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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).
Letter from the National Advisory Committee for Aeronautics discussing a report on exhaust-valve operation with leaded fuels and combustion chamber design.

Identifier  ExFiles\Box 173\2\  img283
Date  5th March 1934
  
COPY.

National Advisory Committee,
for Aeronautics,
Langley Memorial Laboratory
Langley Field,
Hampton, Va.

5th March, 1934.

Mr. W. A.{Mr Adams} Robotham,
New York Athletic Club,
7th Ave. and 59th St.{Capt. P. R. Strong},
New York City.

Dear Mr. Robotham,

I appreciate your kindness in permitting me to examine the copy of your report on exhaust-valve operation with leaded fuels. In regard to your comments on the disk form of combustion chamber as compared with the spherical or pent-roof form of combustion chamber, I believe that any inferiority of the disk form may be attributed to the decreased flow area obtained with the smaller exhaust valves. I would expect the larger exhaust valve to operate at a lower temperature because of the decreased time in which the exhaust gases are in contact with the exhaust valve. I believe that it is for this reason that Curtiss-Wright stresses the use of large exhaust valves which can be used with either a spherical or pent-roof form of combustion chamber.

Yours very truly,

(Sgd.) Carlton Kemper,

Mechanical Engineer.
  
  


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