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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 page requesting information on aircraft engine cooling systems and performance parameters for various engine types.

Identifier  ExFiles\Box 173\1\  img431
Date  20th February 1934
  
-2- Hs{Lord Ernest Hives - Chair}/Lov.{Mr Lovesey}5/MJ.20.2.34. Cont'd.{John DeLooze - Company Secretary}

and about 120°C. Tropical. The Std. Fury radiator for the
480 HP. engine is 2.2 sq.ft.

I have given you the above notes so you may see
the lines upon which we are working and we shall be very
interested if you could get any information on the following
points :-

(1) Peak Temps. allowable on climb under max. perm.
power conditions.

(2) Corresponding temp. under cruising conditions.

(3) Size of radiators and power of engine.

(4) Any special streamlining schemes for radiators and
area of air inlet if cowled compared with frontal area
of rad. matrix. (We are trying on the Hart an air
opening of 1.2 sq.ft. for a matrix area of 1.5 sq.ft.).

(5) Any figures for drag - how would these compare with
dragless wing cooling ( The Std. rad. takes about
7 to 8 m.p.h. off the 'Hart'.).

(6) What temps. are the Type Tests run at.

(7) Would like particulars of oil coolers - believe these
are of the honeycomb type. How many sq.ft. required
for engine of Conqueror type. What is their max.
allowable oil inlet temp.

(8) Do the 'Prestone' engines have radiator shutters. We
think these will be probably unnecessary. Have they
by any chance used thermostat by-pass and no shutters?.


This looks rather a formidable list but shall naturally
be very interested in any 'dope' you can pass along.

We are now running a Type Test on Glycol at 94° outlet
for the 90 hrs. endurance and 115°C. for 10 hrs. under take off
conditions at the 600 HP. rating. We are suffering from a Type
Test complex at the moment.

Enclosed are two curves which shew the flight conditions
we are getting on the Hart.

Yours sincerely,
  
  


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