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Safe-Tec Duck-R
(#1808, 2638)

Front View Rear View End View
Front View Rear View End View

Technical Details

I acquired my Safe-Tec Duck-R from Altius Technical Services in 2013. I acquired another in 2017 as part of Bob Thrun’s collection.

My Safe-Tec Duck-R is 72 mm. long, 97 mm. wide, 41 mm. high, and weighs 249 g. The Duck-R uses an aluminum frame with a rectangular cross section. The frame wraps around the static rope. A forged aluminum lever is mounted in the frame, and can be pulled through the back of the frame to allow rigging the rope. The lever is spring loaded so it will automatically return to the operating position. A projection on the rope side of the lever presses the rope against the frame. A projection on the other side of the lever moves in a slot in the frame, limiting the lever’s travel. There is a small hole in the back of the lever that one can attach a small cord to to allow remotely releasing the device.

The front is forged with an up-pointing arrow, "DUCK," and "S.tec." It is also stamped with the letter "R." The rear has a forged danger symbol (exclamation point inside a triangle). It is etcehd with "CE 0120," "EN 12841:2006A," "Ø 10,5-11mm," "Max 100kg," "13/08-A0027," and a book-with-an-"i" icon.


The Duck-R uses the same operating principle as Type 2 Lever Cam Ascenders like the Petzl Shunt. Unlike the Shunt, the Duck-R only works on single ropes.

Tests reported by the the US Bureau of Reclamation showed that the Duck-R does not always engage
It sometimes allows the user to drop the full length of the safety rope.

(Shaun Reed, Drop Testing of Rope Access Backup Devices, also see