Editing Joshua Pawlicki's Explanation of How It Works (section)

===''Gravity Drive''===
The gravity drive is the principle thing that makes the ship run. In addition to simulating the artificial gravity on the ship, it creates the pressure necessary to create the fusion reaction (see Fusion Reactor). This also sucks a huge amount of power, understandably. The gravity drive can be used to create the three assumptions (see Reference Tables), and is the key part of the ship. Without it, the fusion reactor will shut off, and that results in losing all power, air ventilation, and further systems. It is extremely difficult to repair, and almost impossible to cold start without a jump from another ship (most ships carry extra power cells that they can use to power it just in case: invest in these). The device works off the basic concept that quantum gravitation (gravity between atoms) is based on magnetic polarities. The hull of the ship is lined with electromagnets that, given sufficient power, can create an artificial gravitational field within and on the surface of the hull of the ship. The "gravity drive" in the sense that most people think of it is only a single major component of the entire drive (which is spread throughout the ship). This part is known as the gravity drive hub, and is typically seated nearby the fusion generator. It's primary purpose is to complete the complex mathematical calculations required to determine the pulses of energy that should be sent to each of the electromagnets throughout the ship. In theory, it can be engineered and modified to allow complete manual control of the gravitational fields in the ship, but most devices do not support this feature by default (for obvious security reasons). The largest electromagnet in the entire ship is attached to the pulse drive for the purposes of very fast travel, which uses inertia reduction to increase the local of objects. Look up Superstring Theory and Quantum Gravity for more.
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To reduce the need for power and required size of the fusion reactor, the fusion reactor's electromagnet is the only one that is constantly on. The rest of the electromagnets (those set in the hull that make you walk, not float, for example) are only on about 1/4th of the time (depending, as always, on design). The magnets turn on for a duration of 250 microseconds, then off for a duration of 750 microseconds. The pulse effect is similar enough to real gravity to fool any living being into thinking that it is constant, while only using 1/4th of the required power. Newtech systems have managed to get this into even smaller ratios, and average about 1/8th to 1/12th on time. The current record of minimal power consumption in the 'Verse while maintaining 1G is 1/45th in controlled lab conditions. In atmospheric flight, the ratio usually normalizes more, going to ½ the time or 2/3rds on time to allow upside down flight and so forth when another gravitational factor is an issue.
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As the gravity drive relies on electromagnetic waves, EM radiation becomes a huge issue. Most hulls have radiation shielding plated within them. Those that don't are short-range only and rarely have a pulse engine. Most of the radiation is in the exhausts of a ship, and enough of it is at a high enough frequency to completely strip an atom of electrons instantaneous. While flying in another ship's exhaust is a good way to remain hidden from heat sensing, it will slowly decay your hull, and eventually reduce your boat to a cloud of subatomic particles. How long a hull can hold out against this radiation depends on how much rad-shielding it has and design. A normal radiation suit or vac suit will not hold out long against this level of concentrated radiation, and shuttles, having much weaker hulls than boats, can't sit in there for long either. On the other hand, the radiation is a very good way to destroy the exhaust of a ship and not leave helium gas everywhere where you've been (which would be pretty easy to track with a decent computer).
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