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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).
Technical note on improving the torsional rigidity of eight-cylinder frames using welded construction.

Identifier  ExFiles\Box 113\5\  scan0148
Date  31th October 1940
  
To Rm{William Robotham - Chief Engineer}

Copy for files
Eight cylinder frames

1 copy typed
for
Frames 1010
Gen.
1 copy for
RM{William Robotham - Chief Engineer}/Chm

It is felt that eight cylinder frames will be liable to hunt and shake when fitted with drop head coupé or sedanca bodies. To overcome this it will be necessary to increase the torsional rigidity between the dash and the front wheels. We consider that the best and simplest way of doing this will be to return to an all welded construction as used on 7-B-V.{VIENNA}
There are three places where the welding is definitely needed, namely between the pan and the side members, between the cross and the side members, and between the gussets and the cross. Having gone so far it would be better to be consistent and throw away all the rivets and have a completely welded construction.

The fact that an all welded frame cracked up on the bump should not be allowed to affect the issue because the bump was then being run at the critical speed of the frame, and it was bound to crack up fairly quickly. In addition we were using 3" cams for bumping while no other manufacturers find it necessary to use more than 2" cams.

On 7-B-V the torsional strength between the dash and the front wheels was 4600 lbs. ft. / degree whilst the best recorded figure on any subsequent frame has been 3850.

P.T.O.
  
  


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