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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).
Calculation of the unsprung weight for a Phantom II rear axle.

Identifier  ExFiles\Box 18\1\  Scan040
Date  4th June 1930 guessed
  
Run from Dy.{F R Danby}
PHANTOM 11 REAR AXLE UNSPRUNG WEIGHT.

Axle as weighed with old wheels (no oil).......... 579 lbs.
Less old wheels................................... 155 lbs.

Weight of axle without oil......................... 424 lbs.
1/4 gallon of oil.................................. 5 "
Two 20" wheels and tyres......................... 172 "
Half weight of prop. shaft......................... 24 "
Half weight of brake ropes......................... 2 "
Two thirds weight of two 1200 lbs. springs......... 108 "
Two thirds weight of spring gaiters................ 3 "

Total 738 lbs.
V

[Handwritten annotations]
136lbs
MX{John H Maddocks - Chief Proving Officer}/
  
  


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