Quote from: cppetrie on 03/31/2017 12:08 amQuote from: TrevorMonty on 03/31/2017 12:03 amThought they had shelved 2nd stage reuse for F9. Looks like is back on the todo list. We only have what has been posted by CG, and that doesn't indicate reusable 2nd stage for F9 but just that it is next on the list of capabilities to develop to achieve their ultimate goal.Some more context in Jeff Foust's tweet:Quote from: https://twitter.com/jeff_foust/status/847599210513944577Musk adds it might “fun to try a Hail Mary” and recover an upper stage.
Quote from: TrevorMonty on 03/31/2017 12:03 amThought they had shelved 2nd stage reuse for F9. Looks like is back on the todo list. We only have what has been posted by CG, and that doesn't indicate reusable 2nd stage for F9 but just that it is next on the list of capabilities to develop to achieve their ultimate goal.
Thought they had shelved 2nd stage reuse for F9. Looks like is back on the todo list.
Musk adds it might “fun to try a Hail Mary” and recover an upper stage.
QuoteEDIT: The stage must be re-entering at an angle to affect the grid fins so differently.Yes, we've seen that asymmetry on photos of recovered stages, where the white paint on the interstage above one of the grid fins has been blasted off by the TPS coming off the grid fin, but the white paint remains intact on the opposite side of the interstage.
EDIT: The stage must be re-entering at an angle to affect the grid fins so differently.
Quote from: Kabloona on 03/31/2017 12:51 amQuoteEDIT: The stage must be re-entering at an angle to affect the grid fins so differently.Yes, we've seen that asymmetry on photos of recovered stages, where the white paint on the interstage above one of the grid fins has been blasted off by the TPS coming off the grid fin, but the white paint remains intact on the opposite side of the interstage.Maybe they need to BBQ roll the stage for the high heat part of the descent?
Can anyone offer a suggestion for the least laggy streaming site? I've tried SpaceX, Youtube, Ustream with varying results.
Quote from: Lar on 03/31/2017 01:25 amQuote from: Kabloona on 03/31/2017 12:51 amQuoteEDIT: The stage must be re-entering at an angle to affect the grid fins so differently.Yes, we've seen that asymmetry on photos of recovered stages, where the white paint on the interstage above one of the grid fins has been blasted off by the TPS coming off the grid fin, but the white paint remains intact on the opposite side of the interstage.Maybe they need to BBQ roll the stage for the high heat part of the descent?Thaicom 8 (another GTO mission) was rock-steady throughout the descent. They seem to be very tightly roll-controlled during the whole launch and landing.
I'm saying maybe they might want to change that... induce a deliberate roll. But that makes the control algorithms more complex I expect.
Quote from: Lar on 03/31/2017 01:36 amI'm saying maybe they might want to change that... induce a deliberate roll. But that makes the control algorithms more complex I expect.I would think you would want to avoid inducing roll for fear of centrifuging fluids in the grid fin hydraulics (leading to loss of control) or inducing slosh as well as centrifuging in the propellant tanks. That could cause issues with restart for the landing burn.
Probably no titanium 3D printer big enough. Anyway, large metal 3D printing is expensive, has inferior surface finish, and produces lower strength than a forging. Forging is better especially if you'll be making several copies (SpaceX will make at least 100 of them).
debut of Roomba
Looked like the grid fin on the right was getting a good cooking before the feed cut.
Quote from: dglow on 03/30/2017 09:17 pmdebut of RoombaIs the above true? I have not seen evidence it was used
