[extropy-chat] Relativity drive: the end of wings and wheels?

[ps udoname]

"Shawyer cautions that the calculations only work for static thrusts.
'You can't beat the laws of physics. If it is used to accelerate, the Q
value drops. It is best used to lift a body and oppose a force, for
instance to counteract gravity. It cannot be used to accelerate further.'"

What if it opposes gravity, and then another force is used to accelerate it?
Does the Q value drop then?

Also this does not make it clear whether using the drive to accelerate is
impossible or just impracticle.
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