Show HN: Scroll – A New Way to Publish https://bit.ly/3aIBFKP

Show HN: Scroll – A New Way to Publish https://bit.ly/3bw2m4A February 22, 2021 at 05:29PM

Show HN: A no-code billing platform, all under your own domain. https://bit.ly/2NNsSOL

Show HN: A no-code billing platform, all under your own domain. https://bit.ly/3umk5nE February 22, 2021 at 03:47PM

Show HN: Try CLIP, OpenAI's new model, from the browser https://bit.ly/3aFyu6z

Show HN: Try CLIP, OpenAI's new model, from the browser https://bit.ly/3scktmA February 22, 2021 at 05:06PM

Show HN: Kraken Bitcoin Profit Calculator https://bit.ly/3qILSwr

Show HN: Kraken Bitcoin Profit Calculator https://bit.ly/2NPRQN8 February 22, 2021 at 04:35PM

Launch HN: H3X (YC W21) – High power density electric aircraft motors https://bit.ly/3kaoDsB

Launch HN: H3X (YC W21) – High power density electric aircraft motors Hey HN! I’m Jason, one of the co-founders at H3X ( https://bit.ly/2ZHcGB4 ). We are building the lightest electric propulsion systems in the world. Our first product is a 250kW (330HP) integrated motor drive in a 18kg (40lb) package. It combines the electric motor, inverter, and gearbox into a single unit, resulting in an ultra-high-power density solution for electric aircraft (and other mass sensitive applications). In terms of electrification, we believe the aircraft industry is where automotive was ten years ago. There are many companies working on eVTOL and single-seaters, but very few are working on large commercial single-aisle electric aircraft such as a 737. This class of aircraft is absolutely critical to electrify as it accounts for the most passenger-miles [1] and is the biggest slice of the pie in terms of aviation emissions. Beyond the environmental impact, there are huge potential cost savings from both fuel (or lack thereof) and reduced maintenance for airlines. Aircraft are very mass sensitive so there are two main technology challenges that need to be solved to enable this class of electric aviation – (1) High energy density and efficient energy storage (batteries, hydrogen fuel cells, etc.) (2) Light, efficient, and high-power density electric propulsion systems (electric motors, power electronics, gearbox) There are many people working on (1) and great strides are being made [2][3]. We are focused on solving (2). A study done by the DOE determined that for a 737 to complete a five-hour flight, the propulsion system must be >12 kW/kg [4]. Today, best-in-class systems have a power density of 3-4 kW/kg. With our first product, we are targeting 13 kW/kg, making it an attractive solution for near-term Advanced Air Mobility (AAM) applications as well as an enabling technology for the aviation industry to enter the next stage of electrification. There are some cool things we are doing with the electromagnetics, power electronics, and the integration between the systems to get to the 13 kW/kg. There is not a single magic bullet, but rather a combination of multiple technological advances - 3D printed copper stator coils, high frequency SiC power electronics, and a synergistic cooling system to name a few. Our origins in electrification stem back to our college days where we built Formula-style electric racecars (s/o to Wisconsin Racing FSAE!). During year 1 of the program, we got so fed up with our COTS motors and inverters, we decided to go clean slate and build our own from the ground up the following year. Those were super happy fun times. Lots of dead IGBTs and all-nighters in the shop, but in the end, we got everything working and delivered! It was a true test of resilience and taught us how to GSD. Great preparation for starting a company. This led us to grad school and it became apparent during this time that the electric aircraft industry was a sleeping giant ready to be woken. We felt uniquely positioned to capitalize on this opportunity, so after about a year in industry, we left our full-time jobs and went all in. We’ve got a long road ahead - aviation is tough, there’s no denying that. In addition to the engineering challenges, there are also major certification barriers. However, CO2 is a serious problem and right now the major aviation players don’t have a compelling plan to meet the goals laid out in the Paris Agreement. Innovation needs to come from the outside and that’s what we’re doing at H3X. I’d love to hear your guys thoughts and would be happy to answer any questions you have. Sources: [1] https://bit.ly/3ka6tHt [2] https://bit.ly/3kbWtgM... [3] https://bit.ly/2MhK1Qa , https://bit.ly/2ZFLjri [4] ASCEND DE-FOA-0002238 February 22, 2021 at 03:11PM

Show HN: Magic Login – Passwordless login and transactional emails as a service https://bit.ly/2ZBpdGp

Show HN: Magic Login – Passwordless login and transactional emails as a service https://bit.ly/2NurZdZ February 22, 2021 at 02:09PM

Show HN: DeKarmaHN, a Chrome extension to hide karma and more https://bit.ly/3aCwewN

Show HN: DeKarmaHN, a Chrome extension to hide karma and more https://bit.ly/2OVHYlD February 22, 2021 at 04:23AM

Show HN: ProSudoku – Play Sudoku with Apple Pencil on iPad https://bit.ly/3aHbCUo

Show HN: ProSudoku – Play Sudoku with Apple Pencil on iPad https://apple.co/3aG4OpR February 22, 2021 at 02:58AM

Show HN: Building a Binary Counter https://bit.ly/2Nq6z1u

Show HN: Building a Binary Counter https://bit.ly/2NKxxAQ February 22, 2021 at 02:33AM

Show HN: Turn scripts into fine-tuned voices via Wiki markups https://bit.ly/2OOSYkH

Show HN: Turn scripts into fine-tuned voices via Wiki markups https://bit.ly/2NMvpZk February 22, 2021 at 12:59AM

Show HN: A contact form that prunes spam https://bit.ly/3unlhqE

Show HN: A contact form that prunes spam https://bit.ly/2NNswaQ February 21, 2021 at 10:14PM

Show HN: Timelineify – Create Spotify playlists of an artist's full discography https://bit.ly/2ZE74aI

Show HN: Timelineify – Create Spotify playlists of an artist's full discography https://bit.ly/3brYEJ5 February 21, 2021 at 07:43PM

Show HN: Book a table in any restaurant with voice AI and build your own app https://bit.ly/2NKyZTZ

Show HN: Book a table in any restaurant with voice AI and build your own app https://bit.ly/3uiDuG3 February 21, 2021 at 07:24PM

Show HN: EnzymeUI – open-source Vue components library https://bit.ly/2Nr0Fxg

Show HN: EnzymeUI – open-source Vue components library https://bit.ly/37wyT9m February 21, 2021 at 07:28PM

Show HN: Ad Network for Sideprojects https://bit.ly/3ss0rVF

Show HN: Ad Network for Sideprojects https://bit.ly/2ZCITcU February 21, 2021 at 06:39PM

Show HN: Free speech Reddit clone (svelte) https://bit.ly/3dvql6B

Show HN: Free speech Reddit clone (svelte) https://bit.ly/2MfgE0S February 21, 2021 at 04:26PM

Show HN: Mp3tag for Mac – universal tag editor now on the Mac https://bit.ly/3k8Gn7D

Show HN: Mp3tag for Mac – universal tag editor now on the Mac https://bit.ly/2OPNXbA February 21, 2021 at 04:24PM

Show HN: CompreFace is a free and open-source face recognition software https://bit.ly/3sbVTT2

Show HN: CompreFace is a free and open-source face recognition software https://bit.ly/3qH9ZeR February 21, 2021 at 04:18PM

Show HN: Go-FrodoKEM a Practical quantum-secure key encapsulation in Go https://bit.ly/3k7O3qC

Show HN: Go-FrodoKEM a Practical quantum-secure key encapsulation in Go https://bit.ly/2ZAUQQb February 21, 2021 at 12:09PM

Show HN: Python Wheel Obfuscator https://bit.ly/3udLXKF

Show HN: Python Wheel Obfuscator https://bit.ly/3aCRbrm February 21, 2021 at 08:26AM