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A couple of failures on Flight 1 and two on Flight 4.Then comes Raptor 3, which, based on pictures from SpaceX, is in the East bay of the Raptor Vertical test stand at McGregor, Texas. This engine is slated to have 280 metric tons of thrust and drastically reduce the weight needed to support it. The engine is slated to be 1,525 kg and, with added vehicle-side components, 1,720 kg.30 second test on the vertical test stand at the SpaceX McGregor test site, we believe this is the first test of the Raptor 3 engine. @NASASpaceflightMcGregor Live 24/7 pic.twitter.com/GlUnQ7AU8Y— Elisar Priel (@ENNEPS) August 8, 2024As stated before, SpaceX can make it much lighter by removing heat shields. Looking at Raptor 3, it looks to be in two separate parts: a low-pressure side that still has flanges and seals and a high-pressure side on the bottom with no flanges. Removing flanges and those seals will allow SpaceX to run the engine at higher and higher pressures, which results in more thrust coming out of the engine.It is unclear when this engine will be placed on a vehicle. SpaceX probably still needs more testing now that the design is somewhat finalized. As an added bonus, SpaceX Chief Operating Officer Gwynne Shotwell treated everyone to an amazing picture of Raptor 3 SN1 Static fire at McGregor.Works pretty good for a “partially assembled” engine 🙂 pic.twitter.com/UkHkGyoOY7— Gwynne Shotwell (@Gwynne_Shotwell) August 8, 2024Flight 5 and 6 newsShip 30 did more engine testing this past week with a spin prime. This was required if another Raptort Vacuum Engine was swapped out, and R398 was swapped for R384. It is unknown why SpaceX swapped this engine out. This time around, teams only completed a spin prime, as happened with Ship 28 after one of its Raptor Vacuum engines was swapped. Ship 30 at Masseys Flame Trench (Credit: Jack Beyer for NSF/L2)Ship 30 is back at the production site and on a ship transport stand. This ship should be getting its final touches, barring another engine change. Teams will finish the heat shield work and other final line items until Orbital Launch Pad A becomes available. Once out at the pad, Booster 12 and Ship 30 can complete a Wet Dress Rehearsal; however, it is unknown when or even if this will happen or how close to launch such a thing will be.Regarding the readiness for Flight 5, SpaceX posted on social media that both Flight 5 vehicles are ready pending regulatory approval. This follows the just-completed spin prime Ship 30. Both Ship 30 and Booster 12 could be ready, but in the past, SpaceX has said this when, in fact, neither vehicle was actually ready for flight.SpaceX
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As Booster 11 touched down softly in the Gulf before tipping over – even though one of the 13 engines failed to reignite for landing. Based on comments from Elon Musk after the flight, SpaceX may choose to attempt a catch on the next mission.Further changes to the flight profile included the jettison of the hot staging ring just after the end of the boostback burn. The hot stage ring allows the exhaust of the ship’s engines to be safely directed away when they ignite while still attached to the booster.The hot stage ring on the flight four stack. Credit Mary (@bocachicagal) for NSFSince the ring features heavy shielding, it adds a considerable amount of mass to the booster. This is why SpaceX has opted to jettison the ring to increase the chances of booster landing success during this test phase. When it debuts at a yet-unknown date, Starship V2 will feature a much lighter hot stage ring permanently fixed to the forward end of the booster.The propellant transfer and the opening of the payload door, which were present on the last flight, were not included on this flight. According to SpaceX, the propellant transfer demo was successful on the last mission, while the payload door test is most likely seen as non-critical for this mission, and SpaceX refocused on the recovery of the vehicles.Booster 11The booster featured 33 Raptor engines, which were tested in a static fire test on April 5.The booster was similar to its predecessor, featuring updates to ensure a successful return to the designated landing zone. This included redundancy updates to blockage prevention, which most likely meant changes to the internal filter system that filters liquid oxygen and liquid methane to prevent solid matter from being pulled into the engines.Including the hot staging ring, the booster stands 71 meters tall, with a primary diameter of nine meters, not including the chimes or stainless steel grid fins. It can hold up to 3,400 tons of propellant, although SpaceX has not fully loaded the vehicle on these test flights.All 33 Raptor engines start up at liftoff in a staged ignition, producing up to 7,590 tons of force.At the top of the booster, below the hot staging ring, are the four stainless steel grid fins used to guide the booster at the later parts of the landing. In contrast to Falcon 9, SpaceX removed the ability to deploy and
