Propeller Polishing at Mindelo Port
Mirror finish, measurably lower fuel burn
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Tell us the vessel, the port and the window. Scoped reply, usually the same working day.
Cleanship Marine carries out underwater propeller super polishing at Mindelo Port, São Vicente. Divers work the blades through a multi-stage sequence to a Class A mirror finish, removing fouling, calcareous deposits and accumulated surface roughness while the vessel lies alongside or at anchor.
The propeller is the highest-leverage surface on any vessel calling at Mindelo: it runs at high relative velocity, so roughness there costs disproportionately more than the same roughness spread over the hull. For the transatlantic vessels calling for bunkers, cruise ships and feeder container ships working this port, polishing is the shortest route to a measurable fuel saving.
A ship leaving Mindelo after bunkering is usually starting a long ocean leg — to South America, to Europe or down the African coast. That is the passage where propeller efficiency matters most, and a polish done in the bay during the bunker call is working for every mile of it. The sheltered crater water makes Mindelo a comfortable place for divers to take a propeller to a full Class A finish rather than a rushed partial job.
What it gets you
- Blade roughness removed where it costs the most, at the highest-velocity surface on the vessel
- Propeller efficiency restored between dockings without off-hire
- Cavitation erosion and edge damage documented before it becomes a repair item
- A finish record that supports hull and propeller performance monitoring
Working conditions at Mindelo
Porto Grande is a bay formed in an old, drowned volcanic crater, which is what makes it the deepest and best-sheltered natural harbour in the archipelago. Inside the bay the water is calm and — away from the working quays — clear. The exposure is in the approaches: the channel between São Vicente and Santo Antão funnels the north-east trade wind and can run a rough sea when the trades are strong, so launches and dive support are planned against the wind as well as the berth.
- Where we work
- Commercial quays of Porto Grande · Mindelo cruise terminal · Bunkering anchorage in the bay · Fishing port
- Vessels we see here
- Transatlantic vessels calling for bunkers · Cruise ships · Feeder container ships · Fishing vessels · Inter-island ferries
What we do at Mindelo
- Blade condition assessment covering both faces, the leading and trailing edges and the tips
- Multi-stage polishing sequence worked down to a Class A mirror finish
- Boss, hub and fairing cone cleaned, with rope guard and seal area inspected
- Edge damage, cavitation erosion and any deformation photographed and reported rather than polished over
- Diving permission cleared with ENAPOR – Portos de Cabo Verde, and the shaft confirmed immobilised with the master before the dive
- Before-and-after video and a written finish record for the performance file
Planning the window at Mindelo
The trade-wind and swell season governs the calendar at Mindelo Port, with the strongest trade winds from roughly December to May, and a short rainy season from August to October. The islands sit in open ocean, so a port's exposure depends on which side of its island it faces: the lee-side harbours stay calm while the trade wind blows, but long-period swell from North Atlantic storms reaches the north and west coasts in winter, and the late-summer tropical waves that pass through here can turn into storms. Because the harbour is sheltered, work here normally runs alongside or at a protected anchorage and can proceed in parallel with cargo operations rather than competing with them for the berth window.
Work is taken at the commercial quays of Porto Grande, Mindelo cruise terminal, bunkering anchorage in the bay and fishing port, and which of those a vessel ends up at changes the dive plan more than the season does. Teams mobilise via São Vicente (VXE), so give us the ETA as early as you have it — the travel is the flexible part, the approvals and the working window are not.
What we typically find at Mindelo
Liquid and gas tonnage here spends long stretches at the terminal or waiting for a slot, so growth tends to be even and well established across the hull rather than patchy — heavier than the trading pattern suggests, and further along than a speed report alone would indicate.
Shelter is a mixed blessing for a hull. The same calm that makes the port easy to work in is still water, and still water grows fouling faster than an exposed berth does.
Standard scope of work
Included as standard on every propeller polishing attendance, wherever the vessel is. Anything outside it is quoted separately and flagged before mobilisation, never added afterwards.
- Deposit removal
- Calcareous growth, shell and hard deposits removed from both blade faces without gouging or scoring the blade surface.
- Progressive polishing
- Successive abrasive grades work the blade from rough to fine, finishing at a Class A mirror surface across the full blade area.
- Edge finishing
- Leading and trailing edges dressed to restore profile and remove the roughness that seeds cavitation.
- Boss and hub
- Boss, hub and rope guard cleaned, with stern tube seal condition inspected and reported.
How we deliver it at Mindelo
- 1
Scope and vessel details
Tell us the vessel, her particulars, the coating specification and the window at Mindelo. We come back with a defined scope, a crew size and a duration we will stand behind. Where the conditions here will not support what has been asked for, we say so at this stage rather than after mobilisation.
- 2
Permits and approvals
ENAPOR – Portos de Cabo Verde approves the work alongside the local harbour master, and at a state port that conversation is quicker but less formal — it is worth having in writing. Diving permission, terminal approval and any environmental clearance for in-water work are handled by us, not left with the agent to chase.
- 3
Mobilisation to Mindelo
Divers, compressors, brush carts and cameras mobilise via São Vicente (VXE). Where a vessel is also calling at Tarrafal, one mobilisation is normally sized to cover both.
- 4
Safety setup and the dive
The vessel is secured for diving — main engine, shaft and thrusters immobilised, sea suctions confirmed shut, permit agreed with the master. Teams work under surface supervision with continuous diver communications and video throughout.
- 5
Report and handover
A completion report covering propeller polishing is issued with before-and-after imagery, coating and anode condition and anything found that you should know about. The findings are discussed with the vessel rather than emailed and forgotten.
Mindelo Port at a glance
- UN/LOCODE
- CVMIN
- Port type
- State Port
- Island
- São Vicente
- Country
- Cape Verde
- Water body
- Mindelo Bay (Porto Grande), Atlantic Ocean
- Port authority
- ENAPOR – Portos de Cabo Verde
- Main cargoes
- Containers, Fuel and bunkers, General cargo, Fishing catch
- Crew mobilisation
- São Vicente (VXE)
- Services here
- Hull Cleaning
Frequently asked — Propeller Polishing at Mindelo
Do you provide propeller polishing at Mindelo Port?
Yes. Cleanship Marine works Mindelo Port (CVMIN) in São Vicente, Cape Verde, covering the commercial quays of Porto Grande, Mindelo cruise terminal, bunkering anchorage in the bay and fishing port. Teams mobilise via São Vicente (VXE) with the full spread.
Is it worth polishing the propeller at Mindelo during a bunker stop?
For a vessel starting a long ocean passage, yes — the polished propeller works for the whole leg, and the bunker stop already has her stationary in sheltered water. We fit the polish inside the bunkering window so there is no extra port time.
Can propeller polishing be done while the vessel works cargo at Mindelo?
Yes, in most cases. The harbour is sheltered enough that divers work alongside while cargo operations continue, and neither holds the other up. The vessel stays on hire throughout, and there is no diversion and no dry dock. We scope against the conditions at Mindelo and tell you honestly whether the window you have is enough.
Do you need a diving permit from ENAPOR – Portos de Cabo Verde?
Yes, and we obtain it. Diving permission from ENAPOR – Portos de Cabo Verde, terminal approval where the berth requires it, and any environmental clearance for in-water work are arranged as part of the job rather than left with the agent. The master's permit to work and the immobilisation of machinery are agreed on board before anyone enters the water.
What is underwater visibility like at Mindelo?
Visibility at Mindelo Port is the best of any Cape Verdean harbour inside the sheltered crater bay, reduced only close to the busy commercial quays, and the trade-wind and swell season sets the outer limits of the calendar. How the tide and sea state shape the dive plan is set out in full in the working-conditions section on this page.
Which vessels do you carry out propeller polishing on at Mindelo?
Transatlantic vessels calling for bunkers, Cruise ships, Feeder container ships, Fishing vessels and Inter-island ferries — the traffic at Mindelo Port runs to containers, fuel and bunkers, general cargo, so those are the profiles we see most. The scope is sized to the vessel, not to a standard package.
How quickly can a team mobilise to Mindelo?
Divers and equipment mobilise via São Vicente (VXE). Give us the ETA and the window and we will confirm what is achievable rather than promise a date we cannot hold. Where the vessel also calls at Tarrafal or Palmeira, one mobilisation is often sized to cover both.
What does propeller polishing at Mindelo cost?
It depends on the vessel's dimensions and wetted area, the fouling state found, the coating specification and the working window available at Mindelo. We would rather scope it properly and give you a specific figure than quote a headline rate that changes once the work starts. Send the details and the window at Mindelo and you get a scoped price, usually the same working day.
Propeller Polishing at Mindelo Port.
Tell us the vessel, her ETA at Mindelo and the window. You get a scope, a crew size and an honest duration — usually the same working day.