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, | ||