Rolls-Royce Archives
         « Prev  Box Series  Next »        

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).
Engine mounting experiments, including a new two-arm mounting scheme and damper placement.

Identifier  WestWitteringFiles\K\October1923\  Scan111
Date  3rd October 1923
  
R.R. 235a (100 ?) (S.H. 159 11-8-20) G.{Mr Griffiths - Chief Accountant / Mr Gnapp} 2800
TO HS.{Lord Ernest Hives - Chair} FROM E.{Mr Elliott - Chief Engineer}
cc to C.L.
ORIGINAL
SECRET.
E.{Mr Elliott - Chief Engineer} A.{Mr Adams} C.
ENGINE MOUNTING EXPERIMENTS.
Referring to your memo. HS{Lord Ernest Hives - Chair}11/LG11023. we note you are about to try the 20.HP. engine mounted with two rigid arms at the front end, and a single point at the rear in conjunction with dampers.
This is the simplest scheme we know of for EAC. as it demands only two box arms on the crankcase instead of six.
Regarding the dampers we suggest that these ought to be applied simultaneously opposite to the flywheel and at the end of the gearbox.
Do you think it is possible to bolt a two armed plate as above on to the rear of the gearbox, with dampers carried on the cross member from which the gearbox is suspended.
As regards reducing vibrations on Goshawks and 40/50 chassis we are depending on front dampers. We have designed these for the Goshawk and expect to do the same for 40/50. We believe Mr. Royce wishes to alter the Goshawk crankcase as soon as possible to be ready for this.
Referring to the puzzling variation in the Goshawk period we suggest that the nature of the faces of the bolted couplings on the rear feet might considerably affect this. If these faces were cleared away or thin packings inserted so that the couplings were definitely hard on transversely across the chassis, then the couplings should be equally flexible in carrying the bending effect of the engine torque. These thin packings could also be tried the other way round to see if the torsional stiffness of the cross member had any effect.
E.{Mr Elliott - Chief Engineer}
  
  


Copyright Sustain 2025, All Rights Reserved.    whatever is rightly done, however humble, is noble
An unhandled error has occurred. Reload 🗙