Ship 25 (S25)

Ship 25 (S25) is a Starship second stage prototype. It flew with Booster 9 (B9) on the second integrated test flight (IFT-2). Ship 25's testing campaign began in late October 2022. In May 2023, the testing campaign continued at the Massey's test site as the first ship prototype. In June, testing continued back at the launch site, despite being somewhat outdated compared to the newer prototypes.

S25 is the first ship to have used hot-staging. This means that the ship's engines are ignited while it remains attached the booster. The vacuum Raptors are ignited first, followed by the sea level Raptors to avoid them directly thrusting onto the hot staging ring. Per Elon Musk, using this method the payload capacity is increased by 10%.

Ship 25 is the first ship that has been in space, having reached an altitude of 149 Kilometers, surpassing the Karman line.

For full stack testing see Starship 9/25.

## Timeline

Click to view the timeline:

* 14 February 2022: S25 fwd dome sleeve outside tents (3-ring).
* 15 February 2022: S25 nosecone barrel section spotted (5-ring).
* 16 February 2022: S25 common dome section spotted.
* 05 March 2022: S25? common dome section in tent.
* 06 March 2022: S25 common dome section/segment and another nosecone spotted in same tent.
* 09 March 2022: S25 aft dome sleeve prepared for flipping (4-ring), flipped.
* 10 March 2022: S25 aft dome spotted, lifted onto sleeving stand; sleeved with 4-ring sleeve [flipped yesterday]; lifted of stand.
* 04 April 2022: Ship aft section moved into tent 3 by a crane (likely S25 aft section).
* 12 April 2022: S25 5-ring nosecone barrel section spotted in front of tent; S25 nosecone barrel stiffener removed, then moved into wind break (low bay); S25 aft section spotted in tent.
* 01 November 2023: S25 re-stacked on B9 for unkown reasons.
* 02 November 2023: S25 de-stacked from B9, presumably for FTS installation.
* 09 November 2023: S25 re-stacked on B9.
* 11 November 2023: Ship 25 destacked from Booster 9.
* 15 November 2023: S25 re-stacked on B9
* 16 November 2023: S25 destacked off of B9 following a grid fin actuation failure.
* 17 November 2023: S25 re-stacked on B9 following replacement of grid fin actuators.

## Testing Campaign

### 28 October 2022 - Ambient Proof Test

Timeline according to LabPadre discord:

* 08:32 Road closed
* 09:32 Pad cleared
* 10:31 S25 venting its tanks
* 13:11 Cars to pad
* 13:21 Road opened

### 01 November 2022 - Cryo Proof Test

Timeline according to LabPadre and NSF streams:

* 09:00 Road closed
* 09:33 Pad clear
* 09:34 Grass vent
* 10:07 SoLS tank farm started to vent (slight vents earlier)
* 10:28 Cars to pad
* 10:46 Pad cleared again
* 11:00 OLS CH4 subcoolers frost started to form
* 11:17 SoLS tank farm spooled up, together with grass vent
* 11:39 Venting from OLS CH4 side increased
* 11:45 Cryo load on LOX tank started, CONDENSATION started to form (not gradually but, whole hight of tank at the same time)
* 11:50 LOX tank small frost ring started to form
* 12:07 OLS tank farm venting on CH4 side stopped; frost on LOX tank at the left half started to increase
* 12:28-44 OLS tank farm venting on CH4 subcooler top - but not getting frosty yet
* 12:46-13:02 CH4 subcoolers top restarted, slowly getting frosty now
* 13:07-28 Only right CH4 subcooler active
* 13:20 Condensation on LOX tank increased again; SoLS LN2 tank started venting agian
* 13:44 Frost on CH4 tank started to form
* 14:32-33 Depress vents on LOX and CH4 tanks (facing sideways)
* 14:40 Cars to pad (S24 still frosty)
* 14:46 Road opened

### 02 November 2022 - Cryo Proof Test

Timeline according to LabPadre and NSF streams:

* 08:56 Road closed
* 09:10 or earlier (fog): Minor SoLS tank farm venting
* 11:08 SoLS tank farm venting started a lot, Grass vent
* 11:19 Venting decreased
* 11:40 LOX tank frost ring started to form
* 12:08 Tank farm activity (near recondenser) picked up again
* 12:40 Frost on LOX tank nearly 3 rings high; condensation started to form above the frost line
* 12:58 Nosecone header tank slightly venting
* 13:30 LOX tank fully frosty (but likely only half filled)
* 15:16 Condensation on CH4 tank formed (only very small ring)
* 15:25 Double depress vents from both tanks; CH4 vents continued; grass vent restarted
* 15:29 SoLS tank farm active agai
* 15:30 Condensation started to form above the frost line on CH4 tank
* 16:05 Condensation started to decrease
* 16:23 Depress vents from both tanks
* 17:45 Cars to pad
* 17:53 Road opened

### 07 November 2022 - Cryo Proof Test

Today, B7's CH4 tank was cryo testes, as well as S25's LOX. tank

Testing timeline according to LabPadre and NSF streams:

* 08:03 Road closed
* 08:43 Pad cleared
* ---B7 testing - See Starship 7/24
* 13:15 SoLS grass vent
* 13:23 Activity at SoLS started for S25 testing
* 13:53 S24 LOX tank frost started to form
* 15:08 LOX frost around 3 rings high
* 15:09 Condensation started to form on rest of LOX tank
* 15:58 LOX tank fully frosty
* 16:48 FIREX tested at OLM
* 17:48 Depress vents
* 18:42 Road opened

### 08 November 2022 - Roll Back

Timeline according to LabPadre discord:

* 05:16 LR11000X attached to S25
* 09:54 S25 lifted off SoLS pad A by LR11000X
* 10:05 S25 touched down on transport stand
* ---S24 destack operations, see Starship 7/24
* 15:16 LR11000X detached from S25
* 15:40 S25 started to move
* 16:02 Entered hwy 4
* 17:06 Arrived at production site
* 17:20 Entered high bay

### 14 January 2023 - Roll Out

Timeline according to LabPadre discord:

* 06:09 S25 left high bay
* 08:07 Left construction site
* 08:53 Arrived at launch site

### 17 January 2023 - Lifting

Timeline according to LabPadre discord:

* 03:34 S25 attached to LR11000X
* 07:25 Lifting started
* 07:58 Touched down on Pad B

### 05 May 2023 - Cryo Proof Test

SpaceX conducted a cryo proof test of S25 (and S26.1) at Massey's test site. Both tanks frosted up during the test.

### 14 June 2023 - Cryo Proof Test / Spin Prime Abort

SpaceX conducted a cryo proof test with propellant and possibly intended to conduct a spin prime test. However, they didn't spin prime test the engines and about 32 minutes after engine chill, depress started.

Timeline according to LabPadre and NSF streams:

* 12:06 Road closed
* 13:29 S25 venting
* 12:42 Pad clear
* 14:12 Car to pad (border patrol?)
* 14:44, 51 Minor grass venting started
* 14:53 Some venting from recondenser area started
* 14:58 Grass vent; Tank farm venting started (SoTF)
* 15:10 Possibly some minor condensation started to form at bottom of LOX tank
* 15:17 Vent near pad base started
* 15:21 More venting around the pad, engine chill lines getting frosty (there are two such lines)
* 15:32 Engine chill line frost disappeared; reappeared at 37
* 13:35 Cryo load started, frsot on LOX tank started to form
* 15:41 Some vent
* 15:55. 56 S25 venting
* 15:58 Frost passed LOX hatch
* 16:03 LOX tank frost reached 1 ring
* 16:25 LOX tank frost reached 2 rings; LOX side of SoLS tank farm venting a lot
* 16:29 Engine chill vent at base from engine chill line started
* 16;35 LOX tank frost reached around 2.5 rings, rest tank getting condensation; filling stopped
* 16:37 **Engine chill pipes venting**
* 16:39-40 Nosecone venting on the whole lenth of the flaps
* 16:42 Regular nosecone vent spotted
* 16:49 Minor frost ring below the TPS tiles on nosecone spotted (Header tank)
* 16:53 Drone spotted
* 16:54-55 Several ventings of S25
* 16:59 **Long depress vents from LOX tank; possibly abort**
* 17:00 Engine chill vent stopped
* 17:05 Flare stack started venting
* 19:32 Road opened

### 21 June 2023 - Spin prime test

Timeline according to LabPadre and NSF streams:

* 10:59 Road closed
* 12:15 Pad cleared
* 13:27 SoLS tank farm venting started near recondenser
* 13:31 Tank farm venting started from main tanks
* 13:40 Condensation formed
* 13:50 Venting on pad base started
* 14:08 Frost line on LOX tank started to form, cryo load started
* 14:55 LOX tank a bit more than 2 rings frosty (bit less than last week), condensation on restof tank started
* 14:59 Some engine chill venting, stopped again
* 15:02 **Engine chill started**
* 15:06 Drone spotted
* 13:12-14 Header tank venting along both flaps, indicating header tank fill; small header tank venting continued
* 15:19 New vent in the center of engine skirt spotted
* 15:20 interesting vent on left flap, looking somewhat like the old engine chill vent, stopped at 15:21:55
* **13:24:35 Spin prime test**
* 15:26 Long depress vent on both tanks

### 26 June 2023 - Static Fire test

* 14:57 - Pad clear alarm/announcement
* 15:02 - Road closed
* 15:07 - Tank Farm activity (no lox or ch4 recondensor)
* 15:38 - Pad clear
* 16:26 - Tank farm activity stopped
* 17:02 - CH4 recondenser activity
* 17:09 - Tank farm activity
* 17:33 - CH4 recondenser active again
* 17:34 - LOX recondenser activity
* 17:51 - LOX loading has started
* 17:54 - Venting at engine chill lines
* 19:04 - Engine chill has started
* 19:16 - Header tanks venting
* 19:27:18 - **STATIC FIRE**
* 19:29:46 - Depress venting (detanking)
* 21:45 - Road reopened

### 05 August 2023 - Lift off

Timeline according to LabPadre discord:

* 07:09 Lift by LR11000X started
* 07:17 Touched down on transport stand
* 15:21 Lifting squid being removed
* 17:53 Detached from LR11000X

### 06 August 2023 - Roll Back

Timeline according to LabPadre discord:

* 1:18 Move of S25 observed
* 2:36 arrived at rocket garden, wher SN15 once stood

### 05 September 2023 - Stacking

S25 being liftedFull stack of S25/B9Full stack of S25/B9Timeline according to LabPadre discord:

* 1:45 - S25 placed between Chopsticks
* 6:50 - Chopsticks moved to lifting points of S25
* 8:05 - Aft flaps opened
* 11:53 - Clear pad PA
* 12:09 - SQD arm moved away
* 12:42 - S25 started lifting
* 14:16 - S25 is placed on top of B9
* 17:13 - SQD attached to S25