21821254 Propeller | Genuine Volvo Penta Part

🔧 Product Description

Genuine Volvo Penta three-blade nibral propeller for Volvo Penta IPS 3, IPS 30, the front half of the type QS4 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.

🚤 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 D13C7-B MP
• Volvo Penta D13C8-B MP

• Engine Family: D, IPS

⚙️ Key Features

• Type QS4 front propeller for IPS 3 and IPS 30
• Nibral nickel-bronze-aluminium alloy, the Type Q/QS series for IPS with D13 engines
• 64.41 kg
• Pairs with Type QS4 rear propeller 21821264; complete set is 21821364
• 16 applications across the D13 MP engines and IPS3 / IPS30 drives
• Includes flow deflector to reduce shaft seal wear
• Extremely strong and specially developed nibral (nickel-bronze-aluminium) alloy.
• Minimum growth, excellent durability and corrosion resistance.
• Fully CNC machined and precisely balanced.
• 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: QS4
• Set contains: set 21821364, rear 21821264

📋 Kit Contents

• 1 × Type QS4 front Nibral propeller - 21821254
• Matching rear propeller 21821264, complete set 21821364, cone, nuts and locking hardware are not included

🔌 Function

Meets the water first, ahead of the drive, and turns engine torque into thrust as the leading half of the counter-rotating pair. The QS4 designation is what matches the propeller to the hull and lets the engine reach its rated wide-open-throttle speed.

⚠️ Common Signs of Failure

• Vibration through the hull that rises with revs and eases when you throttle back
• Loss of top speed, or a boat slow to come onto the plane at the usual revs
• Blade tips bent, chipped or curled after touching bottom or striking debris
• Blade faces pitted or eroded by cavitation, usually near the leading edge
• Propeller hard to draw off, with corrosion or fretting on the shaft splines

🛠️ Service Notes

• This number is one propeller of a pair - order the Type QS4 rear 21821264 with it, or the complete QS4 set 21821364, because a mismatched pair will not let the engine reach its rated speed
• The published weight is identical to that of 21821264 (QS4 rear), so weight cannot separate the two - order by the designation
• 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 21821364.
• Line cutter 21686496 is the one listed for Volvo Penta IPS 3, IPS 30.

🔄 Supersession & Cross Reference

OEM / Related Numbers

• 21821264 - matching QS4 rear propeller
• 21821364 - complete QS4 matched propeller set

📦 Condition

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