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).
Propeller shaft wear and an analysis of front and rear brake performance using different shoe materials.
| Identifier | ExFiles\Box 5a\3\ 03-page316 | |
| Date | 20th June 1933 guessed | |
| - 6 - a free movement measured at the periphery of the road wheel of 7/16". This has only increased to 1/2". The clanking when taking up the drive must therefore be a slight slackness in the splines of the axle shafts, the noise being amplified by the brake drums. The anchorage of the axle to the road spring has remained firm. PROPELLER SHAFT LOP.G.54802. Now complete to the above LOP. Ex. Production. The amount of oil added to the mechanics joints has been very small, the front joint has had .038 of a pint the rear joint has had .04 of a pint. No appreciable wear can be detected. The slack measured before and at the finish are as follows: Rear 5/32 start; finish 3/16 Front in top gear 1/32; finish 1/32 " " second " 1/32; " 1/32 " " third " 1/16; " 3/32 This also points to absence of wear in the gears. FRONT BRAKES LOP.G.55813 & REAR BRAKES RR.Sch379. The braking of the car has been generally good. We had during the mileage loss in efficiency through oil getting on to the servo, also grease getting on to the O.S. Front brake. This has not occured again. The brakes were fitted with ANR linings up to 7649 miles. This material wore very little and was in a good condition when taken off. The brake drums were exceptionally good. At this mileage steel rear brake shoes fitted with ferodo linings were fitted and standard aluminium shoes with ferodo linings to the front. This material has worn quicker and has produced bad ridges in the brake drum surfaces. With regard to squeaks from the rear, both materials have had this complaint, the latter if anything has been worse fitted on the steel shoes. The steel shoes were fitted with a view of over coming brake seizures, that were a common complaint with the 25 H.P. car, when brake shoes were set too close. A leverage movement of 7/8" had to be allowed, with the consequent loss to the brake pedal movement to prevent seizures. The seizures were caused by the aluminium shoes expanding by heat generated by slight rubbing. The steel shoes were fitted up with only 1/2" movement of the levers, and no sign of seizure has taken | ||