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).
Chassis springing instructions and load calculation worksheet for a specific vehicle.
| Identifier | ExFiles\Box 67a\1\ scan0191 | |
| Date | 16th December 1924 | |
| RR 71 (20H) (DB{Donald Bastow - Suspensions} 491 16-12-24) MP 307678 ROLLS-ROYCE LTD. /840 SERIES "W" CHASSIS SPRINGING INSTRUCTIONS. CHASSIS 80-LC. BODY WEIGHTS Wt. | Front | Rear 5 cwt. | 84 | 196 6 ,, | 101 | 235 7 ,, | 118 | 274 8 ,, | 134 | 314 9 ,, | 151 | 353 10 ,, | 168 | 392 11 ,, | 185 | 431 12 ,, | 202 | 470 13 ,, | 218 | 510 14 ,, | 235 | 549 PASSENGER WEIGHTS No. | Front | Rear 2 | 46 | 108 3 | 69 | 162 4 | 92 | 216 5 | 116 | 270 6 | 139 | 323 7 | 162 | 377 NOTE. — In allowing for Passengers max. weights only are used. SPARE WHEELS. — For each Spare Wheel on STEP add 50 lbs. front and 25 lbs rear to that side. REAR, add 37½ lbs. to each rear wheel. BY THIS CHART, SPRINGS ARE FITTED SUITABLE FOR 75% OF MAX. LOAD IN ACCORDANCE WITH R'S INST. (Less 60LBS each Front-Spring) SPRINGS. FRONT. N.S. 1160 + LBS O.S. 1200 + LBS 12½% STIFFER REAR. N.S. 2100 + WIDE O.S. 2200 + WIDE Right side table: G.{Mr Griffiths - Chief Accountant / Mr Gnapp} WHELAN. (U.S.A. AND CONTINENT) | | FRONT | REAR | | | NEAR | OFF | NEAR | OFF | | 1. FIXED CHASSIS WEIGHTS, incl. 300 lbs Spares, 1 cwt. Luggage on Grid | 825 | 875 | 710 | 760 | | 2. VARIABLE LOADS: | | | | | | (a) Body......cwt.... 13½ cwt | 226 | 226 | 530 | 530 | | (b) Passengers—No.... 4 | 92 | 92 | 216 | 216 | | 3. ADDITIONAL LOADS: | | | | | | 2..Spare Wheel(s) on Step | 50 | 50 | 25 | 25 | | ......Spare Wheel(s) on Rear | | | | | | 112..lbs. LUGGAGE IN BODY | 17 | 17 | 39 | 39 | | [Subtotal] | 1210 | 1260 | | | | [Adjustment] | 50 | 50 | | | | Effective Wheel Loads | 1160 | 1210 | 1520 | 1570 | | ADD 50% TO REAR. (less 100lbs) | | | 660 | 685 | | SPRING RATING | 1160 | 1210 | 2180 | 2255 | REMARKS: SIGNED DATE | ||