In the years that followed the introduction of “Froment styled” revolving armature engines, various configurations of parts where tried and it was a logical development to place a second electromagnet on the opposite side of the flywheel to gain more power.
Two Engineers, Harry Hawecotte and Henry Klausmann, both from Indianapolis, Indiana, had in 1908, replaced the flywheel with a Rotor that incorporated the armatures. Then they placed a second set of wound stators on the opposite side of the rotor creating a more powerful engine.
Our OMC-5, Series Two, Rotative engine is based, in part, on these designs and by arranging for the rods of the wound stators to be energized at different points of the cycle this engine produces twelve power pulses per rotation.
Working on just 4.5 volts dc. this fully working electromagnetic engine kit is assembled from approximately 180 parts but as no machining or soldering is necessary, this kit provides a satisfying experience for model makers of all abilities.
With the armature discs mounted within the rotor, a can operated switching system ensures that the coil rods are energized as an armature approaches and after passing between them, switches off.
The “break piece” or contact points are mounted in contact housings and operated by the two cams fitted to the common shaft. These housings are fitted to moveable brackets within fixed slides. This adjustable arrangement makes it possible to achieve minimum mechanical resistance at the cams and allows for further fine tuning with the timing plate screws that establish how long the timing blades are in contact. Power is taken off via a pulley.
The model is fitted with a fully working on/off switch of period design that incorporates a spring and ball. This switch makes it possible to easily demonstrate the engine.
Great attention to detail has been taken to ensure that all of the parts are made in the style of the period. The OMC-5 Rotative Engine incorporates an early Rotor which is delightfully Edwardian in design. This is a composite structure made up of over 50 parts and incorporating the six armatures. The A-frame chassis and the authentic terminal connectors are all true to the times.
Produced from high quality brass, silver steel and zinc coated steel with copper windings on magnet steel cores, the model is mounted on a classic hardwood base that also conceals the battery box and other modern considerations such as the diode that prevents sparking at the timing blades. All of the steel parts that are subject to magnetism are constructed from Remco B Magnet steel to prevent the build up of residual magnetism.
A detailed and illustrated instruction manual is provided and the components are packed in numbered packages that correspond to sections in this manual. A Spares Packet of the smallest and most often “lost” components is provided.
The outer packing converts to an assembly jig to support the model while working on the under side.
The kit contains approximately 180 parts that need to be assembled. These parts are supplied in numbered packages that relate to corresponding numbers in the instruction manual.
A very detailed and illustrated instruction manual is provided that also becomes a record of construction.
No machining or soldering is necessary. Only hand tools are required. A BA spanner tool is provided in the kit.
The packing converts to an assembly jig to support the model while working on the underside. This packing box measures 30cm (12in) x 30cm x 5cm (2in) approximately.
The two piece hardwood base is unfinished and will need drilling (template provided). It will also need polishing or varnishing. The base measures 20cm (8in) x 14cm (5,1/2in) approximately.
The finished model stands 10cm (4in) high. The Rotor has a diameter of 6cm (2, 3/8in).
The timing system is adjustable with moving brackets within fixed slides with further fine adjustment possible with the timing plate screws which acts upon one of the timing blades.
The model operates on voltages between 3 and 6 volts dc and is supplied with a battery box that accepts 3 x AA batteries (not supplied).
A Spares Pack of the smaller and most often “mislaid” parts is included.
The Old Model Company Ltd reserves the right to change the specification at any time without notice.