Essentials SDM V2 Aluminium Mast Extension (U-Pin) 45
The perfect extension for beginners and recreational windsurfers seeking reliable performance at an accessible price point. Thoughtfully designed to make rigging easier for everyone.
The Essentials SDM Aluminium Extension V2 combines durability with user-friendly features that matter most on the water. The reinforced nylon base includes an improved pulley system with three larger diameter rollers that significantly reduce the effort needed for downhauling your sail.
Practical design elements enhance your rigging experience. The generously sized base allows for comfortable rigging even when barefoot, while the strategically positioned cleat lets you release the downhaul rope with a single quick motion. The lightweight aluminium construction keeps overall rig weight down without sacrificing the reliability you need.
Ideal for beginners, casual weekend warriors, and windsurfing schools looking for dependable equipment that makes getting on the water simpler and more enjoyable.
Care & Maintenance
- Rinse thoroughly after each use to remove salt and sand.
- Keep sliding components clean and sand-free to prevent wear.
- Replace your downhaul line at least once per season.
- Apply silicone lubricant to cleats for better grip.
- Inspect for cracks, corrosion, or worn components before each session.
- Store completely dry, away from UV exposure.
- Never leave extension inside the mast during storage.
Warranty
At Unifiber, we stand behind everything we make.
- First year: Your product is completely covered.
- Second year: Continued support against manufacturing defects.
- Keep your proof of purchase handy when you need us.
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.
Explore our extensions.
Essentials RDM V2 Aluminium 30
RDM - 30 cm - Aluminium, U-Pin
From 64.95 EUR
