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. | ||