What is the purpose of an engine?

Types of aircraft engines and why we need it, at all times?

The engine in an aircraft, is like the heart in our body. The main purpose of the engine is to produce power through torque generated by the blades connected to it, to push the aircraft forward and into the air. 

Aircraft Engines are divided into two types: piston engine (4 stroke engine) and jet engine (continues flame engine). Both types of engines work on fuel. Piston engine use Avgas (aviation gasoline) grade 100 octane, while jet engines use jet fuel called Kerosene.

How piston engines generate thrust?

The piston engine. ( we will not discuss the jet engine)Many aircraft make use of propellers, which slice through air to create thrust. Within air mass, airplane propellers move in a motion that is similar to a corkscrew, what is called a helical motion.

The internal combustion process in the piston engine of aircraft generates power and develops force. In simpler words, the airplane engine provides the propeller with power; the propeller uses this power to create thrust.

To generate thrust, airplane propellers must rotate. Power delivered from the engine helps in achieving this rotation. The engine, a crankshaft, and the propeller, make up the whole thrust-generating assembly. 

Thrust is essential to move the airplane into the air at all times, so thrust opposes drag and moves the airplane forward into the air to generate lift from the wings.