Clawtype version 2.1 is a compact, one-handed input device combining a chorded keyboard and mouse. Using only five keys, it allows for typing, mouse movement, clicking, scrolling, and modifiers like shift and control. The device connects via USB and its small size makes it portable and suitable for use in confined spaces. The creator demonstrates its functionality in a video, showcasing text entry and mouse control, highlighting its potential for efficient one-handed computing.
The "Whoosh Rocket" is a simple experiment demonstrating Newton's Third Law of Motion (for every action, there's an equal and opposite reaction). A plastic bottle, partially filled with water and pressurized with air, launches upwards when the air is released. The compressed air exerts force equally in all directions inside the bottle. When the stopper is removed, the air rushes out the opening, creating thrust. This downward force of the escaping air creates an equal and opposite upward force on the bottle, propelling it skyward. The amount of water affects the rocket's performance – too little and there isn't enough mass to be propelled efficiently; too much and the extra weight hinders its flight.
The Hacker News comments on the NASA "Whoosh Rocket" article largely focus on the surprising amount of thrust generated by this simple demonstration. Several commenters express fascination with the physics involved and the counterintuitive nature of the thrust being independent of the surrounding air pressure. Some discuss the educational value of the experiment, highlighting its simplicity and effectiveness in illustrating fundamental principles of rocket propulsion. One commenter provides further context by linking to a video demonstrating the experiment in a vacuum chamber, reinforcing the concept of thrust being generated solely by the expelled propellant. Another points out the historical significance of the experiment, linking it to a similar demonstration performed by Robert Goddard, considered the father of modern rocketry. There's a brief discussion comparing this type of rocket to other propulsion systems, and one user asks a clarifying question about the relevance of nozzle shape.
This YouTube video showcases a Toshiba BW-2112, a Japanese typewriter from the 1980s. The video demonstrates the typewriter's various functions, including typing in Japanese using katakana and hiragana, as well as English letters and numbers. The presenter highlights the machine's unique features like the half-space key, margin settings, and correction capabilities. They also demonstrate changing the ribbon and the overall operation of the typewriter, emphasizing its compact and portable design.
HN users generally enjoyed the video showcasing the Toshiba BW-2112 typewriter, praising its design, sound, and the creator's obvious enthusiasm. Several commenters reminisced about using typewriters, highlighting the satisfying tactile experience and the focus they demanded. Some discussed the typewriter's specific features, like the unique key spacing and the half-space key. A few users expressed interest in finding a similar model, and others shared links to resources for typewriter enthusiasts. One compelling comment thread debated the practicality of using vintage typewriters today, considering factors like maintenance, ribbon availability, and the lack of editing capabilities.
The video demonstrates a functioning bicycle built with omni-directional ball wheels instead of traditional wheels. The creator showcases the build process, highlighting the custom-made frame and the challenges of incorporating the spherical wheels. The bike's unique mechanics allow for sideways and diagonal movement, though it requires considerable effort and balance to maneuver, resulting in a slow and somewhat wobbly ride. Despite the unconventional design, the creator successfully demonstrates the bike's ability to move in various directions, proving the concept's feasibility.
Commenters on Hacker News largely praised the engineering and ingenuity of the omni-directional bike. Several expressed fascination with the complex mechanics and control systems required to make it work. Some discussed the potential applications of such a drive system, suggesting uses in robotics or other vehicles. A few questioned the practicality of the design for everyday use, citing potential issues with efficiency, terrain handling, and the learning curve required to ride it. There was also some discussion about the similarities and differences between this design and other omni-directional vehicle concepts. One commenter even offered a mathematical analysis of the kinematics involved.
Summary of Comments ( 16 )
https://news.ycombinator.com/item?id=43588420
Commenters on Hacker News generally expressed interest in the Clawtype keyboard, praising its compact design and potential for ergonomic benefits, especially for those with limited desk space or RSI concerns. Several questioned the practicality and learning curve, wondering about its speed compared to traditional keyboards and the difficulty of mastering the chords. Some offered suggestions for improvement, like adding a wrist rest or thumb cluster, while others shared experiences with similar one-handed keyboards, highlighting the tradeoffs between portability and typing proficiency. A few users requested information on key remapping and software customization options. Overall, the response was a mix of curiosity, cautious optimism, and practical considerations regarding the device's usability.
The Hacker News post for Clawtype v2.1, a one-handed chorded USB keyboard and mouse, generated a moderate amount of discussion with several commenters expressing interest and raising relevant points.
Several comments focused on the practicality and ergonomics of the device. One user questioned the long-term comfort and potential for repetitive strain injuries, especially given the concentrated movements required for both keyboard and mouse functionality. Another user pondered the learning curve, suggesting it might be steeper than initially perceived due to the complex chord combinations needed for typing and mouse control. A separate comment emphasized the importance of regular breaks and proper posture, acknowledging the inherent strain of using such a device for extended periods.
Some comments revolved around the potential applications and target audience for Clawtype. One user suggested it could be beneficial for individuals with disabilities or limited mobility, while another user envisioned its use in specific professional settings, such as video editing or CAD work, where intricate mouse control is crucial. There was also a discussion about the device's potential for gaming, with some users expressing skepticism about its suitability for fast-paced action games but acknowledging its possible advantages in slower-paced strategy games.
A few technical queries were also raised. One commenter inquired about the availability of open-source firmware or software customization options, while another user asked about the device's compatibility with different operating systems. A separate comment discussed the technical challenges of designing and manufacturing such a complex device, praising the creator's ingenuity.
Finally, several comments simply expressed admiration for the project, acknowledging the creator's innovation and dedication. Some users expressed interest in purchasing the device or learning more about its development.