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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).
Page detailing the purpose and characteristics of a spring drive, specifications for propeller shafts, and a note on the lighting circuit.

Identifier  ExFiles\Box 137\4\  scan0021
Date  1st June 1929 guessed
  
contd :-
-11-
for this purpose. We think the most probable reason for its use is the elimination of transmission rattles, which might otherwise have been transmitted through the flywheel, which is of such low inertia.

Some time ago we tried locking it up to see if it brought up torque reaction periods. All we could detect was slight rattles on the overrun, which at the time we attributed to our method of locking. Subsequent experiences on R.R. cars have suggested the above explanation.

The characteristics of this spring drive are :

Friction setting 29 lbs. ft.
Torque due to springs alone,
on stops. 131 lbs.ft.
Torsional rating of springs 3,500 lbs.ft/radian.

PROPELLER SHAFT.

This is open, and tubular, with welded-in steel ends. Weights of shafts complete with universal joints and bolts are :

20 HP. 24 lbs. 13 ozs.
Chrysler. 18 lbs. 8 ozs.
S.S. 35 lbs. 13 ozs.

The universal joint used is shewn in fig.7.
These appear simple and very light but have only line contact round the driving spheres. They should be good for oil-tightness. The shaft is located endwise by the two coil springs, which also allow for end movement.

LIGHTING CIRCUIT.

A current limiting relay is provided contd :-
  
  


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