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Plane on conveyor belt
Posted:
Mon Jan 11, 2010 3:08 pmby expat
Firstly this could be the video forum, real aviation or general, so as required MODS....anyway
Plane on conveyor belt, the cause of many threads and conversation web wide and quite a few at Simv. Well, Mythbusters have done the plane on conveyor belt full size. I still see some holes in this test, but..........
The theoryPlane on conveyor beltMatt
Re: Plane on conveyor belt
Posted:
Mon Jan 11, 2010 3:11 pmby C
Re: Plane on conveyor belt
Posted:
Mon Jan 11, 2010 3:19 pmby expat
But Mythbusters are the answers to all our questions
Matt
Re: Plane on conveyor belt
Posted:
Mon Jan 11, 2010 4:05 pmby patchz
[color=#000000]You don't wanna try it with the VC10 Charlie?
Re: Plane on conveyor belt
Posted:
Mon Jan 11, 2010 4:10 pmby DaveSims
As much as I usually like the mythbusters, I think they completely missed the whole point of that myth.
Re: Plane on conveyor belt
Posted:
Mon Jan 11, 2010 4:11 pmby patchz
As much as I usually like the mythbusters, I think they completely missed the whole point of that myth.
Which was?
Re: Plane on conveyor belt
Posted:
Mon Jan 11, 2010 4:14 pmby DaveSims
The original myth is that if the aircraft was on a conveyor belt going X mph, and its forward speed on the conveyor belt was equal to X, would it fly? Now any pilot would know the difference between airspeed and groundspeed, and their relationship to lift. When the mythbusters conducted the myth however, the aircraft actually moved faster than the conveyor belt, which gave it a forward airspeed, and it flew. Since the plane actually took off, they claimed the myth was true.
Re: Plane on conveyor belt
Posted:
Mon Jan 11, 2010 5:10 pmby Jeff.Guo
Urm, I think you missed the point of about the physics...
...aircraft wheels are free rolling. It doesn't matter how fast the conveyor belt is moving, an unpowered aircraft will ALWAYS be stationary, minus static friction between the rubber on the tire and the belt.
...of course, this also means that any thrust would propel the aircraft forward.
Re: Plane on conveyor belt
Posted:
Mon Jan 11, 2010 5:17 pmby Cobra
I am really confused as to how there is any confusion over this? Lift is generated by airflow over the wing and thus airspeed is the only thing of relevance? If the belt is moving at the exactly same speed as the aircraft, then airspeed and the lift produced is null.
Are they saying that because the wheels are spinning it should fly
Re: Plane on conveyor belt
Posted:
Mon Jan 11, 2010 5:28 pmby B-Valvs
I was about to post this (
http://www.youtube.com/watch?v=S377HwOthjo), but then I saw that it was already posted.
I don't see why this is hard to understand either. They expain it very well. The conveyor belt does not affect the plane.
8-)
Re: Plane on conveyor belt
Posted:
Mon Jan 11, 2010 5:28 pmby Jeff.Guo
The stationary aircraft over on a conveyor belt is a straw man point...
...with an airworthy undercarriage, the aircraft throttle would be somewhere around idle for it to accomplish that.
...the point is that the conveyor have virtually no effect on the performance of the aircraft. I.e. there is little difference between a conveyor and a regular runway.
Re: Plane on conveyor belt
Posted:
Mon Jan 11, 2010 8:23 pmby DaveSims
Urm, I think you missed the point of about the physics...
...aircraft wheels are free rolling. It doesn't matter how fast the conveyor belt is moving, an unpowered aircraft will ALWAYS be stationary, minus static friction between the rubber on the tire and the belt.
...of course, this also means that any thrust would propel the aircraft forward.
So was the point of the myth that the friction of the undercarriage having to spin twice as fast as normal would be sufficient to prevent takeoff? It happens anytime an aircraft takes off downwind.
Re: Plane on conveyor belt
Posted:
Mon Jan 11, 2010 8:46 pmby Jeff.Guo
[quote]So was the point of the myth that the friction of the undercarriage having to spin twice as fast as normal would be sufficient to prevent takeoff?
Re: Plane on conveyor belt
Posted:
Mon Jan 11, 2010 9:58 pmby B-Valvs
[quote][quote]So was the point of the myth that the friction of the undercarriage having to spin twice as fast as normal would be sufficient to prevent takeoff?
Re: Plane on conveyor belt
Posted:
Tue Jan 12, 2010 4:41 amby BAW0343
[quote][quote]So was the point of the myth that the friction of the undercarriage having to spin twice as fast as normal would be sufficient to prevent takeoff?
