LAUNCH, BOOST, CORRECT, CONVERGE

Four phases, and only the first is shared with Goose. Shop air fires the round from rest to an exit speed of ~74 m/s (~268 km/h) — slower than Goose's ~189 m/s, because a heavier round drawing on the same delivered energy leaves the tube at lower velocity. That trade is the whole design: everything downstream of the muzzle depends on it.

Clear of the tube, a folded propeller deploys from the tail and the sustain motor spins up — a ~1 kW-class electric drive holding the round at cruise for the length of the engagement, so drag is paid by the motor instead of bleeding off as ballistic decay. Four adjustable trim fins provide baseline steering, but at this speed they carry a fraction of the authority they would on a faster round. The 4-axis bow-thruster ring is what actually chases the turn: four motor/fan units at the nose apply pitch, yaw, roll and trim thrust independent of airspeed, cued down the trailing optical fibre by an operator in the loop. Where the target was is not where the round is aimed; where the target is now, is.

The arithmetic is why the family splits into two rounds. On a shared-energy launcher, exit velocity falls with the square root of mass, and sustain power falls roughly with the cube of velocity — powering Goose's 1.6 kg, ~189 m/s round would demand ~12.5 kW and a battery heavier than the round itself, while Gyrfalcon's 13 kg, ~74 m/s round needs ~0.97 kW and a ~0.6 kg pack, under five percent of the round. The same trade buys the family's gentlest launch — ~94 g average over the stroke, against the ~600 g Goose is built to survive — so the electronics-rich round gets the softest ride, on purpose. The margin left in the mission energy budget also carries a sized dash option: roughly +20 m/s above cruise for ~37 kJ of electrical energy, about double the instantaneous draw — a design option, not the baseline flight profile.