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SpaceX Performs Third Attempt of B10/S28 Wet Dress Rehearsal

NASASpaceflight・134 minutes read

Progress is observed in Starship testing, with a wet dress rehearsal completed to prepare for upcoming launches, including potential night launches for improved viewing experiences. SpaceX undergoes thorough testing and modifications for Falcon Heavy development to ensure successful future launches.

Insights

  • SpaceX is preparing for a March launch, expected two to three weeks after a successful wet dress rehearsal.
  • SpaceX is unlikely to develop a vehicle similar to Falcon Heavy with multiple cores, facing challenges and modifications with Falcon Heavy development.
  • SpaceX demonstrates impressive efficiency, loading the ship in under 50 minutes with subcooled propellants, faster than Falcon Heavy, potentially impacting launch procedures and road closures.

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Recent questions

  • What is the purpose of a wet dress rehearsal?

    A wet dress rehearsal is conducted to simulate the entire launch process without actually launching the rocket. This allows SpaceX to test all systems, procedures, and equipment in a realistic setting to ensure everything functions as expected before an actual launch. It helps identify any potential issues or malfunctions that need to be addressed before the rocket is cleared for launch, ultimately increasing the chances of a successful mission.

  • How does SpaceX prepare for a launch license?

    SpaceX prepares for a launch license by conducting successful tests and rehearsals to demonstrate the reliability and safety of their rockets. The Federal Aviation Administration (FAA) requires these tests to be completed before granting a launch license. By following a rigorous testing process, SpaceX can provide the necessary data and evidence to the FAA to prove that their rockets are ready for launch and meet all safety requirements.

  • What is the significance of tower venting during propellant loading?

    Tower venting during propellant loading is a crucial step in the launch process. It indicates that propellant is being loaded onto the rocket, with the tower vent serving as a visual cue for the progress of the loading procedure. Observing tower venting allows SpaceX to monitor the propellant loading status and ensure that the rocket is being fueled correctly and safely. This step is essential for preparing the rocket for launch and ensuring that all systems are functioning properly.

  • Why is a license needed before arming explosives for launch?

    A license is required before arming explosives for launch to ensure the safety and regulatory compliance of the launch operation. The Federal Aviation Administration (FAA) oversees the licensing process for commercial space launches to verify that all safety protocols and regulations are followed. By obtaining a license before arming explosives, SpaceX demonstrates that they have met all necessary requirements and are authorized to proceed with the launch operation in a safe and controlled manner.

  • What is the purpose of deorbit burn test during Coast phase?

    The deorbit burn test during the Coast phase is conducted to simulate the process of slowing down and re-entering the Earth's atmosphere at the end of a mission. This test allows SpaceX to evaluate the performance of the rocket's engines and systems during the critical phase of returning to Earth. By conducting a deorbit burn test, SpaceX can ensure that the rocket can safely navigate the re-entry process and land or splash down in the designated area as planned.

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Summary

00:00

SpaceX Prepares for March Launch Success

  • Propulsion remains normal, R8 chamber pressure is good
  • Tower venting stops, orange flare observed
  • 343 unfolds to go, indicating progress
  • Wet dress rehearsal for next Starship flight deck
  • Venting and activity observed, venting expected to resume for prop load
  • Tower venting stops, prop load on booster anticipated
  • Lock sub coolers and methane sub coolers chilled down
  • SpaceX to review data post-rehearsal for approval
  • License needed before arming explosives for launch
  • Launch expected in two to three weeks post-successful rehearsal, March launch anticipated

17:00

SpaceX Launch Prep: Fueling, TVC, No Fires

  • Launch countdown includes fueling, TVC checks, but no static fires today.
  • Next engine fire expected during first launch attempt.
  • Night launch possibility for IFD 3, likely to maintain morning launch window.
  • Potential FCC filing hints at Indian Ocean splashdown.
  • Deorbit burn test during Coast phase discussed.
  • SpaceX unlikely to create vehicle like Falcon Heavy with multiple cores.
  • Challenges and modifications required for Falcon Heavy development.
  • Tank farm upgrades include additional sub coolers and pumps.
  • Need to replenish liquid oxygen and methane due to boil off during tests.
  • Nitrogen replenishment required for condensing methane and oxygen.

33:11

"SpaceX Testing in South Padre Area"

  • South Padre area is the closest accessible area to view testing from Brownsville.
  • Port Isabel and South Padre are the only accessible areas to watch testing due to road closures.
  • Rocket Ranch Outpost is another recommended viewing spot.
  • Frost rings are being awaited on the ship and booster during testing.
  • Tower vent activity indicates propellant loading on the ship.
  • Frost rings are observed on the ship and booster tanks.
  • SpaceX plans to carry extra oxygen to simulate a payload on the third flight.
  • Scaffolding on the QD arm may be removed after the wet dress rehearsal.
  • Cloud cover hinders visibility of frost rings during testing.
  • SpaceX's mishap investigation revealed the cause of ship failure due to venting excess oxygen.

49:34

"Boosters, Ship Upgrades and Investigation Concerns"

  • A fire caused damage to communication lines and the vehicle, leading to termination.
  • The initial cause of the fire is questioned, particularly regarding pre-existing conditions.
  • Concerns arise about the lack of thorough investigation into the root cause of failures.
  • Issues with boosters experiencing engine failures and unexpected combustion events are highlighted.
  • A comparison is made between loading times for different propellants on boosters.
  • Specific fueling countdown times for Falcon Heavy and Starship are detailed.
  • The efficiency of super heavy boosters compared to SRBs on SLS is discussed.
  • The use of groundside helium to spin start engines on Starship is explained.
  • Upgrades to Booster 10 and Ship 28 include changes to common dome, baffles, heat shield, and more.
  • Ship 28 features improved heat shield, redesigned tile layout, additional stringers, and electric TVC for Raptors.

01:05:37

SpaceX Upgrades for Upcoming Launches

  • Both vehicles, 25 and N, have an upgraded FTS box.
  • Vents are being removed from the ship, with new vents added to the booster.
  • Ship now has only one lock vent on the left side.
  • Upgraded Starlink dishes are on the nose cone, with cowbells added to the top.
  • Ship 29 and Booster 11 have received upgrades.
  • The wet rest rehearsal is part of a licensing process for SpaceX.
  • The FAA requires successful testing before granting a launch license.
  • SpaceX benefits from testing without the constraints of a full launch.
  • SpaceX is preparing for flight 4 with Ship 29 on suborbital pad B.
  • The time between flights 3 and 4 may be shorter due to ongoing preparations.

01:21:19

SpaceX Booster Rollback and Fueling Process

  • A booster was rolled back to the mega bay after an issue in the tank farm.
  • The booster was in the bay for seven days before being rolled out again.
  • SpaceX may not have encountered a major issue as they are attempting the test for the third time.
  • SpaceX tends to stick to the original flight order despite minor setbacks.
  • SpaceX has limited weekend closures for launches, with a theoretical upper limit of 500 hours per year.
  • The tower vent indicated the completion of shipload at 8:34.
  • Methane load on both vehicles was completed at 8:35.
  • The booster locks tank was the last to be loaded, nearing completion.
  • Following the wet dress rehearsal, the next step involves FTS installation and final stacking.
  • The completion of prop load was indicated by the vent starting back up at 8:38, possibly indicating a fully fueled Starship.

01:37:36

"Flight Prep: Cryogenic Bath, Tank Pressurization, Red Team"

  • Ship 29 is undergoing cryogenic bath preparation for flight simulation.
  • Tank farm activity indicates pressurization for final flight preparation.
  • Watch for the death detonation suppression system test and water spray under the pad.
  • JWA gifted 50 red team memberships, showing appreciation for the perks.
  • Observation of frost on the tank suggests fueling completion but with a missing gap.
  • Monitoring for fire ax or Deluge indication, with potential for engine puffing.
  • Wet dress rehearsal ongoing, with no expectation of AES static fire.
  • Engine chill line visible, indicating engine chilling process.
  • Potential countdown hold at 40 seconds, extendable up to 15 minutes.
  • Drone inspection during wet dress rehearsal for observation and potential filming.

01:55:10

SpaceX Launch Delayed, License Pending Review

  • SpaceX will not be ready for a launch late this week, with the earliest potential launch date being around Monday the 11th or the weeks of the 18th or 25th.
  • The launch license is expected to be issued next week after FAA reviews data from today's test with SpaceX.
  • SpaceX may not want to use the deluge system due to limited usage per year and potential confidence in the system.
  • The dry weight of the ship is estimated to be around 140-160 tons, while the booster weighs between 170-180 tons before adding engines and shielding.
  • Activity on the tower at 39A and the installation of a crew arm at the Cape are uncertain, with SpaceX possibly focusing on the second Launchpad in Boca Chica.
  • Signs of DET tanking were observed on the lock tank, indicating a delicate process of propellant transfer.
  • Additional SLO baffles may result in decreased fuel and oxidizer, impacting performance but potentially aiding in vehicle recovery.
  • Ship was loaded in under 50 minutes with subcooled propellants, faster than Falcon Heavy, showcasing impressive efficiency.
  • The chill down of the tank farm took about 2 hours, with prop load starting 52 minutes after the olm vent, totaling around 3.6 hours.
  • The speed of propellant loading raises questions about potential changes in launch procedures, such as road closures closer to launch time.

02:12:11

SpaceX preps for crew launch, Starship progress.

  • SpaceX is currently loading propellant into two vehicles, including a Falcon 9 rocket.
  • The company is preparing for a crew launch, not a Starlink launch, showcasing their capabilities.
  • The wet dress rehearsal of an experimental rocket is ongoing, alongside crew launch preparations.
  • Acknowledgment of the hardworking team behind the scenes enabling these operations.
  • Signs of DET tanking visible on the Starship, indicating progress in the process.
  • Caution is emphasized to ensure everything progresses smoothly to avoid mishaps.
  • Discussion on the potential for a nighttime launch and the reasons behind launch timing.
  • Expectations for the future include potential testing on Ship 29 and Booster 11.
  • Frost on the vehicle is noted to add minimal weight and quickly melts.
  • The likelihood of SpaceX achieving their target of nine Starship launches in 2024 is deemed improbable based on current progress and timelines.

02:29:28

"Starship Booster 14 Prepares for Flight"

  • Booster 14 in the Rocket Garden is awaiting its thrust section, making it flight seven for Starship or flight five of the year.
  • Possibility of having the pair ready for launch by the end of the year, but uncertainties exist.
  • Speculation on reaching nine flights next year with V2 and two Mega Bays operational.
  • Anticipation for the full Star Factory completion this year to increase vehicle production.
  • Improved prop load time from 97 to 46 minutes for recent flights.
  • Frost on tanks possibly indicating DET tanking, with ship shielded from wind.
  • Night launch potential due to wet dress rehearsal timing.
  • Impressive nighttime views of the large Starship rocket.
  • Metal prints of the test available for purchase to support the community and photographers.
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