Featured Image: Ryan Chylinski/Cosmic Perspective
Lift Off Time
|April 20, 2023 – 13:28 UTC | 08:28 CDT|
|Starship Flight Test|
|Orbital Launch Pad, Starbase, Texas, USA|
Where is the spacecraft going?
|Hopefully to space|
Will they be attempting to recover the first stage?
Where will the first stage land?
|It will “land” in the Gulf of Mexico|
Will they be attempting to recover the fairings?
|There are no removable fairings on Starship|
How’s the weather looking?
This will be the:
|– 1st flight of the Starship/SuperHeavy stack|
– 26th mission for SpaceX of 2023
– 230th mission for SpaceX overall
– 1st orbital launch attempt from the state of Texas
– 49th flight of a liquid fueled rocket from the state of Texas
– 61st orbital launch attempt of 2023
Where to watch
Tim Dodd, the Everyday Astronaut, will be streaming on launch day; come ask questions and join the conversation live!
What’s All This Mean?
After years of prototype testing, crash landings, and explosions, the Super Heavy booster and Starship second stage are ready for the inaugural flight. This test flight will pave way for future missions to the Moon and Mars, but first, SpaceX must get Starship off the ground.
Due to the nature of this test flight, the launch date and time are fickle and subject to great change as SpaceX will take all precautions necessary to ensure Starship/SuperHeavy collects as much data as possible during its flight.
The vehicles set to perform this inaugural test flight are Booster 7 and Ship 24. The last ship to complete a test flight was SN15, which survived its short suborbital test hop. All of the prior ships and boosters are detailed in the History section of this article. For a comprehensive log of all testing done on Ship 24 and Booster 7, check out our Starship Orbital Launch Timeline Checklist [S24 and B7] | Live Updates article!
Starship Flight Test
With the first flight of a fully stacked Starship/Super Heavy comes various objectives and challenges. The end goal of this mission is for Ship 24, also known as “Starship” or the upper stage, to successfully reenter the atmosphere and land about 100 km (62 mi) off the coast of Kauai. Kauai is an island in the Hawaiian islands chain located in the Pacific Ocean. Currently, there is no known payload on Ship 24; the payload bay door has been welded shut.
After stage separation, Booster 7 will perfrom a boostback burn and attempt a soft water landing in the Gulf of Mexico. If Ship 24 makes it to reentry, it will not attempt a soft water landing; meaning it will not splash down under the power of engines.
Recently posted exclusion zones and other notices give a greater indication of the trajectory that Starship will take. It will fly slightly South of East, just over the northern tip of Cuba. Starship will then travel across the southern Atlantic Ocean and pass over Namibia before traveling over the Indian Ocean. The final piece of land Starship is expected to pass over is Indonesia before heading out over the Pacific Ocean, and reentering near Hawaii.
In the days prior to launch, Ship 24 will be placed on top of Booster 7 via the chopstick arms, also known as Mechazilla. Once on top, the arms will release and open wide near the top of the tower in order to get as far away from the stack as possible. These chopstick arms are designed to catch both the booster and ship on future missions.
In the weeks after the 31-engine static fire and leading up to launch, SpaceX has been installing enhanced shielding on the Orbital Launch Table in order to provide better protection during launch. There is no flame diverter, unlike on other launch pads, so the exhaust from all 33 engines will be able to spread in all directions.
The closest in-person viewing point is expected to be on South Padre Island about eight kilometers (five miles) away. Despite uncertainties in the exact dimensions of the exclusion zone, it will be large due to the size of Starship/SuperHeavy and the fact that it is an unproven rocket.
If attending in person is not an option, Everyday Astronaut will be live on location from Studio B with views all around the island and pad. Tim will be available to answer questions. A livestream link can be found here once we get closer to launch.
SpaceX is also expected to have an official live stream.
For the past seven years, SpaceX has been developing their facility in Boca Chica, Texas. They have dubbed it “Starbase” and it contains tents, bays of various heights and widths, as well as all the infrastructure to produce the world’s largest and most powerful rocket. Information on the test campaign and the construction of Ship 24 and Booster 7 can be found in the “History” section below.
The full stack consists of two vehicles, each with different jobs relating to the launch process. On the bottom is the booster, also known as Super Heavy, which makes up about 58% of the full stack. The orbital ship rests on top of the booster to enable easy separation during staging.
The booster, or bottom part of the rocket, is powered by 33 Raptor 2 engines formed in a series of rings standing 69 m (230 ft) tall. To fuel all 33 engines, uses a liquid oxygen (LOx) tank and a methane (CH4) tank on the bottom and top, respectively. The booster is fueled by the Booster Quick Disconnect (BQD) which is located on the Orbital Launch Table and connects to the booster near the bottom.
Shortly before the booster experiences first motion, the BQD retracts and a protective door rapidly shuts in order to prevent the connections from getting blasted by rocket engine exhaust. Near the bottom of the booster are four elongated triangular chines. Each of these contain Composite Overwrapped Pressure Vessels (COPVs). The COPVs provide helium and other gasses for engine start up and other functions on the booster. The square trapezoidal pyramids mainly contain electronics units.
On the top of the booster are four grid fins which provide control during booster descent through the atmosphere. These work similarly on the Falcon 9, however are much larger on Super Heavy.
All 33 sea-level Raptor 2 engines are arranged in three clusters or rings. The three inside engines form a triangle and have the ability to gimbal. The next ring contains 10 engines which also have the ability to gimbal. Finally, the outer ring contains the remaining 20 engines that do not have the ability to gimbal.
The Ship, or top part of the rocket, is powered by three sea-level Raptor 2 engines, and three vacuum optimized Raptor 2 engines, and stands 50 m (160 ft) tall. The three vacuum optimized engines have elongated bells to adapt to the lack of air pressure in space. To learn more about Raptor engine development, check out Everyday Astronaut’s video “How SpaceX Is Upgrading Raptor To Be The Ultimate Rocket Engine!“
On the bottom of the ship is a skirt which encloses the engines and provides a structural element for the booster and ship to connect. Unlike the Falcon 9, the interstage section on starship is on the ship and the top of the booster is the top bulkhead. During stage separation, the booster will perform a kick and flip maneuver to separate the ship from the booster. Using the inertia of the kick from the booster, the ship will separate and then ignite all six engines to continue on its path to orbit.
The bigger of the two sets of flaps, the aft flaps can work in conjunction with the three center mounted sea-level engines that gimbal, to orient the ship during entry and landing. On the top of the ship are the slightly smaller forward flaps that also aid in ship orientation during descent and landing.
About two-thirds of the way up the vehicle is the payload bay. Designed for Starlink satellites, there is a narrow door that deploys one satellite at a time. Sometimes called the “PEZ dispenser,” named after the popular candy, the internal structure of the payload bay is specially designed to deploy Starlink satellites in this manner.
All Times Approximate
|02:00:00||SpaceX Flight Director Conducts Poll and Verifies Go for Propellant Load|
|01:39:00||Booster LOX (Liquid Oxygen) Load Underway|
|01:39:00||Booster Fuel Load (Liquid Methane) Underway|
|01:22:00||Ship Fuel Load (Liquid Methane) Underway|
|01:17:00||Ship LOX Load Underway|
|00:16:40||Raptor Begins Engine Chill on Booster|
|00:00:40||Fluid Interfaces Begin their Ventdown Sequence|
|00:00:08||Raptor Startup Sequence Begins|
FLIGHT TEST TIMELINE | BEST CASE SCENARIO
Completion of the milestones below are not required for a successful test, but each milestone completed will certainly make for an exciting test. All times approximate.
|00:00:55||Max Q (Moment of Peak Mechanical Stress on the Rocket)|
|00:02:49||Booster Main Engine Cutoff|
|00:03:11||Booster Boostback Burn Startup|
|00:04:06||Booster Boostback Burn Shutdown|
|00:07:32||Booster is Transonic|
|00:07:40||Booster Landing Burn Startup|
|00:08:03||Booster Landing Burn Shutdown|
|00:09:20||Starship Engine Cutoff|
|01:28:43||Starship is Transonic|
Starship Program History
For nearly all of its lifetime, the Starship program has resided in south Texas, at Starbase. The area where Starbase resides has progressed through many names over the past decades. The town where Starbase is located was originally called Kennedy Shores. After a hurricane it was renamed Kopernik Shores, and most recently known as Boca Chica.
Originally purchased in 2014, the land in the area of Boca Chica gradually fell into SpaceX’s hands. For the next four years, progress was fairly dormant, despite some occasional ground work. In 2018, a water tower-like structure first stood on the paper-flat landscape. This “water tower” would be later known as Starhopper, a Raptor engine test vehicle.
Starhopper flew untethered for the first time on July 25, 2019 under the power of one Raptor engine serial number six to a height of 20m (65 ft). A little over a month later, Starhopper would fly for the second and final time, reaching a height of 150m (500 ft). The main purpose of Starhopper was as a Raptor flight test vehicle. Presently, Starhopper remains at the launch site, covered in speakers, cameras, and other communication and monitoring equipment.
Two more test vehicles would fly to a height of 150m (500 ft), SN5 and SN6. However, before these two successes came a spectacular malfunction of SN4. While conducting a static fire test, SN4 suffered an explosion, or a rapid unscheduled disassembly, which quickly ended it’s testing career. SN5 and SN6 would launch a year after Starhopper, about one month apart.
At this point, SpaceX transitioned to higher flights which would utilize three Raptor engines and aimed to test the belly flop, flip, and landing maneuver. The first Starship to attempt this maneuver would be SN8, which launched on December 9, 2020 and flew to an altitude of 12.5 km (41,000 ft). Flying for a total duration of six minutes, 42 seconds, the flight concluded in SN8 crashing on the landing pad. A sudden pressure loss in the methane header tank caused the engines to stop producing thrust, resulting in a rapid unscheduled disassembly of the vehicle.
SN9 would be next up in line to attempt a successful landing. SN8 had already proved that Starship could perform a belly-side-down dive, relight it’s engines, and (partially) flip over. During construction, SN9 fell over in the High Bay which caused concern for its structural integrity. SN9’s flight was the same as SN8, however, it only traveled to 10 km (33,000 ft) in altitude. Upon landing, one of it’s three Raptor engines failed to relight resulting in an over rotation of the vehicle. SN9 landed at a slight angle and exploded on the landing pad.
SN10’s flight came with an emotional roller coaster. As it’s predecessor did, SN10 flew to 10 km (33,000 ft) and performed is descent maneuver as designed. The flip and engine relight went smoothly, but a hard touchdown damaged the skirt and fragile landing legs. After standing poised on the landing pad, about eight minutes later, SN10 also exploded in a massive fireball.
Explosion and Success
SN11 still remains a large mystery. Due to the abnormally dense and low lying fog, the entire flight was entirely obscured, leaving the only evidence of flight to the in-person observer, the sound, and a still image captured by Trevor Mahlman. Upon landing and relight, SN11 rapidly exploded scattering debris across the area around starbase for miles. The only visuals of this explosion were from ground based cameras that saw debris falling from the sky.
Finally, SN15 was the first Starship prototype to fly to 10 km (33,000 ft), dive down on its belly, flip, and land successfully. The prototypes between SN11 and SN15 allowed for necessary upgrades which enabled a successful landing. While a small fire ignited underneath the vehicle, it was quickly extinguished allowing SN15 to live on. Currently, SN15 sits with other vehicles in the Rocket Garden.
Although SN15, which flew almost two years ago in May 2021, was the last flight from Starbase, testing and rapidly accelerated construction has progressed and changed the landscape. Some highlights of this construction include the completion of the Orbital Launch Tower and Orbital Tank Farm. Both of these elements, in conjunction with the Orbital Launch Table, are essential parts of Stage Zero. Stage Zero is, simply put, the launch pad and supporting equipment that enables an orbital launch.
As far as rockets go, SpaceX tested BN3 (Booster Number 3) marking the first static fire of a booster prototype on July 19, 2021. BN3 was quickly scrapped a month later, but paved the way for B4 (Booster 4), which never performed a static fire test, but was part of the first full stack of the Starship/SuperHeavy launch system.
These previous boosters, along with B5 that never saw testing, paved the way for Booster 7 and Ship 24 to conduct the first orbital flight test. Each explosion, successful landing, static fire test, cryogenic proof test, and even simple rollouts to the pad have allowed SpaceX to test critical elements in preparation for orbital flight. As the predecessors did for B7 and S24, the pair will gather data on orbital flight to enable further success on future orbital launch attempts, regardless of the outcome.