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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).
List of tests carried out to resolve drive to overrun transmission chunking noise.

Identifier  ExFiles\Box 94\1\  scan0217
Date  18th October 1935
  
x326 Hs{Lord Ernest Hives - Chair}/Gry.{Shadwell Grylls}25/KW.18.10.35

Drive to Overrun Transmission Chunking.

Attached is a list, not in chronological order, of tests so far carried out to overcome this trouble. The noise is characterised by the fact that it is worse the lower the speed, and that there is always a maximum speed above which chunking is not audible.

CAR
TEST
RESULT

(1) 29-EX
Original separate synchro 2nd speed J-3 box
Worse than standard Ph.II

(2) 29-EX
25º gears having very little total backlash. 3rd gear .013 at 1.875 on 3rd motion shaft.
Very good

(3) 33-EX
C.M. and 3rd continuous 2nd motion shaft gears light on splines
Improvement

(4) 35-EX
C.M. .0045 pitch line)
3rd .0045 " " }
Sliding piece .002 on splines .003 in top dogs, .005 in 3rd
Bad in 3rd gear

(5) 35-EX
Same as (4) but C.M. pitchline slack .001
Much better in 3rd gear.

(6) Any SpectreCodename for Phantom III
Heavy flywheel or softer rubber mounting.
Improvement

(7) 30-EX
Mobiloil 'C' instead of Hi-Press light
No improvement
  
  


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