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New Satellite Engine Could Use Earth's Atmosphere to Stay in Orbit Indefinitely

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  1. Saving Jet Fuel

    A step‑by‑step tutorial showing how to use the open‑source scikit‑decide framework together with the OpenAP aircraft performance model to compute fuel‑optimal flight trajectories. The post details the author’s high‑end workstation, installs Python 3.12, scikit‑decide, OpenAP, and DuckDB with several extensions, then explores OpenAP’s aircraft data (e.g., A380‑800 specs and drag polar) and demonst…

    Hacker News front pagemarksblogg.com26 minHN13876
  2. Rufus-Air: An Open LLM Post-Training Recipe

    Rufus‑Air presents a fully open, reproducible eight‑stage post‑training recipe for the 106‑billion‑parameter GLM‑4.5‑Air‑Base model, detailing data, reward design, and engineering choices. The pipeline—starting with diverse SFT and progressing through staged RL and RLHF—outperforms the official GLM‑4.5‑Air release and matches similarly sized open models.

    Hugging Face Daily Papersarxiv.org1 minpaper