Underway Stabilization: Comfort While Cruising

Underway stabilization simply means roll damping while cruising. It is the capability owners use most hours of the year, on every crossing, every coastal leg and every windy afternoon home. So it is where a stabilizer earns its keep or does not.

RotorSwing's 100% electric rotor systems deliver powerful underway roll damping from just 3 knots, the speed range where displacement motor yachts spend most of their time.

Working from 3 knots up

Many stabilization approaches only become effective at higher speeds. Displacement yachts live at lower ones. RotorSwing rotors close that gap: powerful roll damping starts at just 3 knots, because the spinning rotor creates its own pressure difference rather than depending on speed alone. The full mechanism lives on its own page: the rotor principle in detail.

At the top of the range, the patented Adaptive Rake function automatically angles the rotors to reduce drag and power consumption, keeping maximum stability up to 16 knots without retraction or loss of speed.

insert graphic [diagram]

the spinning rotor creates its own pressure difference

Nothing else changes about how the yacht sails

A stabilizer should remove movement, not add complications. Underway, that means three things:

No steering effect. The system maintains a perfectly straight course, without introducing unwanted steering forces.
Fully retractable. Zero drag when the system is off, and safe docking in marinas.
Fuel efficient. The Rake function reduces fuel consumption at higher cruising speeds.

A motor yacht under way alone on open blue water under a clear sky, holding a straight line

And because the rotors work in the open water under the hull, stabilizing force is available against waves from any direction, including the wake and following seas that arrive from astern.

What that looks like after 620 hours

A dark-hulled motor yacht lying in a mirror-calm Norwegian fjord below snow-covered peaks and a glacier

MY VRYBURG · 620 hours logged

The endurance reference in the fleet is VRYBURG, an RS 140 Underway installation with 620 hours logged on the open North Sea, from Holland to Norway and back.

A dark-hulled Dutch motor yacht named Ursus driving through a short, breaking sea under a grey sky

MY Ursus · Smelne 1295

And sometimes the proof is smaller and closer to home. On MY Ursus, a Smelne 1295:

“If a ship comes up behind or toward us with a meter-high wake, the coffee cups normally fly through the saloon. If we now switch on the RotorSwing twenty seconds in advance, the sideways rolling is completely eliminated.”
van den Haak, MY Ursus

More stories from the water: owners who cruise the North Sea.

Underway now, ZeroSpeed at anchor

Underway is one of two configurations across the rotor range. Owners who also want stabilization after the anchor goes down choose Underway + ZeroSpeed; how ZeroSpeed works at rest explains how the rotors continue to stabilize the yacht with no forward motion. How the two configurations map to the individual systems is easiest to see side by side: compare Underway configurations. Both belong to every technology in the platform.

For the day-to-day experience on a long leg, lunches on the aft deck and crossings included, see stability on a long passage.

If most of your hours are made underway, your stabilizer choice starts with your cruising speed and hull. Tell us both and a RotorSwing engineer will point you to the right configuration, honestly.

Find the Right Stabilizer