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    "all_locations": "San Francisco, CA, USA; Santa Clara, CA, USA",
    "long_description": "Momentus is a space infrastructure services company. As a first mover, Momentus will offer the most basic, foundational services that enable businesses to flourish in space. With their experienced team of aerospace, propulsion, and robotics engineers, Momentus makes and operates cost-effective and energy-efficient in-space transport and service vehicles that utilize water plasma propulsion technology. Momentus has service agreements in place with numerous private satellite companies, government agencies, and research organizations.",
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    "team_size": 125,
    "industry": "Industrials",
    "subindustry": "Industrials -> Aviation and Space",
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    "status": "Public",
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        "full_name": "Mikhail Kokorich",
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    "name": "SpaceRyde",
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    "one_liner": "The Rocket Network: Sustainable & On-Demand Delivery Anywhere in Space",
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      "Sustainable Tourism",
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        "full_name": "Sohrab Haghighat",
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    "id": 12877,
    "name": "EPIC AEROSPACE",
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        "full_name": "Ignacio Belieres Montero",
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    "id": 13476,
    "name": "Daedalus",
    "slug": "daedalus",
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    "year_founded": 2019,
    "city": "San Francisco",
    "country": "US",
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        "full_name": "Jonas Schneider",
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        "is_active": true,
        "linkedin_url": "https://www.linkedin.com/in/jonas-schneider/",
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        "date": "Feb 08, 2024"
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        "title": "Y Combinator alum Daedalus aims to build the most advanced factories on the planet; raises €10.1M | Silicon Canals",
        "url": "https://siliconcanals.com/crowdfunding/daedalus-raises-10-1m/",
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    "id": 23817,
    "name": "Epsilon3",
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    "subindustry": "B2B -> Operations",
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        "full_name": "Laura Crabtree",
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    "id": 27198,
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      "url": "https://www.ycombinator.com/people/jared-friedman"
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        "user_id": 831322,
        "full_name": "Joel Darin",
        "title": "Founder",
        "founder_bio": "Most recently first employee at Hermeus where I designed, built and tested a Turbine-Based-Combined-Cycle prototype demonstrator up to Mach 4+. Prior to that I worked at GE Aviation in Afterburner Design. Before GE I was at Georgia Tech where I did research in computational fluid dynamic simulations of reacting flows while obtaining a MS in Combustion. I started at Michigan State University with a BS in Mechanical Engineering. ",
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      {
        "title": "An Ohio Hypersonic Engine Manufacturer is Blasting Off — in Business and Into the Atmosphere – TechOhio",
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        "date": "Oct 31, 2022"
      },
      {
        "title": "Velontra Contracts with Venus Aerospace",
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        "title": "Greater Cincinnati startup Velontra lands spot in prestigious Y Combinator",
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      }
    ],
    "launches": [
      {
        "id": 65001,
        "title": "✈️ Velontra - Hypersonic space plane that can take-off from any location and weather",
        "tagline": "Propelling Innovation",
        "body": "Velontra is building a hypersonic space plane that can takeoff from anywhere in any weather.\n\nCheck us out at <https://velontra.com/>\n\n**Problem**\n\n1\\.     Conventional Rocket-based launch is expensive (>$5000 per kg)\n\n2\\.     Rocket launch cancellations cost satellite companies millions\n\n3\\.     Launch lead times are greater than 1 year\n\n4\\.     Satellite companies do not get launched into their desired orbits\n\n**Solution**\n\nVelontra is building a hypersonic space plane that can takeoff from anywhere in any weather.  This horizontal takeoff increases launch reliability and enables customers to directly access any orbit.  Our air-breathing propulsion system is up to 6 times more fuel efficient than any rocket, and uses oxygen from the air which creates thousands of pounds of additional payload capacity.\n\n![uploaded image](/media/?type=post&id=65001&key=user_uploads/848374/3cac1349-a095-4ac8-b60c-2753b8220b70)\n\n**Revenue Generating Products**\n\nHere are the steps of our tech development path.\n\n1\\.     Propulsion System\n\n2\\.     Supersonic UAV\n\n3\\.     Hypersonic UAV\n\n4\\.     Space Plane for Low Earth Orbit\n\n**How It Works**\n\nThe hypersonic space plane will work by taking off from any runway with a jet propulsion system.  Next, it will climb to over 100,000’ and Mach 5.  At this point, it will launch a 2nd stage rocket directly into the desired Low Earth Orbit.\n\n**Ask**\n\nOur Ask is for introductions to any company putting anything into orbit.  We are pursuing LOI’s and customer discovery.",
        "url": "https://www.ycombinator.com/launches/GuP-velontra-hypersonic-space-plane-that-can-take-off-from-any-location-and-weather",
        "votes": 19,
        "created_at": "2022-07-29T15:23:52.592Z"
      }
    ]
  },
  {
    "id": 37999,
    "name": "RATLOG",
    "slug": "ratlog",
    "former_names": [],
    "small_logo_thumb_url": "https://bookface-images.s3.amazonaws.com/small_logos/c91e646aa134e7ed3da1082d56c2a3cdd68f8337.png",
    "website": "https://www.ratlog.space/",
    "all_locations": "Dresden, SN, Germany",
    "long_description": "",
    "one_liner": "Reusable heavy-lift rockets",
    "team_size": 4,
    "industry": "Industrials",
    "subindustry": "Industrials -> Aviation and Space",
    "launched_at": 1791657873,
    "tags": [
      "Commercial Space Launch"
    ],
    "tags_highlighted": [],
    "top_company": false,
    "isHiring": false,
    "nonprofit": false,
    "batch": "Fall 2026",
    "status": "Active",
    "industries": [
      "Industrials",
      "Aviation and Space"
    ],
    "regions": [
      "Germany",
      "Europe"
    ],
    "stage": "Early",
    "app_video_public": false,
    "demo_day_video_public": false,
    "app_answers": null,
    "question_answers": null,
    "url": "https://www.ycombinator.com/companies/ratlog",
    "api": "https://devasheeshg.github.io/yc-api/batches/fall-2026/ratlog.json",
    "year_founded": 2026,
    "city": "Dresden",
    "country": "DE",
    "linkedin_url": "https://www.linkedin.com/company/103988498/",
    "x_url": "",
    "fb_url": null,
    "cb_url": null,
    "github_url": null,
    "logo_url": "https://bookface-images.s3.amazonaws.com/small_logos/c91e646aa134e7ed3da1082d56c2a3cdd68f8337.png",
    "app_video_url": null,
    "dday_video_url": null,
    "company_photos": [],
    "primary_partner": {
      "name": "Kulveer Taggar",
      "url": null
    },
    "founders": [
      {
        "user_id": 3609163,
        "full_name": "Charlie Weise",
        "title": "Founder/CEO",
        "founder_bio": "Founder/CEO at RATLOG (YC F26). YETI G1 Fellow. Previously Research Intern at Aerospace Institute (Technical University Dresden) working on ESA's Argonaut Moon Lander. Co-founded Innuendo, developing an air-breathing cruise missile powered by RDE. Research Assistant at Fraunhofer IWS on ESA space telescope project.",
        "is_active": true,
        "linkedin_url": "https://www.linkedin.com/in/charlieweise/",
        "x_url": "https://x.com/_charlieweise",
        "avatar_thumb_url": "https://bookface-images.s3.us-west-2.amazonaws.com/avatars/82035ba1fa3819c04cf44c2df2011bd5d26c8507.jpg"
      },
      {
        "user_id": 3173499,
        "full_name": "Matty Driesnack",
        "title": "Founder/COO",
        "founder_bio": "Founder/COO at RATLOG (YC F26). Founding team at Lio (YC S23, a16z), working closely with CEO and COO. MS Business Administration from TU Dresden.",
        "is_active": true,
        "linkedin_url": "https://www.linkedin.com/in/matty-driesnack/",
        "x_url": "https://x.com/MattyDriesnack",
        "avatar_thumb_url": "https://bookface-images.s3.us-west-2.amazonaws.com/avatars/03cd305c416d6b285b67fb6e178047263253fb7d.jpg"
      },
      {
        "user_id": 3682410,
        "full_name": "Felix Kelm",
        "title": "Founder/Engineering",
        "founder_bio": "Founder/Engineering at RATLOG. Previously Electronics Lead at Innuendo, building an air-breathing cruise missile powered by a rotating detonation engine. Developed PCB since age 16. Electrical Engineering at TU Dresden and Telecommunication at INSA Lyon.",
        "is_active": true,
        "linkedin_url": "https://www.linkedin.com/in/felix-kelm-666a00407/",
        "x_url": "",
        "avatar_thumb_url": "https://bookface-images.s3.us-west-2.amazonaws.com/avatars/98f173382ff29f29da37dec1c79babddafe8b170.jpg"
      },
      {
        "user_id": 3682444,
        "full_name": "Paul Kunhart",
        "title": "Founder/CTO",
        "founder_bio": "Founder/CTO at RATLOG (YC F26). Designed rocket engine nozzles for ESA's Argonaut lunar lander at Technical University Dresden's Aerospace Institute. Previously co-founded Innuendo, leading engine design on an air-breathing cruise missile powered by a rotating detonation engine. Studying Aerospace Engineering at TU Dresden.",
        "is_active": true,
        "linkedin_url": "https://www.linkedin.com/in/paul-kunhart-577266392/",
        "x_url": "",
        "avatar_thumb_url": "https://bookface-images.s3.us-west-2.amazonaws.com/avatars/2b491647c0e51e6d70592ca9d0b3c7bbce37073c.jpg"
      }
    ],
    "jobs": [],
    "news": [],
    "launches": [
      {
        "id": 122077,
        "title": "RATLOG: Reusable heavy-lift rockets powered by an engine with 90% fewer parts",
        "tagline": "First engine hot-fired in 4 months for under $30K. $400M in launch reservations signed.",
        "body": "𝗧𝗟;𝗗𝗥: Launch capacity is becoming a bottleneck, so we at RATLOG are 𝘁𝗮𝗸𝗶𝗻𝗴 𝗼𝗻 𝗦𝗽𝗮𝗰𝗲𝗫 with reusable heavy-lift rockets powered by an engine designed to use 𝟵𝟬% 𝗳𝗲𝘄𝗲𝗿 𝗽𝗮𝗿𝘁𝘀 than conventional designs. We built and successfully hot-fired our first engine in 𝗷𝘂𝘀𝘁 𝗳𝗼𝘂𝗿 𝗺𝗼𝗻𝘁𝗵𝘀 and have signed reservation agreements worth $𝟰𝟬𝟬𝗠. Now we are printing an engine with 𝟮𝟬𝟬𝘅 𝘁𝗵𝗲 𝘁𝗵𝗿𝘂𝘀𝘁 for a hot fire in November. If you’re a satellite operator, [reach out to us asap](https://calendar.app.google/xPzyR7iHmEJ3Gt116)**.**\n\n<https://youtu.be/i-RuldD2YHU>\t\n\n𝗣𝗿𝗼𝗯𝗹𝗲𝗺\n\nSatellite operators need to put more mass into orbit than ever, but an available launch slot can be 𝟯–𝟰 𝘆𝗲𝗮𝗿𝘀 𝗮𝘄𝗮𝘆 and cost up to $𝟭𝟱,𝟬𝟬𝟬 𝗽𝗲𝗿 𝗸𝗶𝗹𝗼𝗴𝗿𝗮𝗺. Every delay pushes back the start of operations and revenue.\n\nAs satellite constellations grow and new projects like space stations and orbital data centers take shape, customers need more launch capacity and more options.\n\nAs one European launch broker put it: “𝗜𝘁’𝘀 𝗴𝗼𝗹𝗱 𝗿𝗶𝗴𝗵𝘁 𝗻𝗼𝘄 𝗶𝗳 𝘆𝗼𝘂 𝗵𝗮𝘃𝗲 𝗮 𝘀𝗹𝗼𝘁.”\n\n𝗦𝗼𝗹𝘂𝘁𝗶𝗼𝗻\n\nWe’re building 𝗿𝗲𝘂𝘀𝗮𝗯𝗹𝗲 𝗵𝗲𝗮𝘃𝘆-𝗹𝗶𝗳𝘁 𝗿𝗼𝗰𝗸𝗲𝘁𝘀 𝘁𝗼 𝗰𝗮𝗿𝗿𝘆 𝗽𝗮𝘆𝗹𝗼𝗮𝗱𝘀 𝗼𝗳 𝘂𝗽 𝘁𝗼 𝟮𝟬 𝘁𝗼𝗻𝗻𝗲𝘀, powered by an engine architecture that aims to use 𝟵𝟬% 𝗳𝗲𝘄𝗲𝗿 𝗽𝗮𝗿𝘁𝘀 than conventional designs.\n\nWe’ve 𝗲𝗹𝗶𝗺𝗶𝗻𝗮𝘁𝗲𝗱 𝘁𝗵𝗲 𝘁𝘂𝗿𝗯𝗼𝗽𝘂𝗺𝗽 by using a different method to pressurize the propellants and developed a **new rocket engine cycle** around it.\n\nThis simpler architecture reduces manufacturing complexity and cost, while reusability spreads the cost of the hardware across multiple flights.\n\nThink of it as a 𝗯𝘂𝘀 𝘁𝗼 𝘀𝗽𝗮𝗰𝗲: customers book capacity on a shared flight and pay by the kilogram.\n\n**Team**\n\nCharlie and Paul met through mutual interest in rotating detonation engines for cruise missiles and started a club, then met Felix and Matty.\n\n![uploaded image](/media/?type=post&id=122077&key=user_uploads/3173499/08b61f2e-5027-4a5d-912e-96e7381e9cd3)\n\nFrom left to right\n\n* 𝗙𝗲𝗹𝗶𝘅 𝗞𝗲𝗹𝗺, Chief Avionics Officer: Developed PCB designs since the age of 16.\n* 𝗖𝗵𝗮𝗿𝗹𝗶𝗲 𝗪𝗲𝗶𝘀𝗲, Chief Executive Officer: Previously worked on ESA's Argonaut Moon Lander and space telescope.\n* 𝗠𝗮𝘁𝘁𝘆 𝗗𝗿𝗶𝗲𝘀𝗻𝗮𝗰𝗸, Chief Operating Officer: Founding team at Lio (YC S23, a16z), working closely with CEO and COO.\n* 𝗣𝗮𝘂𝗹 𝗞𝘂𝗻𝗵𝗮𝗿𝘁, Chief Technology Officer: Designed rocket engine nozzles for ESA's Argonaut lunar lander.\n\n**Traction**\n\n* Signed reservation agreements worth $𝟰𝟬𝟬𝗠.\n* Built and successfully hot-fired our first rocket engine in 𝗷𝘂𝘀𝘁 𝗳𝗼𝘂𝗿 𝗺𝗼𝗻𝘁𝗵𝘀.\n* Spoken with 𝟳𝟬+ 𝗽𝗼𝘁𝗲𝗻𝘁𝗶𝗮𝗹 𝗹𝗮𝘂𝗻𝗰𝗵 𝗰𝘂𝘀𝘁𝗼𝗺𝗲𝗿𝘀.\n\n**Ask**\n\n* If you’re building satellites, space stations, or orbital data centers, we’d love to discuss your launch plans. Book a meeting [here](https://calendar.app.google/xPzyR7iHmEJ3Gt116) or reach us at [charlie.weise@ratlog.space](mailto:charlie.weise@ratlog.space).",
        "url": "https://www.ycombinator.com/launches/Vkz-ratlog-reusable-heavy-lift-rockets-powered-by-an-engine-with-90-fewer-parts",
        "votes": 3,
        "created_at": "2026-10-15T15:00:00.047Z"
      }
    ]
  }
]