DYNAFIBER RDM ALU INOX EXTENSION

The Dynafiber RDM Alu Inox Extension (also known as the "Inox Alu") is the heavy-duty aluminum sibling to the Carbon version we discussed. It is designed for sailors who prioritize absolute mechanical reliability and affordability over the weight savings of carbon.

For 2026, it remains one of the most popular "bomb-proof" extensions on the market, especially in the European scene.

1. The "Inox" Advantage

The term "Inox" refers to the marine-grade Stainless Steel used in the pulley block and the release mechanism.

• Corrosion Resistance: Unlike standard aluminum or plastic bases, the stainless steel base is impervious to the pitting and oxidation caused by salt water.
• Structural Integrity: The pulley block is cast as a solid metal unit. Under extreme downhaul tension, it will not flex, crack, or "crush" like plastic bases.
• Heavy-Duty Button: The eject button is also made of steel, ensuring it won't jam with sand or snap off over time.

2. High-Grade Aluminum Tubing

• Material: Uses high-tempered T8 aluminum. T8 is significantly stiffer and stronger than the 6061 aluminum found in entry-level gear.
• Durability: Aluminum has a "bend before break" failure mode. While carbon can snap instantly under a freak load (like a massive mast-first impact in the surf), aluminum is more likely to bend slightly, often allowing you to limp back to shore.
• Wall Thickness: Since it is an RDM (Reduced Diameter Mast) extension, the aluminum walls are relatively thick, making it extremely difficult to crush or kive.

3. Technical Specifications (2025/2026 Model)

4. Who is this for?

• Wave Sailors: Who need an extension that can survive being tumbled in the surf.
• Heavy-Duty Freeriders: Who want a reliable piece of gear that will last for 10+ years without maintenance.
• Budget-Conscious Pros: It offers nearly the same rigidity as carbon but at roughly 40% lower cost (usually around €85–€105 depending on the length).

Summary: Alu Inox vs. Carbon Inox

• Weight: The Carbon Inox is about 150g–200g lighter. You’ll feel this "swing weight" during transitions and jumps.
• Stiffness: Carbon is theoretically stiffer, but in RDM sizes, the Alu Inox T8 is so rigid that most sailors won't notice a difference in sail performance.
• Longevity: Aluminum can eventually suffer from surface oxidation if never rinsed; Stainless Steel (Inox) and Carbon are virtually immune to the elements.