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).
Comparative analysis of vehicle cooling systems and performance data for various cars.
| Identifier | ExFiles\Box 92\2\ scan0102 | |
| Date | 23th January 1931 guessed | |
| COLUMN HEADERS: TYPE OF CAR, DISPLACEMENT, TYPE OF BODY, WT OF COMPLETE CAR AS TESTED DIMENSION OF MATRIX, WATER CAPACITY OF SYSTEM. TYPE OF TOP MATRIX TANK DIMENSIONS FAN AND DRIVE DIRECT DRIVE RATIO AND EFFECTIVE TYRE CIRCUMFERENCE BONNET VENTILATION AND DISPOSITION OF UNDERSHIELDS MIXTURE DISPLACEMENT PER TON PER MILE. MIXTURE DISPLACEMENT PER MILE. FACE AREA PER 1000 LITRES DISP SQ IN VOLUME PER 1000 LITRES DISP INS^3 TOP WATER TEMP ATTAINED CONST. SPEED 60MPH LAP SPEED M.P.H. ROW 1: MARMON 8-79 TYPE OF CAR: MARMON 8-79 SEDAN, 3 3/16 X 4 3/4, RAC RATING 32.5, DISP 4960 C.C., WT. OF CAR 4200 LBS, 1.87 TONS, COMP. RATIO 5.5-1 MATRIX/SYSTEM: DEPTH OF MATRIX 2.75, AREA 480 SQ IN, VOLUME 1320 INS^3, WATER CAPACITY 7 GALLS. TOP MATRIX TANK: ZIG ZAG RIBBON WITH INDIRECT FINS FAN AND DRIVE: CANVASS RUBBER BELT, 4 BLADED CRANKSHAFT SPEED DRIVE RATIO/TYRE: 4.45-1, TYRE ROLLING CIRC 30 LBS/SQ IN, 91.50 VENTILATION: BONNET VENTILATED WITH 9 HORIZONTAL LOUVRES PER SIDE 41.5 LONG. 10" ABOVE MATRIX BASE FROM OBSTRUCTION. MIXTURE DISPLACEMENT PER TON PER MILE: 4070 MIXTURE DISPLACEMENT PER MILE: 7625 FACE AREA/1000L DISP: 63.0 VOLUME/1000L DISP: 173 TOP WATER TEMP: 85°C AT 53 MPH, ENGINE PERFORMANCE UNSATISFACTORY. LAP SPEED: 67 M.P.H. ESTIMATED. ROW 2: HISPANO 1927 TYPE OF CAR: HISPANO 1927, 2 SEATER COUPE, DISP 6597 C.C, WT. OF CAR 5160 LBS, 2.30 TONS. MATRIX/SYSTEM: DEPTH 4.00", AREA 530 SQ IN, VOL 2120 INS^3. TOP MATRIX TANK: ZIG ZAG RIBBON WITH INDIRECT FAN AND DRIVE: 4 BLADED FAN, 9" LONG. 1.75" FROM RAD. DRIVEN BY FLAT BELT 1.5" WIDE OFF WATER PUMP SHAFT. DRIVE RATIO/TYRE: 3.365-1, 106 AT 50 LBS/SQ IN, HIGH PRESS TYRES FITTED. VENTILATION: NO UNDERSHIELD VENTILATION, BONNET VENTILATION, 20 LOUVRES PER SIDE 14.5" LONG. MIXTURE DISPLACEMENT PER TON PER MILE: 3,000 MIXTURE DISPLACEMENT PER MILE: 6860 FACE AREA/1000L DISP: 77.2 VOLUME/1000L DISP: 309 TOP WATER TEMP: 74°C LAP SPEED: 85 M.P.H. C.O OPEN ROW 3: GRAHAM PAIGE TYPE OF CAR: GRAHAM PAIGE 3'.5" X 5", 5 SEATER SEDAN, COMP. RATIO 5.35-1, WHEELBASE 121", DISP 4730 C.C., WT OF CAR 4124 LBS, 1.84 TONS. MATRIX/SYSTEM: DEPTH 3.375, 390 SQ INS, 1318 INS^3. TOP MATRIX TANK: VOL 114 CU INS, FIN & TUBE MATRIX TUBE PITCH .5". FAN AND DRIVE: 4 BLADED FAN BLADES 8.5" LONG, LEADING EDGE .5" FROM RADIATOR, FAN 1.3 TIMES ENGINE SPEED. DRIVE RATIO/TYRE: 3.643-1, TYRE CURCUM AT 30 LBS/SQ IN, 91.0. VENTILATION: UNDERSHIELD WELL VENTILATED WITH LOUVRES & FINISHES 4" FORWARD OF THE DASH LEAVING A GAP 7" X 14" FOR AIR TO GET AWAY. BONNET 26 LOUVRES 15" LONG SPACED OVER 19.75. ENGINE 10.0" FROM RADIATOR. MIXTURE DISPLACEMENT PER TON PER MILE: 3260 MIXTURE DISPLACEMENT PER MILE: 6,000 FACE AREA/1000L DISP: 65.0 VOLUME/1000L DISP: 220 TOP WATER TEMP: 77°C LAP SPEED: 71.66 M.P.H. ROW 4: PIERCE ARROW TYPE OF CAR: PIERCE ARROW, 6 SEATER LIMOUSINE, 3'.5" X 5" 8 CYL, WHEELBASE 144", DISP 6300 C.C., WT OF CAR 5200 LBS, 2.32 TONS, COMP. RATIO 5.07-1. MATRIX/SYSTEM: DEPTH 2.375, AREA 525 SQ IN, VOL 1246 INS^3 TOP MATRIX TANK: 4.75" DEEP, ZIG ZAG RIBBON WITH INDIRECT, VOL 310 CU:INS. FAN AND DRIVE: 6 BLADED FAN, BLADES 10" LONG, 1" FROM RAD, FAN DRIVEN AT ENGINE SPEED BY CANVASS RUBBER BELT WHICH ALSO DRIVES WATER PUMP & DYNAMO. DRIVE RATIO/TYRE: 4.5-1, GOODRICH 7" X 18", CIRCUM @ 30 LBS/SQ IN, 83", WATER CAPACITY 3.25 GALLS. VENTILATION: BONNET 4 SHUTTERS / SIDE 7" X 4" APPROX. MIXTURE DISPLACEMENT PER TON PER MILE: 4,150 MIXTURE DISPLACEMENT PER MILE: 9630 FACE AREA/1000L DISP: 54.4 VOLUME/1000L DISP: 129 TOP WATER TEMP: 82°C LAP SPEED: 69.5 M.P.H. ROW 5: CHRYSLER 75 TYPE OF CAR: CHRYSLER 75, 5 SEATER SEDAN, 3657 LBS, 1.63 TONS, 4075 C.C. DISP, COMP. RATIO 5-1. MATRIX/SYSTEM: DEPTH 2.5, FRONTAL AREA 458 SQ IN, VOLUME 1146 INS^3 TOP MATRIX TANK: TANK EXTENSION BEHIND BONNET, TOTAL TOP TANK VOLUME 273 CU: INS APPROX, WATER IN RAD 2.8 GAL, TOTAL WATER CAP OF SYSTEM 3.5 GAL. FAN AND DRIVE: FAN BLADES 8" LONG, LEADING EDGE .5" FROM RADIATOR, FAN 1.3 TIMES ENGINE SPEED. DRIVE RATIO/TYRE: 3.9-1, EFFECTIVE CIRCUM 91.0" @ 30 LBS/SQ IN. VENTILATION: UNDERSHIELD COMPLETE TO WITHIN 3.0" OF THE DASHBOARD NO GEARBOX. UNDERSHIELD CLEAR GAP OF 80 SQ IN EACH SIDE FOR AIR TO GET AWAY. UNDER THE DASH BENEATH FLOORBOARDS NO GEARBOX. UNDERSHIELD LOUVRES 13 1/2" LONG 20 PER SIDE. MIXTURE DISPLACEMENT PER TON PER MILE: 3,410 C.C., LATEST 77 CHRY, 3590 MIXTURE DISPLACEMENT PER MILE: 5540 FACE AREA/1000L DISP: 82.7 VOLUME/1000L DISP: 207 TOP WATER TEMP: 75°C LAP SPEED: 66.9 M.P.H. ROW 6: ROLLS ROYCE 40/50 TYPE OF CAR: ROLLS ROYCE 40/50, 7 SEATER CABRIOLET, 7668 C.C. DISP, WT. 5400 LBS, 2.41 TONS, RATING 44 H.P., COMP. RATIO 4.6-1. MATRIX/SYSTEM: DEPTH 4.0", FRONTAL AREA 630 SQ IN, VOLUME 2520 INS^3 TOP MATRIX TANK: TOP TANK VOLUME N. SCH. 2351, 376 CU. INS., WATER CAP IN RAD 4.5 GAL, TOTAL WATER CAP OF THE SYSTEM 7.30, CAP OF ENGINE 2.75G. FAN AND DRIVE: FAN BLADES 11" LONG, LEADING EDGE 1.5" FROM RAD, FAN DRIVEN AT ENGINE SPEED. DRIVE RATIO/TYRE: 3.727-1, EFFECTIVE CIRCUM 102.5. VENTILATION: TWO (AND SHORTLY 4) BONNET SHUTTERS AS STANDARD. 2 PER SIDE 10" X 4". NO VENTILATION BETWEEN RAD & ENGINE. WHEELCASE LOUVRES IN ENGINE SIDE GUARDS 8 / SIDE 5" WIDE BUT NOT IN A VERY EFFECTIVE POSITION BEING SCREENED BY THE FRONT ENGINE FOOT. AIR EXIT UNDER DASH OBSTRUCTED ON N.S BY MAG & ENGINE FOOT O.S BY CARB. OIL FILLER HORN & PETROL FILTER. MIXTURE DISPLACEMENT PER TON PER MILE: 3,670 MIXTURE DISPLACEMENT PER MILE: 8850 FACE AREA/1000L DISP: 71.2 VOLUME/1000L DISP: 285 TOP WATER TEMP: NOT YET ACCURATELY RECORDED. LAP SPEED: 82.5 M.P.H. C.O OPEN ROW 7: ROLLS ROYCE 25 H.P. TYPE OF CAR: ROLLS ROYCE 25 H.P., 6 SEATER CAB, 3669 C.C. DISP, WT. 3880 LBS, 1.73 TONS, RATING 20 H.P., COMP. RATIO 5.25-1. MATRIX/SYSTEM: DEPTH 3.700, FRONTAL AREA 457 SQ IN, VOLUME 1695 INS^3, WATER CAP SYSTEM 4.685 GAL, TOTAL VOL. APPROX TOP TANK 233 CU: INS. TOP MATRIX TANK: WATER CAP RAD 3.375G. FAN AND DRIVE: FAN BLADES 9.00 LONG, FAN DRIVEN 1.23 TIMES ENGINE SPEED. DRIVE RATIO/TYRE: 4.545-1, EFFECTIVE CIRCUM 96.0". VENTILATION: NO BONNET VENTILATION FITTED AS STANDARD. NO VENTILATION BETWEEN RAD & ENGINE. WHEELCASE 8 LOUVRES / SIDE IN ENGINE GUARDS. FACILITIES FOR GETTING AIR AWAY UNDER DASH BETTER THAN 40/50 BUT WORSE THAN MOST AMERICAN CARS. MIXTURE DISPLACEMENT PER TON PER MILE: 3,175 MIXTURE DISPLACEMENT PER MILE: 5500 FACE AREA/1000L DISP: 83.0 VOLUME/1000L DISP: 306 TOP WATER TEMP: 71°C LAP SPEED: 64 M.P.H. FOOTER: E.{Mr Elliott - Chief Engineer} 55062 | ||