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 steering tests using a snatchmeter to record joggling under various car conditions.
| Identifier | ExFiles\Box 28\5\ Scan071 | |
| Date | 31th August 1981 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 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 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 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 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 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 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 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 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 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 SIDE NOTES: EFFECT OF 1" WIDER TRACK FRONT WHEELS EFFECT OF HOLDING STEERING WHEEL LOOSELY EFFECT OF DRILLED VALVES EFFECT OF DUMBELL EFFECT OF FLEXIBLE SHACKLE EFFECT OF FRONT TYRE PRESSURES EFFECT OF SIDE STEERING TUBE SPRINGS WHEN USING FLEXIBLE SHACKLE EFFECT OF FLEXIBLE SHACKLE EFFECT OF FRICTION DAMPING IN STEERING COLUMN EFFECT OF 50 LBS FRONT DAMPING BY HARTFORDS EFFECT OF FRONT TYRES | ||