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I acquired my SRT RM2 Rescuemate from Inner Mountain Outfitters in 1994. The SRT RM2 Rescuemate is 254 mm tall, 80 mm wide, and 40 mm thick. Mine weighs 695 g.
The Single Rope Technique RM22 Rescuemate is a single pulley with an eccentric cam that prevents one strand of rope from entering the device. The central frame is an anodized aluminum extrusion with a rectangular channel for mounting the cam and an 18-mm U-shaped channel for the rope. The cam has a hold-open safety mounted on the lower tip of the cam. The cam is riveted to the frame, so it cannot easily be replaced when worn. It is a pity that this wasn't bolted on. A 3-mm cord is tied to the cam so the cam can be opened remotely. On the back of the frame there is a cord lock mounted with an Allen-head cap screw. There is a rope guiding post complete with a nonfunctional groove; however, this part is also used on the SRT stop bobbins, so this is just a case of using a pre-existing part. There is a carabiner hole at the bottom of the device.
The
unfinished aluminum pulley is 48-mm in diameter. I think that
the pulley is too small since it allows the rope to drag on the
back of the cam channel under certain situations. The pulley can
handle ropes up to 13 or 14 mm without dragging, and up to 18
or 20 mm with degraded performance. The pulley side plate is anodized.
The pulley and side plate are riveted to the frame. The pulleys
and side plate are rather tight, and the pulley does not turn
as freely as one might wish.
No directions were provided with the device. There is an obvious way to rig the device for a 2:1 hauling system where the cam supports one half of the load, but the frame pivots with each pull and the rope runs over a portion of the rope channel that should have been rounded, but wasn't. Thirty seconds with a rat-tail file will fix this oversight.
Overall, this is a well-made device designed for rescue applications.
I would recommend choosing the RM22 instead, since the extra pulley
there allows rigging a 4:1 system if desired. Any mechanical advantage
system has certain dangers, so it is important that the team not
overstress any components. When rigged correctly, it is unlikely
that this device will be the weakest link.
[ Top | RM2 | Return to Hauling Pulleys ]
I acquired my SRT RM22 Rescuemate from Inner Mountain Outfitters in 1994. The SRT RM22 Rescuemate is 254 mm tall, 80 mm wide, and 63 mm thick. Mine weighs 902 g.
The SRT RM22 Rescuemate is a double pulley with an eccentric cam that prevents one strand of rope from entering the device. The central frame is an anodized aluminum extrusion with a rectangular channel for mounting the cam and an 18-mm U-shaped channel for the rope. The cam has a hold-open safety mounted on the lower tip of the cam. The cam is riveted to the frame, so it cannot easily be replaced when worn. It is a pity that this wasn't bolted on. A 3-mm cord is tied to the cam so the cam can be opened remotely. On the back of the frame there is a cord lock mounted with an Allen-head cap screw. There is a rope guiding post complete with a nonfunctional groove; however, this part is also used on the SRT stop bobbins, so this is just a case of using a pre-existing part. There is a carabiner hole at the bottom of the device.
The two unfinished aluminum pulleys are 48-mm in diameter. I think that the front pulley is too small since it allows the rope to drag on the back of the cam channel under certain situations. The pulleys can handle ropes up to 13 or 14 mm without dragging, and up to 18 or 20 mm with degraded performance. The pulley side plates are anodized. The pulleys and side plates are riveted to the frame. The pulleys and side plates are rather tight, and the pulleys do not turn as freely as one might wish.
No directions
were provided with the device. There are two obvious ways to rig
the device for a 4:1 hauling system. In the first, the cam supports
one third of the load while the hauling team resets for another
pull. In the second, the cam supports one fourth of the load,
but the frame pivots with each pull and the rope runs over a portion
of the rope channel that should have been rounded, but wasn't.
Thirty seconds with a rat-tail file will fix this oversight.
Overall, this is a well-made device designed for rescue applications.
Any mechanical advantage system has certain dangers, so it is
important that the team not overstress any components. When rigged
correctly, it is unlikely that this device will be the weakest
link.
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©2008, Gary D. Storrick