Fifth version of the SpaceX medium-lift launch vehicle
Falcon 9 Block 5
On one side is an Falcon 9 carrying theCrew-10 mission to ISS while on the other side is an Falcon 9 carrying theIMAP,SWFO-L1 andCarruthers Geocorona Observatory and spacecraft to Sun-Earth Lagrange point.
The main changes from Block 3 (the original Falcon 9 Full Thrust) to Block 5 are higher-thrust engines and improvements to the landing legs along with numerous other small changes to streamline recovery and re-use offirst-stage boosters and increase the production rate. Each Block 5 booster is designed to fly ten times with only minor maintenance between launches and potentially up to 100 times with periodic refurbishment.
In 2018, Block 5 succeeded the transitional Block 4 version. The maiden flight of the Block 5 launched the satelliteBangabandhu-1 on May 11, 2018. TheCRS-15 mission on June 29, 2018, was the last to be launched on a Block 4 rocket, completing the transition to an all-Block 5 fleet.[10][11]
The Block 5 design changes are principally driven by upgrades needed for NASA'sCommercial Crew program andNational Security Space Launch requirements.[12] They include performance upgrades, manufacturing improvements, and increase the margin for demanding customers.[13]
In April 2017, SpaceX CEOElon Musk said that Block 5 will feature 7–8% more thrust by uprating the engines (from 176,000 pounds-force (780,000 N) to 190,000 pounds-force (850,000 N) per engine).[14] Block 5 includes an improved flight control system for an optimizedangle of attack on the descent, lowering landing fuel requirements.
For reusability endurance:
expected to be able to fly ten times with only minor maintenance between launches[15][16] achieved in 2021[17]
potentially fly up to 100 times with periodic refurbishment[16][15][18]
a reusable heat shield protecting the engines and plumbing at the base of the rocket;
more temperature-resistant cast and machinedtitanium grid fins;[19]
a thermal-protection coating on the first stage to limit reentry heating damage, including a black thermal protection layer on the landing legs, raceway, and interstage;
redesigned and requalified more robust and longer life valves;
Since the debut of Block 5, SpaceX has continued to iterate on its design, manufacturing processes, and operational procedures.[23] Among other changes, the initial Block 5 boosters did not have the redesignedcomposite overwrapped pressure vessel (COPV2) tanks.[24] The first booster with COPV2 tanks was booster B1047 on theEs'hail 2 mission on November 15, 2018, and the second booster using the COPV2 tanks wasCRS-16/B1050, which had its first launch on December 5, 2018.[25] Later Block 5 boosters are also easier to prepare for flight, so SpaceX "prefer to retire" older cores by assigning them to expendable missions when possible.[26]
A pressure relief valve was added to the grid fins’ hydraulic system following a stall that resulted in a landing failure in 2018.[27][28] Similarly, after a booster was damaged at sea in 2022, much of the fleet was upgraded with "self-leveling" landing legs. These legs help ensure the booster can be properly secured to the Octograbber, even in suboptimal sea states.[29]
To improve the rocket's performance, SpaceX has tweaked throttle settings and separation timings.[23][30]
SpaceX CRS-18 featured a Falcon mission-extension kit to the standard second stage, which equipped the second stage with a dark-painted band (for thermal control), extraCOPVs for pressurization control, and additionalTEA-TEB ignition fluid. The upgrades afforded the second stage with the endurance needed to inject the payloads directly into geosynchronous or high energy orbit where the second stage needs hours after launch.[31] Based on mission requirements, they are Medium Coast & Long Coast kits, i.e., the number of helium bottles for pressurization and added batteries for power and other hardware to make sure that the fuel and stages systems operate as long as needed.[32][33]
TheTransporter-7 mission marked the debut of a second stage with aMerlin 1D Vacuum engine with a shorter nozzle extension designed to accelerate production and reduce costs. Unlike the first stage, the second stage on the Falcon 9 is not reused. This variant sacrifices 10% thrust in exchange for a 75% reduction in material usage, primarily the rare metalniobium. As a result, SpaceX can triple its launch frequency using the same amount of this critical resource. Due to its reduced performance, this nozzle is exclusively used on missions with lower performance requirements.[32][34]
The NASA certification processes of the 2010s specified seven flights of any launch vehicle without major design changes before the vehicle would beNASA-certified for human spaceflight, and allowed to fly NASA astronauts.[24][25]
The Block 5 design launched astronauts for the first time on May 30, 2020, on a NASA-contracted flight,Crew Dragon Demo-2.[35] This was the first crewed orbital spaceflight launched from the United States since thefinal Space Shuttle mission in 2011, and the first ever operated by a commercial provider.[36]
^"Falcon 9 & Falcon Heavy". Archived fromthe original on July 21, 2020. RetrievedFebruary 3, 2021.The v1.2 design was constantly improved upon over time, leading to different sub-versions or "Blocks". The initial design, flying on the maiden flight, was thus referred to as Block 1. The final design which has largely stayed static since 2018 is the Block 5 variant.
^"SpaceX Falcon 9 v1.2 Data Sheet".Space Launch Report. August 14, 2017. Archived from the original on November 14, 2015. RetrievedApril 2, 2018.
^abcdef"Fiche Technique: Falcon-9" [Technical data sheet: Falcon 9].Espace & Exploration (in French). No. 39. May 2017. pp. 36–37. Archived fromthe original on August 21, 2017. RetrievedJune 27, 2017.
This template lists historical, current, and future space rockets that at least once attempted (but not necessarily succeeded in) an orbital launch or that are planned to attempt such a launch in the future
Symbol† indicates past or current rockets that attempted orbital launches but never succeeded (never did or has yet to perform a successful orbital launch)
.jpg)
.jpg)
.jpg)
This article incorporates text from this source, which is in thepublic domain.
