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).
Trial modifications for the Phantom steering system.

Identifier  ExFiles\Box 17\3\  Scan159
Date  14th July 1927
  
To Hs.{Lord Ernest Hives - Chair}
DA.{Bernard Day - Chassis Design} from R.{Sir Henry Royce}
BY.{R.W. Bailey - Chief Engineer}
c. to BJ. BY.{R.W. Bailey - Chief Engineer} E.{Mr Elliott - Chief Engineer}

X7430

R5/M14.7.27.

PHANTOM STEERING MODIFICATIONS. X.8430 X.7430

We are sending for trial the following because we all feel certain that we might get some benefit if we could reduce the risk of the oil film breaking down.

So with a large dia. worm having a slow angle (increased degree or irreversibility from the .940 Phantom) we give N.sch.2414 modified to .9 pitch. This has -

(1) Larger nut giving greater area of threads 2.150".
(2) Longer lever inside box from 1.750 to 2"
(3) Shorter pendulum lever from 11" to 10".
(Note bracketed to items 2 & 3: Reducing load on nut.)
(4) Same speed of steering.

The figure of merit for load will be 1.460.

With this it leaves us the only remaining and great move of reducing the weight on the front wheels by -

(a) Moving the weight back.
(b) Lightening the parts forward of the centre.

We must have however steering with a well bedded nut, and a well polished worm.

R.{Sir Henry Royce}
  
  


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