The road trial of an Austro-Daimler car, detailing its specifications, test conditions, and initial observations.
| Identifier | ExFiles\Box 21\7\ Scan032 | |
| Date | 20th October 1925 | |
| R.R. 493a (50 H) (D.D. 31. 12-8-25) J.H.D. EXPERIMENTAL REPORT. Expl. No. REF Hs {Lord Ernest Hives - Chair} /Rm {William Robotham - Chief Engineer} 2/LG231025 ROAD TRIAL - AUSTRO-DAIMLER. (20.10.25) PARTICULARS OF CAR. Bore 71.5 - stroke 110. Displacement 2650. Axle ratio 4.9 - 1. Chassis weight 1.05 tons. Wheelbase 11' 0" - Track 4' 5". 4-seater open touring body. Four wheel brakes - direct pedal operated. Multiple plate dry clutch. 3-bearing Crankshaft. Alum. mono-bloc cyl. casting. Cast iron liners. Detachable cast iron cyl. head. Overhead valves - operated by overhead camshaft driven off flywheel end of crankshaft by helical bevels. Cyl. block integral with top half of crankcase. Steering - worm and nut. Suspension - semi-eliptic front - cantilever rear. Oil circulation - plunger pump. Ignition advance - semi-automatic. Approx. mileage of car (by speedometer) 1,800 miles. CONDITIONS OF TEST. Roads mostly wet - occasionally dry patches encountered - fine - warm. Displacement/ton/wheel rev. (R.R.) 20 HP. 9600 (30.0 cwts.) " " " Austro-Daimler 10,400 (25 cwts.) Without passengers. OBSERVED FEATURES OF THE CHASSIS. ENGINE. Slow running - camshaft and auxiliary drives very quiet. Slight valve clatter noticeable. contd :- | ||
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).