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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).
Letter from Ferodo Limited discussing alternative materials and a trial for Goshawk 11 clutch discs.

Identifier  ExFiles\Box 26\4\  Scan136
Date  5th October 1921
  
R R 255a (100 T) (S. H.{Arthur M. Hanbury - Head Complaints} 159. 11-8-20) G.{Mr Griffiths - Chief Accountant / Mr Gnapp} 2800

COPY OF LETTER FROM:-

FERODO LIMITED.

SOVEREIGN MILLS,

CHAPEL-EN-LE-FRITH.

Ref. SALES DEPT.
FJF/DHL.

5th October 1921.
(Wednesday)

Messrs. Rolls-Royce Ltd.,
Nightingale Road,
D E R B Y.

Dear Sirs,

re:- GOSHAWK 11. CLUTCH DISCS.

We thank you for your letter in reference to above details (Ref:- Wa{Mr Wallis}/Dn18/HP.31021).

The particular material mentioned by the writer as an alternative to FEROBESTOS was FERODO BONDED ASBESTOS made up into a circle from strip with close butt joint firmly secured with fine metal stitches. Plate clutch linings of this character are employed in immense numbers and are invariably satisfactory; the fact of the material being jointed makes no difference whatever to their functioning, and if considered necessary, the metal stitches can be taken out when the lining is riveted up in place.

FERODO BONDED ASBESTOS has a higher co-efficient of friction than FEROBESTOS, and has the advantage of not losing friction value when heated up to, say 350°F, also is approximately 25% cheaper than FEROBESTOS for same dimensions - while perhaps not quite so highly resistant to wear as the latter - a pair of linings should last under ordinary working conditions for several years.

As FEROBESTOS does not appear to you altogether satisfactory, we think you should give the alternative suggestion a careful trial, for which purpose we are preparing four linings 10.5" outside diameter, 7" inside diameter, 3/16" thick. We have no dies to produce 8.4" bore, but the smaller bore will make no really material difference except that as the mean diameter is reduced, a small additional clamping pressure is required over what would obtain with a bore 8.4" diameter. In any case, the pressure required

CONTD.
  
  


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