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).
Tests comparing two types of Phantom III oil temperature regulators, LeC.3756 and LeC.4386.
| Identifier | ExFiles\Box 131\1\ scan0143 | |
| Date | 11th November 1935 | |
| To E.{Mr Elliott - Chief Engineer} c. to Wor.{Arthur Wormald - General Works Manager} c. to By.{R.W. Bailey - Chief Engineer} Handwritten: X1114 Hs{Lord Ernest Hives - Chair}/Std.28/KW.11.11.35. Report on Tests carried out to date on Ph.III oil Temperature Regulators to LeC.3756 & LeC.4386. The two regulators under test are the original type (LeC.3756) and the modified type with larger tubes and increased oil passages (LeC.4386). The tests carried out were - (1) Comparison of cooling properties and back pressures of the two types of matrix on the engine. This was described in Hs{Lord Ernest Hives - Chair}/Swdl.{Len H. Swindell}2/KW.22.8.35. From this memo., taking the oil flow at 52.5 lbs/min - (this has been calculated from size of pump and experimental figures) - and specific heat of the oil under operating conditions = .47, heats dissipated are - (a) LeC.3756 matrix - 489 B.T.U's/min. (b) LeC.4386 " - 311 " " These are directly comparable, since inlet oil and water temps. are the same in each case, hence the old matrix LeC.3756 dissipates 57% more heat than the new one LeC.4386. The pressure drops across the matrices were as follows - LeC.3756 LeC.4386 4000 r.p.m. - oil hot - inlet 100°C. - 6 lbs/sq.in. 4 lbs/sqin 750 " " cold - " 20°C. -20 " " " 10 " " " (2) Pressure test of LeC.3756 type matrix at atmospheric temperature and 100 lbs/sq.in., leakage occurred at three points on outer ring of tubes. (Note: this matrix was one of the first made and was only hand soldered, not dipped). Buick cooler similarly tested gave no leakage. See memo. Hs{Lord Ernest Hives - Chair}/WB.{Mr Brazier/Mr Bell}13/KW.6.8.35. | ||