2020 North Sonar Mast to Foilboard Adapter

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2020 North Sonar Mast to Foilboard Adapter

Constructed from the highest quality aircraft grade 6061-T6 Anodized Aluminium, the Sonar mast is available in three different heights to suit your rider style. The section profile reflects an optimized balance for strength to weight ratio and incorporates our GeoLock tapered geometry locking connections for optimized load transfer. The mast is tapered to fi t a  lightweight adapter which incorporates a geometry locking connection for a better load transfer and more direct feel.


  • 165x90 bolt pattern
  • Lightweight design
  • Precisely CNC machined 6061-T6 aluminium
  • Geometry locking connection between mast and adapter
  • Rubber gasket
  • Included in complete foil editions
  • Sold separately as a spare part

In traditional industry foil setups, the mast simply bolts to the fuselage. But we found foils coming back from product testing with all the screws bent. We needed to design a more effective load-bearing system to lock the mast to the fuselage.

Drawing from yacht design, and specifically keel boat racing, our Product Manager Uli Somerlatt engineered a unique geometry locking connection, using a tapered composite fuselage adapter to sit between the mast and the fuselage. The screws engage the GeoLock, making the load transfer more effective and preventing the fitting from loosening over time.

The composite adapter between the mast and fuselage helps to isolate the contact between the metal parts, and minimizes the risk of corrosion by salt water, ensuring a more durable and long lasting connection.

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