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 chart of technical specifications and performance data for various American and Rolls-Royce cars.
| Identifier | WestWitteringFiles\U\August1930-November1930\ Scan029 | |
| Date | 26th August 1930 guessed | |
| TYPE OF CAR, TYPE OF BODY, WT OF COMPLETE CAR AS TESTED DIMENSION OF MATRIX, WATER CAPACITY OF SYSTEM TYPE OF 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 PER MILE VOLUME PER 1000 LITRES DISP PER MILE TOP WATER TEMP ATTAINED CONST. SPEED 60 MPH LAP SPEED M.P.H MARMON 8.79 SEDAN 5 SEATER RAC. RATING 32.5 DISP. 4960 C.C WT. OF CAR 4200 LBS 1.87 TONS COMP RATIO 5.5-1 DEPTH OF MATRIX 2.75 AREA 480 ☐" VOLUME 1320 INS³ WATER CAPACITY 7 GALLS. ZIG ZAG RIBBON WITH INDIRECT FINS CANVASS RUBBER BELT 4 BLADED CRANKSHAFT SPEED 4.45-1 TYRE ROLLING CIRC. 30 LBS/☐" 91.50 CYL. BLOCK 6 1/8" FROM MATRIX DASH AIR GAPS BONNET VENTILATED WITH 9 HORIZONTAL LOUVRES PER SIDE 4.5' LONG 12" ABOVE MATRIX FREE FROM OBSTRUCTION 4,070 7625 63.0 173 85°C AT 53 MPH ENGINE PERFORMANCE UNSATISFACTORY 67 M.P.H ESTIMATED HISPANO 1927 2 SEATER COUPE DISP 6597 C.C WT OF CAR 5160 LBS 2.30 TONS DEPTH 4.00" AREA 530 ☐" VOL 2120 INS³ ZIG ZAG RIBBON WITH INDIRECT 4 BLADED FAN 9" LONG 3.365-1 106 AT 50 LBS/☐" HIGH PRESS TYRES FITTED NO UNDERSHIELD VENTILATION BONNET VENTILATION 20 LOUVRES PER SIDE 14.5" LONG 3,000 6860 77.2 309 74°C 85 M.P.H C.O. OPEN 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 DEPTH 3.375 AREA 390 ☐ INS VOL 1318 INS³ VOL 114 CU INS FILM TYPE MATRIX TUBE PITCH .5" 4 BLADED FAN BLADES 8.5" LONG 1.75" FROM RAD. DRIVEN BY FLAT CANVASS RUBBER BELT 1.5" WIDE OFF WATER PUMP SHAFT 3.643-1 TYRE CIRCUM AT 30 LBS/☐" 91.0 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 ENGINE 10.0" FROM RADIATOR. 3260 6,000 65.0 220 77°C 71.66 M.P.H 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 DEPTH 2.375 AREA 525 ☐" VOL 1246 INS³ 4.75" DEEP ZIG ZAG RIBBON WITH INDIRECT VOL 310 CU: INS: 6 BLADED FAN BLADES 10" LONG 1" FROM RAD. FAN DRIVEN AT ENGINE SPEED BY CANVASS RUBBER BELT WHICH ALSO DRIVES WATER PUMP & DYNAMO. 4.5-1 GOODRICH 7"x18" CIRCUM @ 30 LBS/☐" 93" WATER CAPACITY 3.25 GALLS 2" DIA HOLES BONNET 4 SHUTTERS / SIDE 7"x4" APPROX. 4,150 9630 54.4 129 82°C 69.5 M.P.H CHRYSLER 75 5 SEATER SEDAN 3657 LBS 1.63 TONS 3.375 x 5 C.C. DISP COMP RATIO 5-1 DEPTH 2.5 FRONT AREA 458 ☐" VOLUME 1146 INS³ 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 BLADES 8" LONG LEADING EDGE .5" FROM RADIATOR FAN 1.3 TIMES ENGINE SPEED. 3.9-1 EFFECTIVE CIRCUM 91.0" @ 30 LBS/☐" UNDERSHIELD COMPLETE TO WITHIN 1'0" OF THE DASHBOARD NO GEARBOX UNDERSHIELD. CLEAR GAP OF 8.0" EACH SIDE FOR AIR TO GET AWAY UNDER THE DASH BENEATH FLOORBOARDS. LOUVRES 13.5" LONG 20 PER SIDE. 3,410 C.C LATEST 77 CHRY 3590 5540 82.7 207 73°C 66.9 M.P.H 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 DEPTH 4.0" FRONTAL AREA 630 ☐" VOLUME 2520 INS³ TOP TANK VOLUME N. SCH 2951 376 CU. INS. WATER CAP. RAD 4.55 GAL TOTAL WATER CAP OF THE SYSTEM 7.30 G CAP OF ENGINE 2.75 G FAN BLADES 11" LONG LEADING EDGE 1.5" FROM RAD. FAN DRIVEN AT ENGINE SPEED 3.727-1 EFFECTIVE CIRCUM 102.5 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. 3,670 8850 71.2 285 NOT YET ACCURATELY RECORDED. 82.5 M.P.H C.O. OPEN 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 DEPTH 3.700 E.55062 FRONTAL AREA 457 ☐" VOLUME 1695 INS³ WATER CAP RAD 3.375 G TOTAL WATER CAP SYSTEM 4.685 GAL TOTAL VOL APPROX TOP TANK 233 CU: INS: FAN BLADES 9.00" LONG FAN DRIVEN 1.23 TIMES ENGINE SPEED 4.545-1 EFFECTIVE CIRCUM 96.0" 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. 3,175 5500 83.0 308 71°C 64 M.P.H | ||