In the picture there is fully closed gravitational machine.
- Machine has pressure shields in all around low gravitation lifter tube.
- Then it has ports, that limits entrance to low gravitation tube.
- Possible that machine needs holes at the top for leaking the flow pressure out from the tube.

Gravitation seems to work so, that
- pressure reduces the drag and increases rotation.
- thick solid material reduces drag and slows down rotation.
- pre estimation is that pressurized liquid would be more efficient than gas.

Conversion from drag to rotation with pressure is obviously more efficient way to build shields, than thick material.

Gravitational drag in rotational field could be created with increased macro level pressure and by increasing the density of the atom mesh.
If so, gravitational drag is born almost automatically, when you a build spacecraft or space construction with oxygen and ventilation.

Gravitational power plant can be used as primary power plant. It produces the same power all day and year long.

Gravitational and rotational machine is different from the others in efficiency. As long as the low gravitation tube or silo drops the weigh more than the move in and out takes, everything is okay. You can build as many silo systems as you wish, you can also run the system as many times per minute as you wish.

Calculations

Calculations are based on high gravity and low gravity tubes G constants. In unshielded high gravity tube G is 9,81.
Average speed in shorter un-shielded drop tube is G/2. In long tube air resistance slows down the speed.

If you have 10 meter silo and 1 000 kg weighs. If the silo drops the weight to 800 kg, and move side ways takes 1 000 N, system works.
- You need 10 meter * 800 kg * 9,81 m/s = 78 480N + 1 000N = 79 840N.
- With a drop you get 98 100 N and the surplus per round is 19 620N.

A 10m tube rotates once in 2 seconds, when so
- vehicle power is around 10 kW
- electric power for one tube is 3600 * 10 kW = 36 MWh.
- 1 GWh nuclear radiator replacement needs 30 tubes and 30m x 30 m² building for the plant.

If you build a low gravity elevator into house, you might also want to build a gravitational power plant into the building. 

When you look at the R&D fees, you should keep in mind, that without R&D power solutions you would be short on power and soon also out of oil and everything else.

Functionality

There is a small chance, that flow-pressure is steady. 
But in principle force that initiates rotation must have direction.
In order to have a direction force must move. 

Since we are talking about brand new thing, that goes below macro level,
macro level physics is not necessarily valid at flow level.

5th October 2019 : According to unconfirmed rumors, shields and machine are already confirmed to functional and possible...

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Besides space crafts, the gravitational machine could be used for powering big and high ships.
You need the gravitational and rotational machines soon after Mars. After Mars it doesn't take long after sunbeam power falls into marginal levels. It is important to check how warm planets cores are after solar power dies. Cores can be or rather should be hot like hell, after solar power falls into insignificant levels.
Space traveling and exploration needs also special version from electromagnetic battery. Battery that works in very low and very high temperatures. In the space you always travel in direct sunlight. Probe that examines sun and stars needs space lift tech. 

The artificial gravity you planned for space hotel can turn out to be a natural gravity.
According to current estimations, when you add pressure and atom density, it can result into a conversion from rotation to gravity. If such happens, the floors in space hotel are always closest to earth. When you leave earth's rotational field, the floors are closest to sun.  
And in interstellar space, floors are closest to Sagittarius A or the rotation center of our universe.

Are we ready for the first intergalactic crusade ?
Designs are ready, machines are missing.
We know that it possible to enter interstellar space and that communications work.

How fast you can travel in space ?
There is sound barrier like flow barrier. In principle it is possible to travel faster than flow. But it is not necessarily as easy as breaking the sound barrier.

In crust cooler holes gravity grows with depth. With proper cooling, you dig tunnels through earth, and go near the core and center.
A tunnel that goes below crust is dangerous. It collapses easily. A tunnel network disturbs gravitation and rotation. Gravitation inside the crust is so big, that you cannot get any advantage from the tunnel network.

 

Might be possible to build machine with one tube. Move the shields sideways instead of pistons.

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System where you pressurize the shields is obviously inefficient, possible that you need more energy to pressure creation than you get with the machine.

Can use such adjustable system in every where else but in energy creation and power plants.

The new gravitational machine will become of the R&D power solutions ?
Obviously. Got the shield system forwarded to first functional machine as part of the geo-historical split research. Fields got also something new from that spare time research.

You had no idea where that research would end ?
No. On ground pressurized, "Jack in the Pot" machine is simple, easy to build. Getting the existing drag force out of the box is a small problem. 
And it should work ?
Currently nothing points to a thing, that it wouldn't. If it doesn't you have to wait till the day, Finns and their co-ops are willing to let me move away freely ... happily and healthy.
We all hope, that this day will come soon.

You will not ask cancellation to that official declaration from being an unwanted person in USA ?
To a natural born control freak, who is obsessed with lust of power, such request is a green card to the companies Boys Sponsors own. Cannot remember many exceptions to the rule.

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You cannot replace gravitational system with helium or hydrogen ?
No. Helium and hydrogen have low gravitational resistance. If you build a gravitational machine with helium, the gas exchange should take more energy than you can get from the drop. This comes the general laws of physics. Gravitational shield changes the base factor of the physical laws, shield reduces the mass of all over lying or enclosed objects.

If you build 100% shield, it doesn't explode our bodies.
Full shield neutralizes gravity. The space behind shield matches rotational space. When you construct the shields you are never allowed to break the protons and electrons. Broken proton or electron creates lethal anomalies into our universe. Areas where the gravitational forces and flows are not like they should. Areas have also dead atoms. Atoms, which does not rotate.

The gravitational drag is a pressure.
Yes. Drag comes from under-over pressure system, that affects to atoms. Drag pressure is not exactly the same than our measured pressure. It is an underlying pressure, that empowers our pressures. Most from our pressures come from atom mesh.

Plane's wing is an example from the system, that has gravitational shield in it. Overpressure under the wing blocks and reduces the gravitational drag. Space in between cars bottom plate and road ... catarman's body and water ... has also a drag shield system. The lift must always come from atom level pressure. Shield itself never raises anything.

Besides theme parks and elevators, you can use first shields in easy-to-climb staircases and ramps.
In principle you might be capable of using the shields in boxes and cars for heavy things. Moving things has to carry shields weight, too. The benefit from reduced weight of cargo, can go to weight of the shield system. By the time you are almost certain to find ways to reduce the mass of the shields.

Have a hunch that oil based shields would be the best. Oil is liquid or solid form of pure energy. When so, oil could also have the best capability to absorb and reject energy. Oil is also a safe way to build the shields. But the time will show.

There are many things, where you can use the heavier first generation shields.
Low gravitation arm chairs, sofas and beds are obviously much more comfortable and relaxing than the common pieces. Low gravitation furniture should speed up your atoms and make you feel better. 

Low gravitation furniture reduces most pains in the body, when so, dogs and drug companies obviously wants high gravitation beds and furniture, things that will maximize their provisions and profits.
You forgot to enlist politics and other control freaks ... from the supporters of the high gravity furniture.
Wonder with what kind of "scientifically-proved-to-be-true" lies they will come to publicity, this time ?
No idea.  Cannot blame these people from the lack of imagination.