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Can this 747 take off?
Posted on 4/10/24 at 4:06 pm
Posted on 4/10/24 at 4:06 pm
50
Posted on 4/10/24 at 4:06 pm to Street Hawk
Oh god, not this one again.
Posted on 4/10/24 at 4:06 pm to Street Hawk
Edit: I’m an idiot.
This post was edited on 4/10/24 at 4:16 pm
Posted on 4/10/24 at 4:07 pm to Street Hawk
Edit: The wheels just don't move. The conveyor is as long as a runway.
This post was edited on 4/10/24 at 4:44 pm
Posted on 4/10/24 at 4:07 pm to Street Hawk
I remember this from 20 years ago
The doctor is the kids mother!
The doctor is the kids mother!
Posted on 4/10/24 at 4:07 pm to Street Hawk
Depends......is it made by Boeing?
Posted on 4/10/24 at 4:08 pm to Volvagia
The answer is yes. An airplane isn’t like a car. It doesn’t move by pushing against the ground. It therefore moves within the frame of reference of the air. The only thing that will happen here is the wheels would spin twice as fast, and if assembled by Boeing, fall off.
Posted on 4/10/24 at 4:09 pm to FieldEngineer
Planes don't move by power driven through the wheels. This hypothetical is impossible in reality. In reality, the thrust from the engines would move the plane off the conveyer belt.
Posted on 4/10/24 at 4:10 pm to Street Hawk
Are we still doing this phrase?
Tell me you do not know how an airplane works without telling me that you do not know how an airplane works.
If not, Admin can delete.
Tell me you do not know how an airplane works without telling me that you do not know how an airplane works.
If not, Admin can delete.
Posted on 4/10/24 at 4:10 pm to Street Hawk
the answer is yes
Posted on 4/10/24 at 4:12 pm to Street Hawk
quote:
Can this 747 take off?
Depends.
Is your mom onboard?
Posted on 4/10/24 at 4:13 pm to Street Hawk
Yes. The wheels are going to spin at 2x the airspeed.
Maybe some weird ground effect that allows for a lower rotation speed too
Maybe some weird ground effect that allows for a lower rotation speed too
Posted on 4/10/24 at 4:15 pm to Street Hawk
Nope
Posted on 4/10/24 at 4:17 pm to Street Hawk
All this time, airports and aircraft carriers could have just installed a conveyor belt.
Posted on 4/10/24 at 4:17 pm to FieldEngineer
quote:
lol did not read that correctly
Given the source, I wonder if it is deliberately phrased shittily.
As written, the plane will actually not take off.
Not because of negating airspeed, but because the speed of the conveyor would go in a positive feedback loop and go so fast that the wheels would spin themselves into destruction and ground the plane.
Posted on 4/10/24 at 4:18 pm to Street Hawk
Lift occurs with the pressure difference between the top of the wing and the bottom of the wing are great enough to overcome the force of gravity.
There is no wind blowing over the wings. No lift. This is why an aircraft carrier turns into the wind to launch. Free wind over the wings
There is no wind blowing over the wings. No lift. This is why an aircraft carrier turns into the wind to launch. Free wind over the wings
Posted on 4/10/24 at 4:21 pm to Volvagia
quote:
The answer is yes. An airplane isn’t like a car. It doesn’t move by pushing against the ground. It therefore moves within the frame of reference of the air. The only thing that will happen here is the wheels would spin twice as fastt
I accept that this is the predominant thought on this, and I also accept that I'm a dumbass, but I've always questioned that if the treadmill perfectly matches the rotational speed of the wheels, how is there movement in the X-axis? At some point the wheels would have to spin faster than the treadmill to achieve any positive X-axis movement, which nullifies the scenario of the treadmill matching the wheel speed, right?
Like, if I take a free-spinning wheel and place it on a treadmill, to move the wheel forward I have to spin the wheel faster than the treadmill is going, but if the treadmill increases it's speed to match, how am I going forward?
This post was edited on 4/10/24 at 4:22 pm
Posted on 4/10/24 at 4:24 pm to Street Hawk
No. It takes wind moving over the wings to get lift.
Capeesh?
Capeesh?
Posted on 4/10/24 at 4:26 pm to Street Hawk
As long as the belt isn’t designed to move in response to the forward motion of the plane and has its own power to match the forward motion of the plane, and thus the wheel rotation, the plane will not take off.
If it is simply a conveyor belt that matches the wheels’ rotational speed, the plane will quickly leave the treadmill.
That is simply in reality, IMO.
If it is simply a conveyor belt that matches the wheels’ rotational speed, the plane will quickly leave the treadmill.
That is simply in reality, IMO.
This post was edited on 4/10/24 at 4:26 pm
Posted on 4/10/24 at 4:28 pm to BottomlandBrew
You still are thinking of terms of forward motion coming from energy sent to the wheels.
I don’t know how else to say it. The wheels don’t even play in the physics of it all really, outside of a very marginal increase of friction.
If you put a toy car on the string of a treadmill going at a moderate speed, you don’t feel a doubling of the pull if you double the speed. You feel almost the exact same force.
Similarly, the conveyor doesn’t impart enough force to negate the thrust of the engines no matter how fast it moves.
The conveyor can be running at 10x times takeoff speed and it won’t stop the aircraft.
I don’t know how else to say it. The wheels don’t even play in the physics of it all really, outside of a very marginal increase of friction.
If you put a toy car on the string of a treadmill going at a moderate speed, you don’t feel a doubling of the pull if you double the speed. You feel almost the exact same force.
Similarly, the conveyor doesn’t impart enough force to negate the thrust of the engines no matter how fast it moves.
The conveyor can be running at 10x times takeoff speed and it won’t stop the aircraft.
This post was edited on 4/10/24 at 4:32 pm
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