In the 3E rules, contragrav provides just lift, but it requires
a separate thruster, see above.
This could be a walking person or a ground vehicle. Possible but
not likely.
It could be a non-vectored engine. Reactionless thruster, jet
engine, propellers, whatever. The vehicle would turn with fins
or rudders or the like, which gives very little agility at low
speed, but it is possible.
A propeller or a jet engine or a like - but would you like stand where the jet or
propeller that is capable to move (and brake ?) a 40 ton vehicle is blowing to? So what I
should have said is that grav vehicles for the mass (as personal vehicle in urban areas)
would only make sense with vectored thrust because of the desastrous side effects of jets
or propellers (that can be handled for large mass transports - see our airplanes) or the
uselessness of "frictioned" motion through pulling beasts or wheels (on a grav
vehicle!). A reactionless thruster would be an alternative, but I categorised that under
vectored thrust - even if this might not be correct from the rules.
If you have a vector thrust jet, you still have the exhaust, you can just
direct it in every direction, to move into the opposite one. That would be
a jet engine with vectored thrust
On the ohter hand a grav vehicle, that can only acceleare in one direction
and needs some sort of maneuver drives to turn would also be a consistent
concept. That would be a reactionless thruster without vectored thrust.
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