Why Some Yachts Don't Roll: Stabilisers, Explained
Direct answer
Stabilisers stop a yacht rolling. Fin stabilisers work underway; zero-speed fins and gyros (Seakeeper) work at anchor — the one that matters for an Ibiza lunch stop. If anyone in the party is prone to seasickness, ask which system the boat has before you book.
Skip ahead — the office handles the rest
Almost every complaint about a charter day traces back to one thing nobody asked about: roll. A yacht sitting beam-on to a swell rocks side to side, and a boat that rocks through a two-hour anchored lunch can turn a beautiful day grey for anyone with a sensitive stomach. Stabilisers are the engineering answer, and not every hull has the kind that matters.
The three systems
| System | Works when | What it means for you |
|---|---|---|
| Fin (active) | Underway | Smooth cruise; does little at anchor unless zero-speed rated |
| Zero-speed fins | At anchor + underway | The gold standard — flat lunches in real swell |
| Gyro (Seakeeper) | At anchor + underway | A spinning flywheel; superb on sport boats and dayboats |
Why "at anchor" is the whole game
An Ibiza charter is mostly stationary. You run twenty minutes to an anchorage, then sit for hours — swimming, eating, doing nothing in particular. That is exactly the moment a plain fin-stabilised yacht still rolls and a zero-speed or gyro system holds the deck flat. On the sport boats the Seakeeper gyro on Vibe does the same job a fin can't; on the larger hulls, Lady KC carries zero-speed stabilisation that earns its keep in an August afternoon breeze.
What to ask before you book
- Does the boat stabilise at anchor, not just underway?
- Is it a zero-speed fin system or a gyro?
- For a sensitive group, this question outranks top speed.
Office note
If you tell the office someone in the party gets seasick, we steer you to a stabilised hull and a sheltered anchorage by default — and brief the captain to pick the calm side of the island for the day. It is the cheapest upgrade to a charter there is: a question.
People also ask
Frequently asked
- Do all charter yachts have stabilisers?
- No. Most larger motor yachts have at least underway fin stabilisers, but only some carry zero-speed or gyro systems that also work at anchor. Smaller dayboats often have none, or a Seakeeper gyro retrofit. Always confirm before booking if comfort at anchor matters.
- What is a Seakeeper?
- A Seakeeper is a gyroscopic stabiliser — a fast-spinning flywheel in a sealed sphere that counteracts roll. It works both underway and at anchor and is common on sport yachts and dayboats where fin stabilisers are impractical.
The Office
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