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).
Performance comparison report between a Goshawk and a Buick vehicle, including hill climb data and engine analysis.
| Identifier | ExFiles\Box 5a\5\ 05-page087 | |
| Date | 1st March 1928 guessed | |
| contd : -2- The figures given for the Goshawk are average figures for a 31 cwts. chassis. BUICK. GOSHAWK. Staunton Hill. Start. 10 m.p.h. 10 m.p.h. Finish. 23.5 m.p.h. 19 m.p.h. Ticknall Hill. Start. 10 m.p.h. 10 m.p.h. Finish. 46 m.p.h. 39 m.p.h. Time. 1 min. 11.8 secs. 1 min. 25 secs. Pistem Hill. Start. 10 m.p.h. 10 m.p.h. Max. speed. 46 m.p.h. 39 m.p.h. Min. speed. 25 m.p.h. 10 m.p.h. Time. 1 min. 34.8 secs. 2 mins. 6 secs. -------------------------------------------------------------------------------- A velocity time curve is attached for the Buick car compared with that of the 20 HP. When comparing the two cars it must be remembered that the Buick has a very much higher displacement/ton/mile figure viz: Buick 8832 - Goshawk 5801. The engine is quite quiet mechanically, the tappet clearance recommended is .008" hot. Engine roaring, similar to that we used to experience on the 20 HP. chassis, is exceptionally bad. This is probably accentuated by the air cleaner. Torque reactions are noticeable, on a par with the Goshawk except at 10-12 m.p.h. where they are worse. At high speeds the engine is smooth; the main crankshaft period occurs at 42 m.p.h. in 2nd. gear (3400 r.p.m.) and is equally as bad as the 20 HP. period. | ||