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 tests conducted on a B.15 unit, comparing four different radiator types.
| Identifier | ExFiles\Box 29\3\ Scan312 | |
| Date | 21th April 1931 guessed | |
| Water Flow Tests on B.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. | Depn. on Suction Side Pump lbs/sq.in. | |---|---|---|---|---| | 500 | .55 | 6.4 | + 3.9 | +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. | Depn. on Suction Side Pump lbs/sq.in. | |---|---|---|---|---| | 500 | .6 | 6.7 | +2.9 | +1.5 | | 1000 | 2.2 | 12.8 | +1.9 | + .95 | | 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 T.81389. | R.P.M. | Diff. across Venturi Ins Hg. | Galls/min. | Depn. on Suction Side Pump Ins. Hg. | Depn. on Suction Side Pump lbs/sq.in. | |---|---|---|---|---| | 500 | .55 | 6.4 | +2.85 | +1.4 | | 1000 | 2.4 | 13.3 | +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. | Depn. on Suction Side Pump 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 | 13.1 | 32.6 | - 8.9 | - 4.35 | | 3000 | 18.7 | 37.4 | -11.4 | - 5.6 | | ||