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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).
Issues with the 20 HP spare wheel carrier, including frame torsion and non-rigid components.

Identifier  ExFiles\Box 103\5\  scan0085
Date  19th June 1929
  
To DA.{Bernard Day - Chassis Design} from Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} +5600

Hs{Lord Ernest Hives - Chair}/Rml/LG19.6.29.
19th. June 1929.

20 HP. SPARE WHEEL CARRIER. +5840

The following is a note we have received from Hancock with reference to the spare wheel carrier.

"We have received your Hs{Lord Ernest Hives - Chair}/Rn{Mr Robinson}3/LG14.6.29. re. side spare wheel carrier.
We will look into the question of the carrier and let you have results as soon as possible.
We can give you the information that it is not the frame that is whipping, but entirely the non-rigid qualities of the tubes and discs. The fault lies chiefly in charging the disc and bolt. Further details later".

We feel that even if the tubes were stiffened up the frame might go in torsion because the wheel has been raised giving it a bigger twisting moment about the frame when it is shaken from side to side, as often happens on a bad road.

Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer}
  
  


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