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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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Low-Cost Object Detection System Using ESP32-CAM – Approach, Challenges
1K threads
Electronics Low-Cost Object Detection System Using ESP32-CAM – Approach, Challenges
Measuring the Speed of Sound in Water, Using Faraday's Law
  • KTBMedia
  • · Replies 14 ·
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14
Hydrostatic pressure in a narrow container
  • RFreund
  • · Replies 16 ·
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16
Downdraft table -blocking off part of table surface to increase flow?
  • Cringle
  • · Replies 10 ·
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10
We Bought a House (A materials question)
  • DaveC426913
  • · Replies 8 ·
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8
Why haven’t we made blow up wings to fly with them
  • kingsbishop
  • · Replies 27 ·
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27
NS Derailment, East Palestine, Ohio - 3 Feb, 2023 - Engineering Aspect
  • Astronuc
  • · Replies 9 ·
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9
Optics for High Resolution Laser Imaging: Finding the Best Path
  • Mike Gaffer
  • · Replies 7 ·
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7
Amtrak derailment, Sept. 25, 2021, near Joplin, Montana, US
  • Astronuc
  • · Replies 1 ·
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1
Flooding and Stream area and speed
  • fog37
  • · Replies 11 ·
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11
Can a Mason Jar Maintain a Vacuum for Powder Paint Storage?
  • stryped
  • · Replies 15 ·
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15
Appropriate tightness of bolts between skateboard and trucks
  • CynicusRex
  • · Replies 17 ·
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17
Surely this will NOT work: violation of conservation of momentum?
  • gggnano
  • · Replies 2 ·
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2
Shower Mixer Taps: Physics & Maths Explained
  • billm
  • · Replies 2 ·
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2
Are Hovering Cars the Future of Transportation?
  • Abheer Parashar
  • · Replies 17 ·
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17
Saudi Arabia's "The Line" -- why?
  • person123
  • · Replies 2 ·
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2
Most valuable trait for a scientist or engineer?
  • neanderthalphysics
  • · Replies 10 ·
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10
Ensuring Compatibility: Important Measurements for SUV Rim Size
  • DaveC426913
  • · Replies 2 ·
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2
Highest useful Fahrenheit temperature?
  • Algr
  • · Replies 39 ·
2
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39
Problem Connecting Core with Face Plates (APDL)
  • Anton223
  • · Replies 1 ·
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1
What lazy engineers achieve: A Rubiks cube that solves itself
  • jack action
  • · Replies 2 ·
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2
Unsolved Engineering Problem: Runaway Anchor Drops
  • anorlunda
  • · Replies 68 ·
3
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68
Can Aquaponics Help Conserve Water in Times of Drought?
  • TechDIYaspirant
  • · Replies 8 ·
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8
What Really Happened at Arecibo
  • jedishrfu
  • · Replies 17 ·
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17
Why are only two senses transmittable via technology?
  • Algr
  • · Replies 40 ·
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40
Is Moore's Law Still Relevant in the Age of Semiconductors and Robosourcing?
  • Gear300
  • · Replies 23 ·
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23
Question regarding water pressure and slopes
  • Jstoff
  • · Replies 5 ·
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5
Can a Vertical Jet Engine Replace Helicopter Blades for Hovering Crafts?
  • Hornbein
  • · Replies 55 ·
2
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55
"Holographic" Display with Rotating Blades
  • Leo Liu
  • · Replies 15 ·
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15
Which sub-forum would be suitable for asking Q. related to rockets?
  • Hall
  • · Replies 1 ·
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1
How could you move a substantial amount of air to a certain direction?
  • Spockishere
  • · Replies 4 ·
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4
How Does Temperature Affect the Frequency of a Guitar String?
  • piyush_1903
  • · Replies 29 ·
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29
What Do Smart Phones (Partially) Replace?
  • anorlunda
  • · Replies 188 ·
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188
News What Can Nature Teach Us? Join the Natural Robotics Contest!
  • robjds
  • · Replies 3 ·
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3
News Florida Collapsed Condominium had been sinking since 1990s
  • Astronuc
  • · Replies 199 ·
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199
Adding CF4 to the Martian Atmosphere (terraforming)
  • .Scott
  • · Replies 6 ·
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6
Squirrels and rats attacking AT&T fiber
  • anorlunda
  • · Replies 12 ·
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12
I love Octonions as well as alternative propulsion ideas
  • JarodY
  • · Replies 4 ·
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4
Is there a good source for construction blueprint symbols?
  • theycallmevirgo
  • · Replies 2 ·
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2
Project Orion Revisited: Is Nuclear Propulsion the Future of Space Travel?
  • anorlunda
  • · Replies 13 ·
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13
Could New Washing Machine Be Damaged by Delivery Guy?
  • kyphysics
  • · Replies 18 ·
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18
How to use Simpack to change the profiles of a rail
  • fzhkhel
  • · Replies 3 ·
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3
Please help explain this Blood Pressure Monitor 'calibration' system
  • NTL2009
  • · Replies 28 ·
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28
Can a Magnetohydrodynamic Drive Work Without a Tube?
  • Godspanther
  • · Replies 3 ·
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3
Wondering if there are any construction contractors on PF (looking for opinions)
  • triley
  • · Replies 5 ·
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5
NTSB Accident Report, Data Entry Error
  • anorlunda
  • · Replies 14 ·
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14
Designing Retaining Wall Around Enclosed Area
  • person123
  • · Replies 11 ·
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11
What is wrong with this picture?
  • berkeman
  • · Replies 54 ·
2
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54
Simple(?) parabolic dish design question
  • theycallmevirgo
  • · Replies 2 ·
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2
How much pressure in PSI was needed in the Ancient World to cut stones?
  • philo
  • · Replies 8 ·
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8
Engine explodes out of tractor pull semi truck
  • ElliotSmith
  • · Replies 12 ·
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12
Order of calculations for an air bubble system for dock de-icing
  • downeast
  • · Replies 14 ·
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14
How to wire a house using 3 phase
  • doggy
  • · Replies 5 ·
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5
My Dehumidifier Hygrometer Differs From Handheld by 10% on RH....OK?
  • kyphysics
  • · Replies 16 ·
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16
Industrial CO2 laser temperature management
  • theycallmevirgo
  • · Replies 5 ·
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5
Solving Ceiling Fan Woes | Home Improvement
  • rsk
  • · Replies 23 ·
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23
What was the purpose of the small button on tube television receivers?
  • homerwho
  • · Replies 48 ·
2
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48
How to measure flowrate using a differential pressure sensor
  • CadisEtramaDiRaizel
  • · Replies 8 ·
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8
Fixed gear ratio and correction tape
  • Leo Liu
  • · Replies 6 ·
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6
How does the "CLEAN" light on a coffeemaker work?
  • NTL2009
  • · Replies 3 ·
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3
Rotate IMU data to obtain correct measurement data
  • hoddy
  • · Replies 2 ·
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2
Can You Add Water to a High Efficiency Washer (There is So Little)?
  • kyphysics
  • · Replies 32 ·
2
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32
Using Monopods for city travel utilizing linear induction motors
  • Prathyush
  • · Replies 95 ·
4
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95
Wood as a carbon neutral biofuel
  • artis
  • · Replies 31 ·
2
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31
Are C7 Christmas Lights Too Hot for a Real Tree?
  • Greg Bernhardt
  • · Replies 19 ·
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19
Why doesn't the tape trick work with scotch tape?
  • Twigg
  • · Replies 3 ·
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3
Millennium Tower, San Francisco, leaning more than predicted
  • Astronuc
  • · Replies 4 ·
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4
How will the flood outflow be affected by this new diversion?
  • Point Conception
  • · Replies 8 ·
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8
Pixelation of bitmap images (pixel size, pixel density, resolution)
  • fog37
  • · Replies 31 ·
2
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31
Plug the Closed Ends of a Pipe at Depth and Bring it to the Surface
  • Guest_Alpha0
  • · Replies 4 ·
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4
HVAC engineering experts available?
  • treB321
  • · Replies 4 ·
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4
Impedance/admittance (acoustic) models for outdoor ground and seafloor
  • bustun
  • · Replies 12 ·
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12
History of "percent grade" for slope esp. in civil engineering?
  • The Bill
  • · Replies 12 ·
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12
International Harvester HT340 Turbine Tractor
  • jack action
  • · Replies 5 ·
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5
Heavy Construction Equipment Tier List
  • ergospherical
  • · Replies 7 ·
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7
Water deformation subjected to ultrasound waves
  • loophole
  • · Replies 4 ·
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4
Measuring your body volume without getting wet
  • sophiecentaur
  • · Replies 13 ·
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13
Insights When Science is Not Enough: Legal and Health Implications of Questions
  • jack action
  • · Replies 18 ·
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18
Theoretically… if I stood on a 2-metre-tall wooden post
  • MikeMarshall
  • · Replies 8 ·
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8
What's the load capacity of 6 aluminium posts?
  • MikeMarshall
  • · Replies 5 ·
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5
Safety Recalls of Vehicles and Equipment
  • jack action
  • · Replies 2 ·
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2
PEX Pipe in Residential Subfloor Thermal Mass
  • DoctorLem
  • · Replies 4 ·
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4
Air conditioner dust getting into lungs?
  • Cobul
  • · Replies 2 ·
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2
Allowable uniform loads - W beams vs. LVL
  • yahastu
  • · Replies 2 ·
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2
Truss behaviour, load-deformation curve
  • SofiaB
  • · Replies 3 ·
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3
Energy and environmental engineering silly question
  • t0mm02
  • · Replies 3 ·
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3
Prof Festo's Fantastical Flying Robot Menagerie
  • jedishrfu
  • · Replies 2 ·
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2
Freeing the stuck container ship Ever Given in the Suez Canal
  • Astronuc
  • · Replies 72 ·
3
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72
What STEM project can I do to fascinate an examination board?
  • greg_rack
  • · Replies 14 ·
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14
Gyroscopic stabilization and the cameras used in MotoGP on-bike video feeds
  • berkeman
  • · Replies 2 ·
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2
4x4" Square Tubing Generator Stand
  • klamberth27
  • · Replies 6 ·
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6
Is Having a House Really Important?
  • Kran228
  • · Replies 3 ·
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3
Building a rooftop for workshop
  • Rod_trad
  • · Replies 2 ·
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2
How many steel profiles do I need to support a workshop roof in Santiago, Chile?
  • Rod_trad
  • · Replies 3 ·
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3
Correct bore sizing for a shower hose for a pumped water supply
  • reddwarf4ever
  • · Replies 2 ·
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2
Satellite Failure: Environmental Causes & Triggers
  • Tone L
  • · Replies 3 ·
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3
De-icing the wind turbines in Texas
  • hagopbul
  • · Replies 22 ·
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22
LiFePO4 battery heater project (makes sure battery doesn't freeze)
  • mess
  • · Replies 16 ·
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16
Endless bridge around the equator and gravity
  • Drat
  • · Replies 17 ·
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17
Need to interview an engineer for an engineering paper
  • codyschellinger0731
  • · Replies 1 ·
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1
"Expected Result" Bias in Research
  • person123
  • · Replies 5 ·
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5