Next Return Previous

heightec-PMI Compact D41A

Version A Version B
Version A Version B

Overview


Version A
(#254, 2126)

Front View: Closed Rear View: Closed
Front View: Closed Rear View: Closed
 
Front View: Open for Rigging Rear View: Open for Rigging
Front View: Open for Rigging Rear View: Open for Rigging

Technical Details

I acquired my heightec-PMI Compact D41A from On Rope 1 at the 2008 Old Timers' Reunion. I acquired another in 2017 as part of Bob Thrun's collection.

The D41A is right-handed. This ascender is 113 mm. tall, 72 mm. wide, 27 mm. thick, and weighs 164 g.

The ascender shell is a subrectangular green anodized shape bent from 4.1 mm. aluminum sheet. The rope channel is formed by bending the left side of the ascender into a U. The rope channel is 16.5 mm. in diameter. The main sling attachment point is 1 15.1 mm. hole located below the cam and to the right of the rope channel. A second lower attachment point of the same size lies right and slightly below the first. There is an upper attachment point above the cam, passing through both sides of the rope channel. The upper opening is 18.0 mm. high and 14.9 mm. wide. The right side of the shell is bent on an inclined axis to form another U. A hole drilled through both sides of the U accepts a solid rivet. The cam and cam spring are mounted on this rivet. The head of the rivet is on the front of the shell. The pivot is centered 47 mm. from the inside of the rope groove. There is a 4.9 mm. high, 7.9 mm. cam stop pin riveted to the shell.

The cam is a plated skeletonized steel casting. The cam radius, measured from the pivot, increases from 38 to 52 mm. over an angle of 37°, giving a 26° cam angle. The cam has number of small conical teeth, all of which have their axes approximately perpendicular to the cam face. The tooth pattern is (1.2^3)^2(1.2)^2(B). The B stands for a small bar. A spring-loaded manual safety is mounted mounted on an axle riveted to the bottom center of the cam. The normal action of the spring holds the safety against the cam. The safety has a 12.8 mm. tall, 6 mm. diameter pin mounted on it for the fingers. When the cam is opened, the shell interferes with the safety, thus preventing cam opening. At full open the safety can be released and the spring will hold the tab against the back of the shell, locking the cam open.

The rear of the ascender is printed with "D41A," a book-with-an-"i" icon, "Ø8-13," "0608 074," "heightec-PMI," and "www.heightec.com."

Comments

The heightec-PMI is solidly made. All sharp edges have been removed. It is slightly heavier than average, but it has two good tie-in holes at the base for those who need them. The attachment points are simply holes in the shell, and although rounded they should have been beveled more; even so, I would consider their small radius too sharp for directly attaching rope slings. The upper rope attachment hole is located very close to the main rope. A carabiner through the upper attachment hole will probably drag on the main line. Note that such a carabiner will prevent putting the ascender on or off rope, so one's climbing system must be designed accordingly.

The safety is awkward to use with one hand (like the Petzl Basic). The cam and its teeth are very well made. I'm not sure what purpose the bar serves - several people have sent me emails telling me that the analogous bars on the Lucky AB-20 and VauDe AB-20 Bloquer keep the cam from closing and touching the shell (so what?), but the bar does not do touch the shell on the D41A. Perhaps it is there to keep the ascender from gripping small cord??


Version B
(#1528, 1966, 2127)

Front View: Closed Rear View: Closed
Front View: Closed Rear View: Closed
 
Front View: Open for Rigging Rear View: Open for Rigging
Front View: Open for Rigging Rear View: Open for Rigging

Technical Details

I acquired my first Heightec-PMI Compact D41A, Version B from On Rope 1 in 2009, a second from FRHAM Safety Products, Inc. in 2013, and another in 2017 as part of Bob Thrun's collection.

The Heightec-PMI Compact D41A, Version B is 112 mm. tall, 73 mm. wide, and 26 mm. thick, and weighs 160 g. The shell and cam are the same as those on Version A, but the cam safety on Version B is molded from plastic.

The rear of the ascender is printed with "D41A," a book-with-an-"i" icon, "Ø8-13," "300909 106," "heightec-PMI," and "www.heightec.com."

Comments

The new safety is as awkward to use with one hand as the older one is.