How the thrust is created for flying: Jet Aircraft Propulsion Aeronautical Engineering Notes | EduRev

Aeronautical Engineering : How the thrust is created for flying: Jet Aircraft Propulsion Aeronautical Engineering Notes | EduRev

 Page 1


1
Lect - 2
Page 2


1
Lect - 2
2
Prof. Bhaskar Roy, Prof. A M Pradeep, Department of Aerospace, IIT Bombay
Lect-2
How the thrust is created 
for flying
Page 3


1
Lect - 2
2
Prof. Bhaskar Roy, Prof. A M Pradeep, Department of Aerospace, IIT Bombay
Lect-2
How the thrust is created 
for flying
3
Prof. Bhaskar Roy, Prof. A M Pradeep, Department of Aerospace, IIT Bombay
Lect-2
• An aircraft does not fly simply by setting it out 
on the runway and allow strong wind to blow 
over its wings. 
• The aircraft is to be moved forward, forcing it 
to run through still air at a high speed. Only 
then necessary lift is created for it to fly. This is 
a continuous requirement.
• This forward thrust for the aircraft comes from 
one of two sources: i) a rotating propeller blade 
powered by an engine or,  ii) a pure Jet engine.
Thrust for flying
Page 4


1
Lect - 2
2
Prof. Bhaskar Roy, Prof. A M Pradeep, Department of Aerospace, IIT Bombay
Lect-2
How the thrust is created 
for flying
3
Prof. Bhaskar Roy, Prof. A M Pradeep, Department of Aerospace, IIT Bombay
Lect-2
• An aircraft does not fly simply by setting it out 
on the runway and allow strong wind to blow 
over its wings. 
• The aircraft is to be moved forward, forcing it 
to run through still air at a high speed. Only 
then necessary lift is created for it to fly. This is 
a continuous requirement.
• This forward thrust for the aircraft comes from 
one of two sources: i) a rotating propeller blade 
powered by an engine or,  ii) a pure Jet engine.
Thrust for flying
4
Prof. Bhaskar Roy, Prof. A M Pradeep, Department of Aerospace, IIT Bombay
Lect-2
Thrust requirement for aircraft 
Drag
Lift
Weight
Lift  = Weight
Drag = Thrust
For an aircraft to fly
For  level  flight
Page 5


1
Lect - 2
2
Prof. Bhaskar Roy, Prof. A M Pradeep, Department of Aerospace, IIT Bombay
Lect-2
How the thrust is created 
for flying
3
Prof. Bhaskar Roy, Prof. A M Pradeep, Department of Aerospace, IIT Bombay
Lect-2
• An aircraft does not fly simply by setting it out 
on the runway and allow strong wind to blow 
over its wings. 
• The aircraft is to be moved forward, forcing it 
to run through still air at a high speed. Only 
then necessary lift is created for it to fly. This is 
a continuous requirement.
• This forward thrust for the aircraft comes from 
one of two sources: i) a rotating propeller blade 
powered by an engine or,  ii) a pure Jet engine.
Thrust for flying
4
Prof. Bhaskar Roy, Prof. A M Pradeep, Department of Aerospace, IIT Bombay
Lect-2
Thrust requirement for aircraft 
Drag
Lift
Weight
Lift  = Weight
Drag = Thrust
For an aircraft to fly
For  level  flight
Prof. Bhaskar Roy, Prof. A M Pradeep, Department of Aerospace, IIT Bombay
Lect-2
Differential form of thrust generation,
Thrust based on acceleration of mass
Thrust based on velocity change 
in a time period
Acceleration, Velocity, Momentum and Force are vector 
quantities. They all have specific magnitude & direction
55
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