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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).
Question and answer document discussing design choices for the rear axle, propeller shaft, exhaust, and petrol systems.

Identifier  ExFiles\Box 65a\3\  scan0338
Date  6th October 1932 guessed
  
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Q. Rear Axle and Propeller Shaft. What are your views with regard to the torque tube controlled rear axle as against the Hotchkiss drive as at present used ? The torque tube control claims are: definite control when braking, reduces the effect of brakes being pulled on or off when the axle twists, deletes mechanics joints and enables the propeller shaft to be automatically (or centrally) lubricated. Quote examples other than our own R.R. experience in your reply.

A.{Mr Adams} We are greatly inclined to support the proposal to return to the torque-tube having regard to up-tp-date methods of lubrication and higher engine speeds, also necessity for avoiding cardenshaft whirling in addition to the obvious advantages referred to. We note that among others the following high powered cars employ torque-tubes.

Alfa Romeo. Mercedes
Hispano. Panhard.
Issotta. Renault.
Itala. Talbot.
Lincoln (12) Voisin.
Maybach Cadillac.

Q. Any other points on the rear axle.

EXHAUST SYSTEM.

Q. 1. Noise. Have you any criticism with regard to exhaust noise, quote any other make with a quiet exhaust.

A.{Mr Adams} We must always seek to improve sounds from exhaust.

A.{Mr Adams} 2. Cut Out. Do you think an exhaust cut-out is in general demand.

A.{Mr Adams} Continental only.

PETROL SYSTEM.

Q. 1. Tank Capacity. Do you think this is sufficient ? What mileage should be possible on a full tank ?

A.{Mr Adams} A run of 250 miles on a tank should be possible when
  
  


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