An opposed-piston engine is a reciprocating internal combustion engine in which each cylinder has a piston at both ends, and no cylinder head.Whereas the radial engine is a reciprocating type internal combustion engine configuration in which the cylinders point outward from a central crankshaft like the spokes on a wheel.
arm
ring distribution is round
Yes it is. They use deep groove bearings in most radial engines. These types best for reducing friction while carrying both thrust and radial loads
Yes, turbines used today are radial steam engines.
Radial tires came about in the '70's, and have an interior tube, as opposed to the older tires, which were solid rubber.
too much torque and not efficient enough
There were basically two types of aircraft engines, in-line and radial. In-line engines were like most car engines. You start with a solid block of metal and bore large holes in it for the pistons, one hole behind the other, all in a row. Normally these had to be water-cooled, adding an extra vulnerability to the airplane. A bullet through the radiator would soon cause all the coolant to leak out and soon the engine would seize up from overheating. Radial engines have the cylinders bolted on around the outside, like spokes on a wheel. They radiate from the middle, hence radial. Radial engines are roughly round, and wide when compared to an inline engine, but short, front to back. Because the cylinders are outside, all around the edge, not in the middle of a cylinder block, radial engines can be air-cooled. Think of the nose of a US P-47 - its blunt and wide because of its large radial engine housed there. The US P-51 had an in-line engine, and a pointy nose. The same with Germany's Bf 109 - pointy, inline, and the FW 190, blunt, wide, radial.
V, inline, horizontally opposed, and radial.
Pairwise differences in radial diameters at angles around perimeter.
2 wings, to determine which engine was used need to know what biplane
There were two types of airplane engines in WWII - radial, and in-line. Both had cylinders within which pistons traveled back and forth, powered by the exploding fuel. Radial engines were round, and very short front to back. The cylinders were bolted on all around the outside edge. These engines were air-cooled. Fighter planes with radial engines had a flat, blunt nose, like the US P-47 or the German FW 190. A radial engine could have a gun mounted to fire through the middle of the propeller hub. In-line engines were water cooled. That meant they needed a radiator just like a car.
An axial compressor uses many stages of "fans" with stators to compress air in the same direction as its original flow. An example of this is that of *most* turbojet engines' compressors. A radial (or centrifugal) compressor works at right angles to the airflow's original direction. An example of a radial compressor is the compressor on an automotive turbocharger.