such a cycle would be repeated more than say 5 times at the outside before a considerably longer interval occurs. I regret that I cannot be more definite than this, but I have endeavoured to give the worst conditions likely from the information available, and the probability is that the time inverval between successive working periods will be greater than the five minutes quoted. The output end of the engine has a solid (i.e. non-detachable) flange with a bolt circle of approximately 3.125" pitch circle diameter with a spigot diameter of approximately 2.625". If your diaphragm driving disc could be modified to fit on here, it would save us an adaptor piece. In any case, we would be glad to save the length P.J shown on your chart by attaching direct or through an adaptor -cont- | ||