If this is your first visit, be sure to check out the FAQ by clicking the link above.
You may have to register before you can post: click the register link above to proceed.
To start viewing messages, select the forum that you want to visit from the selection below.
Open ForumsThe Open forum was created for people to discuss anything else Non-Moto related. Just about anything goes! Please remember this is a loosely moderated area. If you do not have thick skin. We suggest you stay out of here.
That's exactly my point...... An aircraft is propelled forward by the thrust of it's engine or engines (propellor or turbine makes no difference), relative to the atmosphere around it. The speed of the wheels rotation in relation to the ground has absolutely no impact on the aircrafts movement.
correct....but if the treadmill is going the same speed as the plane is moving, then its not moving forward because the wheels are just spinning while the plane sits in place, and not creating any lift
__________________
R.I.P Shawn "Krazy Hawaiian" McCallister July 11, 1956 - July 23, 2007
We will miss you.
correct....but if the treadmill is going the same speed as the plane is moving, then its not moving forward because the wheels are just spinning while the plane sits in place, and not creating any lift
correct....but if the treadmill is going the same speed as the plane is moving, then its not moving forward because the wheels are just spinning while the plane sits in place, and not creating any lift
But the aircraft in your example ISN'T moving, is it??? Thus the treadmill WOULDN'T be moving, either. You're misunderstanding the problem.....
The treadmill's speed is EQUAL to the speed of the aircraft.......
Re-read the problem, then my post at the bottom of page 10. Then, hopefully, you'll see what I mean......
The forward motion of the aircraft can only be prevented by an equal force acting against it. Spinning wheels produce NO transfer of an opposing force......
__________________ Able to split an infinitive at the speed of sound!
Are we talking about a VTOL aircraft? If yes, then it is possible. Otherwise hell no it won't move until the wings provide sufficient lift (from airspeed not ground speed) to lift the aircraft off the ground.
__________________
Life is all about ass; you're either covering it, laughing it off, kicking it, kissing it, busting it, trying to get a piece of it, or behaving like one.
Once you have flown, you will forever walk the Earth with your eyes turned skyward, for there you have been, and there you long to return.
Four wheels move the body; two wheels move the soul.
Are we talking about a VTOL aircraft? If yes, then it is possible. Otherwise hell no it won't move until the wings provide sufficient lift (from airspeed not ground speed) to lift the aircraft off the ground.
Read page 10......
__________________ Able to split an infinitive at the speed of sound!
in the up down plane:
Force from gravity pulls down
Force from ground pushes normal to wheels
Net: Zero force
in the front back plane:
Propellers exert force on air backwards
Air pushes on propellers forwards
negligible forces restrict wheels from rolling
Net: Force on hull pulls forward = Plane accelerates forward
Conclusion... Plane accelerates forward.
Net effect from ground = nothing (REGARDLESS OF MATCHING SPEED... going forward, going backward, accelerating forward, accelerating backward... PERIOD)
Net effect: Plane accelerates forward till the needed air speed is reached and it takes off normally, needing the same length of run way as the air speed requires... regardless of tredmill.
Posts: 4,526
Casino Cash: $41924
Sportbike: See sig.
i just want to say that IT DOESN'T MATTER WHAT THE CONVEYOR BELT IS DOING...
it can match the speed of the air, it can match the speed of the aircraft, it can match the speed of Haley's fucking comment, it can match the speed of tears that are rolling down my cheeks due to the fact that I've lost all hope in humanity because this thread.... it doesn't fucking matter.... assuming the tires don't explode, THE PLANE WILL TAKE OFF.
Here's a little experiment you can do yourself if you have an RC car and access to a treadmill:
car=airplane.
treadmill=conveyor belt (duh!)
Now with the remote control try and move the car up the belt and try to match the car's speed with the belt. If you do it perfectly, the car will stay stationary as you match the speed, this is because the car is being powered by its wheels. We all know that the wheels do not drive the aircraft down the runway. Now put the remote controller aside, you have now proven to yourself that if the vehicle is driven by its wheels, it will remain stationary because the belt will counter any forward motion.
Now let's add a turbine engine... yes I know you must be fresh out of those so let's use the next best thing; your hand.
Your hand, just like the turbine engine will power the vehicle by means other than its wheels. Now let's try do the same again:
Put the car on the treadmill and move it with your hand and try your best to match the car's speed with the belt. Tell you what, you can even cheat, set the belt to 10 mph and put the car on it and move it to your best guess of what 1mph is. You will feel some resistance from the electric motor but if you try and keep that 1 mph you will eventually run up the belt.
Ground speed: 11mph
Actual speed: 1mph
In the real world, chances are that the tires/bearings of the plane will fail because they're not designed to spin at 300+mph, but this is conceptual physics and in the world of conceptual physics the plane will fly with an airspeed of approximately 155 mph and ground speed of about 310 mph.
Wow I know it's stupid to quote myself but I think it's necessary.
I thought people would call me stupid for bringing up something that was already figured out.
Linear Mode
