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 data for an Essex Car.
| Identifier | Morton\M4.1\ img011 | |
| Date | 19th January 1922 | |
| 9.F.C. X421Y ORIGINAL. (filed 19-1-22) 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 glls. 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. 18.4 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 | - | 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" STAMP: RECEIVED JAN E F G 1922 | ||