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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).
Gear rattling issues, comparing a heavy spring driving load to the standard setting.

Identifier  ExFiles\Box 138\1\  scan0004
Date  2nd January 1932
  
-2-

Ha/LH.{Mr Haworth}2/KT.2.1.32.cont'd.{John DeLooze - Company Secretary}

and a heavy spring driving load of 30 lbs. at 17.5" radius.
This is a big improvement as far as gear rattles are concerned
at low speeds full throttle over the standard spring drive
setting which according to drawing are -

Frictional Load 13 - 15 lbs. at 17.5" radius.
Spring drive load 20 - 25 lbs. at 17.5" radius.

There is a period of gear rattling at 1500 R.P.M.
and this is unaltered in any way by various frictional or
spring drive loading. However it is not noticeable on the
road.

Ha/L.H.Swindall.
  
  


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