Astus 20.1 Information, Review, Specs

Sailing Performance & Handling

The Astus 20.1 is defined by its light displacement—approximately 350kg to 400kg depending on the version—which allows it to achieve planing speeds that most 20-foot monohulls cannot match. Because it is a trimaran, the primary hull remains relatively narrow, reducing wetted surface area, while the outriggers (floats) provide the necessary righting moment to carry a generous sail plan without the lead ballast required in a keelboat. This results in a highly favorable sail area-to-displacement ratio, particularly in the "S" (Sport) variant, which often featured a larger mainsail and more technical hardware.

According to technical retrospectives provided by Astus Boats, the 20.1 was designed for ease of handling, making it a viable option for solo sailors or small families. The boat tracks well due to its central daggerboard, and the kick-up rudder is essential for those exploring shallow coastal waters or "beaching" the craft. In breezy conditions, the 20.1 feels stiff and secure compared to a dinghy, though its light weight means it can be sensitive to weight distribution. While it lacks the extreme wave-piercing bows found on the later VPLP-designed 20.5, the 20.1 is noted for its "sea-kindliness" in moderate coastal chop, offering a dry ride thanks to the distance between the cockpit and the leeward float.

Interior Comfort & Variations

While the Astus 20.1 is a performance-oriented multihull, it features a modest cuddy cabin that differentiates it from open-deck daysailers. This interior space is best described as a "coastal camping" environment rather than a luxury suite. It provides a dry area for storing sails, gear, and supplies, and offers enough length for two adults to sleep on integrated berths. Headroom is limited, as the cabin profile is kept low to minimize windage and maintain the boat's sleek aesthetic.

The model was offered in two primary configurations: the "Loisir" (Leisure) and the "S" (Sport). The Leisure version was aimed at families, featuring a simpler rig and more durable sails. The Sport version utilized more advanced materials and a larger mast to appeal to regatta-minded owners. Additionally, the "Raid" variant was often discussed in community circles as a middle ground, optimized for long-distance coastal trekking with enhanced storage solutions. The 20.1 eventually paved the way for the Astus 20.2, which utilized the same hull concept but refined the deck molding and increased the volume of the floats for greater buoyancy and speed.

Known Issues & Buyer’s Checklist

Prospective owners of an Astus 20.1 should focus their inspection on the unique mechanical aspects of the trimaran's design. The telescopic beams (the tubes that connect the floats to the main hull) are the boat's most critical innovation but also a primary maintenance point. Over time, salt, sand, and grime can enter the sleeves where the beams slide; if not regularly rinsed, this can lead to scratching or "binding," making it difficult to extend or retract the floats.

Another area for inspection is the daggerboard trunk and the kick-up rudder assembly. Because these boats are frequently used in shallow water and launched from trailers, the leading edges of the foils are prone to impact damage. Buyers should also examine the trampoline tensioning points and the hiking straps for UV degradation. Like many early vacuum-bagged or hand-laid fiberglass boats of this weight class, checking for stress cracks around the mast step and the beam attachment points is highly recommended to ensure the structural integrity of the platform.

Community & Resources

Owners of the 20.1 are supported by a dedicated community of multihull enthusiasts. The most prominent group is the Astus Boats Club, a French-based association that organizes "raids" (coastal rallies) and provides a technical forum for owners to share modifications and maintenance tips. While much of the primary documentation is in French, the club’s influence has helped maintain the resale value and technical longevity of the 20.1 fleet across Europe and North America.

The Verdict

The Astus 20.1 remains a benchmark for trailerable trimarans, offering a blend of speed and simplicity that is difficult to find in modern production boats without moving to a much higher price point.

Pros:

• Exceptional Portability: The telescopic beam system allows for quick transitions from water to road without de-masting.
• Speed-to-Price Ratio: Offers genuine multihull performance and the thrill of hull flying at a fraction of the cost of larger racing tris.
• Versatility: Equally capable of solo afternoon sprints or multi-day coastal "raiding" expeditions.

Cons:

• Minimalist Interior: The cabin is best suited for storage or "hard-walled camping" rather than comfortable cruising.
• Maintenance Intensive: Telescopic beams and trampolines require more diligent care than a standard monohull’s fixed rigging.
• Lightweight Sensitivity: Requires active sail trimming and weight management in gusty conditions to maintain optimal performance.