Questions tagged [aerospace-engineering]
Aerospace engineering is the primary branch of engineering concerned with the research, design, development, construction, and testing of aircraft and spacecraft.
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Assuming sufficient electrical power, is an electrolysed oxyhydrogen rocket practical?
Assume we have access to light electrical power e.g. a (hypothetical) small fusion reactor.
Is it practical to operate a water-fuelled rocket, in which water is converted to hydrogen and oxygen (or ...
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How do I learn about Rockets and planes?
I want to learn how to make aeroplanes and rocket, how they work, etc. I want to be able to make working models. How do I go about it, what books can i read, what videos can I watch for easy, clear ...
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How could predict the affect the of adding another element to alloy in the terms of thermal conductivity and material wear resistance?
I'm interested in the effect thermal conductivity affect and material wear resistance by adding different element to an already high thermal conductivity like GRCop-42.
My main interest are to the ...
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Deriving the longitudinal equations of motion for an aircraft
I'm trying to create a state-space model for the pitch control of an aircraft as described here:
https://ctms.engin.umich.edu/CTMS/index.php?example=AircraftPitch§ion=SystemModeling
The ...
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How does one calculate the aerodynamic pressure on a spacecraft during Max Q?
Just as lift - off of a spacecraft commences, that spacecraft undergoes aerodynamic pressure. After a certain point, the spacecraft reaches Max Q or maximum aerodynamic pressure. I do know that Max Q ...
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Characteristic scales in Thin Shear Layers Equations (Aerodynamics)
I am struggling to understand what characteristic scales mean in the context of thin shear layer equations. I am referring mostly to the following paragraph from the book "Turbulent Shear Layers ...
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High-level sun sensor modelling for satellite
I am searching for some references on how to model at high level a sensor in terms of the statistical interpretation of the errors (bias, noise, ecc). Do someone have any reference (books or papers) ...
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I'm Missing Something on Problem 3 in Section A5.4 of Bruhn's Analysis and Design of Airplane Structures
I've been working through the 1943 edition of Bruhn's Analysis and Design of Airplane Structures. I found an archive.org pdf version of the 1948 edition that includes answers to select problems, as ...
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Is front shroud more thick than the lower shroud used in impellers ? Thickness of shrouds of shrouded impellers used in turbo pumps of rocket engines
This is an impeller used in turbopumps for increasing the pressure of propellants to drive the rocket engines. I wanted to ask all the engineers currently working in manufacturing of these impellers ...
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Why do wing-tip vortices cause an induced angle of attack upstream?
My question is the following. Wing-tip vortices induce a downward flow on the root side of the wing. So, if this induction happens at the wing, and these vortices are then shed downstream, why is ...
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Why do trailing edge flaps increase the CL,max of a wing?
I was wondering why do trailing edge flaps increase the lift co-efficient for a given angle of attack. I am guessing it has something to do with delayed flow separation, but this is quite unintuitive, ...
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CubeSat: When designing the PID Controller of the CubeSat, what are some constraints that you need to take into account?
For a 1U CubeSat project in which we need to design the controller for it.
We decided to not include any propulsion system to keep it light, we'll just essentially drop the satellite on LEO and let it ...
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Wind Load on conical structure
Is there a way to calculate the wind load acting on this conical cylinder?
The wind pressure blowing through the hollow conical cylinder is at 30 bar. The conical cylinder is tilted at 10 degree ...
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How to modify a ball valve to make it cryogenic
I have designed a manual non-cryogenic ball valve in SolidWorks (based on this tutorial: https://www.youtube.com/watch?v=pYsU1gfx-00)
My aim is to modify this CAD design so that it becomes cryogenic (...
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Fuel cell power output
I've spent innumerable time over the years looking for commercially available hydrogen / oxygen fuel cells that might actually be usable in one project concept or another. The best I've ever managed ...
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How would I do stress analysis on a fuselage like this?
This is a frame for an RC plane that I have designed using balsa wood and prefabricated carbon fiber flat bars. It will have a balsa wood skin on the outside, but I have yet to figure out how to ...
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When something undergoes angular acceleration (like a bar) how does the distribution of forces look along the bar?
This is something kind of explained with propellers and turbine blades but I'd love some good explanations. Thank you!
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How does stalled diffuser/wing reduce drag at F1 car?
How stalled diffuser/wing reduce drag at F1 car if in aerodynamics stall/separation is always related to increase in drag?
Any graph of pressure distribution when diffuser is stalled?
From "...
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In orbit rocket launch
If fuel is sent into space in bulk using space station as a "Fuel Depot", then how fast and efficient could in orbit launches of objects like probes, etc be? Rockets use huge amounts of fuel ...
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Helical inserts on aerospace parts work intermittently
I work at a machine shop with high-volume parts and a lot of threaded holes. Common sizes are 1/4-28 STI and 10-32 STI. Every hole gets a helical insert. We have always had major issues with the 1/4-...
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Can we add treadmill-like structures over the airplane surfaces to reduce friction, decrease drag and producing energy?
I am curious about a method to enhance the efficiency of passenger aircraft during cruise speeds by integrating treadmill-like structures on the fuselage and beneath the wings without changing the ...
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Jitter Experienced by Spacecraft from Reaction Wheel Imbalances
I am working on a project trying to model a satellite's pointing error caused by jitter from the reaction wheels. I have found a couple of papers (Paper 1 and Paper 2) which implement the simple model ...
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How to estimate air velocity at turbine in turbojet?
I am designing a small turbojet. I wanted to know how to calculate the air volume expansion to predict the outlet velocity of air towards the turbine. Theoretically, I wouldn't know the flame ...
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Can we use ion thrusters in space to relieve tension on a space elevator cable?
I suspect/hope I'm not kidding myself too much with the physics of this; it seems to stack up in my mind; but can we not relieve tension on, say, a steel cable running from a space station in orbit ...
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Atomic weapon design book [closed]
I’m starting my degree in nuclear engineering in September and was wondering if anyone knew any good books for Atomic Weapon design please?
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Is there a way to 'switch OR engage/disengage' power between two different rotating shafts depending on a set RPM (wind speed)?
I'm a final year mechanical eng student, I'm working on designing a prototype of a 'Hybrid vertical axis wind turbine (VAWT)". This hybrid turbine consists of two types of VAWTs Savonius & ...
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Is there a table for the density, Young's modulus, and other common properties for the most common materials?
I've tried googling extensively, but I have not found a single table that contains many of the "common" materials and more than one property. Does anyone have a table from an engineering ...
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Help relating thrust to angular velocity of helicopter in hover
Given a system consisting of an engine and propeller, I want to determine the maximum thrust it will produce when in stationary hover (no forward velocity) above the ground, and what angular velocity ...
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What is the optimal weight ratio for a multistage water rocket?
I do know about the Tsiolkovsky rocket equation for optimising multistage rockets, however the equation requires a fixed exhaust velocity which is something that water rockets don't have, so for this ...
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Optimizing Launch to LEO
I recently decided I would try to develop my own launch to LEO optimizer, as I have always been fascinated with the complexity of that problem. I have been using matlab, as I am very comfortable with ...
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Improving a poorly designed project. Seed dispersal using a BLDC Turbine
I would like to get ideas on how a project of this sort can be improved.
The Project
A simple sphere of diameter 130mm that is split horizontally by a wall. The wall does not equally divide the sphere,...
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Why did the Mythbuster's dimple car get better fuel economy?
I'm trying to understand why the Mythbuster's dimple car gets better fuel economy - if it actually would as I'm not
I understand that a golf ball functions by creating turbulent air flow and via the ...
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F-1 rocket engine - gas generator data
I’m doing some research on Rocketdyne F-1 engine of Saturn V. In particular I am searching geometric data of the gas generator that feeds the turbo pump. Has someone found this kind of data? It seems ...
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How often is discrete-time control used in industry?
Although in reality I know that computers handle all systems in discrete time, in my limited industry work experience I've only used continuous-time control system analysis/standard frequency domain ...
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How to use a high current 2 Second current pulse to actuate a servo - First year Electrical Engineer
I am using a dual deployment system controller, an Eggtimer Quark REVC2 which at apogee outputs a high current 2 second pulse. I don't have time to buy a more advanced Eggtimer which outputs proper ...
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Does MEMS/Optical Gyroscope record Earth's Rotational and revolutional angular velocities
I am using a 3 axis gyroscope (Android device) to record angular velocities using a sensor data logger application.
When the device is placed stationary, the gyroscope recorded the following values:
...
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Calculating the doppler shift between a satellite receiver and ground station transmitter with python
I'm trying to write a python script calculate the doppler shift that occurs between a satellite receiver and ground station transmitter. Below are the examples that I've been following . What I don't ...
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Location of Reaction wheels in a cubesat
In a pyramid 4 reaction wheel configuration, where would you want to place the reaction wheels. I know that you would want them closer to the center of mass. If you were to place them in a CubeSat for ...
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Investigation of Body Motion in SolidWorks: Euler Angles Rate or Angular Velocity?
This is my first question in this community.
I decided to demonstrate my problem on simple rigid body, but task may be applied to more complex shapes. So, a cube is built in SolidWorks:
Using the ...
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Saturation of penetration length using Lucas-Washburn equation
The Washburn equation for capillary flow provides the following expression for the calculation of the penetration depth (or capillary rise):
$L \propto \sqrt(t)$
My question is when t goes to infinity,...
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How to theoretically determine the flow rate for a fan design?
I am trying to design a ducted axial fan. The fan will be pulling air through a filter, and ejecting out into the atmosphere (For a CO2 direct air capture application). However I want to start with ...
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Why are stress intensity units MPa√m
The units of stress intensity are usually taken as MPa√m. Cracks are usually measured in (mm), could someone please explain why this convention is used an not consistent SI units
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How Does The Aerodynamics Of This Hanging Rotating Wing VAWT Turbine Function?
We are examining videos of this very fast rotating "hanging VAWT" shown on Youtube:
https://youtu.be/O2MZsK0mvBk
https://youtu.be/7hVQ_rVNRUI
It say in the text description that "...
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What is the approximate horsepower/kW output of a cyclist riding a bike at near ~300km/h?
In 2018, a female cyclist set the outdoors record for fastest cycling clocking in at almost 300km/h. (https://en.m.wikipedia.org/wiki/Denise_Mueller-Korenek), and I am curious to know the approximate ...
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How to calculate missile's radius of turn?
I want to make a simple simulator game and in this game there is a missile that must hit something.
The problem is, I can't find the equation to calculate its radius of turn.
The game is a simulator ...
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"minimum gauge problem" or similar concept of a minimum material thickness as you scale down
I recall watching a show about an aeronautical engineering contest to build model-sized aircraft able to lift a set weight to a set altitude with the lightest possible aircraft. The program ...
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How do I make a attitude trajectory of a satellite so the attitude always points towards a point on earth given its current orbital position?
Let us say there is an antenna on earth and I have a satellite in an orbit how do I make the trajectory (not control, so body velocities of the satellite) to make it point toward the earth when it is ...
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Can nuclear bombs intended for mass destruction also be used to deflect asteroids?
As far as I know, there are two possible uses of nuclear bombs: for mass destruction and for deflecting asteroids. For example, Wikipedia describes how nuclear bombs can be used for deflecting ...
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Sensor fusion for IMU
I'm working with MPU-6050 sensor with Raspberry Pi 4. I can read acceleration and gyroscope raw data from the sensor. However I want to get yaw, pitch and roll angles from these data. I tried to ...
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Running a Dynamic Model as Steady State with Time Varying Inputs
I am attempting to run a dynamic model of a waste heat recovery system (Brayton Cycle with intercooling) on IDAES but I keep getting errors on initilization seemingly no matter what I do. My work ...
