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).
Potential design simplifications and improvements for the Japan 3 engine.
| Identifier | WestWitteringFiles\V\October1930-February1931\ Scan242 | |
| Date | 25th January 1931 | |
| E.{Mr Elliott - Chief Engineer} HS.{Lord Ernest Hives - Chair}) FROM R.{Sir Henry Royce} BY.{R.W. Bailey - Chief Engineer} ) (At Le CanadelHenry Royce's French residence.) C. to - SG.{Arthur F. Sidgreaves - MD} WOR.{Arthur Wormald - General Works Manager} ORIGINAL JAPAN 3. ENGINE. R2/M25.1.31. x5770. If we have got to have spring drive I think the aero engine type which we decided for the private venture engine the best. But I hope you will decide that it is not wanted because the gears at back or stiffer crankshafts only need damper, and not spring drive. Information seems to point to double bearings at rear, and gears there also. Any slipper wheel should have bearings to prevent it trusting to friction plate against flapping. We could make simpler job if we could take torque from fly-wheel casing and hold up engine at nose, like at gearbox, by removing fan pulley and putting on sheet steel plate to carry vertical weight of engine. You will see the casting (crankchamber) will be a much simpler casting, and then if we could do with 3 driving wheels instead of 5 we should be doing something to counter-balance other costs. I am sure these ideas if they are possible are worth a struggle and the time taken. R.{Sir Henry Royce} RECEIVED 29 JAN 1931 | ||