The Tsumugi is a Boeing 929 jetfoil (hydrofoil) operated by Kumejima Ocean Jet. Originally the JR Kyushu Beetle serving the Hakata–Busan route, it was refurbished for Okinawa service. It carries 230 passengers at speeds up to 80 km/h using underwater wings that lift the hull above the water.
*Photos are for illustrative purposes only
“Tsumugi” (つむぎ) is the high-speed jetfoil vessel operated by Kumejima Ocean Jet on the Naha–Kumejima and Naha–Motobu routes, launching May 1, 2026. The name means “to weave” or “to connect” in Japanese, symbolizing the vessel’s mission of weaving together the islands and people of Okinawa.
Vessel Specifications
Tsumugi is a Boeing 929 jetfoil — a waterjet-propelled hydrofoil craft originally developed by Boeing in the 1970s. The vessel features underwater wings (foils) that generate lift as speed increases, raising the entire hull above the water surface at cruising speed. This “foilborne” mode dramatically reduces wave impact and allows smooth, stable travel at speeds up to 80 km/h.
| Specification | Details |
|---|---|
| Vessel Name | Tsumugi (つむぎ) |
| Type | Boeing 929 Jetfoil (Hydrofoil) |
| Capacity | 230 passengers |
| Maximum Speed | Approximately 80 km/h (43 knots) |
| Former Name | Beetle (JR Kyushu Jet Ferry) |
| Former Route | Hakata (Fukuoka) ⇔ Busan (South Korea) |
| Operator | Kumejima Ocean Jet Co., Ltd. |
From Beetle to Tsumugi: A Second Life
Before becoming Tsumugi, this vessel served as one of JR Kyushu’s “Beetle” high-speed ferries on the popular Hakata–Busan international route. The Beetle service was well-known among Japanese and Korean travelers for its speed and comfort. After the vessel was retired from the Hakata–Busan route, Kumejima Ocean Jet acquired and refurbished it for service in Okinawan waters.
Frequently Asked Questions
Q: How many passengers can Tsumugi carry?
A: Tsumugi has a capacity of 230 passengers per sailing.
Q: Is the jetfoil ride smooth?
A: Yes. Once the vessel reaches foilborne speed, the hull lifts above the water, significantly reducing the impact of waves. The ride is much smoother than conventional ferries.
Related KOJ Guides (English)
- Kumejima Ocean Jet Complete Guide — Fares, booking, timetable, boarding
- KOJ Fare Details — Pricing and comparison with other transport
- How to Book the KOJ — Step-by-step reservation guide
- KOJ Timetable & Schedule — All departure times
- How to Get to Kumejima — Airplane vs ferry vs jetfoil
- KOJ vs Flying (RAC) — Price, time and comfort compared
- Jetfoil Tsumugi Vessel Guide — Specs and onboard experience
- Kumejima 1-Night Itinerary — Hatenohama, prawns and more
- All Okinawa Ferry Routes — Complete route guide
