What Myth would you want to see busted?

[FnG]magnolia;21282562 said:
Can we have a show of hands of who is intentionally taking the **** and who is deadly serious? Because I can't tell right now and I probably should be able to, you know, tell.
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The issue is, I think everyone's being seriuse.
Just like the people who actually think a plane won't take off on a conveyor belt. It doesn't make them right.
 
Ok, put it this way... Imagine starting an engine where the crankshaft is held by a giant clamp but the casing is free. What will happen? Think carefully now...
 
neodude said:
Ok, put it this way... Imagine starting an engine where the crankshaft is held by a giant clamp but the casing is free. What will happen? Think carefully now...
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The casing now moves but again this is nothing like the original question. Equal and opposit reactions and all that.
We are not clamping the blades. The casing is the one clamped.
 
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Glaucus said:
It isn't, go look at an engine diagram.
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Dude i'm a professional mechanical engineer and I've built my own car from scratch. I dont need to look at diagrams to know what nutsack you're talking. There are clever poeple on here - notice how none of them are agreeing with you.

If you can, please answer my questions in post 69. They are very simple.

Regarding my long post above where I explain you can argue these experiments either way depending on which bits of reality you decide to include or ignore, out of interest, which of those do you understand and agree/disagree with?

Arrghhh I'm going to bed.
 
Glaucus said:
The casing now moves but again this is nothing like the original question. Equal and opposit reactions and all that.
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Ok, now we are getting somewhere. Now put the engine in a heli and stick rotors on the crankshaft. Suspend the helicopter by the clamped rotors and run the engine at 1000 rpm, what happens?....
 
Liampope said:
Dude i'm a professional mechanical engineer and I've built my own car from scratch. I dont need to look at diagrams to know what nutsack you're talking. There are clever poeple on here - notice how none of them are agreeing with you.

If you can, please answer my questions in post 69. They are very simple.

Regarding my long post above where I explain you can argue these experiments either way depending on which bits of reality you decide to include or ignore, out of interest, which of those do you understand and agree/disagree with?

Arrghhh I'm going to bed.
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Since when has a mechanics need to understand physics. Do you think your the only one to build cars and yes people are agreeing with me.
 
[FnG]magnolia;21282562 said:
Can we have a show of hands of who is intentionally taking the **** and who is deadly serious? Because I can't tell right now and I probably should be able to, you know, tell.
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I'm deadly serious. I initially thought Glacus was too, but now it seems more like he's trying to wind people up. :)
 
neodude said:
Ok, now we are getting somewhere. Now put the engine in a heli and stick rotors on the crankshaft. Suspend the helicopter by the clamped rotors and run the engine at 1000 rpm, what happens?....
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Again this is different physics and properties, we aren't clamping the blades.

Runnning engines backwards is not the same at all.

It's quite simple does rotating the casing stop the pistons from moving up and down?
If not where is all that power and rotation going?
 
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Glaucus said:
Again this is different physics and properties, we aren't clamping the blades.

Runnning engines backwards is not the same at all.

It's quite simple does rotating the casing stop the pistons from moving?
If not where is all that power and rotation going?
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I'm not running the engine backwards. It's not different physics, indulge me and answer the question please. What happens when you suspend the helicopter by the rotors and run the engine at 1000rpm?
 
neodude said:
I'm not running the engine backwards. It's not different physics, indulge me and answer the question please. What happens when you suspend the helicopter by the rotors and run the engine at 1000rpm?
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If you clamp blades the engine casing rotates, that will rotate if it has enough power the body, that depends on how the engine is situated to which direction.

It Very much is different.

Then your going to say put a turntable on the bottom, this doesn't work as you know have a closed system becuase the blades are clamped. Changing the physics.
 
It's quite simple does rotating the casing stop the pistons from moving up and down?
If not where is all that power and rotation going?
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Stationary engine: The power is going to rotate the shaft, relative to the engine.
Rotating engine: See above

???

What aren't you getting
 
Glaucus said:
If you clamp blades the engine casing rotates, that will rotate if it has enough power the body, that depends on how the engine is situated to which direction.

It Very much is different.

Then your going to say put a turntable on the bottom, this doesn't work as you know have a closed system becuase the blades are clamped. Changing the physics.
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Yep, turntable on the bottom then release the clamp. Rotors remain still.
 
neodude said:
Stationary engine: The power is going to rotate the shaft, relative to the engine.
Rotating engine: See above

???

What aren't you getting
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What's I'm getting at is you haven't add the forces up correctly.
Turntable turns. That turns helicopter in one direction and applies the same force in the opposite direction to the turn table, but that doesn't rotate as it's fixed.

Now we have a second lot of power inpt, that's Dom he engine, which turns. This now turns the blades equalling the engines force.

Total force now equals zero.

In your opinion.
Turntable and body council out. Great as it should be.
Engines producing power, but not turning blades. No where's that opposite force countering the engine? Or wait you haven't included that.

In your. Equation we have.
Power into turntable - power transferred to body, engine power - blades rotation
1000 - 1000 + 1000 - 0, why doesn't this equal zero? Equal and opposit reaction, it should equal zero.

You now have an equaation that does not follow physics. As its all lopsided.
 
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