This week in SF history— October 12, 1977, ALT-15, first flight of Shuttle without tail cone (https://en.wikipedia.org/wiki/Approach_and_Landing_Tests)Spaceflight news— MASCOT successfully lands on Ryugu’s surface (http://www.planetary.org/blogs/emily-lakdawalla/2018/mascot-landing-on-ryugu-successful.html) — Wonderful images of — Its shadow (planetary.s3.amazonaws.com) — a 3-frame movie of its descent (planetary.org) — a nice image of both the rover/hopper and its shadow (planetary.s3.amazonaws.com) — a surface image showing it reflecting sunlight (planetary.s3.amazonaws.com) — Orbit and operations website (haya2now.jp)Short & Sweet — Changes are being planned for SLS’ upper stage (spacenews.com) — Commercial Crew test flights slip to next year (spaceflightnow.comQuestions, comments, corrections — /u/nerobro clarifies pressure-fed vs autogenously pressurized tanks (reddit.com/r/orbitalpodcast)Data Relay: Combustion Instability — Thanks to Arin Cross for presenting this topic! (linkedin.com) — Historical Perspective of Combustion Instability in Motors: Case Studies* (PDF reader: docslide.net) — NASA Experience with Pogo in Human Spaceflight Vehicles (PDF: nasa.gov) — Apollo 13 had issues with Pogo (youtu.be) — Overview of Combustion Instabilities in Liquid-Propellant Rocket Engines (PDF: core.ac.uk) — Comprehensive Review of Liquid-Propellant Combustion Instabilities in F-l Engines (PDF: gatech.edu) — How NASA brought the monstrous F-1 “moon rocket” engine back to life (arstechnica.com) — F-1 injector diagrams, and an example of different impinging injector setups (heroicrelics.org) — Combustion Instabilities in Solid Propellant Rocket Motors (PDF: dtic.mil) — Lessons Learned In Solid Rocket Combustion Instability (PDF: dtic.mil) — Newspace examples — SpaceShipOne “was a cranky, shuddering, shaking, vibrating motor” (dailymail.co.uk) — SpaceShipTwo possibly suffered combustion instabilities due to the selection of HTPB (telegraph.co.uk)(aviationweek.com) — Treatment of BE-4 suggests it’s had instability issues in the past (spaceflightnow.com) — Rocketlab may be concerned about fuel sloshing (cosmosmagazine.com) — Active damping systems may be viable in the future (PDF: princeton.edu)