Can Drone Checks Flag Hull Corrosion at a Honolulu Shipyard?

Can a drone check a Honolulu shipyard hull for corrosion before haul-out?

For a Honolulu shipyard, a drone check is most useful on the hull a camera can actually see. That means topsides, coating surfaces above the waterline and the boot-top band near the water surface, which can be imaged and marked before a lift. It shortens the look-over you now do in the water, and it gives the crew a corrosion list that travels with the boat.

Your numbers explain why the step matters. Forty haul-outs a year works out to less than one a week, but each diver hull check takes half a day in the water, and a corrosion find that comes late can hold up a scheduled lift. A drone check does not remove the diver from the job, but it can decide which boats need a dive and where the dive should look.

The State of Hawaii Data Book counted 11,689 undocumented numbered vessels at December 31, 2016, and 9,027 of them were kept moored on land. That count covers smaller craft across the state, so it does not describe your schedule, but it shows how much land-based boat work the islands carry.

How much does late corrosion cost a shipyard?

According to AMPP, citing a 2016 NACE study, the global direct cost of corrosion is 3.4 percent of Gross World Product. AMPP projects that corrosion control practices could lower that global cost by 15 to 35 percent. Those are worldwide figures, and this guide did not locate the original 2016 NACE report, so read them as context rather than a Honolulu benchmark.

The cost that matters most to a yard is usually the indirect part. According to AMPP-linked trade coverage, indirect costs such as asset downtime and dry-docking are estimated at about twice the direct figure. A boat that sits in the yard waiting on a coating repair is exactly that kind of cost.

This is why the timing of a find matters as much as the find itself. Corrosion caught while the boat is in the water can be scheduled, quoted and fixed inside the haul-out window. Corrosion caught after the lift can push the boat back into the queue and tie up a dock slot another owner was counting on.

What can a drone actually see on a hull?

Most of the public evidence is pilot work and trade reporting, not broad validation. The US Office of Naval Research worked with a Navy ship operator on a drone corrosion-detection system. According to trade press covering that work, the drone flies around the ship and its results feed a digital model of the structure.

That shows the approach is being tested on large steel structures, but it is not a yard-ready service spec for a haul-out dock. Treat it as a signal that drone imaging is advancing, and expect your own trial to set the real results for your boats.

Waterline and below-waterline inspection is usually handled by underwater vehicles or divers, and most drone work covers above-water surfaces. The practical split is shown below.

• Topsides and coating surfaces above the waterline, which are good candidates for a drone pass
• Boot-top band at the water surface, depending on water clarity, glare and light
• Submerged hull and bottom paint, which needs a diver or an underwater vehicle
• Inside of ballast and internal tanks, which needs confined-space entry

How does Honolulu's climate affect corrosion checks and drone flights?

According to a climate table built on NOAA normals, Honolulu averages 67.9 percent relative humidity across the year, ranging from about 64 percent in August to about 73 percent in January. The same table gives an average annual temperature of 24.8 C (77 F). Its humidity figures are 1961 to 1990 NOAA data, so treat them as long-run averages rather than this season's conditions.

The table also reports about 89 days a year with at least 0.01 inch of rain, which is the number to plan drone flights around. Its annual precipitation of about 1,350 mm (about 53 inches) comes from WorldClim 1970 to 2000 normals, which is not NOAA data, so keep the sources separate in any report you share.

High humidity can keep coating surfaces damp for longer periods, so checking often rather than once is a strong case in a place like this. Build the schedule around rain days, and do not assume a clear flight window for every lift date.

What are the drone rules for a Honolulu harbor?

According to the Hawaii DOT Harbors drone operations form for commercial harbor land, a flight needs a letter of permission from the company, proof of an FAA Part 107 remote pilot certificate, and an insurance endorsement naming the State of Hawaii as additional insured. Those three items are the paperwork to finish before a pilot touches the controls.

Without an FAA-approved waiver, flights must stay within the operator's line of sight or a visual observer's line of sight. For a hull check that runs alongside a slip, that means a pilot and an observer on the dock, and a flight path both of them can keep in view.

Secondary sites disagree on state park permits and on night flying, and this guide did not verify either point against official text. Secondary sources also say Part 107 itself does not separately restrict over-water flight, which should be confirmed too. Check with DLNR and the latest Part 107 text before you commit to a schedule.

How does a drone pass fit into a haul-out schedule?

Forty haul-outs a year means the drone pass should sit inside the normal dock schedule, not beside it. The goal is that every boat reaches the travel lift with a corrosion list already marked, so the lift is never the first moment anyone looks at the hull.

Use the drone for triage. Fly every boat due for lift, rank the flagged zones, and send divers only where the drone flagged something below the surface or could not see. That keeps the diver's half day for the boats that need it, instead of spending it on boats that were clean above the water.

Keep the surveyor in charge of the decision. A drone image can clear a boat for lift only if your surveyors and coating specialists accept it as evidence, and that acceptance should be confirmed with your own insurer and classification process before you change the routine.

• Which of your forty boats are mostly visible above the waterline
• Whether the harbor letter of permission and insurance endorsement are in hand
• Whether your surveyors and insurer accept drone images as evidence
• Whether the waterline band can be seen in your dock's light and water clarity

Is the diver's half day also a safety issue?

According to NIOSH, citing BLS counts, commercial divers had 460 nonfatal injuries and illnesses with days away from work over 2011 to 2017, along with 39 fatal injuries in the same period. Those counts cover the whole trade, not Honolulu hull checks, but they show that dive time carries real risk.

Cutting the number of routine dives is therefore a safety gain as well as a schedule gain. A surface-based first look does not remove the diver, but it can reduce how many boats need a dive and how long each dive has to last. Those are the two levers a shipyard manager controls.

Keep the dive plan intact for every boat that still needs one. A drone pass is a reason to send divers to the right places, not a reason to send them less often than your own dive procedures require.

How would we scope a drone check for your yard?

We are a full-service commercial robot integrator for US businesses. We are OEM-neutral, so we choose the drone and flight plan that fit your docks, then lease it through financing, deploy and integrate it, train your staff, and service every unit under our service plan, backed by regional service engineers in the states we service. You get one partner for the whole lifecycle, not several.

The first step is a free site assessment. We map the docks and travel lift approach, the hull types you haul, the harbor permit path and the haul-out calendar. A fixed robot lease payment comes in a quote after that assessment, not before, so the number reflects your actual site.

If the assessment shows that the visible hull is most of your corrosion risk, a pilot with one drone and your existing surveyors is a sensible start. If the submerged hull or the waterline band is the bigger risk, we will say so and point you to the diver or underwater option instead.