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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).
Technical specifications and performance test results for an Essex Car.

Identifier  ExFiles\Box 21\6\  Scan011
Date  19th January 1921
  
X4217
(filed 19-1-21)

X.4217. ESSEX CAR.

Weight complete with 4-seater open-touring body - steel pressings - 32 x 4 Kelsey detachable rims - artillery wheels - wood spokes, steel rims - detachable rim carried at rear -

Capacity of engine oil - 1 gall.
" " " end 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. Distance in yds. M.P.H.
at start. 52813 secs. 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 48 ft. 6" 69 ft.
30 112 ft. 149 ft. 6"
40 171 ft. 211 ft. 6"
  
  


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