Bjorn's notes on gyroscopic precession

Bjorn's Notes on Gyroscopic Precession

Why the 90° offset isn't where the force acts — it's where the new orbital geometry becomes visible

When you strike a free, untethered mass perpendicular to its motion, it simply finds a new resultant vector — basic vector addition. Think of two cars colliding at a crossroads: the result is a new combined direction of travel. Nothing mysterious.

A gyroscope is different because the spinning mass is tethered — held in a circular orbit by centripetal force, exactly like swinging a bucket of water overhead. The tether centre stays fixed. The tether radius stays fixed. The mass can only ever orbit that same centre point.

What happens when you apply a force

Set up the axes: the disc is spinning in the X-Z plane (a vertical disc). A force is applied at the top of the disc, perpendicular to the Z axis.

The disc now pivots around the Z axis — that's the axis perpendicular to the applied force. The mass begins scribing a new arc starting from the point where the force was applied. But because the tether centre and radius are unchanged, that new arc is part of a rotated disc, still centred on the same point.

Here is the key: the point on the disc that is 90° away from where the force was applied is the point already sitting on the horizontal plane — the X-Y plane. Because the disc is pivoting around the Z axis, that is exactly where the maximum displacement shows up. The disc appears to respond 90° away from where the force acted.

The "mystery" explained

There is no mystery. You push perpendicular to Z at the top of the disc. The disc pivots around Z. Maximum visible tilt appears at the point 90° around the disc — the point already on the horizontal. The geometry of the pivot axis produces the offset. It is Newton's laws applied to a constrained rotating system, nothing more.

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The RV Drive implication

In the RV Drive experiments with Paul, a counter-rotating disc is precessed clockwise, and the result is measurable lift — 5% of device mass, later 30% — that can be transferred to a stop as directional thrust.

The standard objection is that this violates conservation of momentum in a closed system. Bjorn's working answer: the system isn't closed in the Newtonian sense. An electric motor converts electrical energy to mechanical energy without expelling mass — and nobody calls that a Newton violation, because the motor is coupled to something external through its mounting. The RV Drive is similarly coupled: it is converting or expelling energy through a non-obvious channel, not creating it from nothing.

The experiment decides. The thrust has been measured. The mechanism is what remains to be fully understood.