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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).
Two schemes for a Wraith radiator steam escape pipe and steam valve.

Identifier  ExFiles\Box 9\3\  03-page112
Date  15th June 1938
  
640

To By.{R.W. Bailey - Chief Engineer} from Rm{William Robotham - Chief Engineer}/Std.
c. Da.{Bernard Day - Chassis Design}
c. RHC.{R. H. Coverley - Production Engineer}

Rm{William Robotham - Chief Engineer}/Std.1/MW.15.6.38.

WRAITH RADIATOR STEAM ESCAPE PIPE
AND STEAM VALVE.

As you are aware the top and tank and fittings for Wraith Radiator are held up beyond the first 100 chassis (we believe, however, that the top tank tools are complete or nearly so), pending a decision to fit a steam valve to the radiator.

We have now tested two schemes -

(1) An escape pipe fitted externally taking off from the offside rear of the top tank (above the calorstat).

(2) A steam valve similar to that shown on SCD.730. (Print attached).

The first scheme has proved very satisfactory, gives no water loss and permits the water level to be maintained at a reasonable height in the filler spout. (In each case the inlet pipe was modified as shown on SCD.730).

The second scheme gave a steam tight valve when new, ran 5,000 miles satisfactorily on 26.G.VI and when tested at the end of the running was a steam tight valve with unaltered blow off pressure. As an additional test we have fitted one of these valves to a car, fixed the shutters in the fully closed position and driven the car with the water boiling. Under these conditions when idling or running at touring speeds, the pressure in the system does not exceed 4 - 5 lbs/sq.in. while if driven flat out for several miles the pressure reaches 9 lbs/sq.in.

With the first scheme tested above, the water loss when boiling is small, only steam being ejected.

Accordingly, we wish to standardise a combination of the above two schemes as shown on SCD.730, together with modified inlet pipe also shown. This scheme is being fitted up on an experimental car 28.G.VI now and will be to all intents and purposes the production one - when detailing for production, however there are several minor improvements which may be made.
  
  


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