Project-1: Powertrain for aircraft in runways

Ground Speed	Air speed
Ground speed is the airplane’s speed relative to the surface of the Earth	Airspeed is the speed relative to the air it is flying in.
Ground speed is what determines how fast an aircraft will get to its destination	Airspeed is what determines whether there is enough airflow around an aircraft to make it fly
Ground speed is simply the sum of airspeed and wind speed.	It is independent of ground speed.

Q3).Why is it not recommended to use aircraft engine power to move it on the ground at Airport?

Towing is coupling two or more objects together so that they may be pulled by a designated power source or sources. The towing source may be a motorized land vehicle, vessel, animal, or human, and the load being anything that can be pulled

Although many aircraft are capable of moving themselves backwards on the ground using reverse thrust (a procedure referred to as a powerback), the resulting jet prop might cause damage to the terminal building or equipment. Engines close to the ground may also blow sand and debris forward and then suck them into the engine, causing damage to the engine. A pushback is therefore the preferred method to move the aircraft away from the gate.

Although most aircraft are capable of moving themselves backwards on the ground using reverse thrust, a procedure called as a powerback, it is not typically done due to the following reasons:

The jet blast from the engines can damage the terminal building and nearby equipment. It can even throw away people standing nearby.

Engines can blow sand and debris.

Engines can suck in sand and debris which can cause serious damage to the engine.

It is easier for the truck driver to see the surroundings better than the pilot sitting in the cockpit with limited windows.

The pushback truck driver knows the airport better than the pilot.

The plane engines are very loud. This noise can add up substantially when multiple planes are moving around the airport. It won't be a pleasant experience for people sitting inside the terminal, as most people don't even like the sound of powerful motor-bikes.

It saves fuel. Virgin Atlantic had proposed a new system in which the pushback trucks will push the plane all the way to the runway to save fuel and reduce impact on nearby environment.