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).
Brooklands test data and performance figures for a Humber Super Snipe 27 HP
| Identifier | ExFiles\Box 125\3\ scan0096 | |
| Date | 14th March 1939 | |
| -3- Rm{William Robotham - Chief Engineer}/FD.{Frank Dodd - Bodies}10/JB.14.3.39. Humber Super Snipe 27 H.P. Brooklands tests on 6.3.39. Engine and chassis data. R.A.C.Rating 26.88. No of cyls. 6. Bore = 3.35" = 85 m/m Stroke = 4.72" = 120 m/m Capacity = 249.23" = 4085.7 c.c's. Firing order 1,5,3,6,2,4. Compression ratio 6.13 - 1 Oil pressure - 45/50 lb.sq.in. Tyres. 6.00" x 16". Capacities. Petrol 13 galls. Oil - engine 14 pints. Oil - gearbox 4 pints. Oil - Rear axle 4 pints. Water 30 pints. Battery - 12 x 63 amps. Gearbox. Top - 4.09 Third - 5.99 Second - 10.1 First - 15.13 Reverse - 15.13. Dimensions. Wheelbase - 9' 6". Track - front 4' 7 1/2". - rear 4' 8". Overall length 14' 7". Overall height 5' 5". Overall width 5' 10". Ground clearance - 7 1/2". Weight complete 31 cwts. Turning circle 40' 6". Correct speedometer used. PERFORMANCE ACCELERATION FIGURES. 10 - 30 7.06 secs. 10 - 40 10.75 secs. 10 - 50 16.05 secs. 10 - 60 22.01 secs. 10 - 70 27.8 secs. Lap speed 80.07 m.p.h. 2 min. 4 secs. 1/2 mile speed 80.36 against wind. 80.82 with wind. 1/4 mile. Standing start 21.6 secs. 1/2 mile " " " 39.4 secs. Speedometer check. Clock Actual Error. 30 28.5 1.5 m.p.h. 40 38.3 1.7 m.p.h. 50 47.0 3.0 m.p.h. 60 56.4 3.6 m.p.h. 70 65.5 4.5 m.p.h. | ||