| View previous topic :: View next topic |
| Author |
Message |
Unbeliever
Forum Master
Joined: 11 Apr 2005
Posts: 2557
Local time: 9:12 AM
Location: The exact center of my observable universe
|
 Posted: Thu Aug 28, 2008 11:27 pm Post subject: Another method of achieving lift? |
  |
|
I was thinking about Bernouli's principle, which shows how to get lift by creating a difference in air pressure above and below the wings of an aircraft, and became curious as to whether a difference in pressure arrived at by other means might also result in lift. Specifically, if air were chilled below a platform (making it denser) and heated above the platform (making it less dense), would the resulting difference in pressure creaste lift sufficient to raise the platform?
_________________
"True wisdom is less presuming than folly. The wise man doubteth often, and changeth his mind; the fool is obstinate, and doubteth not; he knoweth all things but his own ignorance."
Akhenaton?( c. B.P. 1575)
Science is a lighthouse,
Faith is the rocks below.
God Not Found - resources for atheist/agnostics
"the universe is under no obligation to be easy for us to comprehend."
moloth |
|
| Back to top |
|
 |
|
|
|
Eyedunno
The Great JuJu at the Bottom of the Sea
Joined: 13 Aug 2005
Posts: 3811
Local time: 2:12 AM
Location: Cin City, OH!
|
| Posted: Fri Aug 29, 2008 12:05 am Post subject: Re: Another method of achieving lift? |
|
|
| Unbeliever wrote: | | I was thinking about Bernouli's principle, which shows how to get lift by creating a difference in air pressure above and below the wings of an aircraft, and became curious as to whether a difference in pressure arrived at by other means might also result in lift. Specifically, if air were chilled below a platform (making it denser) and heated above the platform (making it less dense), would the resulting difference in pressure creaste lift sufficient to raise the platform? |
Well, there are hot-air balloons. What you're talking about is a fine way to get lift, but not a practical way to travel any distance, as you would have to have forward thrust and use massive amounts of energy heating/cooling the air VERY quickly indeed. Might as well use a wing. |
|
| Back to top |
|
|
Unbeliever
Forum Master
Joined: 11 Apr 2005
Posts: 2557
Local time: 9:12 AM
Location: The exact center of my observable universe
|
| Posted: Fri Aug 29, 2008 12:59 pm Post subject: |
|
|
Thanks Eyedunno! I didn't really expect it to be practical, I was just wondering whether it could provide lift. I expect that the lift it might provide is less than that needed to generate the cold/hot gradient, since the machinery involved would be fairly heavy, so the lift to weight ratio wouldn't be insufficient to be useful.
_________________
"True wisdom is less presuming than folly. The wise man doubteth often, and changeth his mind; the fool is obstinate, and doubteth not; he knoweth all things but his own ignorance."
Akhenaton?( c. B.P. 1575)
Science is a lighthouse,
Faith is the rocks below.
God Not Found - resources for atheist/agnostics
"the universe is under no obligation to be easy for us to comprehend."
moloth |
|
| Back to top |
|
|
|
|
|
Profile
Log in to check your private messages
Log in
Live Video and Chat Room
Freethought Videos
FAQ
Search
Usergroups
Register
