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 OT Plane on a Treadmill
#763544
11/08/06 05:11 AM
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Joined: Mar 2005
Posts: 381
OP
Mudrunner
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A plane is standing on a runway that can move (like a giant conveyor
belt). This conveyor has a control system that tracks the plane's
speed and tunes the speed of the conveyor to be exactly the same (but
in the opposite direction) instantly.
Will the plane be able to take off?
02 Ford F-250 4X4 PSD...zero body damage
67 Weimann 18' Jet boat...zero body damage except for the trailer drags on the ground from time to time
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Re: OT Plane on a Treadmill
[Re: Roll_me_over]
#763545
11/08/06 05:20 AM
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Joined: Apr 2002
Posts: 3,622
Roll Me Over
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I would think so. The plane's propulsion is pushing against the air, not the ground.
'06 Dakota QC 4.7 6sp 4x4
'88 Mighty Max
'77 KZ1000 fun old bike
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Re: OT Plane on a Treadmill
[Re: Roll_me_over]
#763546
11/08/06 05:31 AM
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Joined: Sep 2002
Posts: 3,634
Roll Me Over
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If the plane is standing on the conveyor belt, and the conveyor belt moves at the speed the plane is being propelled - then nothing is moving at all <img src="/forums/images/graemlins/butwiggle.gif" alt="" /> Other things to ponder
concreteprinter.com
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Re: OT Plane on a Treadmill
[Re: bretwalda]
#763547
11/08/06 06:02 AM
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Joined: Sep 2001
Posts: 8,557
Forum Moderator
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The factor that you have to look at is AIR speed. NOT ground speed. The rolling resistance of the wheels will matter little in comparison to the thrust of the engines.
The plane would need sufficient air speed to lift off, and thats irrelevant to ground speed.
Yes it will take off, and when it does the wheels will see twice the airspeed.
Example... if 150knots airspeed is needed for liftoff, the wheels will see 300 knots groundspeed.
87 Raider 4D56td v5MT1
31's..Basically Stock
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Re: OT Plane on a Treadmill
[Re: LandRaider]
#763548
11/08/06 06:09 AM
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Joined: Mar 2005
Posts: 381
OP
Mudrunner
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This is gonna get interesting. This is over on another site and up to 40 pages... <img src="/forums/images/graemlins/lol.gif" alt="" /> <img src="/forums/images/graemlins/smile.gif" alt="" />
02 Ford F-250 4X4 PSD...zero body damage
67 Weimann 18' Jet boat...zero body damage except for the trailer drags on the ground from time to time
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Re: OT Plane on a Treadmill
[Re: Roll_me_over]
#763549
11/08/06 07:03 AM
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Joined: Jul 2004
Posts: 546
Rock Warrior
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I don't think the planes own engines would suck air across its wings at a sufficient speed to create the necessary lift without the actual aircraft itself moving through the air. Lift is created by the difference in air pressure on the top and bottom of the wing, right? That means air has to be moving across the wing surface which wouldn't happen if the plane was effectively stationary, right?
'87 Raider w/rebuilt 2.6
Weber 32/36
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Re: OT Plane on a Treadmill
[Re: Jamez]
#763550
11/08/06 07:11 AM
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Joined: Nov 2002
Posts: 7,892
Web Wheeler
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I say it's not going anywhere. It has to move to create air speed, and it's not going to create any sitting still. Get on a treadmill, set it to high, and run your buns off...feel any wind in your hair? <img src="/forums/images/graemlins/lol.gif" alt="" /> But on second thought, forward momentum isn't created by the wheels, but by moving air...so...I dunno. Someone prove this one way or the other! <img src="/forums/images/graemlins/lol.gif" alt="" />
Last edited by stony-man; 11/08/06 07:17 AM.
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Re: OT Plane on a Treadmill
[Re: stony-man]
#763551
11/08/06 07:47 AM
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Joined: Sep 2001
Posts: 8,557
Forum Moderator
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It will actually MOVE foward on the treadmill against the direction even though the treadmill is going backards, and create airspeed.
The wheels are not a drive device... only there to support it until its gets enough airspeed to take off.
I do not know how to explain it better than that. Kevin.. Eddy.. help me out.
87 Raider 4D56td v5MT1
31's..Basically Stock
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Re: OT Plane on a Treadmill
[Re: LandRaider]
#763552
11/08/06 07:48 AM
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Joined: Sep 2001
Posts: 8,557
Forum Moderator
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Read my first post, and it should be clear. actually read it.
87 Raider 4D56td v5MT1
31's..Basically Stock
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Re: OT Plane on a Treadmill
[Re: LandRaider]
#763553
11/08/06 08:10 AM
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Joined: Sep 2004
Posts: 4,479
Roll Me Over
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I was about to post the same thing LR, the wheels are there for support and support only. The wheels will spin fast as hell when your moving down the treadmill though. If you wanted to shorten take off runways, a slingshot device would be far more realistic. Although the passengers would be less than happy with the amount of Gs they would pull to make the big plane take off on such a short distance. <img src="/forums/images/graemlins/shiner.gif" alt="" />
Richard E 1989 Montero - Stock-ish 1989 V6 Auto Raider - 5.3 Vortech Swap. 1987 Mitsubishi Starion 2.6t, soon to be 3.5 1983 Honda XL600R 
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