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 Goshawk 11 and Gear Box X.4247, identifying a noisy Hyatt roll bearing as the cause of a fault.
| Identifier | ExFiles\Box 75\1\ scan0234 | |
| Date | 20th September 1921 | |
| W.W. 235a 150 T. (S.H. 9062) 6-200S Extract from Hs{Lord Ernest Hives - Chair}2/LG20. 9. 21. 20.9.21. X.4247. Goshawk 11. X.4241. X.4219. X.4252 X.4247. Gear Box. X.4247. We have tested all the ball bearings in the gear box and find that they are reasonably quiet. There is one which we are doubtful of. We proved, however, that the Hyatt roll bearing caused a considerable noise. We feel most probably this will prove to be the cause of one of the noises which was troubling us. To prove this we are fitting a plain bush in place of the roller bearing. We have checked over the alignment of the engine and gear box and also all the parts which could have any affect on the top gear working out. We have not been able to find any reason for this. The second unit which we have been running about on the car, does not have this fault. Hs.{Lord Ernest Hives - Chair} | ||