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SpaceX Starship SN4 prototype comes together quick after predecessor SN3's demise

"Mae Schubert" (2020-05-04)

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While many businesses in Texas are shuttered due to the COVID-19 pandemic, SpaceX has been busy assembling the latest Starship prototype at its Boca Chica development facility. The early version of Elon Musk's Mars rocket has the serial number SN4, and he shared a photo of it standing tall on the test stand Thursday.

Starship SN4 tank on test stand

— Elon Musk (@elonmusk) April 23, 2020

SN4 came together quickly over the last few weeks after a previous version collapsed during a pressure test earlier this month. 

A webcam Washington DC swing set assembly up by a nearby resident captured the above time-lapse video of the Starship prototype SN4 getting stacked inside the company's on-site vehicle assembly building. reports that bulkheads for another unit, SN5, are also being built at the facility. 

This has been the company's operating mode during Starship's development -- to rapidly assemble two prototypes at the time to be able to quickly pivot to a new unit if one fails. So far, both SN1 and SN3 have failed during pressure tests, while SN2 passed.

Starship's story so far

Another SpaceX Starship prototype bites the dust during pressure testing

Elon Musk shows off Starship prototype coming together in its oversize garage

SpaceX Starship prototype explodes during test in Texas

SpaceX CEO and founder Elon Musk has said that this series of prototypes will be capable of flying to an altitude of around 12.4 miles (20 kilometers) and landing back on Earth. It's likely we'll see one of the SN series of prototypes do a shorter "hop" before that.

It's not clear when we might see any of the Starship prototypes leave the ground, but Musk should soon have a quiver of three of the rockets to work with, which will surely help.