how fast?

[chowdan]

Hi guys.

haven't been on this forum in a very long time.

I have a few questions. If you took a disc, say 3ft in diameter(random size i picked), how would you calculate how fast the disc had to rotate before it would have enough force to lift it off the ground?

What would the calculation be and how does one figure out the calculation?

After thinking about all these circular shaped "ufos", i thought, what if they are just spining so god damn fast to keep themselves in the air? Granted im sure most of you have seen only videos that contained "lights" or photos of these "ufos". But how do we know they aren't actually spinning?

I imagined a aircraft that is a disc shape, but yet, the structure of the craft was similar to a bicycle wheel. If you take a bicycle wheel and stick a rod through the center(where it mounts on the bike) you are able to spin the wheel while the rod is stationary. What if we took this idea/concept and applied it towards a flying vehicle? The outer section of the disk shaped craft could be spinning while the center of the craft would be stationary (although being on the inside of a craft spinning at such speeds might be kind of interesting way to commit suicide).

Would this be a possible design? Has anyone ever attempted such designs on model or full scale?

I'm open to hear what people have to say, so let your ideas loose!

[cristache]

Why it would lift if you spin it?
Hmm..
Let's say you have a ring 1 meter diameter (little more than 3 feet) for calculation simplicity
Let's say if you spin that ring fast enough the linear speed of the ring will be so high that the centrifugal force relative to earth center will exceed gravity.
Let's assume it will work
then we need 2mv^2/d >= mg (that is centrifugal force bigger than gravity pull)
simplified:
2v^2/d > g
or v > sqrt(gd/2) - (that's square root)
where:
v - rim velocity in meter/sec
d - earth diameter in meter (12,715,430)
g - gravitational constant, aprox 10m/sec^2
v should be greater than 7,973 meters/second (that's almost 5 miles per second)
give the ring diameter of 1 meter that would translate into
rotations per second = v / (pi d) = 2,539
or in rpm 152,340
Let's say you can spin something that fast (thinking here a toroid instead of ring with mercury plasma confined in magnetic field)
for a mass of 1 kg of plasma spinning that fast around 1 m diameter torus the centrifugal force is
m v^2 / r = 1 kg x 7,973 x 7,973 / 0.5 = 127,137,458 N.
That is 12.7 tons of force (28 million pounds force). What material can resist this pressure?
Or how much energy you need to put in the confining magnetic field to maintain the plasma inside?

[cristache]

So if you have a 10 meter diameter ufo the force reduces to 1.27 tons.
Now it depends on the surface that 1 Kg is pushing.
assuming 100 square centimeters (4" x 4" aprox) and let's say A36 steel with yield strength of 250 MPa (mega Pascal, 1 Pascal = 0.1 Kg/square meter
The calculated pressure is
1,270 Kg / 0.1 (100 square centimeters in square meters) = 12 MPa which is under A36 steel capability so yes it will work
Question is how do you spin it that fast. I mean you realize cannot be something mechanical at 10 meter diameter.
A jet engine might spin 30,000 rpm and diameter is way smaller and you need 150,000 rpm

[Neo-X]

It is possible to lift a metal disc by spinning it extremely fast but it would need lots of energy because of friction. A real ufo doesnt have a spinning disc but instead a super magnetic fluid which has zero friction so that it can rotate extremely fast in a enclosed donut container thats why ufo has a dics shape. But the question is how can a ufo make a side way propulsion? How can it make sharp turn? How can it cancel the effect of inertia? How can it fly without friction? Why it doesnt make a sonic boom? How they can travel extremely fast unaffected by solar flare, space dust particle and small rocks.

[cristache]

If they do they should have 2 spinning masses, or whatever, in opposite directions, both creating a counter centrifugal force against earth center.
But I'm more in the favor of manipulating electro-magnetic fields.
Whittaker (http://www.rexresearch.com/whittakr/whittakr.htm) makes a demonstration which tells the laplace equation driven phenomena (electrostatic law and gravitation law) can be created by longitudinal standing waves.
Tesla was mentioning a spacecraft with a high DC voltage on the upper shell and high frequency high voltage on the lower shell will create propulsion
Tesla was saying the high frequency, HV on the lower shell will "rigidify" the aether - that sounds to work hand in hand with Whittaker longitudinal waves
Also the HV DC on the upper shell might destroy the longitudinal vibrations due to biasing them.
Paulo and Alexandra Correa have a patent where from a small tesla coil a wire from the secondary capacitor begin connected to a small sheet of gold, reduced the sheet weight.
There was an experimental numerical calculation with a sphere in a medium where there were a lot of oscillators of different frequencies. The end result was a pressure on the sphere, much like we feel the gravity but we say it's a pull. I strongly believe is a push from outside based on all the above.
Why nobody could measure a very sensitive pendulum displacement next to a big mountain (big mass) to prove Newton theory?
Besides newton gives a measure to the force but no explanation.
Einstein space-time curvature is a non-sense. What a heck is space-time. That's a convention in calculus, a metric we measure something (x,y,x,time)