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).
The Bensport crankshaft, its balance weight studs, and testing on a Peregrine engine.
| Identifier | ExFiles\Box 85\5\ scan0011 | |
| Date | 27th May 1932 | |
| X 217. SERVICE To R.{Sir Henry Royce} from E.{Mr Elliott - Chief Engineer} c.c. Sg.{Arthur F. Sidgreaves - MD} Wor.{Arthur Wormald - General Works Manager} Hs.{Lord Ernest Hives - Chair} By.{R.W. Bailey - Chief Engineer} E.6/HP.27.5.32. Re Bensport. Please find attached print of LeC. 3097 showing the Bensport crankshaft to the dimensions proposed in E.7/HP.15.4.32. The balance weight studs have been shown the same size as on our 20/25 engine, as if this engine runs up to 5000 r.p.m. the stress in these studs will be the same as on the 20. The present Peregrine engine on test has a half period on the crank at 2700 r.p.m. with fan pulley only, 2400 r.p.m. with damper drum and parts, and 2550 r.p.m. with damper drum only. The major critical speed will naturally be twice these revolutions. Rm.{William Robotham - Chief Engineer} has been able to catch the second Peregrine engine that is on the way in time to instruct the crankshaft to LeC.3097 proportions, so that we shall be able to rehearse the crankshaft conditions on this engine as proposed for the Bensport. E.{Mr Elliott - Chief Engineer} | ||