I've recently started building an ion lifter. I tried calculating the thrust the lifter produces but I came to a value that is way to high for such a small lifter. I'm using a 40kV at 1800mA AC transformer. With those values I came to a total thrust of 0.7N. Meaning the craft should be able to lift anything up to 70g. Which seems a lot especially since it struggles to lift off while it only weighs 2g. Any help on how to calculate the actual thrust? Especially since I thought that the surface area where the ionization takes place plays a factor in the calculation, but it doesn't. Help would be much appreciated!