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Single Rope Technique Rescuemates

RM2 RM22
RM2 RM22

Overview


RM2 Rescuemate
(#667)

Front Rear
Front Rear
 
Side Open for Rigging
Side Open for Rigging

Technical Details

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 69 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 unfinished aluminum pulley is 48 mm. in diameter. 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.

Comments

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.

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.

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.


RM22 Rescuemate
(#668, 2658)

Front Rear
Front Rear
 
Side Open for Rigging
Side Open for Rigging

Technical Details

I acquired my SRT RM22 Rescuemate from Inner Mountain Outfitters in 1994. I acquired another in 2017 as part of Bob Thrun's collection.

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 two unfinished aluminum pulleys are 48 mm. in diameter. 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.

Comments

No directions came 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.

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.

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.