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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).
Weight comparison of propeller shafts for the Wraith and Phantom III models.

Identifier  ExFiles\Box 10\5\  05-page061
Date  15th April 1937
  
C Rm{William Robotham - Chief Engineer}
658.
15. 4. 37.

COMPARATIVE WEIGHTS.

WRAITH AND PHANTOM III PROPELLER SHAFTS.

Wraith.
Hardy Spicer N.S.5024 (supplied by makers) - 36/0888 = 21 lbs. 5 oz.

Phantom III.
Std. to LOP.G.82089. (less damper) = 26 lbs. 2 ozs.
Hardy Spicer N.S.5029 (supplied by makers). = 22 lbs. 15 ozs.
Saving in Weight = 3 lbs. 3 ozs.

R.{Sir Henry Royce} Hollingworth.
  
  


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