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).
Modifications and road tests concerning shock dampers, brakes, and silencer issues.
| Identifier | ExFiles\Box 1\4\ B001_X 100a-page052 | |
| Date | 21th November 1932 | |
| To Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} From G.W.H. X4057 Hotel de France, Chateauroux, FRANCE. 21.11.32. 2.PER.II. RE. SHOCK DAMPERS. We have, of late, found that the top bolt going through the aluminium bracket F.100254 is continually slack. We have taken one of these brackets off, and we find that it is due to the wearing of the aluminium face, as per sketch attached. We have carried out a road test after fitting the modifications as stated in our report of the 20th inst. The transmission rattle from 16-18 mph. is just noticeable with the gearbox hot. The 10-12 and 30-35 mph. is cured. These results will be noted as further mileage is run. The fitting of the rubber in the rear crossmember has given us a 50% less vibration at the period 58-60 mph, and from 60 mph. onwards of the general roughness. the rubber sandwich we fitted was 1/4" thick, and to get the cross member in we had to compress it 30%. from the results obtained, better results most probably could be obtained if it was not necessary to squeeze the rubber up quite so much. We shall do this if possible. we are however, handicapped by the brake pedal etc, anchored to the rear crossmember. BRAKES. since fitting the increased levers the brakes are considerably better from 20 mph. downwards. there is no appreciable improvement at speeds higher than this in the braking. please note that with these levers fitted, the movement of the brake pedal is too great, and the pedal very easily comes on to the floorboards, and there is no allowance for wear of the brakes. SILENCER. We enclose a sketch showing our method of holding the brake straps solid, still allowing the silencer to swing. This stops the movement of the bands but we have not found any appreciable difference in vibrations etc. G.H.Hancock. G.W.H. | ||