Two Rope Twin Tension Mini Offset: Bridging Backcountry and Fire Service Rescue

The Two Rope Twin Tension Mini Offset is an intersection of backcountry rescue techniques and fire service methods often feels like a clash of ideologies. Yet, as the demand for efficient and adaptable rescue systems grows, these worlds are beginning to overlap in productive ways. With smaller teams, varying training levels, and unique gear requirements on both sides, the challenge lies in creating systems that honor both environments while ensuring safety and functionality.

This experiment explores a “mini two rope offset” system designed to blend the principles of backcountry rescue and fire service operations. The result is a proof-of-concept rigging system that highlights the potential for collaboration and innovation.

The Setup: Near Stage Operations

Twin Tension System with CMC MPDs

At the heart of this setup is a mirrored twin tensioned system anchored by two CMC MPDs. This configuration provides a 2 x 3:1 mechanical advantage, theoretically delivering a 6:1 system. The design eliminates the need for changeovers during lowering, with ratchets (Sterling Aramid 6.8mm Hollowblock Prusiks) facilitating smooth transitions.

Artificial High Directional (AHD) with SMC Vector

A gin pole setup, represented by the SMC Vector, serves as the artificial high directional. Compact and efficient, this tool is perfect for scenarios requiring minimal space. While the head of the Vector offers limited working room, its design caters to specific rigging needs, making it an invaluable asset in constrained environments. The “delta guy” system adds stability with three supporting legs.

The Setup: Far Stage Operations

Arizona Vortex in SA Frame Configuration

On the far stage, an Arizona Vortex is configured in an SA Frame, splitting the two rope system between its legs. Known for its stability and versatility, the Vortex ensures reliable performance even under challenging conditions.

Guying System with Petzl Jag and Sterling Powercord

The guying system incorporates a Petzl Jag System for compression against the opposing leg, supported by Sterling 5.9mm Powercord. This combination delivers a balanced tensioning system. For additional adaptability, the mechanical advantage haul-to-lower system employs two Petzl GriGri devices, blending lightweight efficiency with functionality.

Ground-Level Operations

Cascade Rescue Litter Setup

The ground-level setup includes a Cascade Rescue Litter rigged with interlocking long tail bowlines. Fully adjustable head and foot setups provide versatility and adaptability for different patient scenarios.

Key Takeaways: A Mixed Approach

This proof-of-concept rigging system intentionally mixes tools and techniques from backcountry and fire service protocols. While each system has its limitations when applied outside its traditional environment, combining them reveals exciting possibilities:

1. Adaptability: Fire service teams may not typically use Petzl GriGri devices for two rope systems, while backcountry teams might find CMC MPDs less practical. Blending these tools shows how versatility can enhance operations.
2. Efficiency: Smaller teams benefit from a compact and efficient system, reducing setup time while maintaining safety.
3. Collaboration: This experiment demonstrates the potential for shared principles and gear adaptation to improve rescue capabilities across disciplines.

The final system is not a one-size-fits-all solution but an exploration of what’s possible when boundaries are pushed. Whether for a single-person load or a small team operation, this concept offers valuable insights into bridging two distinct rescue cultures.

Peace on your days..

Lance