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Join the discussion of general engineering topics. The design, building, and use of engines, machines, and structures. Use the forum for any engineering topics not applicable to the specific categories.
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Sources of Information on Engineering
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Insights Why We Don’t Discuss Perpetual Motion Machines (PMM)
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YOU: Fix the US Energy Crisis
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Insights How Does an Airplane Wing Work: a Primer on Lift - Comments
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Why are MRI machines so expensive to operate?
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Washing machine - centripetal force
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22
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286
Total torque of a multi motor system
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12
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320
Are electric cars over engineered?
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7
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192
What does Damage Equivalent Load (DEL) mean?
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1
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278
Impact force reduction after passing through a medium
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4
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213
Dehumidifier and open window
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Applying pressure for clearing land mines
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Estimating efficiency of a system
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26
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455
Fluid dynamics problem: Equalize the volume of water in tanks at differing heights
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Does a pump face less back pressure if a vertical pipe is wider?
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378
Hydraulic Motor & Constant Torque
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For fun: How big of a Microscope is needed to see a Planck Length?
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18
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463
Flicker emission limits
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3
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254
DIY electrowetting on a hydrophilic surface
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0
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197
Wrapping a Ribbon Around a Cone
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Why is Diode reverse saturation current I_s still in the V-I equation when when a diode is forward biased?
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2
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263
Gas conductance through tube at low pressure
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Does anyone know how this motor from Quantum Energy works?
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308
Improve Result of my CFD results
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236
How to calculate if wind through a funnel can open a check valve?
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20
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436
Searching for fully sintered boron nitride ceramic
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1
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378
I have a few questions about refrigeration and AC units
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1
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363
An engineer's approach to the quadratic formula
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3
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593
Decompressing through an underwater horn shaped tunnel
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6
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501
Determine Force for inclining platform
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8
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529
Optimization of barrel length in pneumatic cannons
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23
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795
Minimizing Raw Material Losses at Float Glass Manufacturing Facility
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5
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536
Selling Older 3D Printer: Tips & Advice
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407
Automatic Window Opener - how does it work?
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6
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994
Body-Fixed Reference Frame -- How is it useful?
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5
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Borrowed a used Freddy Vacuum Cleaner for my CNC -- Need help with something!
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2
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675
Measuring the Speed of Sound in Water, Using Faraday's Law
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803
Enclosure Panel Material and Heat Transfer
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9
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662
Cooling Water in Hard Soil: Data and Questions
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7
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836
Wavelength / signal which would pass through concrete and rubble
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7
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610
COMSOL: Simulation of liquid nitrogen cooling (Help please)
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2
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738
Small-scale hydropower generators installed in irrigation canals
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4
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676
Bursting strength and compressive strength of cardboard tubes
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3
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744
Hydrostatic pressure in a narrow container
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How to include an ITO layer for Anti-Reflection Coating in Silvaco?
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1
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716
Downdraft table -blocking off part of table surface to increase flow?
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10
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866
Tiny wind turbine alternator
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28
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Help to calculate rotation speed of rotor
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7
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716
Stainless steel as ferromagnetic or non/paramagnetic
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3
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716
NS Derailment, East Palestine, Ohio - 3 Feb, 2023 - Engineering Aspect
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9
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Measuring thermal conductivity of a metal
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3
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675
Optics for High Resolution Laser Imaging: Finding the Best Path
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7
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839
Should a central heating boiler be kept on all the time or on a timer?
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6
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806
Solve angle issues for opening a door with a linear actuator
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21
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4K
Increasing the Range of Howitzers
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Low Heat/Thermal Conductivity Electric Conductive Materials
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4
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796
Amtrak derailment, Sept. 25, 2021, near Joplin, Montana, US
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1
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628
Hydrocyclones- Calculation steps and separation results
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2
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864
Flooding and Stream area and speed
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11
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825
Converting Effective Mechanical Load to Newtons (Capybara)
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5
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824
As much steam as possible from engine exhaust gas + warm water?
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25
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Heat loss from the temperature difference
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Possible to create laminar flow in fast moving air?
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4
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896
Using a Jar for vacuum storage
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Acrylic (PMMA) rotating disc tensile strength calculation
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4
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818
Hydrogen-fueled Internal Combustion Engine (ICE)
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11
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1K
Appropriate tightness of bolts between skateboard and trucks
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Surely this will NOT work: violation of conservation of momentum?
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2
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Modern US locomotive design and operation
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The 41 second clock failure syndrome
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Shower Mixer Taps: Physics & Maths Explained
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Help with wheels, stopping forces and possibly Simpack
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24
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Hovering cars vs wheeled cars
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How do Engineers Calculate the Dimensions of their Design Ideas?
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What's wrong with this math: A lot of thrust and almost no fuel?
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3
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Pneumatic Interlock(?) Switch
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Finding the Equivalence Ratio of Combustion (Methane + Air)
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How to find velocity of gas pump flowing into car tank
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1K
Calculating the force that a permanent magnet exerts on a particle
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Calculating total heat transfer by solar water heater
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Looking for basic theory on mixing of gases
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4
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Highest useful Fahrenheit temperature?
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Tilting a 55 Gal Plastic Drum: Calculating Force Needed
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Problem Connecting Core with Face Plates (APDL)
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Could steam cars be possible in the 2020s?
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What lazy engineers achieve: A Rubiks cube that solves itself
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How to model the behavior of a closed loop position system?
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How to calculate the leak rate based on pressure drop
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Unsolved Engineering Problem: Runaway Anchor Drops
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Geo-engineering lake Meade
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Can I move a macro object at a very small distance (around 10 nm)?
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What Really Happened at Arecibo
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Why Was the DCSS/ICPS Designed This Way (launch vehicle)?
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Getting an exact amount of Methane out of a cylinder
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Why are only two senses transmittable via technology?
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Current state of Moore's Law?
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Using compressed air through a venturi pump to suck oil?
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5
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Can every symmetric matrix be a matrix of inertia?
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Question regarding water pressure and slopes
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How can I get rid of air buildup in a siphon system?
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How best to heat my house?
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Intro text on building a small fluid pressure chamber?
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18
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Heat Transfer Through a Two Material System due to a Light Source
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"Holographic" Display with Rotating Blades
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15
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