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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Airflow visible over the airplane wing

What's that visible airflow over the airplane wing and what causes it?
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Aeroelastic flutter results (NASTRAN) extraction : v-g and v-f plots

for those that have worked on nastran to obtain aeroelastic flutter (sol 145) results with MSC Flightloads: what are the different ways to generate velocity-damping and velocity-frequency plots from ...
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How to design the thickness and diameter of a cantilever beam in bending for both composites and metals?

The goal is to find the optimum values of the diameter and the thickness of the circular cross-section of a cantilevered beam in bending, with the lowest weight (cross-sectional area). The main ...
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Propeller design software & Javaprop help

I'm looking to recreate a 21 inch diameter RC plane propeller for cruising at 30m/s. I have been using javaprop but after inputting the information such as thrust, rpm and hub diameter the blade ...
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Angle of attack on variable pitch propeller?

For a variable pitch propeller where the angle of attack can be adjusted during flight, are the individual blades similar in design to standard propellers, with a low angle of attack at the edge of ...
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3 answers
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Why do air-to-air missiles have tail fins?

That sounds like a stupid question but hear me out. For something like a rocket where the goal is to fly in a straight line the use of the tail fins is obvious. But air-to-air missiles are designed to ...
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Failure criteria for CFRP single plate bolted joint

Which equation can be used to find failure based on ply orientation. Tension,shear & bearing faliure to validate against fem analysis
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1 answer
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What aerodynamic equation should be used to determine the drop in air pressure over an airfoil embedded within a vertical pipe?

I have a conceptual idea for a thruster for a VTOL aircraft/drone which should produce lift by utilizing a upward-flowing airflow to produce low air pressure over the top surface of an airfoil that is ...
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Lift/Drag on sheet metal airfoils

I watched a youtube video about a propeller-driven bicycle and it brought me back to my university days of designing propellers. In college, we used NACA airfoils and used the publically available ...
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How does adding a long fixed pole on top of a drone with a certain mass change the dynamics of a quadcopter?

I have to model a quadcopter with a long rod on top of it so I can later design a control system for the system. I'm a bit lost as to how the dynamics of the system change by adding the rod, can ...
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SMC: Is there a way to control two sliding surfaces with just one control input?

This is a question related to Control Systems. I've been searching papers all over the internet with very little success. I know that traditionally we want one control per sliding surface but If ...
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Are these units correct for Hp/W

using the table provided, and how it says the Velocity should be in mph, is it correct to say that the units of hp/W only taken from this table, using the formula from the table is mph also?
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Where is best place to install vortex generators if race car diffuser stall?

If flow separate in high AoA diffuser, vortex generators can help to delay separation. Where is best palce to install VG for flat floor + diffuser configuration , in front leading edge of diffuser or ...
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Simply supported beam with a truss

i am trying to find out the best way to approach a design task for a plane wing with a truss support. i am treating the wing as a simply supported beam but i have no idea how to incorporate the truss ...
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Is There A Schematic of Hoeltzer's Mischgerät V2/A4 Electronic Guidance Computer?

As a retro computing hobby project, I'm researching Helmut Hoeltzer's (Hölzer's) work on the Mischgerät analog guidance computer for the V2/A4 ballistic missile, with the goal of validating a ...
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How to model a cable for control?

I'm studying a system in space that uses centrifugal force to keep four tip masses extended. The system is defined as follows : a central hub that has rotation freedom in all directions, four tip ...
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What are the practical applications of Centre of Mass & Centre of Gravity?

I have learnt COM and COG are different things if we have non uniform gravitational field i.e. mass will be same at anywhere but gravity will be different. I want to find practical examples of both ...
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3 answers
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Why wind turbine dont use high lift coefficient airfoils?

All wind turibne use low lift coefficent airfoils from 1.0 to 1.5. Why not use high CL airfoils to get maximum torque? http://airfoiltools.com/airfoil/details?airfoil=s812-nr
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How do I find the tracking error when simulating spacecraft motion?

I have been studying Control of Nonlinear Spacecraft Attitude Motion and I would like to solve the following question. I have created the following MATLAB code that works for similar questions, but ...
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Predicting thrust of a Motor

I want to be able to predict the load a single motor and propeller can carry, so I can choose an appropriately sized propeller and powerful enough motor. I say predict because I'm first going to ...
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2 votes
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Is the main goal for wind turbines to take maximum energy for a given diameter?

If you increase the number of blades, that will increase torque, for the same RPM you get more power,...simple logic So why only three blades, is main goal for wind turbine take maximum energy for ...
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Multiple vs single rocket engine nozzles [closed]

I am an aeronautical engineering student and at university with a group of friends we are are working on building a rocket aimed at getting past the Karman Line (boundary to space). We will be ...
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Kelvin's Circulation theorem applied to a cup of tea

Recently, I dipped my spoon into my tea. I saw that as I dipped my spoon into my tea, two vortices formed at both edges of the spoon. I guess this is similar to vortices forming at the end of ...
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For pure rolling , Proof for every point on wheel has velocity = vc + wr

There are 2 texts I have seen for every point on wheels finding out the exact velocity of certain points. The theory states for all is that : Every point on wheel has total v = rotational + ...
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Rigid-flexible multibody dynamic coupling terms

Suppose a multibody consisting a rigid and a flexible parts. When the rotation dynamic of the rigid and flexible part are derived, we see angular acceleration of rigid part, $\ddot{\theta}$ in ...
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Convert from mm of water to Coefficient of pressure (Cp) [closed]

Okay, I have this value in mmH2O (2.650) and am not sure where to go next to convert it to aerodynamic parameter pressure coefficient please? mmH2O * 9.8066 = N/m2 ???? What do do next please? I ...
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3 answers
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Is it practical to separate the fan shaft from the turbine shaft on a jet turbofan engine?

The benefits of this would be a faster exhaust velocity from the fan shaft (since it's not losing energy to the turbine) that would increase thrust, the possibility of using more exotic fuel mixtures, ...
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In an aircraft, should I connect flanges of wing spars' to the fuselage, or webs of wing spars' to the fuselage?

I am actually trying to understand which option is going to be a more relaible for the wing-fuselage attachment. Should I choose a connection between the flanges of the spars within the wing to the ...
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1 answer
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Is 5" between 40" long propellers on an octocopter enough or is a greater distance needed [closed]

These are carbon fiber propellers 40"long at the end of each arm
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How are NASA's mars rovers able to operate with such little energy?

The latest Mars rover being, NASA's Perseverance, uses the Multi-mission radioisotope thermoelectric generator, which has a maximum power output at the beginning of it's operational life of 125 watts, ...
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1 vote
1 answer
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How does my home built drone compare in power/weight to things like race cars or fighter jets?

I fly a home built quadcopter that is 120g all up weight and hovers at less than 15 percent throttle. I believe maximum thrust in the field is likely in excess of 500g. Needless to say this is a very ...
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1 vote
1 answer
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How can I go about learning aerospace/space engineering Pre-College? [closed]

I am 16 years old and have grown a real interest in engineering and just rockets in general, I am unsure of how I can start learning about it though. I am obviously not yet eligible for college but I ...
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2 votes
1 answer
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Difference between pressure suits and anti-g suits

This question might come across as a newbie one but are pressure suits and anti-g suits are two names for the same thing? Google didn't turn up differences between them specifically (if there is any), ...
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Jacobians and Manipulator Dynamics

This is a Stanford Manipulator I started off working on it by initially setting up the DH table Transformation Matrix and then Homogeneous Transformation Matrix I started finding the linear and ...
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Design specifications Venera 13/14 [closed]

I am trying to 3D model the Venera 13 or Venera 14 spacecraft. These are Russian spacecraft from the 1980s. I am looking for design specifications, plans, schematics, or anything else that might make ...
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1 vote
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Stokes Number (characteristic length)

I am working with a high speed flow that is non-stokesian, but that isn't the issue. There are correction factors for that. I am attempting to figure out what value to use for the "characteristic ...
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1 vote
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Will high velocity air directed underneath a half-toroid shaped Coanda saucer by a centrifugal impeller create a lifting force?

I would like to know if a lifting force will be created by the Coanda effect from high velocity air that is directed underneath a half-toroid shaped saucer by a centrifugal impeller. I am seeking an ...
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Why do rockets not fly straight up after launching; wouldn’t that be less atmosphere to traverse?

If you look at any launch it appears as though rockets do not take the shortest path. Their trajectory bends. Why do rockets not fly straight up after launching; wouldn’t that be less atmosphere to ...
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Calculating angle of attack and relative air velocity for 3DoF simulations

I am working with a 3DoF simulator to implement dynamics mentioned in this paper: "Reusable Launchers: Development of a Coupled Flight Mechanics, Guidance, and Control Benchmark" which is ...
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1 vote
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How to properly use the lift-curve slope for divergence calculations?

I was reading Wright and Cooper's writings on static aeroelasticity and I think I'm missing something. To calculate the acting lift, the equation $L = q S a_1 \theta_0$ is used, where $q$ is the ...
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2 votes
2 answers
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What can I coat on Stainless sheet (316 L) plate to achieve high thermal reflectivity?

I was thinking of using some Aluminum coating/blanket but the temperatures can reach 550C+ in the Chamber I work at. I am concerned about melting. Let me know. P.S: I am an entry level Engineer. ...
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How to find old (especially Soviet/Russian) blueprints

I am interested in old blueprints, especially if related to aerospace (and from the old Soviet Bloc), things like these: Vostok blueprints Soyuz blueprint. Does anybody know if there is any methods to ...
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2 votes
2 answers
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How to convert the velocity field to a pressure field for obtaining the sound level?

I am studying jet mixing noise and I am given a velocity field, with $V_x$, $V_y$, $V_z$ in the Cartesian coordinates. I wanted to know if there is a method by which I could find some information ...
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1 vote
3 answers
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Why does the upper wing skin fail in buckling and lower wing skin does not?

I am aware of the fact that the buckling is mainly caused in the regions of the specimen which are in compression. But the wing skin doesn't take any axial loads and is used to resist shear, atleast ...
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4 answers
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Is it okay to replace pressure with point loads for structural analysis?

I am trying to analyse a wing structure in Ansys static structural. In most examples I have been through the lifting pressure is uniformly applied under the bottom of wing or it is simplified to point ...
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Why don't we use feather like structures for hang gliding?

I'm not entirely sure if this is the right site for this question, but I recently went on a Greek Myth Binge and came across Daedalus again, and his famous first hanglider, made from feathers. Now, ...
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How to calculate the heading of an aircraft given coordinates from the ground

I'm trying to figure out how to calculate the heading and flight path of an aircraft when it's measured from the ground. I literally have no idea where to start. The coordinates from the ground are (-...
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Can we collide two Nano Spacecraft moving at 20% speed of light?

Nano spacecrafts are gram level silicon chips that will be accelerated to 20% of the speed of light to reach Alpha Centauri in 20 years. I wonder if we can break the weight limitation by shooting ...
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1 answer
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Calculating Gearing Ratio from Constrained Rotational Linear Arc and Horizontally Opposed Rotation

I'm 3D printing an aircraft throttle unit as a POC and am trying to calculate the gearing ratios that are required in order transfer the full range of linear motion into a directionally opposed sensor ...
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How to dodge homing missile?

There is a missile guidance algorithm called proportional navigation. Is there an opposite algorithm for missile avoidance? Something that tries something other than escaping in the direction of a ...
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