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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 cooling system specifications and performance for various motor cars.

Identifier  ExFiles\Box 29\3\  Scan280
Date  1st January 1929
  
TABLE HEADERS:

COLUMN 1: TYPE OF CAR, DISPLACEMENT, TYPE OF BODY, WT OF COMPLETE CAR AS TESTED
COLUMN 2: DIMENSION OF MATRIX, WATER CAPACITY OF SYSTEM
COLUMN 3: TYPE OF TOP MATRIX TANK DIMENSIONS
COLUMN 4: FAN AND DRIVE
COLUMN 5: DIRECT DRIVE RATIO AND EFFECTIVE TYRE CIRCUMFERENCE
COLUMN 6: BONNET VENTILATION AND DISPOSITION OF UNDERSHIELDS
COLUMN 7: MIXTURE DISPLACEMENT PER TON PER MILE
COLUMN 8: MIXTURE DISPLACEMENT PER MILE
COLUMN 9: FACE AREA PER 1000 LITRES DISP. PER MILE ▢"
COLUMN 10: VOLUME PER 1000 LITRES DISP. PER MILE INS³
COLUMN 11: TOP WATER TEMP ATTAINED CONST. SPEED 60 M.P.H
COLUMN 12: LAP SPEED M.P.H

TABLE DATA:

ROW 1:
- CAR: MARMON 8-79, SEDAN 5 SEATER, 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: DEPTH OF MATRIX 2.75", AREA 480 ▢", VOLUME 1320 INS³, WATER CAPACITY 7 GALLS
- TANK: ZIG ZAG RIBBON WITH INDIRECT FINS
- FAN: 4 BLADED, CRANKSHAFT SPEED, CANVAS RUBBER BELT
- DRIVE RATIO: 4.45-1, TYRE ROLLING CIRC. 30 LBS/▢", 91.50
- VENTILATION: BONNET VENTILATED WITH 9 HORIZONTAL LOUVRES PER SIDE 41.5" LONG. 12" ABOVE MATRIX FREE FROM OBSTRUCTION. CYL. BLOCK 6 & 8" FROM MATRIX.
- MIXTURE/TON/MILE: 4070
- MIXTURE/MILE: 7625
- FACE AREA: 63.0
- VOLUME: 173
- TEMP: 85°C AT 53 MPH, ENGINE PERFORMANCE UNSATISFACTORY
- LAP SPEED: 67 M.P.H ESTIMATED

ROW 2:
- CAR: HISPANO 1927, 2 SEATER COUPE, DISP 6597 C.C, WT. OF CAR 5160 LBS, 2.30 TONS
- MATRIX: DEPTH 4.00", AREA 530 ▢", VOL 2120 INS³
- TANK: ZIG ZAG RIBBON WITH INDIRECT
- FAN: 4 BLADED FAN, 9" LONG
- DRIVE RATIO: 3.365-1, 106 AT 50LBS/▢", HIGH PRESS TYRES FITTED
- VENTILATION: NO UNDERSHIELD VENTILATION, BONNET VENTILATION 20 LOUVRES PER SIDE 14.5" LONG
- MIXTURE/TON/MILE: 3,000
- MIXTURE/MILE: 6860
- FACE AREA: 77.2
- VOLUME: 309
- TEMP: 74°C
- LAP SPEED: 85 M.P.H C.O. OPEN

ROW 3:
- 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: DEPTH 3.375", 390 ▢ INS, 1318 INS³
- TANK: VOL 114 CU INS, FIN & TUBE, MATRIX TUBE PITCH .5"
- FAN: 4 BLADED FAN, BLADES 8.5" LONG, 1.75" FROM RAD:, DRIVEN BY FLAT CANVAS RUBBER BELT 1.5" WIDE OFF WATER PUMP SHAFT
- DRIVE RATIO: 3.643-1, TYRE CIRCUM AT 30 LBS/▢", 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/TON/MILE: 3260
- MIXTURE/MILE: 6,000
- FACE AREA: 65.0
- VOLUME: 220
- TEMP: 77°C
- LAP SPEED: 71.66 M.P.H

ROW 4:
- CAR: PIERCE ARROW, 6 SEATER LIMOUSINE, 3.5" x 5" 8 CYL, WHEELBASE 144", DISP 6300 CC., WT OF CAR 5200 LBS, 2.32 TONS, COMP RATIO 5.07-1
- MATRIX: DEPTH 2.375, AREA 525 ▢", VOL 1246 INS³
- TANK: 4.75 DEEP, ZIG ZAG RIBBON WITH INDIRECT, VOL 310 CU: INS:
- FAN: 6 BLADED FAN, BLADES 10" LONG, 1" FROM RAD:, FAN DRIVEN AT ENGINE SPEED BY CANVAS RUBBER BELT WHICH ALSO DRIVES WATER PUMP & DYNAMO
- DRIVE RATIO: 4.5-1, GOODRICH 7"x18", CIRCUM @ 30 LBS/▢" 93", WATER CAPACITY 3.25 GALLS
- VENTILATION: 2" DIA HOLES, BONNET 4 SHUTTERS / SIDE, 7"x4" APPROX.
- MIXTURE/TON/MILE: 4,150
- MIXTURE/MILE: 9630
- FACE AREA: 54.4
- VOLUME: 129
- TEMP: 82°C
- LAP SPEED: 69.5 M.P.H

ROW 5:
- CAR: CHRYSLER 75, 5 SEATER SEDAN, 3657 LBS, 1.63 TONS, 4075 CC DISP, COMP RATIO 5-1
- MATRIX: DEPTH 2.5", FRONT AREA 458 ▢", VOLUME 1146 INS³
- TANK: TANK EXTENSION BEHIND BONNET, TOTAL TOP TANK VOLUME 273 CU INS APPROX, WATER IN RAD 2.2 GAL, TOTAL WATER CAP OF SYSTEM 3.5 GAL
- FAN: FAN BLADES 8" LONG, LEADING EDGE .5" FROM RADIATOR, FAN 1.3 TIMES ENGINE SPEED.
- DRIVE RATIO: 3.9-1, EFFECTIVE CIRCUM 91.0"@ 30 LBS/▢"
- VENTILATION: UNDERSHIELD COMPLETE TO WITHIN 3.0" OF THE DASHBOARD. UNDERSHIELD CLEAR GAP OF 80 ▢" EACH SIDE FOR AIR TO GET AWAY. NO GEARBOX UNDERSHIELD. LOUVRES 13 1/2" LONG 20 PER SIDE.
- MIXTURE/TON/MILE: 3,410 C.C, LATEST 77 CHRY, 3590
- MIXTURE/MILE: 5540
- FACE AREA: 82.7
- VOLUME: 207
- TEMP: 75°C
- LAP SPEED: 66.9 M.P.H

ROW 6:
- CAR: ROLLS ROYCE 40/50, 7 SEATER CABRIOLET, 7668 CC DISP, WT. 5400 LBS, 2.41 TONS, RATING 44 H.P., COMP RATIO 4.6-1
- MATRIX: DEPTH 4.0", FRONTAL AREA 630 ▢", VOLUME 2520 INS³
- TANK: TOP TANK VOLUME N.SCH 2951 376 CU. INS:, WATER CAP RAD 4.55 GAL, TOTAL WATER CAP OF THE SYSTEM 7.30 CAP OF ENGINE 2.75G
- FAN: FAN BLADES 11" LONG, LEADING EDGE 1.5" FROM RAD:, FAN DRIVEN AT ENGINE SPEED
- DRIVE RATIO: 3.727-1, EFFECTIVE CIRCUM 102.5
- VENTILATION: TWO (AND SHORTLY 4) BONNET SHUTTERS AS STANDARD 2 PER SIDE 10"x4". NO VENTILATION BETWEEN RAD & ENGINE WHEELCASE. LOUVRES IN ENGINE SIDE GUARDS 8/SIDE 5" WIDE BUT NOT IN A VERY EFFECTIVE POSITION. AIR EXIT UNDER DASH OBSTRUCTED ON N.S BY MAG & ENGINE FOOT O.S BY CARB. OIL FILLER HORN & PETROL FILTER.
- MIXTURE/TON/MILE: 3,670
- MIXTURE/MILE: 8850
- FACE AREA: 71.2
- VOLUME: 285
- TEMP: NOT YET ACCURATELY RECORDED
- LAP SPEED: 82.5 M.P.H C.O. OPEN

ROW 7:
- 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: DEPTH 3.700, FRONTAL AREA 4.57 ▢", VOLUME 1695 INS³, E.{Mr Elliott - Chief Engineer} 55062
- TANK: WATER CAP RAD 3.375G, TOTAL WATER CAP SYSTEM 4.685GAL, TOTAL VOL APPROX, TOP TANK 233 CU: INS:
- FAN: FAN BLADES 9.00" LONG, FAN DRIVEN 1.23 TIMES ENGINE SPEED
- DRIVE RATIO: 4.545-1, EFFECTIVE CIRCUM 96.0"
- VENTILATION: NO BONNET VENTILATION FITTED AS STANDARD. NO VENTILATION BETWEEN RAD & ENGINE WHEELCASE. 6 LOUVRES/SIDE IN ENGINE GUARDS. FACILITIES FOR GETTING AIR AWAY UNDER DASH BETTER THAN 40/50 BUT WORSE THAN MOST AMERICAN CARS.
- MIXTURE/TON/MILE: 3,175
- MIXTURE/MILE: 5500
- FACE AREA: 83.0
- VOLUME: 308
- TEMP: 71°C
- LAP SPEED: 64 M.P.H
  
  


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