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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 discussing exhaust-valve operation with leaded fuels and combustion chamber forms.

Identifier  ExFiles\Box 173\2\  img278
Date  5th March 1934
  
JOSEPH S. AMES, PH.D., CHAIRMAN
DAVID W. TAYLOR, D.{John DeLooze - Company Secretary} ENG., VICE CHAIRMAN
CHARLES G.{Mr Griffiths - Chief Accountant / Mr Gnapp} ABBOT, SC.D.
GEORGE K.{Mr Kilner} BURGESS, SC.D.
WILLIAM F.{Mr Friese} DURAND, PH.D.
MAJ. GEN. BENJAMIN D.{John DeLooze - Company Secretary} FOULOIS, U.S.A.
REAR ADMIRAL WILLIAM H.{Arthur M. Hanbury - Head Complaints} STANDLEY, U.S.N.
HARRY F.{Mr Friese} GUGGENHEIM, M.A.
ORVILLE WRIGHT, SC.D.

WM. P. MACCRACKEN, JR.{Mr James Royce}, PH.B.
CHARLES F.{Mr Friese} MARVIN, M.E.
REAR ADMIRAL WM. A.{Mr Adams} MOFFETT, U.S.N.
S. W. STRATTON, SC.D.
EUGENE L. VIDAL, C.E.
CHARLES A.{Mr Adams} LINDBERGH, LL.D.
EDWARD P. WARNER, M.S.

NATIONAL ADVISORY COMMITTEE
FOR AERONAUTICS
LANGLEY MEMORIAL AERONAUTICAL LABORATORY
LANGLEY FIELD, HAMPTON, VA.

TELEPHONE HAMPTON 270

IN REPLY
REFER TO No.

March 5, 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,

Carlton Kemper
Carlton Kemper,
Mechanical Engineer.
  
  


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