Comparison between MAESTRO and I’D for a rescue using twin tensioned haul lines

Written By: Lance Piatt

Excerpt from Gear In Use 2: Technical Rescue

MAESTRO and I’D allow for efficient hauling, releasing the lock at any time, and a controlled lower of the load. The two devices have different ergonomics and different specifications (working load and efficiency).


The MAESTRO’s efficiency enables the effective use of simple pulley systems. If a complex pulley system is needed to increase efficiency, it can be set up below the device, on the auxiliary attachment point. With the I’D, it may be necessary to set up a parallel haul system such as the JAG SYSTEM, to improve hauling efficiency. In this case, an additional operator is required.

Working load for lowering with the device on the anchor

The direction of handle operation for lowering with the device on the anchor

The direction of handle operation is reversed on MAESTRO and I’D EVAC, compared to the normal direction for the I’D S and L.

On MAESTRO and I’D EVAC, the handle must be pulled downward, which offers optimal ergonomics when the user is in front of or below the anchor.

The handle on the I’D S and L is easier to use when the device can be extended from the anchor. This allows the user to position him/herself between the device and the anchor, so that the device, the rope and the load can be kept in line of sight.

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