Multicylinder, two-stroke, radial engine for model airplanes and the like

A multicylinder, two-stroke, radial, internal combustion engine, comprising:

• a plurality of cylinders, having respective longitudinal axes evenly spaced apart angularly in a single plane perpendicular to a first rotation axis;
• a plurality of pistons, reciprocating respectively in said cylinders;
• a crank, rotatable about the first rotation axis by a torque applied via a torque input end to deliver an output torque;
• a master connecting rod, having a piston end pivotably connected to a first of said pistons and rigidly connected to a crankdrive element provided with a plurality of crank pins;
• additional connecting rods, each respectively connected pivotably to a corresponding piston at a respective piston end and also connected pivotably to a respective one of the crank pins of the crankdrive element, and
• the master connecting rod being formed to have an aperture to receive the torque receiving end of the crankdrive element to rotate the crank about the first rotation axis,
• whereby sequential power-producing combustion of compressed air/fuel/lubricant charges in said cylinders generates corresponding thrust forces rod to produce said torque,
• said engine further comprising:
• a single shared crankcase, communicating with the intake ports of each of the cylinders to provide a shared common supply of a mixture of air/fuel/lubricant to each of the cylinders;
• a carburetor receiving air, a combustible fuel and a lubricant, the carburetor providing a mixture of air/fuel/lubricant to the single shared crankcase;
• and
• a vane pump, driven by said crank, for receiving the mixture of air/fuel/lubricant from the carburetor at subatmospheric pressure and delivering the mixture to the shared crankcase at about atmospheric pressure, wherein said vane pump includes an arcuate opening on an intake side and an exhaust side thereof.