Our aircraft is designed to fly over specific areas for months, carrying various payloads for tasks like imagery, sensing, and telecommunications. What we\u2019re building behaves like a drone in some ways, and like a satellite in other ways. Much like satellites, we\u2019re able to provide service for long periods of time, but we\u2019re also much closer to users (we fly at around 20 km altitude) and able to maneuver or remain over an area of interest. This makes what we\u2019re building really well suited to applications that require continuous coverage or high-resolution/bandwidth data.
Examples of this include continuous real-time monitoring (such as in wildfire management or illegal fishing), high-resolution mapping and imagery (we\u2019re able to collect sub-10 cm resolution imagery), and high-speed direct-to-device internet. The ability to permanently host sensors and devices in the sky in this way opens the door to lots of new opportunities. In truth, we still don\u2019t know all the new applications that will arise from this (we\u2019re really interested to hear your thoughts on potential applications!).
As for the technical details: Our aircraft is battery electric and driven by propellers. It has a large wing for high aerodynamic efficiency and to generate the necessary lift required to fly in the thin air of the stratosphere. The wing is covered in solar cells, during the day, these power the aircraft and charge its batteries. Through the night, battery energy is deployed to continue flight. We repeat this process daily, enabling us to fly for up to a year without needing to land. Ultimately, battery cycle life is what limits our aircraft\u2019s flight endurance - and we can land, carry out simple maintenance tasks and then re-launch to continue flying. Our aircraft has multiple tails which help to stabilize the ultra-lightweight structure (our 20 ft. prototype weighs just 13 lbs.). We also use these tails to control the aircraft, they provide roll control by twisting the main wing of the aircraft, increasing or decreasing lift as needed.
The aircraft is fully autonomous; it has a full autopilot system onboard and various sensors for position, airspeed, and other key data streams (much like a typical drone or UAS). The aircraft flies at high altitudes of around 70,000 ft. (20 km) avoiding cloud cover, civil air traffic, and the turbulent winds of the troposphere.
Long endurance flight has been the goal of many past projects. NASA\u2019s Helios and the DARPA Vulture program tried to develop long endurance aircraft. Helios\u2019s crash led to an overhaul of aircraft structural analysis codes, and DARPA Vulture led to advancements in battery and solar tech. More recently, both Facebook\u2019s Aquila and Google\u2019s Loon were discontinued. Recent advancements in battery and solar tech, and miniaturization of electronics mean long endurance flight is now feasible - but we are aware we need to do things differently to succeed. Unlike those before us, we\u2019re not tying ourselves to a single application and are focused on bringing a cost-effective solution to market. That means avoiding research-grade components and moving quickly. Additionally, we firmly believe that iterating to a solution will allow us to continue making progress where others have stalled and lost momentum. We\u2019ve seen this before in hard tech where companies like SpaceX and Helion Energy have made rapid progress against difficult problems.
We approach our technology with an iterative design philosophy - we\u2019ll keep building and learning as we go. We use-off-the-shelf components, iterate quickly, and design for easy assembly to keep costs low. For example, from clean sheet to flight, we designed, built, and flew our 20 ft. aircraft in less than two months. After our first flights, we prepared our 24-hour-capable prototype in two weeks, which successfully completed its non-stop 24-hour flight on first launch. Having proved our core technologies at a smaller scale, we\u2019re now moving onto bigger things. Our next goal is to fly a full-scale 110 ft. wingspan aircraft in the stratosphere next year!
Both of us have Masters degrees in Aerospace Engineering and we then spent 6 years working together on delivery drones at Amazon Prime Air. Whilst the application is very different - we\u2019ve found our knowledge of drone and robotics hardware to be invaluable so far with Radical. By using readily available components, learning through iteration, and designing an aircraft that is easy to assemble, we can keep the cost of our aircraft low and address many markets that weren\u2019t feasible before.
We\u2019re really excited about the technology we\u2019re developing, it's a challenging physics problem that pushes the boundaries of what is possible. Super excited to share this with you and to hear your thoughts and comments!"},"title":{"fullyHighlighted":false,"matchLevel":"full","matchedWords":["aiuc"],"value":"Launch HN: Radical (YC W23) \u2013 Autonomous high-altitude solar aircraft"}},"_tags":["story","author_jthomaslm","story_37901120","launch_hn"],"author":"jthomaslm","children":[37901980,37902036,37902101,37902105,37902255,37902363,37902410,37902425,37902471,37902509,37902528,37902544,37902617,37902660,37902691,37902730,37902731,37902810,37902969,37903002,37903026,37903253,37903288,37903321,37903421,37903457,37903501,37903552,37903817,37903926,37903931,37904173,37904321,37904470,37904532,37904673,37904708,37904745,37904841,37905257,37905550,37905653,37905968,37906133,37906169,37906353,37906619,37907875,37908440,37908781,37908830,37909264,37909943,37910198,37910399,37910567,37910949,37911820,37912038,37912474,37912487,37912498,37913119,37916177,37916535,37916796,37916822,37917171],"created_at":"2023-10-16T15:23:57Z","created_at_i":1697469837,"num_comments":201,"objectID":"37901120","points":402,"story_id":37901120,"story_text":"Hey, HN! We're James and Cyriel, co-founders of Radical. We're making an autonomous solar-powered aircraft designed for continuous flight in the stratosphere. Our 20 ft. prototype recently flew nonstop for over 24 hours, which you can see in this video: https://youtu.be/E6oDxQYEksc (edit\u2014warning, there are rapidly flashing lights starting just after 1m, in case you're sensitive to that). Our website is at https://www.radicalaero.com/, but it's pretty bare. If you use LinkedIn, we have a few more posts at https://www.linkedin.com/company/radicalaero.
Our aircraft is designed to fly over specific areas for months, carrying various payloads for tasks like imagery, sensing, and telecommunications. What we\u2019re building behaves like a drone in some ways, and like a satellite in other ways. Much like satellites, we\u2019re able to provide service for long periods of time, but we\u2019re also much closer to users (we fly at around 20 km altitude) and able to maneuver or remain over an area of interest. This makes what we\u2019re building really well suited to applications that require continuous coverage or high-resolution/bandwidth data.
Examples of this include continuous real-time monitoring (such as in wildfire management or illegal fishing), high-resolution mapping and imagery (we\u2019re able to collect sub-10 cm resolution imagery), and high-speed direct-to-device internet. The ability to permanently host sensors and devices in the sky in this way opens the door to lots of new opportunities. In truth, we still don\u2019t know all the new applications that will arise from this (we\u2019re really interested to hear your thoughts on potential applications!).
As for the technical details: Our aircraft is battery electric and driven by propellers. It has a large wing for high aerodynamic efficiency and to generate the necessary lift required to fly in the thin air of the stratosphere. The wing is covered in solar cells, during the day, these power the aircraft and charge its batteries. Through the night, battery energy is deployed to continue flight. We repeat this process daily, enabling us to fly for up to a year without needing to land. Ultimately, battery cycle life is what limits our aircraft\u2019s flight endurance - and we can land, carry out simple maintenance tasks and then re-launch to continue flying. Our aircraft has multiple tails which help to stabilize the ultra-lightweight structure (our 20 ft. prototype weighs just 13 lbs.). We also use these tails to control the aircraft, they provide roll control by twisting the main wing of the aircraft, increasing or decreasing lift as needed.
The aircraft is fully autonomous; it has a full autopilot system onboard and various sensors for position, airspeed, and other key data streams (much like a typical drone or UAS). The aircraft flies at high altitudes of around 70,000 ft. (20 km) avoiding cloud cover, civil air traffic, and the turbulent winds of the troposphere.
Long endurance flight has been the goal of many past projects. NASA\u2019s Helios and the DARPA Vulture program tried to develop long endurance aircraft. Helios\u2019s crash led to an overhaul of aircraft structural analysis codes, and DARPA Vulture led to advancements in battery and solar tech. More recently, both Facebook\u2019s Aquila and Google\u2019s Loon were discontinued. Recent advancements in battery and solar tech, and miniaturization of electronics mean long endurance flight is now feasible - but we are aware we need to do things differently to succeed. Unlike those before us, we\u2019re not tying ourselves to a single application and are focused on bringing a cost-effective solution to market. That means avoiding research-grade components and moving quickly. Additionally, we firmly believe that iterating to a solution will allow us to continue making progress where others have stalled and lost momentum. We\u2019ve seen this before in hard tech where companies like SpaceX and Helion Energy have made rapid progress against difficult problems.
We approach our technology with an iterative design philosophy - we\u2019ll keep building and learning as we go. We use-off-the-shelf components, iterate quickly, and design for easy assembly to keep costs low. For example, from clean sheet to flight, we designed, built, and flew our 20 ft. aircraft in less than two months. After our first flights, we prepared our 24-hour-capable prototype in two weeks, which successfully completed its non-stop 24-hour flight on first launch. Having proved our core technologies at a smaller scale, we\u2019re now moving onto bigger things. Our next goal is to fly a full-scale 110 ft. wingspan aircraft in the stratosphere next year!
Both of us have Masters degrees in Aerospace Engineering and we then spent 6 years working together on delivery drones at Amazon Prime Air. Whilst the application is very different - we\u2019ve found our knowledge of drone and robotics hardware to be invaluable so far with Radical. By using readily available components, learning through iteration, and designing an aircraft that is easy to assemble, we can keep the cost of our aircraft low and address many markets that weren\u2019t feasible before.
We\u2019re really excited about the technology we\u2019re developing, it's a challenging physics problem that pushes the boundaries of what is possible. Super excited to share this with you and to hear your thoughts and comments!","title":"Launch HN: Radical (YC W23) \u2013 Autonomous high-altitude solar aircraft","updated_at":"2026-09-04T18:22:38Z"},{"_highlightResult":{"author":{"matchLevel":"none","matchedWords":[],"value":"consumer451"},"title":{"fullyHighlighted":false,"matchLevel":"full","matchedWords":["aiuc"],"value":"Ukraine destroys more than 40 military aircraft in drone attack deep in Russia"},"url":{"fullyHighlighted":false,"matchLevel":"full","matchedWords":["aiuc"],"value":"https://www.npr.org/2025/06/01/nx-s1-5419509/ukraine-destroys-military-aircraft-attack-inside-russia-planes"}},"_tags":["story","author_consumer451","story_44150789"],"author":"consumer451","children":[44150858,44150982,44151043,44151075,44151143,44151177,44151206,44151226,44151550,44151565,44151723,44151783,44151858,44151971,44151975,44152150,44152177,44152304,44152609,44152710,44152862,44153020,44154061,44154095,44154206,44154620,44154634,44154792,44154794,44154855,44154908,44154949,44155031,44155117,44155169,44155176,44155494,44156213,44156830,44157656,44158687,44161236],"created_at":"2025-06-01T13:39:44Z","created_at_i":1748785184,"num_comments":661,"objectID":"44150789","points":383,"story_id":44150789,"title":"Ukraine destroys more than 40 military aircraft in drone attack deep in Russia","updated_at":"2026-07-28T13:45:06Z","url":"https://www.npr.org/2025/06/01/nx-s1-5419509/ukraine-destroys-military-aircraft-attack-inside-russia-planes"},{"_highlightResult":{"author":{"matchLevel":"none","matchedWords":[],"value":"tchalla"},"title":{"fullyHighlighted":false,"matchLevel":"full","matchedWords":["aiuc"],"value":"FBI operating fleet of surveillance aircraft flying over US cities"},"url":{"matchLevel":"none","matchedWords":[],"value":"http://www.theguardian.com/us-news/2015/jun/02/fbi-surveillance-government-planes-cities"}},"_tags":["story","author_tchalla","story_9646065"],"author":"tchalla","children":[9646566,9646768,9646995,9647027,9647114,9647140,9647162,9647284,9647344,9647468,9647559,9647613,9647687,9648043,9648100,9648118,9648195,9648319,9648356,9648583,9648879,9648888,9648937,9649189,9649793,9650127,9650469,9650842],"created_at":"2015-06-02T14:29:05Z","created_at_i":1433255345,"num_comments":217,"objectID":"9646065","points":379,"story_id":9646065,"title":"FBI operating fleet of surveillance aircraft flying over US cities","updated_at":"2023-09-07T02:53:04Z","url":"http://www.theguardian.com/us-news/2015/jun/02/fbi-surveillance-government-planes-cities"},{"_highlightResult":{"author":{"matchLevel":"none","matchedWords":[],"value":"OJFord"},"title":{"fullyHighlighted":false,"matchLevel":"full","matchedWords":["aiuc"],"value":"Solar-powered aircraft flown for nearly three weeks without landing"},"url":{"fullyHighlighted":false,"matchLevel":"full","matchedWords":["aiuc"],"value":"https://eandt.theiet.org/content/articles/2021/10/solar-powered-aircraft-flown-for-nearly-three-weeks-without-landing/"}},"_tags":["story","author_OJFord","story_28829668"],"author":"OJFord","children":[28830432,28830563,28830577,28830620,28830795,28830851,28830922,28830963,28830965,28830973,28831000,28831084,28831157,28831186,28831196,28831242,28831301,28831580,28831620,28831639,28832975,28833727,28834655,28835698,28837309,28837514,28850311],"created_at":"2021-10-11T15:49:22Z","created_at_i":1633967362,"num_comments":217,"objectID":"28829668","points":379,"story_id":28829668,"title":"Solar-powered aircraft flown for nearly three weeks without landing","updated_at":"2024-09-20T09:35:23Z","url":"https://eandt.theiet.org/content/articles/2021/10/solar-powered-aircraft-flown-for-nearly-three-weeks-without-landing/"},{"_highlightResult":{"author":{"matchLevel":"none","matchedWords":[],"value":"mancerayder"},"title":{"fullyHighlighted":false,"matchLevel":"full","matchedWords":["aiuc"],"value":"Coronavirus clue? 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It has historically been extremely tedious though: scanning dozens of janky sites which have interminable page loading times; back buttons take you all the way back to the homepage etc.
The site I built - GovAuctions - lets you search every government surplus auction at once. You can filter by location, category, and price, save items to a watchlist, and get alerts when new auctions match what you're looking for.
Let me know what you think, if you have any suggestions, and if you find any deals in your area!"},"title":{"fullyHighlighted":false,"matchLevel":"full","matchedWords":["aiuc"],"value":"Show HN: GovAuctions lets you browse government auctions at once"},"url":{"matchLevel":"none","matchedWords":[],"value":"https://www.govauctions.app/"}},"_tags":["story","author_player_piano","story_47662945","show_hn"],"author":"player_piano","children":[47663327,47664148,47664280,47664475,47664545,47664585,47664931,47665109,47665219,47665338,47665431,47665599,47665739,47665822,47666023,47666420,47666851,47666871,47666896,47666906,47667098,47667914,47668566,47668968,47669065,47669700,47670836,47671044,47671088,47671659,47671789,47671801,47672244,47672951,47673248,47673450,47675232,47678296,47698544],"created_at":"2026-04-06T16:21:46Z","created_at_i":1775492506,"num_comments":91,"objectID":"47662945","points":319,"story_id":47662945,"story_text":"I've long been into finding deals on government auction sites (seizures, surplus sales etc.) - right now for example San Diego DHS is selling 26 tons of lead shot, with bidding starting at $1,000 \u00af\\_(\u30c4)_/\u00af
It has historically been extremely tedious though: scanning dozens of janky sites which have interminable page loading times; back buttons take you all the way back to the homepage etc.
The site I built - GovAuctions - lets you search every government surplus auction at once. You can filter by location, category, and price, save items to a watchlist, and get alerts when new auctions match what you're looking for.
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