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 and specification report for an Essex Car.
| Identifier | ExFiles\Box 180\M4\M4.1\ img011 | |
| Date | 19th January 1921 | |
| 9.F.C. X.4214 ORIGINAL. (filed 19-1-21) Stamp: RECEIVED JAN EFC 1922 ESSEX CAR. Weight complete with 4-seater open-touring body - steel pressings - 32 x 4 Kelsey detachable rims - artillary wheels - wood spokes, steel rims - detachable rim carried at rear - Capacity of engine oil - 1 gall. " " and radiator water 4 galls 3 pts. " " Petrol tank 10 galls. Front 11 cwts. 1 qr. Rear 13 " 1 " -------------------------------- 1 ton.4 " 2 " = 2744 lbs. -------------------------------- Ratios. Top direct 4.6 to 1 2nd. 8.1 to 1 1st. 14.3 to 1 Reverse. 16.4 to 1 Speed at 1000 R.P.M. top gear 20.9 M.P.H. Consumption on road. 20 M.P.H. 23 M.P.G. 30 M.P.H. 21 M.P.G. Acceleration. M.P.H. at start. Distance in yds. secs. M.P.H. at finish. 10 528.3 34 51 20 " 28 55 30 " 24 57 40 " 22 59 Dynamometer Test. Clutch. Easy to change - very smooth in picking up - no jaggers no slips. Plate clutch with cork insertions running in oil. 4 springs - 1 spring compressed to 2.050" = 74 lbs. 12 ozs. Brakes. No jaggers - Foot brake good side brake good. Distance to pull up with clutch out and brake hard on. M.P.H. Foot brake. hand brake. 20 48ft. 6" 69 ft. 30 112ft. 149 ft. 6" 40 171ft. 311 ft. 6" | ||