Rolls-Royce Archives
         « Prev  Box Series  Next »        

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).
Letter from Dunlop Rubber Co. Ltd. discussing testing and modifications for a new triple stud tyre.

Identifier  ExFiles\Box 53\2\  Scan239
Date  16th September 1926
  
DUNLOP RUBBER CO.,LTD.
TELEGRAPHIC ADDRESS: "DUNLOPS, BIRMINGHAM"
TELEPHONE: BIRMINGHAM CENTRAL 4108 P.B.E. 25 LINES

FORT DUNLOP, ERDINGTON, BIRMINGHAM

YOUR REF: Expl.Dept. Hs{Lord Ernest Hives - Chair}/Rm{William Robotham - Chief Engineer}3/LG.
OUR REF: Local Director.W.H.P.

Handwritten notes:
Top: As/Rm{William Robotham - Chief Engineer}, Please return after perusal, noted By 17-9-26, X4565
Middle: 2-30/M/9/26
Left Margin: [STAMP] RECEIVED 17 SEP 26, By, Expl., 17/9/26, Y45

16th Sept. 1926.

Messrs. Rolls Royce Ltd.
DERBY.

For the attention of Mr. W.A. Robotham.

Dear Sirs:

I have yours of yesterday and I quite understand the situation following your discussion here on Monday, and as I then promised you, I am having prepared a set of the new triple stud type of tyre in the 6.75 section - which design will embody the modifications which I showed to you on a smaller tyre when you were here.

I have no doubt at all from our own test results that you will find these tyres not only equal to, but better than, the traction tread design which you tested with such satisfactory results recently.

We are ourselves carrying out in France some high speed tests on the same tyres, but we want you to have the very earliest opportunity of satisfying yourself.

On the one paragraph in your letter in which you refer to a tendency of the triple stud tread to promote high speed wobbles - I understood you to say when you were here that you had only made one test and that on the 6" section using this pattern, and that on repeating with the 6" tyre in the traction tread you still produced the wobble, and it was only when you used the 6.75 section that you found this trouble eliminated.

I feel sure that the unsatisfactory results on the 6" tyre were mainly - if not entirely - due to too low an inflation pressure for that size, and whilst I agree that a tyre with greater non-skidding
  
  


Copyright Sustain 2025, All Rights Reserved.    whatever is rightly done, however humble, is noble
An unhandled error has occurred. Reload 🗙