I have for a long time tried to come up with a way to create an area of
total pneumatic vacuum so I could make it lift an object.. Especially in an
electrical or acoustic fashion.. But this seems very promising.. Just think
the C-5 cargo aircraft creates an about 2.5 psi difference (Bernoulli's
principal) between the top of the wing and the bottom, to get off the
ground... Yea yea yea, Newtons action reaction also comes into play after
the aircraft gets off the ground.. but that's not the point... But the C-17
cargo plane can land and take off in a shorter distance than the C-5, but
its no surprise since it only needs to develop just over 1 psi upper/lower
difference.. So to get a 14.7psi or so... WOW! what a lifting force... As
long as the container or object doesn't weigh a bazillion tons and nullify
it....
Terry Bastian
At 07:08 AM 10/24/2005, Jerry Decker - KN wrote:
Hola Folks!
Something that has fired my imagination in this days posts;
http://www.aoi.com.au/ideasbank/5813.htm
10/24/05 - Vacuum balloons for flight?
Objects which float in a fluid, such as a ship in water or a balloon in
air, do so because they are are subject to an upward force ('the
upthrust') equal to the weight of fluid displaced.
A balloon floats if its average density is less than that of the volume of
air which it displaces. Typical balloons use hot air or a light gas such
as helium to reduce their average density.
Their upthrust is equal to the weight of the air their volume displaces,
less the combined weight of the balloon skin plus the light gas they contain.
Hot air balloons work because the density of hot air is less than that of
surrounding unheated air. Balloons typically have flexible skins, although
rigid skins are also possible.
If the gas within the skin was replaced by a vacuum, the upthrust would be
at a maximum, but the skin would have to be rigid enough to withstand the
pressure of the external air without collapsing. That is the basis of the
Vacuum Balloon.
--------------------
Wow! What an idea! To build very strong, very lightweight spheres, then
suck out the air for the max vacuum and hope the size is big enough and
the weight small enough that it would 'float' in the air if not rise up to
disappear into space.
It just sounds too hard to believe but buoyancy is buoyancy!
What kind of material could be strong enough and light enough, that could
be built large enough to produce such a natural levity force?
How about the new buckyball paper material as at;
http://www.physorg.com/news7435.html
10/24/05 - Buckypaper stronger & lighter than steel
Working with a material 10 times lighter than steel - but 250 times
stronger - would be a dream come true for any engineer. If this material
also had amazing properties that made it highly conductive of heat and
electricity, it would start to sound like something out of a science
fiction novel.
"Buckypaper," has shown promise in a variety of applications, including
the development of aerospace structures, the production of more-effective
body armor and armored vehicles, and the construction of next-generation
computer displays.
Buckypaper is made from carbon nanotubes - amazingly strong fibers about
1/50,000th the diameter of a human hair that were first developed in the
early 1990s.
Buckypaper owes its name to Buckminsterfullerene, or Carbon 60 - a type of
carbon molecule whose powerful atomic bonds make it twice as hard as a diamond.
--
Jerry Decker - http://www.keelynet.com
Donations to support KeelyNet: http://www.keelynet.com/donate1.htm
Public Archive http://www.escribe.com/science/keelynet
Order out of Chaos - From an Art to a Science
