Average 5% FO Saving Effect (at same ship speed) or boost ship's speed by 2% (at same horsepower).

Reduction of torque-rich conditions.
・Reduction of stern vibration and underwater noise.
・Elimination of rudder erosion.

PBCF will eliminate the Hub Vortex to increase the thrust and meantime to reduce the propeller torque.

PBCF will improve the propeller efficiency and the PBCF effect essentially will not depend on the size or type of the vessel.

It is expected to be about 5% effect on average at any ship speed.

There is no negative effect in any way.
We have installed PBCF over 4,300 vessels until now and there has been no problem for Hull or Shafting.

Not at all.

There is no effect for ship-maneuvering performance (forwarding, reversing, circling, stopping)

Sea Trial/Voyage Data on actual vessels are included the interference in actual sea way, like wind, wave, sea current and there is a lot of variation in the data.

Upon request, we will analyze PBCF effect and submit a report.

In tank tests conducted under the three-dimensional wake flow of actual ships, an energy-saving effect of approximately 3-4% was confirmed. The PBCF is compatible with ducts and pre-swirl fins, and while the energy-saving effect reduced by about 1% compared to when these ESDs are not present, an energy-saving effect of approximately 3-4% can still be expected.

In a tank test under the three-dimensional wake flow of an actual ship, an energy-saving effect of about 1% was confirmed. The PBCF and the rudder bulb has same function to eliminate the hub vortex, so compared to the case without the rudder bulb, even the energy-saving effect of the PBCF reduced, the fuel-saving effect of about 1% can be expected.

The possibility of installing a PBCF is case-by-case, so please contact our sales department for inquiries. Additionally, we are currently researching and developing a PBCF that is 30% shorter than the normal cap length. Once development is completed, PBCF will be able to be installed on vessels that previously could not apply it due to the cap length restrictions.

PBCF is fastened to propeller boss by bolts, comparable to the installation of conventional propeller boss cap.

No, installation fee has not included in PBCF price. Installation is the scope of the customer and usually this is included in the customer's Dry-dock planning.

It takes about 5～6 hours by 4 workers, in case of installation in dry-docking.

In case of installation on existing vessels at Chinese dockyard, we offer a service to dispatch our supervisor for installation at our expense.
In case of other area, the additional supervising fee is necessary.

• Position relation between Propeller Blade and PBCF
• To use original installation materials, like fastening bolts, torque wrench.
• Apply correct fastening torque to the bolts. PBCF Installation is comparable to the installation of conventional propeller boss cap, without welding works.

No specific maintenance instructions.
PBCF may follow the propeller maintenance. For example, cleaning and polishing. Further we have no objection for special paint or coatings.

• Propeller (incl. propeller particular and boss cap)
• Propeller blade offset table
• Propeller Shaft (shaft end and propeller nut)
• Shaft arrangement (showing the clearance dimension between propeller and rudder)
• Rudder

It is Nickel-Almi-Bronze, same as material as propeller.

PBCF is customer-made product based on propeller design per vessel.
Therefore, PBCF cannot be switched unless completely sister vessel.

No. PBCF is made by using advanced casting technology, as one unit.

PBCF has no moving parts.

It is an energy-saving device installed on propeller, improving propeller efficiency.

It is named after the initials of "Propeller Boss Cap Fins".

Mitsui O.S.K. Lines, West Japan Fluid Engineering Laboratory Co., Ltd and Mikado Propeller (now Nakashima Propeller Co., Ltd.) jointly developed PBCF in 1987.

No, it can easily be installed on both newbuildings and existing vessels.

No need. PBCF is not a class approval item same as normal boss cap.
Certain class request to submit PBCF drawing but it will be arranged by MOL Techno-Trade Ltd.

It takes usually 3 months from receiving firm order. (Based on Delivery in East Asia) In case of delivery to Middle East, Europe or other areas, additional over 1 month will be needed.

All types of merchant vessels, and also high-speed vessels, fishing crafts. PBCF is a propeller improver.

• PBCF body
• ccessories set (Original bolts, Calibrated Torque Wrench, Gasket, sheet packing or O-ring, locking wire and installation manual)
• For delivery to East Asia by sea freight: transportation fee included (CIF at port East Asia)

Yes, basically possible. However, for some propeller makers or types of CPP, the installation of PBCF is impossible, sho