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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).
Mechanical efficiency test results for a Marles Weller Q Type Steering Gear.

Identifier  ExFiles\Box 28\3\  Scan082
Date  11th December 1934
  
x4094
HS{Lord Ernest Hives - Chair}/FJH.{Fred J. Hardy - Chief Dev. Engineer}12/KW.11.12.34.

Mechanical Efficiency of Marles Weller
Q Type Steering Gear.

The Steering Gear on which the following efficiency tests were carried out is one of the two Q type Marles Weller Gears that were tried on Phantom II in 1932-33.

The gear was dismantled, cleaned thoroughly and lubricated with Mobiloil 'D' before being tested.

The results of the tests were as follows :-

All efficiencies measured under static conditions at mid position of travel.

Overall turns of steering wheel = 3.32.
Overall movement of pend. lever = 73°.
Overall ratio of box = 18/1.
Mid. position ratio of box = 17.4/1.
Pendulum lever length = 7.60".

The following table shows the mechanical efficiency at various loads -

| Pendulum Lever Load lbs. | Mechanical Efficiency |
|---|---|---|
| | Forward | Reverse |
| 50 | 48.0 | 35.9 |
| 100 | 53.5 | 32.3 |
| 150 | 52.6 | 32.1 |
| 200 | 52.2 | 33.1 |
| 300 | 51.8 | 33.6 |
| 400 | 52.3 | 32.8 |
  
  


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