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Radial Engine main internal components
(split crank shaft, crank-pin bearing and disk, piston-cylinder, sliders, electronic valve actuators)

The engine is a radial engine with five piston-cylinders extending radially from the center using an internal disk and slider configuration. The particular model selected for the BEAVER project is rated at 800 cc, 44 kW @ 5000 rpm, (60 HP) mainly because of the requirement of lightweight, power density, efficiency, simplicity and balancing. A 42 Volt starter-alternator system is used to power the Electromagnetic Valve Actuator (with 5 valves per cylinder). The engine is air/oil cooled.
The engine is analogous to old aircraft piston engines. However the slider and disk configuration replaces the master connecting rod and slaves of the older generation of radial engines. The result is a vibration-free lightweight engine specifically adapted for the BEAVER project. Its relative lightweight results from the minimal block mass required because of the negligible inertia forces acting on the block. The engine is to be placed horizontally, flat, centrally of the chassis at the level of the double-clad floor. The axis of the driving shaft is vertical and communicates with the CVPST all within the space defined by the central bulkheads. The forward air intakes communicate cooling air to the engine through the passages formed in the double-clad floor.

Click on the picture for engine animation

 

Key Benefits

  • Simplicity and therefore low fabrication cost, modularity,
  • Low weight (high power density),
  • Perfect balancing of all inertia forces (primary and any higher order), low noise level,
  • Low BSFC due to better mechanical efficiency.