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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).
Secret memo providing design feedback on Mr. Stent's servo drawing for the EAC.4 gearbox.

Identifier  ExFiles\Box 72\4\  scan0125
Date  1st February 1924
  
X9770

To Mr. Stent
RG.{Mr Rowledge} E.{Mr Elliott - Chief Engineer} DA.{Bernard Day - Chassis Design} } FROM R.{Sir Henry Royce}
copy to CJ. BY.{R.W. Bailey - Chief Engineer} HS.{Lord Ernest Hives - Chair}

S E C R E T.

R3/M15. 2. 24.

SERVO FOR EAC. 1, 2, 3, 4 & 5.

X. 9770
X. 9940
X9910

Re. LeC.1827. - Mr. Stent's drawing of the servo applied to EAC.4. gearbox.

(1) I think we should use Enot greasers throughout.

(2) The 3 bearings of the servo and the driving shaft I fear will not be in exact alignment, therefore the friction surfaces will not bed. Can they be made to float or shall we have to mount the driving ring (centre) on a flexible mounting which is torsionally rigid, say a sheet steel spinning?

(3) I do not quite like the difficult turning on the outer plate to form oil thrower. Could we rivet on sheet metal spinning or pressing by the same rivets that hold the lever or fendo?

(4) The lever that receives the pull from the pedal should be as near the bearing as convenient or pass inside the bearing.

(5) Make as few pieces as possible. There seem too many collars, washers, rings, and pieces for safety and adjustment which I think should be reduced. For instance the breaking of the ratchet spring is very unlikely and if it broke the pieces would probably be large enough to stop on the shaft. Again if a piece got away it might fall clear of everything.

(6) There is a part marked 'hydraulic fit'. This is made considerably larger in dia. i.e. one tenth. Would not one hundredth difference be sufficient?

(7) In EAC.3. do we not want the shaft to come contd:-
  
  


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