Questions tagged [thrust]

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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 ...
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0answers
19 views

How to decide drone motors?

I'm planning to design a quadcopter with a payload capacity of 5KG. I would need the thrust power from the motors to cater for at-least 7KG (max, worst case) with extra part weights. I would like to ...
-1
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1answer
18 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 ...
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1answer
33 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 ...
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0answers
19 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 ...
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0answers
45 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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0answers
79 views

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 * (...
0
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1answer
85 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 ...
8
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1answer
454 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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2answers
56 views

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 ...
3
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2answers
140 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 ...
2
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1answer
2k 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 ...
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1answer
105 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 ...
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1answer
295 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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2answers
560 views

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 ...
5
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1answer
403 views

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 ...
6
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1answer
84 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?
6
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1answer
1k 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 ...
5
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1answer
252 views

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 ...
4
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3answers
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 ...
7
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2answers
700 views

How efficient are jet engine thrust reversers?

Most reasonably sized commercial aircraft rely on jet engines for propulsion. Upon landing these aircraft use a number of means to come to a stop with the two most important being (I believe) ...