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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).
Tests on different body mountings to improve vehicle quietness and steering stability.

Identifier  ExFiles\Box 133\4\  scan0327
Date  4th May 1939
  
1W24 + 800.

COPY FOR FILES.

To Rm.{William Robotham - Chief Engineer} from Rm{William Robotham - Chief Engineer}/Caswell. 4.5.39.

RE BODY MOUNTINGS - 1.B.50.

The following tests of different body mountings were made in an endeavour to determine the most suitable type to obtain quietness in body and stability in steering.

Using "rubber insertion" mountings during the 1st. series of tests and "Metalastik" in the 2nd. over 26 separate runs were made, full details being entered in Log Book No.111.

In connection with the "Rubber insertion" the best results for quietness were obtained by using these fittings at frame brackets Nos. 2, 4, 7 and 8 counting from the rear. (Nos.7 and 8 are those used to support dash and cowl).

The bolts used were not insulated from the metal brackets so that body and frame had metallic connections at the 2 bolts used in each support.

At frame brackets Nos. 5 and 6 soft rubbers were forced in to give additional support. Their removal produced an increase in gear and body noise which was found to vary according to whether passenger sat in front or rear seat.

An investigation of this matter showed that part of the steel floorboard fouled the gearbox.

Raising rear of floorboard on 1/4" cork strips so as to completely clear gearbox removed the 2nd. gear vibration and also improved the general tone of the box.

From this it would appear that the chief virtue of using the rubbers mentioned under supports Nos. 5 and 6 consisted in preventing metal board from fouling gearbox.

With the body mounted as described, the steering felt sage and stable up to 80 m.p.h., higher speeds not being possible on account of road surface and conditions.

The bad "nibbling" action so noticeable on Wraith 28.G. was absent and notwithstanding a considerable amount of slack in the worm and steering gear itself was, we thought, a distinct improvement.

Incidentally, the steering on 2.B.50 feels much better than 1.B.50.
  
  


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