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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).
Technical memorandum discussing Ethylene Glycol cooling, Lead Bronze bearings, and valve performance.

Identifier  ExFiles\Box 173\1\  img099
Date  25th January 1934
  
-3- Ha/Loy.13/AJ.25.1.34. Cont'd.{John DeLooze - Company Secretary}

ETHYLENE GLYCOL.

Shall be very interested for any information you can supply on use of Glycol such as the following :-

(1) What have they fixed as the max. jacket temperatures - such as would be permitted on climb.

(2) Assuming they have Type Tested the Conqueror on Glycol what jacket temperatures did they employ.

(3) What are their normal operating temps. under cruising conditions.

(4) How many sq.ft. radiator required for Conqueror.

(5) Can you get any figures of the difference in drag between water cooled size and Glycol cooled size of radiator.

(6) What oil cooling methods do they employ and what are their max. oil inlet temps.

LEAD BRONZE.

We have tested RHO.'s recommendation of plain bearing with 6 oil holes but it failed on the rig after 1 min. at 2500 RPM.

Some tests here have shewn that on a T.V. dive the engine revs. go up by about 40% above normal.

For American Dive Bombing do they employ variable pitch airscrews? This should be a great advantage in limiting revs.

What is the width and diameter of the Conqueror centre bearing and have they had any experience with wider bearing. From your remark re. thrust bearing should imagine long bearing a disadvantage where distortion is evident.

You remark their bearings look the same as ours after running. We have the feeling that balanced crankshaft - apart from relieving stress in crankcase - has resulted in definitely worse bearings. We think that at High M.E.P. balancing up the inertia loads results in more 'kick' from explosion. Will you ask Curtiss if they have any experience in this direction.
P.S. Have just examined the valves out of Exp.5. Type Test on 4.cc. TEL. - are the best set we have ever had off Type Test. KE.965 Sodium cooled stems with stiff NMC. conical inserts seems to have done the trick. Ha/A.C.Lovesey.
  
  


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