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).
4-wheel brakes and front axle control, detailing rig and road test results.
| Identifier | ExFiles\Box 66\5\ scan0003 | |
| Date | 1st March 1925 | |
| R.R. 493A (50M) (D.B. 175 25-9-24) J.H.D. EXPERIMENTAL REPORT. Expl. No. 18420 REF. HS{Lord Ernest Hives - Chair}3/LG2. 3.25. To R.{Sir Henry Royce} from Hs.{Lord Ernest Hives - Chair} c. to CJ. BJ. c. to RG.{Mr Rowledge} E.{Mr Elliott - Chief Engineer} c. to DA.{Bernard Day - Chassis Design} BY.{R.W. Bailey - Chief Engineer} c. to Wor.{Arthur Wormald - General Works Manager} S E C R E T. E.{Mr Elliott - Chief Engineer} A.{Mr Adams} C. 4-WHEEL BRAKES - FRONT AXLE CONTROL. We have run a chassis fitted with the front axle control for over 200 hrs. on the bumping rig. We have had no failures with these parts, neither has it affected the average life of the other parts on the chassis. On the road, we have run two cars fitted with this scheme, the total mileage is approximately 6,200 miles. As regards braking, the front axle being controlled certainly increases the safety. The criticism we have against the scheme, is the reduction in ground clearance. The lowest point under the rear bracket for the radius rod, is approximately 7.2" from the ground. On the maximum bump, this is reduced to less than 5". The position of the radius rod brackets is such that if the car was running in ruts, the lowest point would come on the crown of the ruts. Hs.{Lord Ernest Hives - Chair} | ||