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  #51  
Old 11-23-2005, 11:22 AM
TheWorstPlayer TheWorstPlayer is offline
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Location: Boring work = post too much
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Default Re: think about this...

I have seen this contraption work.
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  #52  
Old 11-23-2005, 11:23 AM
Slow Play Ray Slow Play Ray is offline
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Default Re: think about this...

In a perfect world, that contraption should stand perfectly still, no?

P.S. Damn thread hijacker - not everyone understand the plane problem yet!
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  #53  
Old 11-23-2005, 11:24 AM
daryn daryn is offline
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Join Date: Apr 2003
Location: Boston, MA
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Default Re: think about this...

[ QUOTE ]
[ QUOTE ]
[ QUOTE ]
doubtful, that fan doesn't look very powerful.

if it did move, it would move backwards.

[/ QUOTE ]

pretend it's powerful enough

[/ QUOTE ]

Can we pretend it runs on batterys too?

[/ QUOTE ]

yes, whatever
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  #54  
Old 11-23-2005, 11:24 AM
IndieMatty IndieMatty is offline
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Join Date: Jun 2004
Location: Losing 4/8 Stud Player
Posts: 365
Default Re: think about this...

[ QUOTE ]
[ QUOTE ]
[ QUOTE ]
doubtful, that fan doesn't look very powerful.

if it did move, it would move backwards.

[/ QUOTE ]

pretend it's powerful enough

[/ QUOTE ]
i have zero college training, but the forces should balance, no? no movement of the skateboard (assuming the sail and fan are secured to the board)

[/ QUOTE ]

I can't believe you're seriously answering this. It's plugged into a friggin outlet. It's not going anywhere. Holy [censored]!
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  #55  
Old 11-23-2005, 11:26 AM
MelK MelK is offline
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Join Date: Jun 2004
Posts: 41
Default Re: think about this...

[ QUOTE ]
[ QUOTE ]
[ QUOTE ]
doubtful, that fan doesn't look very powerful.

if it did move, it would move backwards.

[/ QUOTE ]

pretend it's powerful enough

[/ QUOTE ]
i have zero college training, but the forces should balance, no? no movement of the skateboard (assuming the sail and fan are secured to the board)

[/ QUOTE ]

Don't think of the sail as an opposing force, but rather as a redirecting force.

If you blow into your cupped hands, you are redirecting the wind, not canceling it.
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  #56  
Old 11-23-2005, 11:26 AM
mostsmooth mostsmooth is offline
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Join Date: Nov 2002
Location: AC
Posts: 153
Default Re: think about this...

[ QUOTE ]
your conveyor system, in essence, removes the wheels.

[/ QUOTE ]
this is not right
youre right the wheels purpose is to remove friction, but the axles dont care how fast or slow the wheels spin, and the plane is essentially floating. now all you need is some thrust
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  #57  
Old 11-23-2005, 11:27 AM
MelK MelK is offline
Member
 
Join Date: Jun 2004
Posts: 41
Default Re: think about this...

[ QUOTE ]
[ QUOTE ]
[ QUOTE ]
[ QUOTE ]
doubtful, that fan doesn't look very powerful.

if it did move, it would move backwards.

[/ QUOTE ]

pretend it's powerful enough

[/ QUOTE ]
i have zero college training, but the forces should balance, no? no movement of the skateboard (assuming the sail and fan are secured to the board)

[/ QUOTE ]

I can't believe you're seriously answering this. It's plugged into a friggin outlet. It's not going anywhere. Holy [censored]!

[/ QUOTE ]

The question was "will it move?", not "how far will it move?"
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  #58  
Old 11-23-2005, 11:27 AM
Eurotrash Eurotrash is offline
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Join Date: Jan 2005
Posts: 566
Default Re: think about this...

[ QUOTE ]
In a perfect world, that contraption should stand perfectly still, no?

P.S. Damn thread hijacker - not everyone understand the plane problem yet!

[/ QUOTE ]


this entire thread is making me wish I paid more attention in the fluid mechanics course I took. I think now that your OP has been reworded, Ray, that I understand what the situation you're actually describing is
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  #59  
Old 11-23-2005, 11:28 AM
Slow Play Ray Slow Play Ray is offline
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Join Date: Oct 2004
Location: Beantown
Posts: 527
Default Re: think about this...

[ QUOTE ]
[ QUOTE ]
your conveyor system, in essence, removes the wheels.

[/ QUOTE ]
this is not right
youre right the wheels purpose is to remove friction, but the axles dont care how fast or slow the wheels spin, and the plane is essentially floating. now all you need is some thrust

[/ QUOTE ]

Ah, I misunderstood what he meant by "removes the wheels" - this is correct.
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  #60  
Old 11-23-2005, 11:31 AM
Slow Play Ray Slow Play Ray is offline
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Join Date: Oct 2004
Location: Beantown
Posts: 527
Default Re: think about this...

[ QUOTE ]
I think now that your OP has been reworded, Ray, that I understand what the situation you're actually describing is

[/ QUOTE ]

[img]/images/graemlins/confused.gif[/img] I didn't reword the OP at all - I only generalized that it could be basically any kind of plane, and specified there is no wind.
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