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1500 questions
6
votes
1 answer
Densities of different phases of steel (austenite, bainite)
Steel seems to be a very complex material, not least because of the different phases and microstructures. At the moment, I'm especially interested in the bainite formation that happens when austenitic steel is cooled rapidly (but not rapidly enough…
Muschkopp
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6
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Did Otto Lilienthal ever experiment with non-human-powered aircraft?
Otto Lilienthal, sometimes hailed as the first aviator, became famous for his many gliders, which pioneered new experiments in aeronautics. However, powered aircraft didn't take off - pun intended - until the Wright brothers successfully flew their…
HDE 226868
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6
votes
1 answer
Calculate elasticity of rubber balloon
I am developing a model for the respiratory system of a neonate (newborn child) for a BME project by using pressure/volume data of the lungs. To model these, I plan to use a rubber balloon. However. the calculations are more difficult than I thought…
Alexm
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6
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2 answers
Why aircraft refrigeration uses a centrifugal compressor in place of reciprocating compressor?
Why aircraft refrigeration uses a centrifugal compressor in place of reciprocating compressor and a gas turbine in place of reciprocating expander?
Millie
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6
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1 answer
How is mechanism used in modern projector different from intermittent mechanism used in conventional one?
Do modern projector used for digital class works on same old conventional intermittent mechanism and blocking of light
during change of frame.
What is principal used in modern projector?
Rajakr
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6
votes
2 answers
Can the Sabatier reaction power a vehicle?
The Sabatier reaction converts CO2 to methane. Can a vehicle that burns methane recover it (at least some part) from the exhaust gases via the Sabatier reaction? I am interested to know how this would be implemented, and whether such a vehicle has…
sloupioc
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6
votes
3 answers
This device is used in washing machines to dispense water and cleaning solution in the right amounts. What is the working principal of it?
The following device is generally used in washing machines to dispense water and cleaning solution in the right amounts whenever needed. How does this device work?
Adam
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6
votes
2 answers
What is the purpose of end plates when connecting beams together?
Quite often this kind of arrangement can be seen when beams are connected together. A rectangular plate is welded into a beam, and the plate is bolted to the other beam. I suppose one purpose would be simply that bolting is easier to do in some…
S. Rotos
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6
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1 answer
Making a mechanical device to measure the radius of the Earth
I want to design an experiment to show (in an educational context) how we can measure the radius of the Earth without using modern technology in order to demonstrate the engineering achievements of those who did it so long ago, and to show some…
jhabbott
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6
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2 answers
Tube Steel - ASTM A1085 vs. A500
Recently, tube steel manufacturers in the US have begun using the new ASTM A1085 specification for forming tube steel (a.k.a. hollow structural section or HSS) shapes, as opposed to the existing A500 specification.
From what I've read (here and…
grfrazee
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6
votes
6 answers
What will happen if I run a submersible pump without water?
I have a submersible pump and it's clearly stated in the user manual that it should not be operated without water.
But what will happen if it's not adhered to? The obvious answer is that it will malfunction. But I want to know what causes the…
user221238
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6
votes
0 answers
Conservative rebar dowel hole sizing and embedment depth
My question concerns the hole sizing and embedment depth of post installed rebar which is secured with epoxy mortar into a hole in a reinforced concrete slab.
Hole diameter sizing
My assumption #1 is that the minimum and maximum size of the hole…
egg
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6
votes
3 answers
How do I calculate the max flow rate for a pump with no power restrictions?
Let's assume we have a pump and it can draw as much power as it needs. As the pump speeds up, it creates vacuum in the intake. At some point it draws the gas/liquid so fast, the intake pressure is so close to 0. At that point, no matter how much…
Cathier
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6
votes
1 answer
Laser diode input/output ratio
I am a photo technician working in photographic labs to repair printing machines.
I am trying to better understand how these machines operate.
Blue laser gun
Laser gun type = 473 $nm$ blue dpss.
On label = maximum output 50 $mW$, 473 $nm$, type 3b…
SARDAR TARIQ
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6
votes
3 answers
How to prevent shorts between exposed battery terminals and racing vehicle chassis
I have a small issue that is causing a lot of problems. I'm on a Formula SAE team and our battery is consistently shorting between our positive terminal and our chassis. Our chassis is the grounding point.
Our battery is underneath our seat, our…
Adam
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