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).
Tests to eliminate steering drag when braking by comparing large and small diameter tyres.
| Identifier | ExFiles\Box 49\4\ Scan196 | |
| Date | 8th January 1924 | |
| 8.1.24. TESTS UNDERTAKEN TO ELIMINATE STEERING DRAG WHEN BRAKING. LARGE DIA. TYRES FITTED. 35 X 6 Palmer Cord at 90 lbs/sq.in. pressure. 16.75" Effective radius. Distance of point of contact from centre point = .182". TORQUE TENDING TO STEER THE CAR BY ACTING AT STEERING PIVOT = 11.2 lbs.ft. - decrease of 20% over standard. SMALL DIA. TYRES FITTED. 32 X 4½ Dunlop at 65 lbs/sqin. pressure. 15.187" Effective radius. Distance of point of contact from centre point = .456". TORQUE TENDING TO STEER THE CAR BY ACTING AT THE STEERING PIVOT = 28.2 lbs.ft. - increase of 100% over std. Data taken - Car wt. front axle = 22 cwts. Road co-efficient of friction = .6 One wheel locked. Practical result. | ||