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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).
The performance and condition of various vehicle components during testing.

Identifier  ExFiles\Box 71\4\  scan0288
Date  6th July 1925
  
R.R. 493A (50m) (D.B. 175 25-9-24) J.H.D.

EXPERIMENTAL REPORT. -5- Expl. No. REF: GWH{George W. Hancock - Head Chateauroux}1/Crn6.7.25.

rocker shaft pendulum end has increased. We also have an increased loss of oil from flange at base of steering column. Steering column supports on dash are O.K.

Steering. This is still heavy at low speeds, i.e. 6 to 10 m.p.h. after which steering is O.K. At high speeds, over rough roads, violent shocks are felt at steering wheel. Since balancing the front wheels, there has been very little inclination to wobble at speed of 60 to 64 m.p.h. When wheels are out of balance, wobbles are wax violent at this speed. We are, at the present moment, testing with different tyre pressures on front wheels, to find if there is any cause of wobbles due to tyre pressures.

Gearbox. We have had no trouble with this whatsoever. Gears have remained good. On no occasion has any gear jumped out. As previously reported, there is a slight leak of oil from front and rear bearings. Also, after a high speed run, oil leaks slightly from the tower.

Starter motor. This has functioned throughout the test quite O.K. We have had no trouble whatsoever.

Servo & link motion, and servo gears. These are in good condition, and have worked quite satisfactorily. We have noticed no rattle from servo gears.

Sphere and universal coupling. From outside examination, the sphere appears to be quite good. The universal coupling is still O.K.

Engine fabric coupling. This coupling, after 21,624 miles, has not deteriorated since our last report. The fabric is quite sound, and we consider this coupling to be quite O.K.

Clutch. We took the opportunity of dismantling the clutch, and found that the fabric on the pressure plate had sheared off the rivets three quarters of the way round. From the appearance of the fabric, it looked as though the counter-sinking for the rivets was too deep, leaving insufficient fabric to maintain a good hold. We have fitted a new fabric. We also found the distance piece, which is formed like a spring, broken in three places. These were immediately reported to Derby. After re-fitting clutch up, the picking up of same was not so good as previously. The clutch was inclined to be on the fierce side, and jaggered slightly, but it has improved and is now

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