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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).
The turning circles and steering lock for a 20 HP vehicle fitted with front wheel brakes and a new steering system.

Identifier  ExFiles\Box 106\3\  scan0060
Date  15th April 1926
  
To CWB. from Hs.{Lord Ernest Hives - Chair}
c. to DA.{Bernard Day - Chassis Design}
c. to R.{Sir Henry Royce}
X5430
Hs{Lord Ernest Hives - Chair}3/LG15.4.26.

20 HP. STEERING LOCK. X980

CWB2/GM12.4.26.

Below we give turning circles of 20 HP. fitted with front wheel brakes and the reduction when the new steering is fitted. The reduction is caused by the wheel fouling the side steering tube because of the outside pendulum lever on the new steering.

The present standard 20 HP. front wheel lock is 40º on both sides, and gives the following diameter turning circles measured at the hub cap :-

L.H. lock 40 ft. 11 1/4"
R.H. lock 41 ft. 7 1/4"

With the new steering the front wheel R.H. lock is reduced to 33º and the turning circle is increased to - R.H. lock - 47 ft. 8 1/4".

Hs.{Lord Ernest Hives - Chair}
  
  


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