Test results for 25 HP clutch springs, including load, deflection, and permanent set measurements.
| Identifier | ExFiles\Box 5\6\ 06-page146 | |
| Date | 17th November 1931 | |
| X5480. 25. H.P. CLUTCH SPRINGS. PLEASE FILE G54132 CLUTCH SPRING TESTS. SPRING RATING. LOAD LB | DEFLECTION-INS. | 1ST TEST | 2ND TEST 4 | 0 | 0 25 | .156 | .143 50 | .341 | .334 100 | .699 | .670 125 | .873 | .867 RATING | 139LB/IN | 139.5LB/IN FREE LENGTH BEFORE 2ND TEST. 3.085" LENGTH CHOC-A-BLOC 2.104" LOAD -- 155LB FREE LENGTH AFTER 2ND TEST 3.076" .009" SET. PERMANENT SET. . SIMILAR SPRING WAS TWICE LOADED CHOC-A-BLOC (160LB), MEASUREMENTS TAKEN BEFORE AND AFTER TEST AT FOUR POINTS, EQUALLY SPACED ROUND THE CIRCUMFERENCE, AND THE AVERAGE DIMENSIONS TAKEN. TEST A. {Mr Adams} FREE LENGTH BEFORE TEST 3.055" } SET .005" " " AFTER " 3.050" } TEST B. " " BEFORE " 3.050" } SET .003" " " AFTER " 3.047" } ANOTHER SPRING WAS TESTED IN THE SAME WAY UNDER NORMAL LOAD (125LB). FREE LENGTH BEFORE TEST 3.046 } SET .002" " " AFTER " 3.044 } | ||
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).