The beartrap is the Canadian name of a device invented for smaller warships, like frigates and destroyers, that carry helicopters. While not essential to enable embarked helicopters to operate from small escort vessels, it enables them to operate in a wider range of weather conditions. Once secured and after straightening, the Beartrap is used to traverse the aircraft in and out of the hangar This allows movement in and out of the hangar in more severe conditions than if it had to be towed in the conventional way.