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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 on the spare wheel carrier, bumpers, dynamo, starter motor, and automatic switch.

Identifier  ExFiles\Box 11\3\  03-page234
Date  20th July 1930 guessed
  
-12-

REAR SPARE WHEEL CARRIER TO L.O.P. D.72583.-

The fitting of the bumpers to the rear of the car makes the lifting out of the spare wheel very difficult for one person, the weight and increased height being the cause. The anchorage of the spare wheel has remained O.K., the wheel has not on any occasion become loose.

BUMPERS.-

These have not been tested for protection, as no occasion has arisen. They are still intact and give no sign of weakness.

DYNAMO TO SUIT HALF CHARGE SCHEME.-

The output of the dynamo is as follows:-

Half charge: 20 M.P.H. Cuts in
30 M.P.H. 5.5. amps.
40 M.P.H. 8.0 amps.
50 M.P.H. 8.5 amps.
60 M.P.H. 8.5 amps/
70 M.P.H. 8.5 amps.
75 M.P.H. 7.5 amps.

With head, side, tail and facia lamps on:-

20 M.P.H. 7.5 amps. discharge
30 M.P.H. 2.0 " "
40 M.P.H. 2.0 " "
50 M.P.H. 3.0 " "
60 M.P.H. 3.5 " "
70 M.P.H. 4.0 " "

The dynamo brushes have, during the latter part of the mileage, been rather noisy. A light clicking sound is heard which gives an impression that the commutator segments have become uneven.

STARTER MOTOR.-

We had considerable trouble with the starter motor not engaging during the first part of the test. We eventually found that it was due to an unevenness of the flywheel gear ring, the gearing at this portion being too deep in mesh, and the motor pinion would not engage. The engine generally stopped with this portion in position. We have practically overcome it by easing the bottom of the teeth both of the pinion and flywheel gear ring.

AUTOMATIC SWITCH TO L.O.P. D.71810.-

This has given no trouble. The contact points are O.K.
  
  


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