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).
Graph showing the hydraulic restriction of a parallel square tube radiator, plotting delivery and pump suction pressure against engine RPM.
| Identifier | ExFiles\Box 29\3\ Scan293 | |
| Date | 14th October 1930 | |
| HYDRAULIC RESTRICTION OF ☐ TUBE RADIATOR RAD E.{Mr Elliott - Chief Engineer} 77675 TUBES E.{Mr Elliott - Chief Engineer} 81385 6M/M PARALLEL SQUARE DELIVERY GAL/MIN ENGINE R.P.M. SUCTION SIDE OF PUMP LBS/☐" PRESS. DEPN. 6/7 1/2 TUBES ON SAME ENGINE SUCTION SIDE OF PUMP | ||