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).
Insufficient strength of auxiliary brake shoe springs and the successful test of a heavier replacement.
| Identifier | ExFiles\Box 120\1\ scan0082 | |
| Date | 1st April 1932 | |
| 8461 To By.{R.W. Bailey - Chief Engineer} From HS{Lord Ernest Hives - Chair}/GWH.{George W. Hancock - Head Chateauroux} HS{Lord Ernest Hives - Chair}/GWH.{George W. Hancock - Head Chateauroux}10/MA.1.4.32. Re AUXILIARY BRAKE SHOE. We find that the present springs G.79099 fitted to the Auxiliary Brake Shoe for the rear brakes is not of sufficient strength and groans develop. We also find that the springs quickly take up a set when the brakes are heated up after hard braking. We have tried out a heavier spring which has given good results and which has not taken up a permanent set during the tests. This spring is made of 14.SWG (.080) dia has 4 actual working coils and an extra coil at each end. Its free length is .795 and gives a load of 54 lbs compressed to .500. We should like a number of these springs making for further tests, with a view of standardising them. HS{Lord Ernest Hives - Chair}/GWH.{George W. Hancock - Head Chateauroux} | ||