Based on Eric Laithwaite's experiments, and specifically the ones illustrating that there is no centrifugal forces on the axis of precession, I can say that it is a no brainer to design an inertial propulsion device.
See my simple design below. What do you think? I rotate the arm with a motor perhaps, and at the 9 o'clock position I spin up the gyro, so that it does not produce a centrifugal force on the axle, then at 3 o'clock I remove the kinetic energy from the gyro and stop it so that it will produce a centrifugal force on the axle. Therefore, the axle will be pulled in only one direction.
How much simpler can it get?
EM
PS. Note that the gyro will want to torque out of plane when it is rotated from 9 o'clock to 3 o'clock, because it is spinning, however, if it can't do that because it is constrained, the constraint will produce the necessary torque on it to keep it in plane, so it should work. However, it might not and need to be oriented only horizontaly, and have gravity cause the precession. That's an experiment that needs to be performed.
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