21629211 Propeller Blade Kit | Genuine Volvo Penta Part

🔧 Product Description

Genuine Volvo Penta blade kit for the 2-blade folding propeller for 5-40 hp. Designed for engines from 5 up to 40 hp. Available in multiple sizes and pitches for both S-drives and shafts, in 18 x 12 in. Volvo Penta folding propellers give minimal drag while sailing combined with the high thrust of a fixed propeller while motoring, even in reverse. The patented design, with protruding blade tips, opens the blades instantly as the propeller starts to turn, and the swept high-skew blade design keeps running smooth and quiet with minimal vibration. Reduced drag under sail increases speed by up to 1.5 knots compared with a fixed propeller.

🚤 Compatibility

Typically suits:

• Volvo Penta D2-55F
• Volvo Penta D2-50F
• Volvo Penta D1-30F
• Volvo Penta D1-13F
• Volvo Penta D1-20F

• Engine Family: D
• HP Range: 13-55 HP
• Year Range: Approximately 1970s onward; final sizing is controlled by engine, reduction ratio and vessel data

⚙️ Key Features

• 18 x 12 inch, right hand
• For shaft installations
• Two-blade folding propeller range for 5 to 40 hp
• Nibral nickel-bronze-aluminium blades
• Kit contains blades, hex key for the locking screw, propeller grease and instructions
• 5.251 kg
• 18 x 12 in diameter x pitch.
• Listed for shaft installations.
• Powerful thrust even in reverse thanks to patented blade geometry.
• Smooth, low-noise operation with minimal vibrations.
• Safe opening with quick response in both forward and reverse.
• Rubber bushing and galvanic isolation (hubs for S-drives).
• Made of extremely strong and durable nibral (nickel-bronze-aluminium) alloy.
• Material: nibral
• Fits: Shaft installations
• Type: 18 x 12

📋 Kit Contents

• Matched 18 x 12 right-hand Nibral folding propeller blade - supplied under kit number 21629211 - quantity 2; no separate Volvo blade number published
• Hex key for the blade locking screws - quantity 1; no separate Volvo service number published
• Volvo propeller grease pack - quantity 1; no separate service number published for the included pack
• Installation instructions - quantity 1; no separate part number

🔌 Function

Provides the folding blade pair: water pressure on the protruding blade tips throws the blades open the moment the propeller turns and centrifugal force completes the swing, so the propeller drives ahead and astern under power and folds flat against the hub when the engine is stopped.

⚠️ Common Signs of Failure

• Weak thrust and low boat speed from blades that do not open fully
• Vibration under power that disappears the instant gear is disengaged
• A heavy clunk from the stern on engagement
• Cavitation pitting and erosion along the blade edges, or a bent tip
• Rounded root gear teeth and worn pivots found on strip-down

🛠️ Service Notes

• A complete propeller is one blade kit plus one hub kit - the hub kits are 21630720 for S-drives, 21630725 pre-drilled, 21630721 for a 25 mm shaft, 21630722 for a 30 mm shaft, 21630723 for a 1 inch shaft and 21630724 for a 1 1/4 inch shaft
• 21629205 is the same 18 x 12 size in the other hand; the left hand kits are the ones catalogued for S-drives as well as shafts
• Size has to be calculated against the engine and gear ratio rather than guessed, and your Volvo Penta dealer can run that calculation
• For a complete propeller, order one blade kit and one hub kit.
• Propeller size has to be calculated to match engine and gear ratio - contact your Volvo Penta dealer.
• Blade kit includes blades, hex key for the locking screw, lubricant grease and installation instruction.
• Volvo Penta water-resistant multi-purpose premium grease is highly recommended for greasing propeller shafts, folding propellers and all other propeller components.

🔄 Supersession & Cross Reference

OEM / Related Numbers

• 21626924 related blade pivot / shaft pin used in Volvo hub kits
• 3595221 related blade locking screw used in Volvo hub kits
• shaft hub kits 21630721-21630725

📦 Condition

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