Design
Governing model
Receptors
Output

The shot

Hole geometry and charging. Every flyrock model reads from these six numbers and nothing else.
The single strongest driver in two of the three models.
Drilled burden, not designed burden, if you have face survey.
Measured collar to top of charge. Short stemming is the usual cause.
Cup density in the hole, not the datasheet density of the product in the truck.
Direction the free face looks. Face burst throws this way.

Three models, three answers

Published flyrock models disagree by large factors. All three are shown because choosing one quietly is not defensible.
Applied to every model's predicted distance.
Site constant. It is the single biggest lever in the model — the published bounds of 13.5 and 27 differ by a factor of four in distance.
Near-vertical ejection lands short. Shallow ejection carries.

Scaled depth of burial

The confinement of the top of the charge. It is what decides whether the collar region vents or works.

Ballistic envelope

The Chernigovskii locus: the highest a fragment launched at this speed can be at each distance. Nothing under the curve is out of reach.

Launch angle

Range against launch angle at each model's velocity. In a vacuum 45° is the maximum; landing below the launch point moves it down.

The wall below

Every flyrock model gives a range on flat ground. A shot on a crest is not on flat ground — it throws down a wall, and a catch berm only catches what lands on it.
Face angle of the benches below the shot.
Catch berm between benches, measured horizontally.
Distance from the crest back to the hole being considered. Zero is the front row.

Plan

The drawing that goes on the gate. Pattern, the three exclusion radii, and everything that has to be clear of them.

Receptors

Everything that has to be outside the zone: people, plant, roads, powerlines, structures.