Hackster.io reports that JT Jameson, associated with the YouTube channel Serial Hobbyism, built a custom device that launches a grappling hook with compressed CO₂ and then uses a powered winch to pull its tether upward. The article says Jameson demonstrated it in a climbing gym and on park trees, including a reported ascent of 10 meters in three seconds. That is a claim about a demonstration, not an independently verified performance result or evidence that the device is safe for climbing.
What the device does
Hackster.io describes two distinct operations: a pneumatic launch and a motorized pull. A small CO₂ cartridge supplies the reported 800 PSI used to launch the hook. Paracord runs from the hook to a spool on the device; after the hook catches, a thumb-operated throttle controls the winch that takes up the line.
The article says the user can hold the device by its built-in handle or attach it to a conventional climbing harness. That description does not establish that either configuration has been tested or approved for supporting a person.
What Hackster.io says is inside
The reported drive system centers on a 14-pole brushless outrunner motor of the type used for electric-skateboard propulsion, geared down 9:1 to increase torque. A 200A electronic speed controller (ESC) is controlled through an Arduino Nano on a custom printed circuit board.
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Hackster.io reports two LiPo batteries with a combined capacity of 1,800mAh in a 12s configuration. It also says the ESC supports regenerative charging during descent. The article does not provide manufacturer part numbers, revisions, or a complete bill of materials, so those descriptions are not enough to identify or reproduce the exact build.
The frame is described as a combination of custom-fabricated aluminum and steel parts. These component details are Hackster.io’s account; they are not an independent inspection or engineering assessment.
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What the reported demonstration establishes—and what it does not
Hackster.io says Jameson tested the device in a climbing gym and on park trees. It reports that he ascended 10 meters in three seconds, and writer Cameron Coward called that “incredibly impressive performance.” The publication year is unavailable in the returned source excerpt.
No test protocol, independent validation, or safety certification is provided in the available account. The reported time should therefore be read as a figure attributed to Jameson’s demonstration, not as a repeatable benchmark or proof of a rated climbing system.
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The reported device is a custom build, not a documented retail model. The article distinguishes it from commercial motorized ascenders: those are a separate product category intended for recreational or commercial climbing, and are not designed to fire a grappling hook. The existence of commercial ascenders does not mean this particular launcher-and-winch build is available for purchase.
For a real climbing or work-at-height decision, compare products using their stated intended use, rated load, documented certification, manufacturer instructions, and independent safety information. The available report supplies no comparable rated-load or certification information for Jameson’s custom device, so it cannot support a safety or performance comparison with commercial equipment.
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Why the distinction matters for construction
A powered tether may look like a shortcut to reaching a tree, roof, or elevated work area, but the article’s account is about a maker project—not a documented work-at-height system. It does not establish suitability for construction, rescue, or any other life-safety use. A component list and a brief demonstration cannot substitute for equipment ratings, instructions, and appropriate safety controls.
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