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).
Water flow test results for four different radiator configurations on an SS.15 unit.
| Identifier | WestWitteringFiles\W\May1931-August1931\ Scan015 | |
| Date | 19th May 1921 guessed | |
| Water Flow Tests on SS.{S. Smith}15 Unit. Venturi between cylinder head and radiator. Galls/min = 8.64 √H ins Hg. (1) Radiator with .268 (small hexagon tubes.) Tube Piece No. | R.P.M. | Diff. across Venturi Ins Hg. | Galls/min. | Depn. on suction side Pump | |---|---|---|---| | | | | Ins. Hg. | lbs/sq.in. | | 500 | .55 | 6.4 | +2.9 | +1.5 | | 1000 | 2.25 | 13.0 | +1.4 | +.69 | | 1500 | 5.1 | 19.5 | -1.0 | -.49 | | 2000 | 9.3 | 26.4 | -4.1 | -2.0 | | 2500 | 14.8 | 33.3 | -8.5 | -4.15 | | 3000 | 18.5 | 37.2 | -10.6 | -5.2 | (2) Standard radiator with 4 dents in each tube E.79448 | R.P.M. | Diff. across Venturi Ins Hg. | Galls/min. | Depn. on suction side Pump | |---|---|---|---| | | | | Ins. Hg. | lbs/sq.in. | | 500 | .6 | 6.7 | +2.9 | +1.5 | | 1000 | 2.2 | 12.8 | +1.6 | +.78 | | 1500 | 5.5 | 20.3 | -.7 | -.35 | | 2000 | 10.0 | 27.4 | -4.2 | -2.06 | | 2500 | 15.2 | 33.7 | -8.3 | -4.06 | | 3000 | 18.3 | 37.0 | -10.3 | -5.05 | (3) Square tube radiator E.81389. | R.P.M. | Diff. across Venturi Ins Hg. | Galls/min. | Depn. on suction side Pump | |---|---|---|---| | | | | Ins. Hg. | lbs/sq.in. | | 500 | .55 | 6.4 | +2.85 | +1.4 | | 1000 | 2.4 | 13.4 | +1.6 | +.78 | | 1500 | 5.5 | 20.3 | -.8 | -.39 | | 2000 | 10.0 | 27.4 | -3.9 | -1.9 | | 2500 | 15.6 | 34.1 | -7.7 | -3.8 | | 3000 | 20.6 | 39.2 | -10.8 | -5.3 | (4) Radiator with large hexagon tubes .360 across flats | R.P.M. | Diff. across Venturi Ins Hg. | Galls/min. | Depn. on suction side Pump | |---|---|---|---| | | | | Ins. Hg. | lbs/sq.in. | | 500 | .55 | 6.4 | +2.9 | +1.5 | | 1000 | 2.25 | 13.0 | +1.4 | +.69 | | 1500 | 5.2 | 19.6 | -1.3 | -.64 | | 2000 | 9.6 | 26.8 | -4.8 | -2.35 | | 2500 | 15.1 | 33.6 | -8.9 | -4.35 | | 3000 | 18.7 | 37.4 | -11.4 | -5.6 | | ||