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).
Comparing water temperatures and water pump delivery between EAC 'V' series and 40/50 cars.
| Identifier | ExFiles\Box 24\4\ Scan317 | |
| Date | 3rd March 1925 | |
| R.R. 493a (50m) (D.B. 175 25-9-24) J.H.D. -2- Expl. No. REF: Hs{Lord Ernest Hives - Chair}/Rs{Sir Henry Royce's Secretary}/L631.3.25. EXPERIMENTAL REPORT. COMPARISON EAC. AND 40/50 CARS. 30 m.p.h. | 40 m.p.h. EAC. 'V' series. | 28.8°C | 29.9°C 40/50 21 h.p. | 20.5°C | 25.3°C E.A.C. WATER PUMP DELIVERY. These tests were carried out with venturi fitted in bottom water pipe of 44-PK. Standard EAC. 'V' series water system and radiator. Engine run light - water temp. 50°C - 80°C Engine R.P.M. | Difference in levels of two limbs. | Water flow galls/min. | 40/50 flow galls/min. 500 | .26" | 6.85 | 5.5 750 | .66" | 10.92 | 8.3 1000 | 1.30" | 15.31 | 10.5 1250 | 2.00" | 19.00 | 13.0 1500 | 2.90" | 22.85 | 15.0 1750 | 4.10" | 27.20 | 18.0 2000 | 5.30" | 30.95 | 21.0 2250 | 6.60" | 34.60 2500 | 8.05" | 38.20 2750 | 10.00" | 42.50 Law of venturi 13.46 √h.{Arthur M. Hanbury - Head Complaints} | ||