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 for Borg and Beck clutch spring deflection tests for 10' and 11' discs.
| Identifier | ExFiles\Box 129\3\ scan0363 | |
| Date | 29th July 1930 | |
| 1110 BORG AND BECK CLUTCH TESTS SPRING DEFLECTION TESTS. RAD OF MEASURING ARM 3.000" | | DIA OF DISCS 10" | DIA OF DISCS 11" | | TORQUE LB-FT | DEFLECTIONS-INS- | DEFLECTIONS-INS- | | | DISC No 4 | DISC A10 | DISC B10 | DISC No27 | DISC A11 | DISC B11 | | 0 | 0 | 0 | 0 | 0 | 0 | 0 | | 20 | .010 | .013 | .002 | .018 | .002 | .005 | | 40 | .056 | .030 | .019 | .045 | .010 | .019 | | 60 | .095 | .065 | .058 | .075 | .037 | .053 | | 80 | .130 | .112 | .091 | .113 | .076 | .088 | | 100 | .168 | .157 | .132 | .149 | .119 | .130 | | 120 | .204 | .182 | .168 | .182 | .156 | .174 | | 140 | .212 | .197 | .199 | .210 | .191 | .206 | | 150 | .213 | .202 | .204 | .212 | .193 | .207 | | 140 | .213 | .202 | .204 | .212 | .193 | .205 | | 120 | .212 | .202 | .204 | .212 | .190 | .200 | | 100 | .188 | .188 | .174 | .188 | .156 | .155 | | 80 | .155 | .158 | .134 | .152 | .116 | .119 | | 60 | .116 | .116 | .097 | .110 | .072 | .080 | | 40 | .076 | .082 | .057 | .076 | .034 | .043 | | 20 | .038 | .035 | .029 | .039 | .012 | .019 | | 0 | .005 | .011 | .008 | .016 | .002 | .003 | | ||