# Tag Info

### When a jet engine propels an aircraft forward, where does the thrust force on aircraft act?

I think the thrust is generally applied as show on the top part of the following image. If you are trying to apply the force on the mount, then the same force is applied, however you need to add a ...
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### When a jet engine propels an aircraft forward, where does the thrust force on aircraft act?

The thrust force acts on the axle bearings that support the compressor stage shaft of the turbine. That reaction force is conveyed out to the engine mounts which are in turn bolted to the airframe.
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### Thrust generated by a ship

This gives a complete analysis of how to calculate : http://web.mit.edu/13.012/www/handouts/propellers_reading.pdf
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### Propeller design

Just think of the propeller as a mean to thrust air in one direction. The higher the angle of incidence, the more the propeller is pushing the air (up to about 45°, then the force perpendicular to the ...
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Accepted

### Compressing the air thrusted by an aircraft's propeller through a cone like tube

It would be slower. Compressing the air takes energy - that will slow the propeller, and the plane as a whole. Imagine a water pump, which is pumping water out of a pipe. Now, if you put your finger ...
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### Heating the air inside a turbojet instead of combusting it

As a reference, consider the Meredith effect, which applies (applied) in the construction of the P-51 Mustang radiator. From the linked Wiki site: The Meredith effect occurs when air flowing ...
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### What is the relationship between the type of material(ex: steel, iron etc.), thrust and torque?

Usually what happens when you are trying to determine parameters about drilling, lathing or milling a material you need to consider the following parameters: material that is being removed material ...
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### Please explain engine thrust and aircraft weight

Unless an aircraft takes off vertically the thrust it needs is much less than its weight, roughly proportional to the sin of take-off angle. Or sometimes a plane can fly with zero trusts. such as on ...
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### Does air pressure difference of intake exhaust contribute to jet thrust?

The easiest way to view the problem is to draw a control volume around the engine that is big enough so that the air pressure is constant on the boundary surface of the control volume and the upstream ...
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### RC drone rotor air access

In the 50's the DARPA designed such a craft but due to aerodynamic instability it was a complete failure and abandoned. The problem you have is maintaining 4 separate intakes which have a greater ...
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### How does 2nd gear create more thrust than 1st gear?

I think that you've totally missed the limiting factor - maximum engine speed. The 1st gear has a maximum velocity value after which you can’t accelerate more. No, it's the engine RPM is limited. ...
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1 vote

### How does 2nd gear create more thrust than 1st gear?

The torque an engine can produce depends on the RPM of the engine. The torque it can produce actually decreases after a certain point. See e.g. the graphs on the bottom of this page: While ...
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### When a jet engine propels an aircraft forward, where does the thrust force on aircraft act?

At the start-up of the motion of the airplane the thrust mostly goes to overcome the static and then dynamic friction of tires so we need to consider the moment with respect to the distance of the ...
• 22.6k
1 vote

### What is the relationship between the type of material(ex: steel, iron etc.), thrust and torque?

What you are interested boils down to the "specific cutting force" ($N/mm^2$) parameter - which varies by material. Not just steel or aluminum - but what alloy (e.g. addition of lead acts ...
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### Thrust distribution of engine

In your force/momentum balance equations you always can include the pressure of the gas. The only time you can ignore it, is if the difference in $PA$ is small compared to other forces. For example ...
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### Heating the air inside a turbojet instead of combusting it

the amount of energy per second you would have to dump into the air passing through the "heating chamber" in order to make the turboprop engine work would have to be at least as great as that produced ...
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1 vote

### Compressing the air thrusted by an aircraft's propeller through a cone like tube

This is done in a jet engine, and partly, by the cowl around the front fan on a jet airliner engine, but on a large propeller, you could only do it slightly without slowing the airflow through the ...
1 vote
Accepted

### How to calculate thrust from mass flowrate and velocity

Well the best learning happens when there is a need, and the internet can answer almost any question. Easiest way to understand physics is to use SI derived units and always carry your units through ...
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### Calculating Thrust for Contra-Rotating Propellers

This is one analysis that gives you information . Source : http://naca.central.cranfield.ac.uk/reports/arc/rm/2218.pdf
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1 vote
Accepted

### Thrust generated by a ship

If you know the Froude efficiency $\eta_{\text{Fr}}$ and assume a constant velocity $u$ for the ship. Then you can calculate the thrust $F_{\text{T}}$ for given power at the shaft $P_{\text{S}}$ as ...
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### What is the equivalent moment of inertia of a two-pivot pendulum?

You have two moments which means you need to find the neutral axis which usually coincides with the system centroid along $I_{xx}$. The difficulty is overcome by applying simple rules of statics and ...
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