- My Forums
- Tiger Rant
- LSU Recruiting
- SEC Rant
- Saints Talk
- Pelicans Talk
- More Sports Board
- Fantasy Sports
- Golf Board
- Soccer Board
- O-T Lounge
- Tech Board
- Home/Garden Board
- Outdoor Board
- Health/Fitness Board
- Movie/TV Board
- Book Board
- Music Board
- Political Talk
- Money Talk
- Fark Board
- Gaming Board
- Travel Board
- Food/Drink Board
- Ticket Exchange
- TD Help Board
Customize My Forums- View All Forums
- Show Left Links
- Topic Sort Options
- Trending Topics
- Recent Topics
- Active Topics
Started By
Message
re: Can this 747 take off?
Posted on 4/11/24 at 7:19 pm to LNCHBOX
Posted on 4/11/24 at 7:19 pm to LNCHBOX
quote:
Of course, just like the plane would move. This is simple physics. There is no force that cancels out the force from the jet. This is essentially the same as asking if a jet will cause motion over a frictionless surface. The answer is yes, because the jet is not relying on transferring power to the ground to move.
I don’t think it’s the same as frictionless. There is a force of gravity that the wheels help overcome with the thrust of the jet. If the conveyor is matching the speed then it’s not creating pressure over the wing. It’s hypothetical and they are not saying that the thrust of the jet can double the speed of the conveyor. It’s saying it matches which I would assume is any thrust the jet can create. Over a frictionless surface the plane can take off with concrete blocks.
I feel like a prop plane of some sort could create enough pressure over the wing to create lift but that is not what this example is showing.
1
Posted on 4/11/24 at 7:23 pm to Art Vandelay
quote:
There is a force of gravity that the wheels help overcome with the thrust of the jet.
Would love to hear more about how the wheels overcome the force of gravity.
Posted on 4/11/24 at 7:41 pm to LNCHBOX
Ok maybe I worded that wrong. But this is not the same example as was floating around before. There is zero movement. It’s not a treadmill or a conveyor. It says it matches the speed. Which means it doesn’t move forward. Ever. No forward no up unless you are in an F35
Posted on 4/11/24 at 7:51 pm to Art Vandelay
I'd ask again what forces are counteracting the thrust of the jets to keep the plane from moving, but some of y'all just refuse to understand.
Posted on 4/11/24 at 8:02 pm to LNCHBOX
quote:
I'd ask again what forces are counteracting the thrust of the jets to keep the plane from moving, but some of y'all just refuse to understand.
The speed of the conveyor belt dumbass.
Posted on 4/11/24 at 8:08 pm to Art Vandelay
Think about this scenario…
You have a small 6” wingspan model plane made of very light balsa wood, and a little propeller. The plane is so light weight that it doesn’t really need that much speed to get airborne. Because of this, the lift off velocity is attainable by the treadmill in your basement.
You set the tread mill to 0 degrees angle and it is flat with no angle relative to normal plane gravity.
Then you set the plane on the treadmill, and turn the treadmill on. The treadmill starts and the plane rides the treadmill right off the back. You realize you need to hold the airplane in place with your hand while the propeller is not spinning or else it will ride off the back of the treadmill, even though it is on wheels. The hot wheel car also rides off the back just like this even though it has wheels.
Since you need to hold the airplane in place to keep it from riding off the back, there is a force being transmitted that you must overcome…. Even though there are wheels.
So you turn the propeller on and the plane starts to creep forward, now you increase tread speed, and the plane slows its forward progress, you increase a bit more, and the plane stops but the propeller is still spinning.
You have balanced the forces.
You have a small 6” wingspan model plane made of very light balsa wood, and a little propeller. The plane is so light weight that it doesn’t really need that much speed to get airborne. Because of this, the lift off velocity is attainable by the treadmill in your basement.
You set the tread mill to 0 degrees angle and it is flat with no angle relative to normal plane gravity.
Then you set the plane on the treadmill, and turn the treadmill on. The treadmill starts and the plane rides the treadmill right off the back. You realize you need to hold the airplane in place with your hand while the propeller is not spinning or else it will ride off the back of the treadmill, even though it is on wheels. The hot wheel car also rides off the back just like this even though it has wheels.
Since you need to hold the airplane in place to keep it from riding off the back, there is a force being transmitted that you must overcome…. Even though there are wheels.
So you turn the propeller on and the plane starts to creep forward, now you increase tread speed, and the plane slows its forward progress, you increase a bit more, and the plane stops but the propeller is still spinning.
You have balanced the forces.
This post was edited on 4/11/24 at 8:09 pm
Posted on 4/11/24 at 8:09 pm to TeddyPadillac
quote:
The speed of the conveyor belt dumbass.
He'll acknowledge if the engines are off the treadmill forces will move the plane backwards, but then ignore them all together once those big engines are on.
He forgets how infinitely fast our magic treadmill is.
This post was edited on 4/11/24 at 8:15 pm
Posted on 4/11/24 at 8:17 pm to TeddyPadillac
quote:
The speed of the conveyor belt dumbass.
And how is that force applied?
Posted on 4/11/24 at 8:20 pm to NATidefan
quote:
He'll acknowledge if the engines are off the treadmill forces will move the plane backwards, but then ignore them all together once those big engines are on.
Which thread are you reading?
quote:
He forgets how infinitely fast our magic treadmill is.
You've forgotten how a plane works, supposed pilot
Posted on 4/11/24 at 8:25 pm to LNCHBOX
quote:
And how is that force applied?
I build a jet powered treadmill that remotely matches my jets ground speed in the opposite direction. It’s pretty cool. You should come check it out.
Posted on 4/11/24 at 8:26 pm to LNCHBOX
This one...
I think you are just trolling at this point. Have fun.
Posted on 4/11/24 at 8:29 pm to Power-Dome
How do y'all explain this?
Posted on 4/11/24 at 8:29 pm to Art Vandelay
22 pages all knowing the plane would stay stationary? 
Posted on 4/11/24 at 8:30 pm to Art Vandelay
quote:
I build a jet powered treadmill that remotely matches my jets ground speed in the opposite direction.
Congrats on confirming you don't understand why the jet form of propulsion is important here.
Posted on 4/11/24 at 8:33 pm to NATidefan
That doesn't say what you claim I said. I even brought up the balls on the treadmill example there. How do you explain the gif I posted? Shouldn't the balls just roll off?
Posted on 4/11/24 at 8:33 pm to Street Hawk
Trick question…that 747 identifies as piece of cutlery upon the titanic.
Posted on 4/11/24 at 8:40 pm to G2160
quote:
The free-spinning wheels make the conveyor irrelevant.
At what point does ball bearing friction create drag?
Posted on 4/11/24 at 8:40 pm to LNCHBOX
quote:
The treadmill isn't moving
The treadmill, the plane's wheels or the engines would burn up if all forces were equal and accelerating. Otherwise, the plane stays put.
This post was edited on 4/11/24 at 8:42 pm
Posted on 4/11/24 at 8:45 pm to LNCHBOX
quote:
How do y'all explain this?
Newton's first law?
Posted on 4/11/24 at 8:46 pm to loogaroo
All I know is them wheels better be spinning as fast as that tread mill.
Or else....
Or else....
Page 22 of 26
Popular
Back to top
Follow TigerDroppings for LSU Football News