21433611 Propeller | Genuine Volvo Penta Part

🔧 Product Description

Genuine Volvo Penta four-blade nibral propeller for Volvo Penta IPS 3, IPS 30, the rear half of the type Q1 counter-rotating pair. It is machined from the specially developed nibral (nickel-bronze-aluminium) alloy Volvo Penta uses for its IPS propellers, which gives minimum growth, excellent durability and corrosion resistance. Volvo Penta IPS turns the propellers round to a forward-facing position, so the twin counter-rotating propellers pull the boat through the water rather than push it, and optimal interaction between the front and rear propeller holds performance and fuel efficiency across the whole speed range. The rear propeller carries the patented flow deflector, which controls the water flow and minimizes pressure and wear on the propeller shaft seals.

🚤 Compatibility

Typically suits:

• Volvo Penta D13C2-B MP
• Volvo Penta D13C2-A MP
• Volvo Penta D13C4-A MP
• Volvo Penta D13B-L MP
• Volvo Penta D13B-G MP
• Volvo Penta D13B-K MP
• Volvo Penta D13B-C MP
• Volvo Penta IPS30-E
• Volvo Penta D13C6-A MP
• Volvo Penta IPS3-C
• Volvo Penta D13C4-B MP
• Volvo Penta D13C5-B MP
• Volvo Penta D13C5-A MP
• Volvo Penta IPS30-D
• Volvo Penta IPS3-A
• Volvo Penta D13C7-B MP
• Volvo Penta D13C8-B MP

• Engine Family: D, IPS

⚙️ Key Features

• Type Q1 rear propeller for IPS 3 and IPS 30
• Nibral nickel-bronze-aluminium alloy, the Type Q/QS series for IPS with D13 engines
• 30.391 kg
• Pairs with Type Q1 front propeller 21433601; complete set is 21433621
• 17 applications across the D13 MP engines and IPS3 / IPS30 drives
• Right-hand rotation
• Includes line cutter
• Includes flow deflector to reduce shaft seal wear
• Type Q1 rear propeller, four-blade.
• Extremely strong and specially developed nibral (nickel-bronze-aluminium) alloy.
• Minimum growth, excellent durability and corrosion resistance.
• Fully CNC machined and precisely balanced.
• Patented flow deflector minimizes pressure and wear on propeller shaft seals.
• The type Q/QS propeller is type approved by DNV for D13 IPS900, IPS1050, IPS1200 and IPS1350.
• Material: nibral
• Fits: Volvo Penta IPS 3, IPS 30 (D13 engines)
• Type: Q1
• Set contains: set 21433621, front 21433601

🔌 Function

Runs behind the front propeller and turns the opposite way, recovering the swirl left in its wake as further thrust and cancelling the sideways pull a single propeller would produce. It is also the propeller the line cutter mounts to, and its Q1 designation has to match the front propeller for the engine to be loaded correctly.

⚠️ Common Signs of Failure

• Vibration through the hull that comes in at a particular speed
• Loss of top speed with the engine reaching or exceeding its rated revs
• Chipped, curled or bent blade tips and trailing edges after an impact
• Cavitation erosion showing as pitted, roughened patches on the blade backs
• Rope or fishing line found wound behind the hub, with the shaft seal weeping

🛠️ Service Notes

• This number is one propeller of a pair - order the Type Q1 front 21433601 with it, or the complete Q1 set 21433621, because a mismatched pair will not let the engine reach its rated speed
• The Q1 front 21433601 and rear 21433611 are published at 101 kg and 30.391 kg, 12.398 kg less than the 143.789 kg published for the set, so the figures do not reconcile - order by the Q1 designation, never by weight
• For commercial running in polluted or debris-laden water Volvo Penta also lists the QE series, which has thicker blades than the Q for extra strength at a slight cost in top speed, and is approved for D13 IPS900, IPS1050 and IPS1200
• Fit front and rear to the same type code - complete set 21433621.
• Line cutter 21686496 is the one listed for Volvo Penta IPS 3, IPS 30.

🔄 Supersession & Cross Reference

OEM / Related Numbers

• 21433601 - Matching Q1 front propeller
• 21433621 - Complete matched Type Q Q1 propeller set
• 21297787 - Propeller cone kit

📦 Condition

• Genuine Volvo Penta part
• Brand new
• Supplied in original or equivalent packaging