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).
Specification sheet comparing alleged and actual vehicle performance data alongside component details.
| Identifier | ExFiles\Box 127\5\ scan0071 | |
| Date | 7th October 1940 | |
| -3- Rm{William Robotham - Chief Engineer}/Wym.{G. Harold Whyman - Experimental Manager}1/SW.7.10.40. Petrol consumption alleged. 20 MPH Not given. Actual 20 MPH 49.9 MPG. 30 MPH 52 MPG 30 MPH 48.6 MPG. 40 MPH 45 MPG 40 MPH 44.2 MPG. 50 MPH 36 MPG 50 MPH 39.3 MPG. Average on long run alleged. 45 MPG Actual. Over 300 Mls. 33.8 MPG. Gearbox 3 speed. Reverse - 23.08 1st gear - 18.75 2nd gear - 8.63 Top gear - 5.14 Engine speeds at 10 MPH. Reverse - 3192 RPM 1st gear - 2592 " 2nd gear - 1192 " Top gear - 710 " Prop: shaft, Hardy spicer (needle roller bearings). Rear Axle - semi-floating type - 80 ton alloy steel casing pressed steel. Final drive spiral bevel gears - 75 ton case hardened alloy steel. Differential - two bevel pinions. Brake, Bendix, Due-Servo. Hand or foot to all wheels by enclosed cables. Steel brake drums FRONT 1¼" x 8" REAR 1½" x 6" Suspension. Independent FRONT 36½" x 2¼" REAR 39" x 1½" Tyres E.L.P. 4.75 x 16. Shock absorbers piston type. Steering - Burman-Douglas worm and nut. Wheel dia. 16½". (continued) | ||