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).
Bench tests for an improved friction drive on a Bentley starter.
| Identifier | ExFiles\Box 62\1\ scan0202 | |
| Date | 20th November 1933 | |
| 86134 E.{Mr Elliott - Chief Engineer} From Hs{Lord Ernest Hives - Chair}/Wst. c. to Sg.{Arthur F. Sidgreaves - MD} c. to Wor.{Arthur Wormald - General Works Manager} c. to By.{R.W. Bailey - Chief Engineer} c. to EN. Hs{Lord Ernest Hives - Chair}/Wst.1/MA.20.11.33. IMPROVED FRICTION DRIVE FOR INCREASED TORQUE BENTLEY STARTER. We have carried out bench tests on this new drive to R.H.Sch.417 and motors equipped with this drive have been fitted to Experimental Bentley Chassis 1.B.IV and 3.B.II. The bench tests consisted of a 1000 starts with the brake wheel loaded to practically the stalling point of the motor. By means of an automatic relay arrangement the motor continued working intermittently with short breaks to allow cooling. At the conclusion the drive was dismantled and with the exception of a slight burr on the quick starts thread was in satisfactory condition. This burr on the thread suggests that a harder material could be used with advantage for the thread sleeve as if the burr increases the drive will become tight on the thread. Efficiency tests taken with the lower gear ratio as standardized on the Bentley shew a low mechanical efficiency of only 73%. Hs{Lord Ernest Hives - Chair}/Wst. | ||