a two-ship cruise fleet serviced from Gulf Coast and Florida ports
Hull Robots on a Two Cruise Ship Fleet Cover 90% of Wetted Hull Per Round
A two cruise ship fleet serviced from Gulf Coast and Florida ports ran hull robots that covered about 90 percent of wetted hull per round and cut fuel use.
- 90%
- of wetted hull area covered in each cleaning round
- 2 MW
- average drop in propulsion power on the larger ship
- 320 t
- metric tons of fuel saved by the smaller ship by month seven
- 19
- port calls covered during seven months of proactive grooming
Based on a documented real-world deployment. Figures are from public reporting; the organization is not named.
Fouling that costs fuel long before anyone sees it
Biofouling is a quiet tax on a cruise ship. A fouled hull can raise fuel consumption by 10 to 30 percent, and a ship carrying heavy growth may need 25 to 30 percent more propulsion power to hold its speed. On a schedule sold months ahead, that loss rarely shows up on a passage plan. It shows up in the fuel bill.
Dry docking clears a hull, but it also takes a ship off its itinerary. Ports have grown cautious about in water cleaning, since dislodged growth can release biofouling material into harbor water, and efficiency rules such as the IMO Carbon Intensity Indicator have made owners watch hull condition more closely. The fleet needed a way to keep hulls clean between port calls rather than during them.
The two ships in this study were not in the same condition. The larger vessel, carrying about 4,000 passengers and 1,500 crew, arrived with significant fouling. The slightly smaller ship, carrying about 3,000 passengers, needed steady upkeep more than rescue.
- Fouling raises fuel burn and the propulsion power a ship needs
- Dry docking pulls a ship out of service
- Some ports are wary of in water cleaning because of released growth
- Large cruise hulls carry 8,000 to 10,000 square meters of wetted surface
Robots sized to the hull and a steady grooming rhythm
The fleet's cleaning program began with the arithmetic of the hull. The robot swath is about 0.7 meters, and typical production runs near 540 square meters per hour, so a large cruise hull of 8,000 to 10,000 square meters had to be groomed over several port calls instead of in a single visit. Planning followed the port schedule, not the other way round.
Each round aimed to cover roughly 90 percent of the wetted surface. On the larger ship, the first round was a catch up job. On the smaller ship, the program was proactive from the start, with cleanings typically two to three times a month across seven months and 19 port calls. Regular rounds kept the hull from building up to the level the larger ship had reached.
- Survey fouling on each hull and measure the wetted surface area
- Plan each round around the port calls on the itinerary
- Target about 90 percent of wetted surface in every round
- Groom proactively on the smaller ship, typically two to three rounds a month
- Record propulsion power and fuel use so each round can be compared with the last
Measured gains in power, fuel and carbon
On the larger vessel, the average propulsion power requirement fell by about 2 megawatts after service. Over 90 days, the ship saved about 80 metric tons of fuel, and the study estimates a reduction of 256 metric tons of CO2.
On the smaller vessel, propulsion performance improved by nearly 20 percent by month seven of proactive grooming. Cumulative fuel savings reached 320 metric tons, and the reported carbon reduction passed 1,000 metric tons.
These numbers come from a study that does not name its funder, and the write up is vendor linked, so they should be read as the reported view of the operator and supplier rather than as independently confirmed results. The direction of the gains is consistent across both ships, but the exact figures carry that caveat.
What a robot integrator takes from a hull program
Service Robot Co. is an OEM neutral commercial robot integrator for US businesses. We do not clean hulls, and nothing in this case suggests we run hull work. The planning habits here still carry over to any fleet or facility that wants robots without pulling assets out of service.
Our work starts with a site assessment and mapping, then covers robot selection across manufacturers, deployment and integration, operator training and service through a nationwide US engineer network. Customers take a robot on a three year lease with one fixed payment quoted after that assessment, so the cost line is settled before the first unit runs.
Operators weighing options will find several designs. As of October 2026, Jotun's HullSkater was in a pilot on Carnival Pride, Neptune Robotics has described cavitation jet robots that work in turbid water and at night, Fleet Robotics builds untethered robots with magnetic feet, and SeaRobotics offers partly autonomous brush systems for early grooming. Each fits a different job, and sorting among them is the selection work a vendor neutral robot integrator does.