Essentials RDM V2 Aluminium Mast Extension (U-Pin) 30
Essentials RDM V2 Aluminium Mast Extension (U-Pin)
Built for ease, priced for access – the extension that gets everyone windsurfing, faster.
Confidence starts at the rig
The Unifiber Essentials RDM V2 Aluminium Extension (U-Pin) is your go-to for smoother starts and no-fuss sailing. Whether you’re teaching, learning, or just out for a weekend blast, this extension simplifies the setup process so you can spend more time on the water and less time rigging.
Rigging made intuitive
A reinforced nylon base, oversized pulleys, and smart cleat positioning combine for an ultra-friendly rigging experience. The 3-roll pulley system dramatically reduces the force required for downhauling, even for lighter riders or younger sailors.
- 3-roll pulley system: Less effort, smoother tensioning
- Comfortable flat base: Rig barefoot, no problem
- Quick-release cleat: Downhaul control with a single pull
- Reinforced build: Stands up to regular school and recreational use
- Lightweight aluminium construction: Keeps your setup responsive
Made for learning, built to last
This is the perfect extension for entry-level to intermediate windsurfers and is durable enough for windsurf schools, clubs, and rentals. Available in both 30 cm and 45 cm options to suit a range of sail sizes and conditions.
- Forgiving and practical: No learning curve required
- Durable and dependable: Handles the wear of frequent use
- SDM option available: For larger rigs and learners using standard diameter masts
Technical specifications
| Model | Downhaul System | Range Settings | Weight |
|---|---|---|---|
| Essentials RDM V2 Aluminium Extension (U-Pin) 30 | 3-roll pulley | 4 – 30 cm | Approx. 0.619 kg |
| Essentials RDM V2 Aluminium Extension (U-Pin) 45 | 3-roll pulley | 4 – 45 cm | Approx. 0.718 kg |
Key advantages
- Beginner-optimized design with no-fuss features
- School- and rental-grade durability
- Easier downhauling for all skill levels
- Compatible with Reduced Diameter Masts (RDM)
- Also available in SDM version for larger sail setups
Considerations
Not suitable for high-performance or race sails. Tailored for everyday windsurfing and beginner-friendly environments
- Mast compatibility : RDM
- Wall Thickness : 1.5 mm
- Max Insertion :
- Downhaul Ration : 8:1 - 3 pulleys
- Extension range : 10 - 30 cm
- Pulley angle : 0 Degrees
- Pulley diameter :
- Polyester 4.0mm
- Rope compatibility :3.8mm - 4.0mm
- Rinse your extension thoroughly after each use to remove corrosive salt and abrasive sand.
- Keep sliding components clean and sand-free to prevent wear.
- Replace your downhaul line at least once per season and apply silicone lubricant to cleats for better grip.
- Before hitting the water, always inspect for cracks, corrosion, or worn components like pulleys and pins.
- Store your extension completely dry in a protective bag away from UV exposure, and never leave it inside the mast during storage to prevent corrosion.
What does features 1 year unconditional + 1-year conditional warranty cover ?
At Unifiber, we're confident in the quality of our gear and stand behind everything we make.
Here's how our warranty works:
- First year: Your product is completely covered - simple as that. We've got your back so you can focus on enjoying your time on the water.
- Second year: We continue to support you against any manufacturing defects because we believe in building gear that lasts.
- To make things hassle-free, just keep your proof of purchase handy when you need us., we're confident in the quality of our gear and stand behind everything we make.
Learn More
Choosing the right windsurf mast extension can make a big difference in your rigging experience and overall performance on the water.
From pulley systems to downhaul ratios, every detail plays a role in ease of use and durability.
In this FAQ, we’ll answer the most common questions to help you find the perfect extension for your setup.
1. What type of rope should I use for a boom or mast base extension?
- It’s best to use Dyneema or Spectra rope, as they are highly durable and have low stretch. A diameter of 4–5 mm is ideal to minimize friction while ensuring a good grip.
2. What do I need to know about mast extension insertion length?
- Because of the tapered shape of an SDM mast, there's a limit to how far one can insert the mast extension. This value relates to the total length of your extension tube, not to confuse with the range settings.
- A maximum 45 cm insertion length means that most 32cm mast extensions can be fully inserted into the mast. A maximum 60 cm insertion length means that most 46cm mast extension can be fully inserted.
- In case a non Unifiber brand extension does not fit, as an alternative solution the mast extension end cap can be removed without problem.
3. What is the downhaul ratio?
- The downhaul ratio refers to the mechanical advantage provided by the pulley system.
- For example, a 3:1 system means that for every unit of force applied, the tension on the sail is multiplied by three. Modern extensions often have 4:1 or even 6:1 systems, making downhauling easier with less effort.
4. Why is the pulley angle important?
The pulley alignment affects how easy it is to downhaul the sail. Proper alignment between the extension’s pulleys and the sail’s pulleys reduces friction and makes rigging easier. If the pulleys are misaligned, the rope can wear out faster, and downhauling becomes more difficult.
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