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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).
Data table comparing different types of 25 HP steering gear.

Identifier  ExFiles\Box 28\3\  Scan088
Date  7th January 1935
  
44094
Hs{Lord Ernest Hives - Chair}/FJH.{Fred J. Hardy - Chief Dev. Engineer}12/KW.7.1.35.
25 HP. STEERING GEAR DATA.

Type of Steering Gear.
R.R.
Marles 15/1
Marles 17.5/1
Marles 20.5/1

Standard
..

Pendulum Lever Length - ins.
8.250
7.600
10.15
9.50
10.15
9.50
10.15
9.50

Mid. Position Box Ratio
12.5/1
12.5/1
15/1
15/1
17.5/1
17.5/1
20.5/1
20.5/1

Lock to Lock Box Ratio
11.9/1
11.8/1
14.75/1
14.75/1
17.2/1
17.2/1
20/1
20/1

Turns of Wheels including comp. of S.S.Tubes Springs.
2.31
2.50
2.36
-
2.80
2.98
3.23
3.43

Turns of Wheel without comp. S.S.Tube Springs
2.15
2.31
2.20
2.34
2.58
2.77
2.98
3.20

Movement of Pend. Lever including comp. of Springs.
70.5°
77°
56°
-
56°
59.5°
56°
59.5°

Movement of Pend. Lever without comp.of Springs.
65°
70.5°
51.5°
55.5°
51.5°
55.5°
51.5°
55.5°

Mid. Position Helix Angle.
8.45°
8.45°
11.78°
11.78°
9.97°
9.97°
8.62°
8.62°

Mid. Position Ratio Stg.Wheel to Road Wheels.
12.1/1
13.15/1
11.8/1
12.63/1
13.8/1
14.7/1
16.2/1
17.3/1
  
  


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