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).
Table of results from steering tests using a snatchmeter to record joggling under various conditions.
| Identifier | ExFiles\Box 17\4\ Scan020 | |
| Date | 31th August 1931 guessed | |
| 20 Ex. STEERING TESTS USING SNATCHMETER FOR RECORDING JOGGLING TABLE DATA: COLUMN HEADERS: TEST NO, CONDITIONS OF DRIVING, CONDITION OF CAR AS TESTED, STEERING WHEEL MOVEMENT (TURNS) ROW 1: - TEST NO: 1 - CONDITIONS OF DRIVING: STEERING WHEEL HELD NORMALLY - CONDITION OF CAR AS TESTED: FLEXIBLE SHACKLE. FRONT TYRES AT 60 LBS/SQ". STANDARD ROAD WHEELS. DRILLED DAMPER VALVES. STANDARD SIDE STEERING TUBE SPRINGS. - STEERING WHEEL MOVEMENT (TURNS): 7.42 ROW 2: - TEST NO: 2 - CONDITIONS OF DRIVING: AS 1 - CONDITION OF CAR AS TESTED: AS 1 BUT FRONT TYRE PRESSURES AT 35 LBS/SQ" - STEERING WHEEL MOVEMENT (TURNS): 10.175 - SIDE NOTE: EFFECT OF FRONT TYRE PRESSURES ROW 3: - TEST NO: 3 - CONDITIONS OF DRIVING: AS 1 & 2 - CONDITION OF CAR AS TESTED: AS 1 BUT USING 1" WIDER TRACK WHEELS AT 35 LBS/SQ" (59.5" FRONT WHEEL TRACK) - STEERING WHEEL MOVEMENT (TURNS): 11.43 - SIDE NOTES: EFFECT OF 1" WIDER TRACK FRONT WHEELS, EFFECT OF SIDE STEERING TUBE SPRINGS WHEN USING FLEXIBLE SHACKLE. ROW 4: - TEST NO: 4 - CONDITIONS OF DRIVING: AS 1 TO 3 - CONDITION OF CAR AS TESTED: AS 2 BUT USING SOLID SIDE STEERING TUBE (NO SPRINGS) - STEERING WHEEL MOVEMENT (TURNS): 13.3 ROW 5: - TEST NO: 5 - CONDITIONS OF DRIVING: WHEEL HELD VERY LOOSELY - CONDITION OF CAR AS TESTED: AS 2 EXCEPT FOR DRIVING CONDITIONS. (SHOWS EFFECT OF WHEEL CONTROL ON SNATCHMETER READING) - STEERING WHEEL MOVEMENT (TURNS): 13.5 - SIDE NOTE: EFFECT OF HOLDING STEERING WHEEL LOOSELY ROW 6: - TEST NO: 6 - CONDITIONS OF DRIVING: AS 5 - CONDITION OF CAR AS TESTED: AS 5 BUT SOLID SHACKLE i.e. STANDARD CAR. - STEERING WHEEL MOVEMENT (TURNS): 15.53 - SIDE NOTE: EFFECT OF FLEXIBLE SHACKLE. ROW 7: - TEST NO: 7 - CONDITIONS OF DRIVING: AS 5 & 6 - CONDITION OF CAR AS TESTED: FLEXIBLE SHACKLE. PLAIN VALVES IN DAMPERS. FRONT TYRES AT 40 LBS/SQ" - STEERING WHEEL MOVEMENT (TURNS): 12.75 ROW 8: - TEST NO: 8 - CONDITIONS OF DRIVING: AS 5 TO 7 - CONDITION OF CAR AS TESTED: AS 7 BUT WITH 2 LBS FRICTION IN COLUMN. - STEERING WHEEL MOVEMENT (TURNS): 8.34 - SIDE NOTES: EFFECT OF DRILLED VALVES, EFFECT OF FRICTION DAMPING IN STEERING COLUMN. ROW 9: - TEST NO: 9 - CONDITIONS OF DRIVING: AS 5 TO 8 - CONDITION OF CAR AS TESTED: AS 7 BUT WITH 4 LBS FRICTION IN COLUMN. - STEERING WHEEL MOVEMENT (TURNS): 7.37 ROW 10: - TEST NO: 10 - CONDITIONS OF DRIVING: AS 5 TO 9 - CONDITION OF CAR AS TESTED: AS 7 BUT WITH DRILLED DAMPER VALVES. FRONT .055 & .032" DIAM. HOLES. REAR .055" DIAM. HOLE - STEERING WHEEL MOVEMENT (TURNS): 13.32 - SIDE NOTE: EFFECT OF 50LBS FRONT DAMPING BY HARTFORDS ROW 11: - TEST NO: 11 - CONDITIONS OF DRIVING: AS 5 TO 10 - CONDITION OF CAR AS TESTED: AS 10 BUT WITH ADDITION OF 50 LBS HARTFORD SHOCK ABSORBER DAMPING ON FRONT AXLE. - STEERING WHEEL MOVEMENT (TURNS): 9.01 - SIDE NOTE: EFFECT OF DUMBELL ROW 12: - TEST NO: 12 - CONDITIONS OF DRIVING: AS 5 TO 11 - CONDITION OF CAR AS TESTED: AS 10 BUT WITH DUMBELL FITTED ACROSS FRONT DUMB IRONS TO STOP JELLYING - STEERING WHEEL MOVEMENT (TURNS): 11.87 ROW 13: - TEST NO: 13 - CONDITIONS OF DRIVING: AS 5 TO 12 - CONDITION OF CAR AS TESTED: FLEXIBLE SHACKLE. DRILLED VALVES. STD WHEELS AT 40 LBS FRONT 35 LBS/SQ" REAR. TYRE PRESSURES VERY WORN FRONT TYRES STD SIDE STEERING TUBE. NO COLUMN DAMPING. - STEERING WHEEL MOVEMENT (TURNS): 12.96 - SIDE NOTE: EFFECT OF FLEXIBLE SHACKLE ROW 14: - TEST NO: 14 - CONDITIONS OF DRIVING: AS 5 TO 13 - CONDITION OF CAR AS TESTED: AS 13 BUT FLEXIBLE SHACKLE MADE SOLID - STEERING WHEEL MOVEMENT (TURNS): 16.14 ROW 15: - TEST NO: 15 - CONDITIONS OF DRIVING: AS 5 TO 14 - CONDITION OF CAR AS TESTED: AS 14 BUT USING NEW SILENT TREAD FRONT TYRES. - STEERING WHEEL MOVEMENT (TURNS): 19.4 - SIDE NOTE: EFFECT OF FRONT TYRES ROW 16: - TEST NO: 16 - CONDITIONS OF DRIVING: AS 5 TO 16 - CONDITION OF CAR AS TESTED: AS 15 BUT USING NEW TRIPLE STUD TREAD BUTTRESSED TYRES - STEERING WHEEL MOVEMENT (TURNS): 18.69 | ||