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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).
Specifications and dynamometer test results for the Owen Magnetic Car.

Identifier  WestWitteringFiles\D\February1920\  Scan31
Date  6th February 1920
  
To R.{Sir Henry Royce} from hs.{Lord Ernest Hives - Chair}
c. to CJ
c. to H.{Arthur M. Hanbury - Head Complaints}
c. to R.{Sir Henry Royce}
c. to Da.{Bernard Day - Chassis Design}
c. to EY.
c. to EP.{G. Eric Platford - Chief Quality Engineer}

C.K. ORIGINAL

x.3636 OWEN MAGNETIC CAR.

Particulars of Car.

Engine 6-cylinder 3.75" bore 5.5" stroke.
D headed engine. 6-cylinder mono-bloc.
Compression ratio - 4.1. to 1.
Compression by gauge - 65 lbs.
Zenith Carburetters. 22 mm throat.
Aluminium Induction Manifolds.
Ignition - Bosch magneto only.
Weight of car - front 19 cwts. 2 lbs.
rear 1 ton 3 cwt. 1 lb.
2 " 2 " 3 " total.

Chassis fitted with 5-seater open touring body hood and windscreen.
Rear axle ratio 3.5 to 1.
Axle control - torque rod.
Dia. of road wheels - 35 x 5.
Transmission - Entz Electrical Transmission - (see report APC/T4.9.19).
Dia. of Motor Armature 8.5" - length 7.5" approx.
Dia. of Generator " 8.5" - length 9.5" approx.
Motor Commutator 6.5" dia.
Generator " 5.5" dia.
Slip rings 4.75" dia.

Test.

DYNAMOMETER TESTS.

Engine revs. | Dyn. drums. | HP.
---------------------------------
500 | 420 | 14.4
750 | 628 | 19.3
1000 | 840 | 25.2
1250 | 1048 | 29.1
1500 | 1260 | 29.7
1750 | 1468 | 26.4
2000 | 1680 | 26.4

During the dynamometer tests we counted the speed of the engine and of the dynamometer drums simultaneously. It

Contd.
  
  


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