What are the IRL counter parts of All of KSP's parts?

[Joey_theduck]

I just wanted to know.

[Chel]

The Mk1 Command Pod is based on the Mercury Capsule

[0something0]

I can name some more.

Vector - Space Shuttle Main Engine (RS-25) - Aerojet Rocketdyne 

Rapier - Saber Air Breathing Rocket - Reaction Engine 

Cupola - ISS Cupola - European Space Agency

NERV - NERVA - U.S. Atomic Energy Commission, NASA, Aerojet, Westinghouse 

MK1-2 capsule - Apollo Command Module - NASA

Edited March 8, 2019 by 0something0

[Tyko]

There are many KSP parts that are inspired by real life parts, but there's certainly not a 1:1 comparison for each.

The engines are a great example. Many of them are roughly modeled off of RL engines, but the stats are tweaked (or changed entirely) for game balance. 

Another is scaling. RL parts use a huge variety of diameters. KSP converts everything into it's 1.25/2.5/3.75m Lego style format for game play reasons. The result is that you can't just take the RL part and scale it to a given value to get the Kerbal version.

[KevinW42]

In addition to what other people mentioned, the Mammoth is based on the SLS first stage (which is basically just a cluster of four Shuttle main engines)

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Mastodon - F-1 engine used in the first stage of the Saturn V

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Skiff - J-2 engine used in the second and third stages of the Saturn V

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Wolfhound - Service Propulsion System used in the Apollo spacecraft

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Bobcat - LR87 from the first stage of the Titan II used in the Gemini Program

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Cheetah - LR-91 from the second stage of the Titan II

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Kodiak and Cub - the RD-107/RD-108 main engines and the vernier thrusters respectively from the Soyuz rocket

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