They say it's a 25M pound budget, and show a model about 2x the height of a person, so it looks like it may just be that single unit. The moment of inertia look

They say it's a 25M pound budget, and show a model about 2x the height of a person, so it looks like it may just be that single unit. The moment of inertia looks comparable to that of a large steam turbine.