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).
Test report comparing leather and bottom belting materials for clutches on a dynamometer.
| Identifier | ExFiles\Box 74\2\ scan0112 | |
| Date | 28th March 1912 | |
| R.R. 148 (20 H) (X 594. 6.2 12) G 2370) X356 1125 Test of material for Clutches / 28/3/12 on Dynamometer on 1426 car bonneted body Leather commenced 100°F.{Mr Friese} bottom belting commenced 80°F.{Mr Friese} Table Data: Left Side (Leather Test): Column Headers: Start, Temp. of test, Remarks Row 185: Start O.K. Row 231: Start O.K., Temp 115°F Row 280: Start just start Row 298: Start just start, Temp 170° Row 310: Start no, Temp 210° Remarks for Leather (spanning multiple rows): Slipped considerably foot pedal rose to footboards. Wearing rapidly.. Lift weights will not start - clutch slips altogether, burnt out. no further good. Smells. Note below Leather test: dismantled found leather all charred, etc. Right Side (Bottom Belting Test): Side Note: Gradual on 1st gear up to 5500 lbs Row 185: O.K. Row 231: O.K. Row 280: O.K., Temp 110°F, Remark: Pedal rose 5/8". allowed to slip a good deal. Value: 1.524 Row 298: O.K., Temp 122°, Value: 1"5 Row 310: O.K., Temp 170°, Remark: Pedal 7/8. slipped a good deal. Value: 4.77 Row 320: O.K., Temp 200°, Remark: Dressing began to smell. 7/8 rise of pedal. Value: 4.5 Row 325: O.K., Temp 226°, Value: .47 Row 330: no., Temp 300°F, Remark: Slipped considerably but would still pull wt. of engine, lifted weights, i.e. max torque. Pedal did not lift much high. Dressing all melted out. Value: 4.44 Note below Bottom Belting test: From blued steel work well all round. Inclined to stick in a little. (over) | ||