Chart comparing overheating test results for the Silver Ghost and Hispano Suiza models.
| Identifier | ExFiles\Box 24\5\ Scan060 | |
| Date | 15th May 1925 | |
| OVERHEATING TESTS SILVER GHOST(1907 40/50 historic RAC 15,000 miles trial) AND HISPANO SUIZA CONDITIONS OF TEST ATMOSPHERIC TEMPERATURE AT WHICH THE COOLING WATER WILL INEVITABLY BOIL DRIVING FOR SUFFICIENTLY LONG ON FULL THROTTLE AT THE SPEED AND UNDER THE CONDITIONS SPECIFIED N.B. ENGINE WILL NOT BOIL AT TEMPERATURES COVERED BY LINES DEGREES CENTIGRADE 5 10 15 20 25 30 35 40 40/50 SILVER GHOST(1907 40/50 historic RAC 15,000 miles trial) 48 TUBES 21 1/4" MATRIX HEIGHT ROAD SPEED 30 M.P.H. STANDARD VENTILATION 4'X10 S TEST CONDITIONS (SILVER GHOST(1907 40/50 historic RAC 15,000 miles trial)): - NO FAN - STANDARD NO VENTILATION - REAR SHUTTERS OPEN - FRONT SHUTTERS OPEN - ALL SHUTTERS OPEN - LOUVRES BONNET - BONNET TOP OFF - BONNET SIDES OFF HISPANO SUIZA LOUVRES STANDARD ROAD SPEED 30 M.P.H. TEST CONDITIONS (HISPANO SUIZA): - NO FAN - STANDARD STAMPED TEXT: R.D.D. Pr. {Percy H. Rose} 15 MAY 1925 De. HANDWRITTEN TEXT: 14/5/25 B-M | ||
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).