# Questions tagged [thrust]

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### At what location in a ducted centrifugal fan, the discharge of which is turned from radial to axial via the duct, is the force of thrust applied?

I am optimizing the structure of the duct for weight savings and need to know where the force of thrust (load) will be located. Assume the inlet is at the top, the fan axis of rotation is vertical. ...
109 views

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

I am trying to model the mount structure of an aircraft onto which a jet engine is attached, in Finite Element Analysis. Since I am only concerned about the local mount structure, I have isolated it ...
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1 vote
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### Which of these propeller configurations is most efficient?

All propellers shown in the figure above are identical and are operated at identical speeds with four separate (numbered 1 through 4 vertically) configurations illustrated. The physical distance ...
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1 vote
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### What is the relationship between the type of material(ex: steel, iron etc.), thrust and torque?

If I am drilling through bars of different material(ex: iron, steel etc.) of the same thickness and under the same conditions of drill operations(feed rate and rpm), how will the torque and thrust ...
• 13
63 views

### Please explain engine thrust and aircraft weight

This is probably really easy for someone... But... My non-engineer head just cant seem to get an answer to this question in terms that are simple to digest. A new Boeing 777X has a max take off weight ...
72 views

### Why inner radius of housing washer and shaft washer is different in thrust bearing?

Why inner radius of the housing washer and shaft washer is different in thrust bearing? I checked on SKF's website dimensions of a thrust bearing. The inner radius of the housing washer is different ...
1 vote
89 views

### Does air pressure difference of intake exhaust contribute to jet thrust?

I know momentum of the airflow inside jet engine generates thrust, but what about the pressure difference in front of and at the back of the engine? The air sucking intake at the front has lower than ...
26 views

### How to calculate the force required to move this water bot with certain speed

This is my project where I have created a river cleaning machine. It works fine but no actual calculations have been done regarding the power requirement of motors(A software engineer ). The machine ...
67 views

### Determining thrust equations for a custom UAV

I have been tasked to mathematically model and simulate a 2 propeller, 2 motor UAV. But I am struggling with determining the thrust equations, of the propeller, for my design. I know that: Ft = Ct * ...
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1 vote
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### Am I estimating thrust of a ducted fan correctly?

I'm asking if I'm doing this correctly. I've estimated the thrust of a ducted-fan model aircraft neglecting pressure changes across the duct as follows: $$F = Q * \rho * (V_e - V_0)$$ = Q * rho * (...
108 views

### RC drone rotor air access

I am attempting to design a "flying saucer." The saucer is an ellipsoidal-ish body with a RC drone inside. I plan to allow for air access to the rotors as shown in the rudimentary diagram below: I am ...
687 views

### Thrust distribution of engine

I am studying the thrust distribution of jet engines. But I'm now a bit confused. In Rolls-Royce's "The Jet Engine" book, http://aeromodelbasic.blogspot.com/2012/05/thrust-distribution-distribution-...
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### Heating the air inside a turbojet instead of combusting it

Would an aircraft that uses propellers for movement but with a turbo jet like structure where the ignition chamber only heats the air a bit, similar to a hair dryer instead of releasing fuel and ...
279 views

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

If I had an aircraft that used propellers for movement and took the air from the front running it through a tube that gets very small towards the end, would it have any impact on the speed? Would the ...
3k views

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

How can I calculate thrust in Newton from mass flowrate and velocity? Please note,I have mathematical skills of 7 year old,the most complex task I can do is multiply and divide,I dont understand ...
148 views

### Propeller design

I see on internet, that aircraft propellers most effective blades angle only 15 degrees on every blade. Why propellers not use 45 degrees angle on propeller's blade that give more thrust on the ...
378 views

### Calculating Thrust for Contra-Rotating Propellers

How do I calculate the thrust of ducted contrarotating propellers? Is there any formula or website calculator or would it have to be done through experimenting with scale replicas?
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### Thrust generated by a ship

While reading about airplane engines on the internet, it is common to find figures of their thrust, in kilo Newton. However, in the case of ships and naval vessels, when talking about the engine, the ...
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### What is the equivalent moment of inertia of a two-pivot pendulum?

I am working on a system that consists of a hanging-pendulum thrust balance with two pivot points, one in the front and one in the back There is a heavy weight applied in the front. I can change the ...
106 views

### Thrust consideration in sprinkler and irrigation systems

In commercial fire sprinkler systems or large farm irrigation systems, is the thrust produced by the water a major design consideration? At what stage in the design process is this taken into account?
2k views

### What is the equation to calculate the Thrust coefficient within a set of parameters?

In the book, Design of Liquid-Propellant Rocket Engines, there is a practice problem written as such. "Determine the design values of $(C_*), (C_f), and (I_s)_t$ for the engine thrust chambers of ...
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### PWM flow control and thrust

If I have a water pump and a fast solenoid valve (can be open or closed) and turn on my pump at a constant voltage and apply pulse width modulation to my valve. Would the resulting thrust created at ...
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3k views

### Maximal thrust from water pump

For a small water pump like this one here, how can I roughly estimate how much thrust it would deliver considering the maximal pressure (PSI) and the flow rate (L/min). As a nozzle let's assume it is ...
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