Specification sheet comparing springing loads and alterations for the New Phantom and 20 HP models.
| Identifier | WestWitteringFiles\O\2January1926-March1926\ Scan20 | |
| Date | 25th January 1926 | |
| NEW PHANTOM(Codename for PHANTOM I) SPRINGING ### FIXED LOADS CHASSIS WT. 4000 LBS. UNSPRUNG WT. FRONT. AXLE WHEELS & TOTAL WT. OF THE SPRINGS. TOTAL WT. 460 LBS. REAR. AXLE WHEELS & NONE OF THE WT. OF THE SPRINGS. TOTAL WT. 610 LBS. - 100 LBS. SPARES. 1/3 ON FRONT. 2/3 ON REAR. - 2 SPARE WHEELS. TAKEN AS 75 LBS. EACH 2/3 ON FRONT 1/3 ON REAR. - ALLOWANCE FOR CHAUFFEUR & TORQUE ON O.S. CHASSIS. - FRONT SPRING 50 LBS. REAR SPRING 100 LBS (LUGGAGE). ### SPRINGS TABLE (LBS) | | FRONT NEAR | FRONT OFF | REAR NEAR | REAR OFF | |---|---|---|---|---| | Fixed Chassis WT Less Unsprung WT | 1060 | 1060 | 940 | 940 | | Unsprung WT on Springs | 230 | 230 | 305 | 305 | | **Subtotal** | **830** | **830** | **635** | **635** | | 100 Lbs Spares | 16 | 16 | 33 | 33 | | Chauffeur & Torque | 50 | 50 | 25 | 25 | | 2 Spare Wheels | | 50 | | 100 | | **Total** | **896** | **946** | **693** | **793** | ### VARIABLE LOADS - TOTAL FIXED UNSPRUNG WT. ON THE 40/50 ALL VARIABLE LOADS, WHETHER PASSENGERS OR LUGGAGE ARE ALLOWED FOR IN FULL. - BODY. TOTAL WT. W LBS. 30% ON FRONT 70% ON REAR. - TOTAL WT. SPRUNG FOR PASSENGERS. No. OF PASS N. EACH PASS IS CONSIDERED AS WEIGHING 154 LBS. 30% ON FRONT. 70% ON REAR. - LUGGAGE. TOTAL WT. P LBS. 30% ON FRONT 70% ON REAR. ### ALLOWANCES. TO TOTALS. - 50 LBS. TAKEN OFF EACH FRONT SPRING. RS {Sir Henry Royce's Secretary} INSTRUCTIONS. (Table: TOTAL -50) - REAR SPRING LOAD MULTIPLIED BY 1.5 BEING CANTILEVER. (Table: X 1.5) - THE REAR SPRING LOAD SHOULD BE DOUBLED TO GIVE CORRECT SPRING LOADING REQD. ACTUALLY THE CAR IS SPRUNG FOR 75% OF LOAD ONLY (RS {Sir Henry Royce's Secretary} INSTRUCTIONS) - 100 LBS. SUBTRACTED FROM EACH REAR SPRING. (Table: -100) - FURTHER SUGGESTION TO IMPROVE SPRINGING ON TOP OF BOW PROPOSED BY "R" ### RATING - THE RATING OF THE FRONT SPRINGS FOR ANY LOAD IS INCREASED 12 1/2%. COMPARED WITH CHASSIS PRIOR TO F.W.B. TYPE. (Table: RATING INCREASED 12 1/2%) ### SPECIAL BODIES - COUPÉS & 2 SEATERS DISTRIBUTION OF BODY WT. 40% FRONT 60% REAR. ### ALTERATIONS FOR ABROAD - AMERICA. AS ABOVE. - FRANCE. ADD 100 LBS. TO EACH REAR SPRING. - AUSTRALIA. ADD 20% TO REAR. - SPAIN. MAKE FRONT SPRINGS 3 1/2 % STRONGER. --- 20 H.P. SPRINGING ### FIXED CHASSIS WTS. LESS UNSPRUNG WT - FRONT 305 LBS. REAR 485 LBS. - INCLUDE TYRES, PETROL, OIL BTY & FILLED WITH WATER. - 1 SPARE WHEEL ON REAR - SPARES, TOOLS, ETC. ### SPRINGS TABLE (LBS) | | FRONT N.S. | FRONT O.S. | REAR N.S. | REAR O.S. | |---|---|---|---|---| | Fixed Chassis Wt Less Unsprung Wt | 500 | 500 | 375 | 375 | | 1 Spare Wheel on Rear | | | 35 | 35 | | Spares, Tools, Etc. | 10 | 10 | 15 | 15 | | **Total** | **510** | **510** | **425** | **425** | ### VARIABLES - BODY WT. W. 75% ON REAR 25% ON FRONT. (Table: .125W Front, .375W Rear) - HALF OF PASS WT. ONLY SPRUNG FOR. No. OF PASS N. WT. OF PASS. PER PASS 154 LBS. 75% ON REAR. 25% FRONT. (Table: .125(77N) Front, .375(77N) Rear) - LUGGAGE IS ALWAYS ALLOWED FOR AS BEING ALL ON THE REAR AXLE & BEING A VARIABLE LOAD, 50% IS TAKEN. WT. OF LUGGAGE P LBS. (Table: P/4 Rear) - SPARE WHEEL ON SIDE. 50 LBS. ALLOWED ON SPRINGS. THIS IS TO KEEP FRONT SPRINGS UP A BIT. (Table: 50 Front) ### ALLOWANCES - ALLOWANCE FOR FRONT BRAKES BEING FITTED TO THE 20 HP. 25% STIFFER FRONT SPRINGS. (Table: 25% STIFFER) ### ALTERATIONS FOR ABROAD - CONTINENT: ADD 10% TO REAR SPRINGS. - AUSTRALIA & SPAIN: 20% STIFFER REAR SPRINGS. - EXCEPTIONAL BODIES: THE WT. OF COUPÉS & 2 SEATERS IS TAKEN AS BEING 40% ON FRONT 60% ON REAR. ### STAMP ROLLS-ROYCE LIMITED. PRINT ROOM 25 JAN 1926 DERBY. | ||
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).