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Sea Dragon

Short answer: Sea Dragon was a 1962 concept for a huge two-stage rocket designed by Robert Truax at Aerojet. It would be built cheaply in a shipyard, towed to sea, ballasted upright and launched from the water, avoiding a launch pad.

The first stage burned RP-1 and liquid oxygen, the second liquid hydrogen and oxygen, and it was meant to lift about 550 tonnes to low Earth orbit. It was never built. The footage, credited to newspaceenterprise, shows an animation of the launch.

VideoWrite-up1 sources
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What should you know about Sea Dragon?

Quick facts. Each one stands alone and has a stable ID you can cite.

  1. 1962.

    DD-498-F01 · Write-up · Exhibit A (Year)

  2. Robert Truax, Aerojet.

    DD-498-F02 · Write-up · Exhibit B (Designer)

Video transcript: Sea Dragon: Sea Dragon Would Have Launched From the Ocean, Floating Upright

[...] a conceptual heavy [...] 1960s by Aerojet [...] capable of carrying [...] Unlike traditional [...] ocean launch, [...] two-stage [...] or RP-1/LOX, [...] NOW YOU KNOW!

Burned-in captions, read frame by frame (see transcript.md) · 21.8s Reel ·

Video coming soonSea Dragon · Instagram Reel
Sea Dragon: Sea Dragon Would Have Launched From the Ocean, Floating Upright Instagram Reel · · 21.8s

The write-up

Sea Dragon would have launched from the ocean, floating upright. It was designed to lift about 550 tonnes.

  1. Exhibit A

    Year

    1962.

  2. Exhibit B

    Designer

    Robert Truax, Aerojet.

  3. Exhibit C

    Launch

    From the ocean.

  4. Exhibit D

    Fuel

    RP-1/LOX first stage.

  5. Exhibit E

    Payload

    About 550 t.

Questions people ask about Sea Dragon

Launch site?

Floating.

Source: Write-up · Exhibit A (Year) · Wikipedia: Sea Dragon (rocket)

Designer firm?

Truax.

Source: Write-up · Exhibit B (Designer) · Wikipedia: Sea Dragon (rocket)

Stages?

Simple.

Source: Write-up · Exhibit C (Launch) · Wikipedia: Sea Dragon (rocket)

First-stage fuel?

Kerosene.

Source: Write-up · Exhibit D (Fuel) · Wikipedia: Sea Dragon (rocket)

Was it built?

Concept.

Source: Write-up · Exhibit E (Payload) · Wikipedia: Sea Dragon (rocket)

Test Your Knowledge

All quizzes →

5 questions, all from this case file. Answers are revealed instantly.

  1. Launch site?

    1. Ocean
    2. Desert
    3. Mountain
    4. Airplane
    Show the answer

    Answer: A. Ocean Floating. Source: Write-up · Exhibit A (Year) · Wikipedia: Sea Dragon (rocket)

  2. Designer firm?

    1. Aerojet
    2. Boeing
    3. SpaceX
    4. Lockheed
    Show the answer

    Answer: A. Aerojet Truax. Source: Write-up · Exhibit B (Designer) · Wikipedia: Sea Dragon (rocket)

  3. Stages?

    1. Two
    2. One
    3. Five
    4. Three
    Show the answer

    Answer: A. Two Simple. Source: Write-up · Exhibit C (Launch) · Wikipedia: Sea Dragon (rocket)

  4. First-stage fuel?

    1. RP-1/LOX
    2. Solid
    3. Nuclear
    4. Methane
    Show the answer

    Answer: A. RP-1/LOX Kerosene. Source: Write-up · Exhibit D (Fuel) · Wikipedia: Sea Dragon (rocket)

  5. Was it built?

    1. No
    2. Yes
    3. Partly flown
    4. Twice
    Show the answer

    Answer: A. No Concept. Source: Write-up · Exhibit E (Payload) · Wikipedia: Sea Dragon (rocket)

Cite this case file

Easterling, Marcus. "Sea Dragon." The Detail Department (DetailEnjoyer), case file DD-498, last updated Feb 25, 2025. https://detailenjoyer.com/case/sea-dragon/

Permalink: https://detailenjoyer.com/case/sea-dragon/ · Last updated

Markdown version

Cite a single fact by its ID, for example DD-498-F01 → https://detailenjoyer.com/case/sea-dragon/#DD-498-F01