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(Aero Engine)(Codename for 20HP Car / Aero Engine after Kestrel(Aero Engine)) are average figures for a 31 cwts. chassis. BUICK. GOSHAWK(Aero Engine)(Codename for 20HP Car / Aero Engine after Kestrel(Aero Engine)). 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(Aero Engine)(Codename for 20HP Car / Aero Engine after Kestrel(Aero Engine)) 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(Aero Engine)(Codename for 20HP Car / Aero Engine after Kestrel(Aero Engine)) 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. | ||
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).