Is Rocket Lab's Neutron Rocket a True Competitor to SpaceX's Falcon 9?

In summary, Rocket Lab is developing the Neutron rocket as a competitor to SpaceX's Falcon9. Unlike SpaceX's original plans for the Falcon, Neutron will use composites for tankage and airframe. However, SpaceX ultimately switched to stainless steel for their Starship due to cost and speed considerations. Neutron will also have an expendable second stage, avoiding the need to withstand atmospheric entry at orbital velocities.
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gleem
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The Neutron is the rocket that Rocket Lab intends to compete with SpaceX's Falcon9. Still in development Rocket Lab is planning to use composites for tankage and airframe. Didn't SpaceX try this for the Falcon but abandoned it in favor of proprietary stainless steel?

https://www.teslarati.com/rocket-lab-reusable-neutron-rocket-first-hardware/
 
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The Falcon 9 tanks are aluminium, the interstage and fairing are carbon fiber plus aluminium.
SpaceX originally wanted to build Starship using carbon fibers and got a giant tool for it but then switched to steel - cheaper, faster to work with, and it can withstand higher temperatures.

Neutron will use an expendable second stage so it doesn't have to worry about atmospheric entry at orbital velocities. The first stage is much slower.
 
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