The Propellant VEEG It is filled with air. The plastic bag in the prototype of the home It is for 12 volt computer fan It may attract air and then the plastic bag returns to its normal state. It is not that it will end the air in the space because the plastic bag will be completely closed and sealed with adhesive tape, in the case of the prototype for the home. In space, you would use a turbine several fans that compressed air so that you have more strength and push the sheet stronger or several sheets that go on air turbine that runs with an electric motor or several motors. If I am speculating on this turbine because you have to prove it in an aerospace company, but in the case of the propellant for the House I I checked it and the bag has air that will not be exhausted, but that won't be re-used all the time. In the case of space, turbine would need one greater than the atmospheric pressure to be able to compress air and is for this reason that I said on Youtube that it would need a cylinder of compressed air to fill the box where being the turbine and the sheets. I hope to have explained the case of my space propellant and propellant of the House who refuted Newton's third law and turns it into a propellant that does not need fuel because it will always use the same air repeatedly. The air is always there inside. In the two cases. Very affectionately, Victor Elias Espinoza Guedez