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).
Steering tests using a snatchmeter to record joggling under various car conditions.
| Identifier | ExFiles\Box 182\M19\ img287 | |
| Date | 7th July 1931 guessed | |
| EX. STEERING TESTS USING SNATCHMETER FOR RECORDING JOGGLING. TABLE DATA: HEADER: TEST NO. | CONDITIONS OF DRIVING | CONDITION OF CAR AS TESTED | STEERING WHEEL MOVEMENT (TURNS) ROW 1: 1 | STEERING WHEEL HELD NORMALLY | FLEXIBLE SHACKLE. FRONT TYRES AT 60 LBS/D". STANDARD ROAD WHEELS. DRILLED DAMPER VALVES. STANDARD SIDE STEERING TUBE. SPRINGS. | 7.42 ROW 2: 2 | AS 1 | AS 1 BUT FRONT TYRE PRESSURES AT 35 LBS/D" | 10.175 | EFFECT OF FRONT TYRE PRESSURES ROW 3: 3 | AS 1 & 2 | AS 1 BUT USING 1" WIDER TRACK WHEELS AT 35 LBS/D" (59.5" FRONT WHEEL TRACK) | 11.43 | EFFECT OF SIDE STEERING TUBE SPRINGS WHEN USING FLEXIBLE SHACKLE ROW 4: 4 | AS 1 to 3 | AS 2 BUT USING SOLID SIDE STEERING TUBE (NO SPRINGS) | 13.3 ROW 5: 5 | WHEEL HELD VERY LOOSELY | AS 2 EXCEPT FOR DRIVING CONDITIONS. (SHOWS EFFECT OF WHEEL CONTROL ON SNATCHMETER READING) | 13.5 | EFFECT OF FLEXIBLE SHACKLE ROW 6: 6 | AS 5 | AS 5 BUT SOLID SHACKLE i.e. STANDARD CAR. | 15.53 ROW 7: 7 | AS 5 & 6 | FLEXIBLE SHACKLE. PLAIN VALVES IN DAMPERS. FRONT TYRES AT 40 LBS/D" | 12.75 | EFFECT OF FRICTION DAMPING IN STEERING COLUMN ROW 8: 8 | AS 5 to 7 | AS 7 BUT WITH 2 LBS FRICTION IN COLUMN. | 8.34 ROW 9: 9 | AS 5 to 8 | AS 7 BUT WITH 4 LBS FRICTION IN COLUMN. | 7.37 ROW 10: 10 | AS 5 to 9 | AS 7 BUT WITH DRILLED DAMPER VALVES. FRONT .055 & .032" DIAM. HOLES. REAR .055" DIAM. HOLE. | 13.32 | EFFECT OF 50LBS FRONT DAMPING BY HARTFORDS ROW 11: 11 | AS 5 to 10 | AS 10 BUT WITH ADDITION OF 50 LBS HARTFORD SHOCK ABSORBER DAMPING ON FRONT AXLE. | 9.01 ROW 12: 12 | AS 5 to 11 | AS 10 BUT WITH DUMBELL FITTED ACROSS FRONT DUMB IRONS TO STOP JELLYING | 11.87 ROW 13: 13 | AS 5 to 12 | FLEXIBLE SHACKLE. DRILLED VALVES. STD WHEELS AT 40 LBS. FRONT 35 LBS/D". REAR TYRE PRESSURES. VERY WORN FRONT TYRE. STD SIDE STEERING TUBE. NO COLUMN DAMPING. | 12.96 ROW 14: 14 | AS 5 to 13 | AS 13 BUT FLEXIBLE SHACKLE MADE SOLID | 16.14 | EFFECT OF FRONT TYRES ROW 15: 15 | AS 5 to 14 | AS 14 BUT USING NEW SILENT TREAD FRONT TYRES | 19.4 ROW 16: 16 | AS 5 to 16 | AS 15 BUT USING NEW TRIPLE STUD TREAD BUTTRESSED TYRES | 18.69 | ||