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Deflow LEGI ALONSO - thruster fins - FUT - L

Deflow LEGI ALONSO - thruster fins - FUT - L

The Legi Alonso model was developed to provide agile, fast, and maneuverable performance, specific...

Best current price£69.95from Bob Gnarly Surf

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Bob Gnarly SurfDeflow Legi Alonso - Thruster Fins Black Size Large
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£69.95
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CronjagerLove Waves Black Deflow Legi Alonso - Thruster Fins
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£74.95
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Product Information

Full details

The Deflow LEGI ALONSO thruster fins are designed for intermediate to advanced surfers who want to maximize agility and speed in typical beachbreak conditions. By utilizing the proven Supra structure, these fins offer the perfect balance of flex and drive, allowing surfers to adapt quickly to flat wave sections while maintaining a secure grip during aggressive rail turns. The primary caveat is that their performance-oriented design is best suited for responsive, fast-paced waves rather than heavy, longboard-style cruising.

All features

Model Part NumberS1047.01-BLK-FUT-L
BrandDeflow Surf

Extended Product Information

FAQs

Are these fins suitable for beginners?

These fins are generally aimed at intermediate to advanced surfers who can benefit from the high-performance flex and agility features.

What does the 35/39 Rake mean?

The rake refers to the sweep or curve of the fin; a 35/39 rake provides a balance between drive (speed) and pivot (turning).

Can I use these in FCS boxes?

No, this specific model (FUT) is compatible only with the Futures fin box system.

What is the primary difference between the side and center fins?

The side fins are larger to provide drive and grip, while the smaller, more curved center fin is designed for maneuverability.

How do I identify if these are the right size?

These fins are labeled 'Large,' which typically corresponds to surfers weighing between 75kg and 95kg, depending on board volume.

Troubleshooting

Fin feels loose in the box

Check if the fin screw is fully tightened and ensure there is no sand preventing the fin base from seating completely.

Difficulty inserting fin into the box

Clean the fin box with a soft brush to remove dried salt or sand and ensure the fin base is not damaged.

Pros and Cons

Pros

  • Excellent speed generation in flat wave sections
  • High agility for quick turns in beachbreak conditions
  • Absorbs chop effectively due to refined flex patterns
  • Secure rail-to-rail hold
  • Lightweight and durable construction

Cons

  • Not ideal for slow, mushy, or extremely long-period waves
  • May feel overly sensitive for beginner surfers
  • Requires a Future fin box system specifically

Setup, Compatibility & Care

These fins are designed for use with the Futures (FUT) fin box system. To install, ensure your fin boxes are free of sand or debris. Insert the base of the fin into the box at a slight angle, pressing the back down until it sits flush. Tighten the fin screw until firm—do not overtighten, as this can damage the box or the fin base. To maintain the fins, rinse them thoroughly with fresh water after every session to prevent salt buildup. If you notice any hairline cracks after a heavy impact, inspect the fin base for structural integrity before your next paddle out.

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