The STRAPLESS BI 4 from Advance redefines what an ultralight tandem pilot harness can be, targeting a very specialised user base of experienced tandem pilots engaged in mountaineering-style Hike & Fly. Weighing in at an impressive 420 g (size M) to 440 g (size L) including an integrated reserve parachute container, this harness sets a new benchmark in weight savings for certified tandem pilot harnesses.
Design and Construction
At the core of the STRAPLESS BI 4’s appeal is minimalist design. It employs thin, high-strength D-Pro 4 mm webbing for the main and leg straps, rated to withstand up to 13 kN, and features lightweight Skytex 32 fabric with a reinforced nylon seat area. The hardware includes Maillon Rapide links and small standard carabiners, keeping the setup as light as possible. However, this stripped-back approach sacrifices certain protective elements; notably, it lacks a built-in back protector or energy absorber, which are common in traditional tandem harnesses. This absence means passive safety, especially during hard landings, is reduced compared to heavier, bulkier commercial harnesses.
Purpose and Usage
The STRAPLESS BI 4 is explicitly engineered for tandem pilots who undertake Hike & Fly missions where every gram counts—think alpine summits and bivouac projects rather than commercial tandem operations. Its EN 1651:2018+A1:2020 certification at a maximum load of 120 kg is well matched to light pilot-plus-passenger configurations typical for these settings. The harness’s compactness, lightweight materials, and sizing options (M for 155–185 cm and L for 178–202 cm) make it suitable for most tandem pilot builds prioritising weight and minimal bulk over traditional comfort or load capacity.
Comfort, Usability, and Safety Trade-Offs
Designed for mostly short, upright flights, comfort is utilitarian rather than luxurious. Its narrow chest strap width and alpine harness geometry impart a technical feel that diverges from classic tandem seating comfort, reflecting its niche as a technical tool rather than a universal tandem solution. Importantly, the integrated reserve container under the right leg pad stands out as a practical feature, making rescue deployment straightforward despite the minimalism.
However, pilots must accept the trade-offs: no back protector and a minimalist frame means less shock absorption and reduced comfort during rough terrains, long flying days, or frequent commercial use. This harness is unsuitable for heavy, repetitive commercial tandems or those seeking plush passive safety.
Market Positioning and Brand Synergy
Advance positions the STRAPLESS BI 4 as part of a coherent ultralight ecosystem alongside their STRAPLESS 4 solo harness and traditional tandem harnesses like BIPRO 4 and BIPAX 2. This alignment allows pilots loyal to the brand to maintain a lightweight profile across their entire Hike & Fly tandem kit, including wings, harnesses, and reserves. Its standout feature remains minimal weight and volume, a compelling factor for serious alpine tandem projects.
Advantages
- Exceptionally low weight and compact size, ideal for demanding alpine Hike & Fly tandem missions.
- EN certification and integrated reserve container provide a safety framework within lightweight constraints.
- Simple, durable construction promises low bulk and ease of inspection.
Limitations and Considerations
- No built-in back protector limits passive safety during hard landings, making it unsuitable for commercial workloads.
- Target load of 120 kg restricts use to sport/touring tandems with light passengers and gear.
- Handling and in-flight comfort are minimalist, reflecting more alpine gear than traditional tandem harness comfort.
Customer Reviews and General Feedback
As of now, no direct customer reviews or user feedback are publicly available for the STRAPLESS BI 4. Based on its specifications and parallels with similar ultralight tandem harnesses, it can be inferred that pilot reception will be split between those valuing minimalism and weight reduction against those prioritizing comfort and passive safety. Pilots experienced with string harnesses will find it familiar and efficient, while traditional tandem pilots may find its reduced structure and protections too limiting for everyday use.
Conclusion
The Advance STRAPLESS BI 4 is a highly specialised tool designed for expert Hike & Fly tandem pilots who demand the lightest certified ultralight harness on the market. It excels where weight savings and compactness are paramount but requires acceptance of lower comfort and protection. It offers a unique solution that complements a niche flying style rather than replacing traditional tandem pilot harnesses.
For more information, visit the manufacturer's website and order your gear through Paragliding4.me to ensure you get authentic equipment suited to your high-mountain tandem adventures.