Saturday, February 10, 2018

Main Sequence Notes - 2/11/2018

New Notes
Week of 12/23/2017 - Holiday Special
rip old notes🙏
Press f to pay respects

Segment I

Industry News

the extra cool important shit
FALCON HEAVY LAUNCH!!1!
Rough Notes (things not to forget to mention)
  • Cool as hell
  • Side boosters landed simultaneously
  • Core booster crashed into the water at ~300 mph/500 kph about 100 m from the ASDS, and damaged 2 of its engines (ASDS = Autonomous Spaceport Drone Ship)
  • Elon’s 2009 red (uh, midnight cherry actually) Tesla Roadster is on track for a Mars flyby
    • People mistakenly were saying it was a 2018 model roadster which 1 does not exist (they're making one in 2020 tho) and 2 it was an 09 lol
  • The thing worked damn beautifully
Notes regarding stuff not necessarily FH (info taken from press conf.)
^ press conference q&a (not cringey, very informative)
  • Block 5 is gonna be the last version of Falcon 9/FH, it will be rolled out soon
  • Center core of FH has to take about ~1M lb of additional loads from the side cores
  • Elon estimated the total investment into FH at ~$500M, probably more
  • Falcon Heavy should have no problem getting national security missions given the number of launches already planned
  • BFR spaceship hover flights might come as early as next year (!!) similar to Grasshopper
  • Starman’s spacesuit is a production model (actually one of the qualification articles), but was not instrumented (although Elon said “you can just jump in a vacuum chamber with it and it’d be fine”); the spacesuit took about 3 years to design and make
  • Elon said “suggestions are welcome” for BFR’s dummy payload
  • Fairing recovery has proven surprisingly difficult - Elon thinks they can have it down in 6 mo; there is a special boat, like a catcher’s mitt (Elon said that they could use the same boat to catch Dragon lmao)
  • Now that FH/Falcon block 5 is done, the absolute priority is crew Dragon; the goal is to fly astronauts at the end of this year (ofc that is in Elon time)
  • The titanium grid fins were the most important thing recovered from the FH launch
Elon’s reaction to the launch (from behind the scenes footage)
Stuff about the car:
  • SpaceX has no plan to really track the Tesla - battery lasted about 12h after launch


Govsat-1 booster (probably) destroyed by USAF
  • Last week we discussed the Govsat-1 first stage booster that splashed down into the ocean and survived (unexpectedly)
  • Elon Musk confirmed on twitter that it was a test for a high retro thrust landing that could potentially be done on the drone ship
    • They decided to test it without the drone ship so there was no risk of ruining the boat
  • SpaceX did not expect the rocket to survive the test and most likely did not have a backup plan for if the booster did survive
  • Trusted anonymous sources confirmed that the US air force destroyed the booster via an airstrike (<-- the article says this is incorrect as of 2/9/18, SpaceX issued a statement denying USAF involvement and said that the rocket “broke apart”)
  • Article with correction ^
  • Elon did state on twitter that they would try to tow it back to land, however this could have been too dangerous for a couple of reasons:
    • Un-safed COPV’s (composite overwrapped pressure hvessels [basically a tank full of scary ass rocket chemicals wrapped in carbon fiber {hence the ‘composite’}])
    • These tanks at flight pressure (the state the tank is in while in flight) can be very dangerous to work with
    • Onboard electronics that control the pressure of the COPV’s could have been ruined by seawater upon splashdown making it impossible for the vehicle to safe its tanks

Company News/Ads
Company Ads

Sponsored Content:
Main Sequence is brought to you by the following sponsors:
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  • Ok now for our actual sponsors:
    • Teespring!
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    • Thanks to all our supporters & fans!



Industry News (Continued)

Topics that are less breaking news and more quick glance
The Stock Market Scare and why Apogee Industries is unaffected
  • Well um.. We don't really have stocks so there's that

Segment II

Non-News Bits
This Week in History
Skylab mission ends this week in 1974
  • It was inhabited for 171 days across 3 missions
  • The station deorbited on July 11, 1979
3rd lunar landing (Apollo 14)
  • Alan Shepard hit 2 golf balls
First signals bounced off of venus
  • Today in 1958
  • Radar signals sent to Venus bounced off and made it back to earth
  • Used a device called a maser (microwave amplification by stimulated emission of radiation)
  • Helped define the size of an astronomical unit (signals were also sent to the sun)
  • More on this here


Cool Tech With Jonah
notes go here
Onn mini Bluetooth Keyboard

  • Rubber keys (probably membrane switches)
  • Works across ios android and windows
  • Charges over micro usb
  • 5.90 x 0.30 x 4.50 Inches
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