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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).
Vehicle wobble intensity tests comparing different tyres and dampers.

Identifier  ExFiles\Box 17\3\  Scan029
Date  16th August 1926 guessed
  
GENERAL CONDITIONS.

Standard S.S.Tube, 3500 S.S.Springs, solid cross steering tube; parallel wheels, shock dampers 75 & 35Lbs, tyres, pressure 35 LbsSq.I. Wheels balanced.
Any deviation from this in test specified.

A.{Mr Adams}-COMPARISON of TYRES.

Wobble Intensity.

(I). Dunlop 33x6"Triple stud Well worn. Period 65-58 M.P.H. Spasmodic only. Does not build up

(II). Same as (I). Tyres perfectly new.

(III). Michelin 33x6.75"Tyres. New tread. Wobble period 67-62 M.P.H.

(IV). Standard S.S. CORD tyres at 45 Lbs/Sq.I. No wobble.

B.-COMPARISON of DAMPERS.

Dunlop 33x6" Triple stud well worn tyres at 35 Lbs per Sq.I.

(I). No Dampers. (XY)

(II). Standard dampers. 75&35 Lbs.

(III). Dampers 150 Lbs and 35 Lbs.

(XY). This represents a genuine continuous high speed wobble that builds up.
  
  


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