Aerofoils Mast Seal Board 182×5 — Overview
Original Aerofoils O-ring seal between the eFoil drive unit and the board, dimensions 182 mm × 5 mm. The mast seal is part of the IP68-rated drive system — a fresh seal keeps salt water out of the mounting interface and protects the electronics inside the mast.
Aerofoils recommends inspecting the seal at every wing change and replacing it once it shows visible wear, compression set or hairline cracks. Annual replacement is good practice for boards in regular saltwater use.
Part of the IP68 Drive System
The 182×5 O-ring is the watertight interface between the drive unit / mast assembly and the board mount. A fresh seal is the difference between a dry drive housing and salt-water ingress.
Saltwater-Resistant Elastomer
The original Aerofoils-spec elastomer is sized and compounded for the drive-unit groove and resists salt water, UV and the compression cycles of repeated mounting.
Routine Wear Part
Annual replacement is the standard maintenance interval for boards in regular saltwater use. Inspect at every wing change as a quick check.
Mast Seal Details & Technical Specifications
| Dimensions | 182 × 5 mm (O-ring) |
|---|---|
| Material | Original Aerofoils-spec elastomer (saltwater-resistant, UV-stable) |
| Function | Watertight interface between the drive unit and the board mount |
| Compatibility | All Aerofoils Audi e-tron eFoil drive units |
| Use Case | Routine annual replacement, post-impact service, after visible wear or compression set |
Compatibility — Which Aerofoils Drive Units Fit?
The 182×5 mast seal is the universal seal across the entire Aerofoils Audi e-tron eFoil drive range:
| Drive Unit | Mast Length | 182×5 Seal Fits |
|---|---|---|
| Performance Jetdrive | 80 cm | ✓ |
| Competition eDrive | 80 cm | ✓ |
| Hyperdrive ABS | 60 cm | ✓ |
Who is the Mast Seal Spare for?
The 182×5 Mast Seal serves a clearly defined audience:
- Aerofoils Audi e-tron eFoil owners with a routine annual service schedule — the mast seal is the standard wear part to replace once a season
- Riders who unmount the drive frequently (transport, board swap, off-season storage) and compress the seal repeatedly
- eFoil schools, charter operators and rental fleets servicing multiple drive units and keeping universal seals in the service kit
- Owners noticing salt residue or moisture in the drive housing after a session — a fresh seal is the first thing to replace
FAQ — Fit, Replacement & Care
Who is the Aerofoils Mast Seal for?
Aerofoils Audi e-tron eFoil owners with a routine annual service schedule, riders who unmount the drive frequently, schools / rental fleets keeping universal seals in their service kit, and owners noticing salt residue or moisture in the drive housing.
How often should I replace the mast seal?
Annually for boards in regular saltwater use, or whenever the seal shows visible wear, compression set or hairline cracks. Check at every wing change as a quick visual inspection.
Is this the seal between mast and board?
Yes — the 182×5 O-ring seals the interface between the Aerofoils eFoil drive unit / mast assembly and the board mount, keeping the IP68-rated drive electronics dry.
Which drive units is this seal compatible with?
All Aerofoils Audi e-tron eFoil drive units: Performance Jetdrive 80 cm, Competition eDrive 80 cm and Hyperdrive ABS 60 cm.
Can I replace the seal myself?
Yes — the seal is designed for in-the-field replacement with standard tools. Follow the Aerofoils service guide and clean the seal groove before fitting a new O-ring.
How do I know the seal is worn?
Visible compression set (the O-ring stays flat after removal instead of returning round), hairline cracks, brittleness or any visible deformation. Discolouration alone is not a wear sign.
What happens if the seal fails?
Salt water can enter the drive-unit / board interface and reach the electronics. Replace promptly at the first sign of wear to protect the drive.
Can I keep multiple spare seals in my service kit?
Yes — schools and charter operators typically keep multiple spare seals in their service kit so any drive unit can be serviced quickly between sessions.
Does the seal affect drive performance?
The seal does not affect thrust or top speed directly, but a failed seal allows water ingress that damages the drive electronics and shortens drive-unit life.
How do I store spare seals between uses?
Store in a cool, dry, dark place in the original packaging. Avoid direct sunlight, ozone-producing devices (motors, ozone air purifiers) and contact with oils — these accelerate elastomer ageing.
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