"Antigravity" Method 14 of 15 Sonic -Ultrasonic Acoustic Group V Filmed 1991-1996, 14 of 15 methods of levitating an object known to the author John Iwaszko, edited from the video Antigravity the reality made in 1996. The "antigravity" method shown in this edit, was introduced and was referred to as Levitation on sound which has now been reclassified by the author as, Sonic Ultrasonic Acoustic (Method 14) As with all systems there are many technical ways to achieve levitation of the various methods I have classified it is beyond the scope of this presentation to show all of them. Method 14 Acoustic levitation will show a small variety of methods for suspending matter in a medium by using acoustic radiation pressure from sound and ultrasonic sound waves. The first and the simplest method I discovered in 1991 involved sound waves to generate a vortex of air from the output of an 100W piezo electric horn tweeter (driven with a 100W amplifier and oscillator) where the aperture of the output cone was reduced to a small hole of approximately 1 mm in diameter centred within a sealed cap over the horn. The maximum air disturbance is at the peak fundamental frequency of the tweeter employed as this generates the greatest amount of air and acoustic pressure waves. The little foam ball oscillates and gyrates wildly at the peak frequency. Based on the size and geometry of the object, with careful frequency and waveform adjustment a relatively stable levitation can be achieved, therefore levitation height, rotation and oscillation can also be controlled by the frequency, waveform as well as volume, this allows a very simple manipulation of solids and liquids or even separation without any physical contact, as the materials selected via simple control will levitate in the air. This type of Aerodynamic levitation can also used in combination with acoustic control where it is used to concentrate a flow of gas or air along an axis upwardly against the object to provide a force to lift, the majority weight of the object, and acoustic levitation means which I will describe next for exerting an acoustic positioning force on an object to restrain movement away from the axis and to hold the levitated object in a selected position. This form of levitation is a hybrid and another example of combining two classified methods, to describe it more accurately is method 14 sonic ultrasonic, acoustic group V and method 16 group VII Aerodynamic levitation which will be described. WARNING:- Some of these experiments operate directly from 240VAC mains supply or far higher voltages at high currents are potentially lethal. Do not build unless you know exactly what you are doing. Do not touch any part of the equipment while it is plugged into a mains outlet. And remember that the methods described do not conform to any electrical safety standard and many of the experiments performed are downright dangerous. Powerful magnets such as neodymium magnets or powerful magnetic fields generated by coils can be dangerous and not to be played with. Powerful magnets or magnetic fields can crush fingers. The power of magnetism can also cause chunks of metal to take flight and cause injury to body parts and or blindness. Rotating machinery can pose a danger from rotating or reciprocating parts. Particularly when machine parts move toward each other, or one part moves past another, which can crush limbs. Extremely intense sounds can burst ear drums or can be physically painful to human ears. High-intensity ultrasound waves are extremely dangerous to experiment with as they can heat human eyes or other tissue by absorbing ultrasound energy which becomes heat by vibration and corresponding energy loss. Exposure to radio frequency energy or ionizing radiation that can be generated by coils can not only burn as they get hot but also cause radiation burns, damage to the skin or other biological tissue. Direct skin contact with liquid nitrogen will cause severe frostbite (cryogenic or cold burns). This may happen almost instantly on contact, there is always a potential hazard when handling liquid nitrogen. Be careful! Use good solid judgement in your work, and think ahead. I John Iwaszko do not endorse the experiments shown, and am merely passing on information, I have learnt through experiment. Safety is your responsibility!

• published: 20 Aug 2009
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