There is no comprehension as to the nature of helium lifted vehicles nor the volumes required for effective lift.

Dear Sir, When talk about the balloon filled with helium gas the observations are as follows. Therefore a suitable solution of power energy as to which gas would be better for lifting the disc and control vertically and horizontally may be studied to enable develop the idea. The lifting ability of a helium (a low density gas) filled balloon is related to the volume of (higher density) air displaced by the balloon -- the larger the amount displaced, the greater the lift. This is true for any gas whose density is less than that of air. That is why balloons filled with hot air can float in air. A balloon you blow up with your lung power contains much cooler air. Thus, it cannot float in air.

Yes, the helium-filled balloon does lose lifting capacity when it shrinks.

Here is why: Other things equal, the volume of an ideal gas is inversely proportional to its pressure. If the pressure on the gas is increased, the volume of the gas decreases. Also, the volume of the gas is directly proportional to the absolute temperature. If you heat the gas, it expands; if you cool it, its volume decreases.

Heating the balloon makes the helium atoms move faster. The force of their collisions with the wall of the balloon increases. The increased force, is an increase in pressure which, in turn, stretches the rubber and makes the balloon expand. Cooling does the opposite. When the balloon cools, the pressure inside drops, then the elasticity of the rubber shrinks the internal volume, and the overall volume of the balloon gets smaller. As a result, it displaces less air and therefore loses some of its lifting capacity

Dr V Kumar

You seem to comprehend the buoyancy principle which gives a lighter than air balloon its lift so I wonder why you conceive that the relatively insignificant volume within a disk platform should supply it with sufficient lift to carry passengers plus the weight of the structure.

Even assuming you could use some principle to make a disc fly--looking like some kind of spaceman from a 50's movie--why would you ever want to fly 3 feet from the ground? As a model pilot, I'm of the belief that the ground is the enemy. If you're too close, you're more likely to hit it. Sidewalks would be scary to walk on if discs were zooming by at chest-height. Cars could take 'em out too.

Hi, Sir, with 3ft on near the doorsteps, would be easier to climb. Once boarded, the disc can be manovered vertically to certain safer height from ground level as also above the electric posts and shall travel horizontally. The disc can land even on top of house with her landing gear subject to the area. Only thing specifically is the suitable power to drive and lift the disc - what sort of the prime mover can be utilised for this.. is to be assessed to make it viable. Best Regards Dr V Kumar

Aside from the many problems of what is essentially a super skate board the prime mover which is a compact power source capable of lifting and moving the proposed device is not a minor problem but the essential element that might make the project even faintly feasible. It does not exist.