Forwarded from EverythingTechnology
SpaceX engineer pleads guilty to selling insider trading tips on dark web
https://www.reuters.com/article/idUSKBN2BA2VM?il=0
@EverythingTechnology via Reddit
https://www.reuters.com/article/idUSKBN2BA2VM?il=0
@EverythingTechnology via Reddit
U.S.
SpaceX engineer pleads guilty to selling insider trading tips on dark web
An engineer working for Elon Musk's SpaceX pleaded guilty on Thursday to conspiracy to commit securities fraud by selling insider tips on the "dark web", the U.S. Department of Justice and Securities and Exchange Commission (SEC) said on Thursday.
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NASA, SpaceX Sign Joint Spaceflight Safety Agreement
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Submitted March 18, 2021 at 07:32PM by LcuBeatsWorking
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https://ift.tt/3s2k0Un
Submitted March 18, 2021 at 07:32PM by LcuBeatsWorking
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NASA
NASA, SpaceX Sign Joint Spaceflight Safety Agreement
NASA and SpaceX have signed a joint agreement to formalize both parties’ strong interest in the sharing of information to maintain and improve space safety.
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Elon: First Super Heavy Booster
https://twitter.com/elonmusk/status/1372688191803768840?s=09
Submitted March 19, 2021 at 12:19AM by cac2573
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https://twitter.com/elonmusk/status/1372688191803768840?s=09
Submitted March 19, 2021 at 12:19AM by cac2573
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Twitter
Elon Musk
First Super Heavy Booster
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<b>What is the optimal Starship flip? A trajectory optimization analysis.</b>
Hi everyone! It occurred to me last night that one of the tools I use in my robotics research (I am a PhD student in Mechanical Engineering right now) can be used to analyze/test the Starship landing maneuver. The method falls under a field of control theory called “optimal control theory” which is all about – as the name suggests – using a systematic method to optimize your controller or control signal according to some objective measure.I have been inspired to do this, in part because some internet arm-chair controls engineers in have suggested that issues with the landing maneuver are attributable to (and I am paraphrasing) SpaceX “haven’t tuned their PID parameters correctly yet,” or their trajectory is pitching over too far or something like that. I believe this is a bit of a Dunning-Kruger situation, and in my opinion, comes off a little offensive as it vastly underestimates the knowledge of SpaceX engineers. SpaceX have one of the most advanced aerospace controls and simulation research teams in the world. This analysis may help put into perspective one of the possible methods they use to plan a trajectory or do model-predictive-control (MPC).The MethodDirect collocation is a trajectory optimization method that breaks down the time in which you want to control something into discrete time points and solves a problem that minimizes an objective which is computed across the trajectory (for instance, minimize the total propellant expended for a rocket by integrating the mass burn at each time point in the trajectory, or minimize the total time it takes to complete the task).In specific, I am using a trapezoidal collocation method – as it is the easiest for me to code from scratch in a hurry. All of the code to solve this problem was written from scratch today. The problem I have specified is a bit more restricted and simplified than the actual landing problem.Here are some of the modeling choices I have made:Endpoint ConditionsI have started the problem at the approximate height (500 m) and vertical decent rate (90 m/s) of the Starship at the start of the SN10 landing burn according to some data from a video from FlightClub.io (<a href="https://twitter.com/flightclubio/status/1367556502047793154%5D">tweet</a>). I have started it at a pitch angle of 85 degrees. I have specified that it should land with zero velocity and zero pitch angle. I have allowed the total duration of the maneuver to be whatever it likes so the time interval is not fixed but allowed to be anything from 1 second to 60 seconds total.EngineI have simplified the model to include one centered engine, with a max thrust of 5 MN and a min throttle of 20% or 1 MN. The single engine must be on all the time from the start of the burn. In addition, I have allowed for an aggressive +/- 45 degrees of thrust vector control angle. The engine has no throttle or TVC lag. I have mounted the engine 20 m below the center of mass.Mass DistributionI am assuming Starship is a simple solid cylinder that is 9 m in diameter and 50 m tall weighing a total of 120 tons which is uniformly distributed. I do not include the changing propellant mass due to fuel burn. I do not include the fuel slosh etc.Aerodynamics (or lack thereof)I am ignoring air resistance to simplify things currently (I am an ME after all, not an AE). I realize that assuming the starship is a cylinder with round ends could probably give some decent analytical approximations to air resistance, but that opens a can of worms that I am not interested in eating at the moment. It goes without saying then, but I did not include the flaps in any way. In defense of this, they fold in almost immediately.The objectiveThe objective is to minimize the fuel required in the landing burn. I have simply implemented this as an objective to minimize the total thrust used throughout the maneuver under the assumption that thrust is proportional to mass flow…
Hi everyone! It occurred to me last night that one of the tools I use in my robotics research (I am a PhD student in Mechanical Engineering right now) can be used to analyze/test the Starship landing maneuver. The method falls under a field of control theory called “optimal control theory” which is all about – as the name suggests – using a systematic method to optimize your controller or control signal according to some objective measure.I have been inspired to do this, in part because some internet arm-chair controls engineers in have suggested that issues with the landing maneuver are attributable to (and I am paraphrasing) SpaceX “haven’t tuned their PID parameters correctly yet,” or their trajectory is pitching over too far or something like that. I believe this is a bit of a Dunning-Kruger situation, and in my opinion, comes off a little offensive as it vastly underestimates the knowledge of SpaceX engineers. SpaceX have one of the most advanced aerospace controls and simulation research teams in the world. This analysis may help put into perspective one of the possible methods they use to plan a trajectory or do model-predictive-control (MPC).The MethodDirect collocation is a trajectory optimization method that breaks down the time in which you want to control something into discrete time points and solves a problem that minimizes an objective which is computed across the trajectory (for instance, minimize the total propellant expended for a rocket by integrating the mass burn at each time point in the trajectory, or minimize the total time it takes to complete the task).In specific, I am using a trapezoidal collocation method – as it is the easiest for me to code from scratch in a hurry. All of the code to solve this problem was written from scratch today. The problem I have specified is a bit more restricted and simplified than the actual landing problem.Here are some of the modeling choices I have made:Endpoint ConditionsI have started the problem at the approximate height (500 m) and vertical decent rate (90 m/s) of the Starship at the start of the SN10 landing burn according to some data from a video from FlightClub.io (<a href="https://twitter.com/flightclubio/status/1367556502047793154%5D">tweet</a>). I have started it at a pitch angle of 85 degrees. I have specified that it should land with zero velocity and zero pitch angle. I have allowed the total duration of the maneuver to be whatever it likes so the time interval is not fixed but allowed to be anything from 1 second to 60 seconds total.EngineI have simplified the model to include one centered engine, with a max thrust of 5 MN and a min throttle of 20% or 1 MN. The single engine must be on all the time from the start of the burn. In addition, I have allowed for an aggressive +/- 45 degrees of thrust vector control angle. The engine has no throttle or TVC lag. I have mounted the engine 20 m below the center of mass.Mass DistributionI am assuming Starship is a simple solid cylinder that is 9 m in diameter and 50 m tall weighing a total of 120 tons which is uniformly distributed. I do not include the changing propellant mass due to fuel burn. I do not include the fuel slosh etc.Aerodynamics (or lack thereof)I am ignoring air resistance to simplify things currently (I am an ME after all, not an AE). I realize that assuming the starship is a cylinder with round ends could probably give some decent analytical approximations to air resistance, but that opens a can of worms that I am not interested in eating at the moment. It goes without saying then, but I did not include the flaps in any way. In defense of this, they fold in almost immediately.The objectiveThe objective is to minimize the fuel required in the landing burn. I have simply implemented this as an objective to minimize the total thrust used throughout the maneuver under the assumption that thrust is proportional to mass flow…
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[Elon Musk] Yes, Booster 1 is a production pathfinder, figuring out how to build & transport 70 meter tall stage. Booster 2 will fly.
https://twitter.com/elonmusk/status/1372695421487824903?s=21
Submitted March 19, 2021 at 11:36AM by tonybinky20
via reddit https://ift.tt/3eWcWoE
https://twitter.com/elonmusk/status/1372695421487824903?s=21
Submitted March 19, 2021 at 11:36AM by tonybinky20
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Twitter
Elon Musk
@Erdayastronaut Yes, Booster 1 is a production pathfinder, figuring out how to build & transport 70 meter tall stage. Booster 2 will fly.
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"Looks like a new SpaceX support ship is in town. Shelia Bordelon has a crane on back and will possibly replace Ms. Tree and Ms. Chief for fairing recovery. Looks like they have begun testing/practicing because there is a fairing half on deck. #SpaceXFleet #SpaceX"
https://twitter.com/Kyle_M_Photo/status/1372661451878436865
Submitted March 19, 2021 at 05:21PM by Bunslow
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https://twitter.com/Kyle_M_Photo/status/1372661451878436865
Submitted March 19, 2021 at 05:21PM by Bunslow
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Twitter
Kyle Montgomery
Looks like a new SpaceX support ship is in town. Shelia Bordelon has a crane on back and will possibly replace Ms. Tree and Ms. Chief for fairing recovery. Looks like they have begun testing/practicing because there is a fairing half on deck. #SpaceXFleet…
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[Elon Musk] An orbital propellant depot optimized for cryogenic storage probably makes sense long-term
https://twitter.com/elonmusk/status/1373132222555848713?s=21
Submitted March 20, 2021 at 09:29AM by tonybinky20
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https://twitter.com/elonmusk/status/1373132222555848713?s=21
Submitted March 20, 2021 at 09:29AM by tonybinky20
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Twitter
Elon Musk
@SpacexVision An orbital propellant depot optimized for cryogenic storage probably makes sense long-term
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The current status of SpaceX's Starship & Superheavy prototypes. 21st March 2021 https://t.co/0RpzqVlzWb
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Submitted March 21, 2021 at 08:55AM by brendan290803
via reddit https://ift.tt/3tJOriy
https://ift.tt/2QqKilv
Submitted March 21, 2021 at 08:55AM by brendan290803
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Twitter
Brendan
The current status of SpaceX's Starship & Superheavy prototypes. 21st March 2021
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astro_christina: Common goals, shared vision. NASA astronauts learning about the SpaceX Starship—one element in a growing worldwide field of deeper space exploration systems with sights on the moon and Mars.
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Submitted March 21, 2021 at 09:13PM by CProphet
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Submitted March 21, 2021 at 09:13PM by CProphet
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Instagram
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Interested in the new SpaceX book LIFTOFF? Author Eric Berger and the company's original launch director, Tim Buzza, have stories to tell in our joint AMA!
LIFTOFF: Elon Musk and the Desperate Early Days That Launched SpaceX was published in March 2, and after giving you a few weeks to digest this definitive origin story of SpaceX, author Eric Berger and one of the most important early employees, Tim Buzza, want to give readers a chance to ask follow-up questions.Buzza was a vice president of SpaceX, and the company's first test and launch director. He kept notes and detailed timeline from the time he hired on, in mid-2002, through the early Falcon 9 program.Eric and Tim will begin answering AMA questions at 6pm ET (22:00 UTC) on Monday, March 22!
Submitted March 20, 2021 at 06:59PM by Liftoff_Book
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LIFTOFF: Elon Musk and the Desperate Early Days That Launched SpaceX was published in March 2, and after giving you a few weeks to digest this definitive origin story of SpaceX, author Eric Berger and one of the most important early employees, Tim Buzza, want to give readers a chance to ask follow-up questions.Buzza was a vice president of SpaceX, and the company's first test and launch director. He kept notes and detailed timeline from the time he hired on, in mid-2002, through the early Falcon 9 program.Eric and Tim will begin answering AMA questions at 6pm ET (22:00 UTC) on Monday, March 22!
Submitted March 20, 2021 at 06:59PM by Liftoff_Book
via reddit https://ift.tt/3ccw9AZ
HarperCollins
Liftoff
“A colorful page-turner.” —Walter Isaacson, New York Times Book Review
“As important a book on space as has ever been written.” —Homer Hickam, #1 New York T...
“As important a book on space as has ever been written.” —Homer Hickam, #1 New York T...
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Forwarded from SpaceX Chat (Admin)
ℹ️ SN11 Update
🕐 Last Updated: 14:20 UTC - 22/03
🚀 Launch requires a good static fire first. We are waiting for confirmation on today's static fire.
🗓 The following TFRs which could indicate launch windows have been issued:
- Tuesday March 23rd, 12:00 to 01:00 UTC (Unlimited Altitude)
- Wednesday March 24th, 12:00 to 01:00 UTC (Unlimited Altitude)
- Thursday March 25th, 12:00 to 01:00 UTC (Unlimited Altitude)
🔥 Static Fires:
- Static Fire 1 (Aborted at ignition)
- Static Fire 2 (Appeared nominal)
🚧 Road Closures:
Secondary:
- Tuesday March 23rd, 12:00 to 20:00 UTC (Possible Closure)
Primary:
- Wednesday March 24th, 12:00 to 20:00 UTC (Closure Scheduled)
Secondary:
- Thursday March 25th, 12:00 to 20:00 UTC (Possible Closure)
✅ FAA Approval info
#SN11 @SpaceXChat
🕐 Last Updated: 14:20 UTC - 22/03
🚀 Launch requires a good static fire first. We are waiting for confirmation on today's static fire.
🗓 The following TFRs which could indicate launch windows have been issued:
- Tuesday March 23rd, 12:00 to 01:00 UTC (Unlimited Altitude)
- Wednesday March 24th, 12:00 to 01:00 UTC (Unlimited Altitude)
- Thursday March 25th, 12:00 to 01:00 UTC (Unlimited Altitude)
🔥 Static Fires:
- Static Fire 1 (Aborted at ignition)
- Static Fire 2 (Appeared nominal)
🚧 Road Closures:
Secondary:
- Tuesday March 23rd, 12:00 to 20:00 UTC (Possible Closure)
Primary:
- Wednesday March 24th, 12:00 to 20:00 UTC (Closure Scheduled)
Secondary:
- Thursday March 25th, 12:00 to 20:00 UTC (Possible Closure)
✅ FAA Approval info
#SN11 @SpaceXChat
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@NASASpaceflight: Static Fire! Starship SN11 has fired up her three engines ahead of a test flight (as early as Tuesday), pending good test data (looked/sounded good!)
https://twitter.com/NASASpaceflight/status/1373997275593248769
Submitted March 22, 2021 at 03:05PM by ElongatedMuskrat
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https://twitter.com/NASASpaceflight/status/1373997275593248769
Submitted March 22, 2021 at 03:05PM by ElongatedMuskrat
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Twitter
Chris B - NSF
STATIC FIRE! Starship SN11 has fired up her three engines ahead of a test flight (as early as Tuesday), pending good test data (looked/sounded good!) Status: https://t.co/4WkVsCJMiE Live: https://t.co/cQerCZ0hor https://t.co/AAcI21mQl9
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AMA live now with LIFTOFF author Eric Berger and SpaceX's original launch director, Tim Buzza!
/r/spacex/comments/m9cdrq/interested_in_the_new_spacex_book_liftoff_author/
Submitted March 22, 2021 at 10:59PM by ElongatedMuskbot
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/r/spacex/comments/m9cdrq/interested_in_the_new_spacex_book_liftoff_author/
Submitted March 22, 2021 at 10:59PM by ElongatedMuskbot
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reddit
AMA live now with LIFTOFF author Eric Berger and SpaceX's original...
Posted in r/spacex by u/ElongatedMuskbot • 62 points and 2 comments
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Falcon 9 launch view from Airline cockpit
https://youtube.com/watch?v=Z1GG-glqI1Q&feature=share
Submitted March 22, 2021 at 06:56AM by egoviajero
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https://youtube.com/watch?v=Z1GG-glqI1Q&feature=share
Submitted March 22, 2021 at 06:56AM by egoviajero
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YouTube
Falcon 9 launch from Air
Falcon 9 launch viewed from Airplane cockpit at Flight level 340 #tesla #nasa #spacex #falcon9
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Project Helix - Spatial Organization Concept for SpaceX Starship
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Submitted March 22, 2021 at 06:27PM by elliottruzicka
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Submitted March 22, 2021 at 06:27PM by elliottruzicka
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Orbital Design
Project Helix — Orbital Design
Project Helix is a speculative spatial concept for SpaceX's upcoming human-rated Starship which focuses on practicality, efficiency, and experiential quality.
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[Elon Musk] They are aiming too low. Only rockets that are fully & rapidly reusable will be competitive. Everything else will seem like a cloth biplane in the age of jets.
https://twitter.com/elonmusk/status/1374163576747884544?s=21
Submitted March 23, 2021 at 12:56PM by tonybinky20
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https://twitter.com/elonmusk/status/1374163576747884544?s=21
Submitted March 23, 2021 at 12:56PM by tonybinky20
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Twitter
Elon Musk
@arstechnica @SciGuySpace They are aiming too low. Only rockets that are fully & rapidly reusable will be competitive. Everything else will seem like a cloth biplane in the age of jets.
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Falcon 9 launch of 60 Starlink satellites is targeted for tomorrow, March 24 at 4:28 a.m. EDT from SLC-40 in Florida → https://ift.tt/2Abchxm
https://twitter.com/SpaceX/status/1374455508405424128
Submitted March 23, 2021 at 09:20PM by allenchangmusic
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https://twitter.com/SpaceX/status/1374455508405424128
Submitted March 23, 2021 at 09:20PM by allenchangmusic
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SpaceX
SpaceX designs, manufactures and launches advanced rockets and spacecraft.
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Falcon 9 streaks over the Atlantic with 60 more Starlink satellites at 4:28am this morning.
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Submitted March 24, 2021 at 04:56PM by johnkphotos
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Submitted March 24, 2021 at 04:56PM by johnkphotos
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Forwarded from SpaceX Chat (Admin)
ℹ️ SN11 Update
🕐 Last Updated: 22:15 UTC - 25/03
🚀 SpaceX is targeting Friday 26th for a static fire and flight. Source
🗓 The following TFRs which could indicate launch windows have been issued:
- Friday March 26th, 12:00 to 01:00 UTC (Targeting Flight) 🚀
- Saturday March 27th, 12:00 to 01:00 UTC (Unlimited Altitude)
- Sunday March 28th, 12:00 to 01:00 UTC (Unlimited Altitude)
🔥 Static Fires:
- Static Fire 15/03 (Aborted at ignition)
- Static Fire 22/03 (Video) (Appeared nominal)
🚧 Road Closures:
- Friday March 26th, 12:00 to 00:30 UTC
✅ FAA Approval info
#SN11 @SpaceXChat
🕐 Last Updated: 22:15 UTC - 25/03
🚀 SpaceX is targeting Friday 26th for a static fire and flight. Source
🗓 The following TFRs which could indicate launch windows have been issued:
- Friday March 26th, 12:00 to 01:00 UTC (Targeting Flight) 🚀
- Saturday March 27th, 12:00 to 01:00 UTC (Unlimited Altitude)
- Sunday March 28th, 12:00 to 01:00 UTC (Unlimited Altitude)
🔥 Static Fires:
- Static Fire 15/03 (Aborted at ignition)
- Static Fire 22/03 (Video) (Appeared nominal)
🚧 Road Closures:
- Friday March 26th, 12:00 to 00:30 UTC
✅ FAA Approval info
#SN11 @SpaceXChat
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