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3

Launching from international waters. In addition to the factors mentioned in other posts, there's an additional benefit from launching from the ocean: you can launch from international waters. This could be handy if you're launching a rocket that uses some form of material or process that is illegal or heavily regulated for civilian use in your home country....


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Early in the development of the Polaris missile system, there was a lot of work on launching a missile from underwater. Polaris was a nuclear deterrent to rapidly launch multiple missiles from a fully submerged submarine. Staying submerged until a boat-load of launches were complete was a key goal: the boat was to be very difficult to track and destroy ...


35

Sea Dragon The very large rocket was probably Sea dragon and the advantages were more on allowing a massive vehicle to be built at all rather than inherent advantages in starting underwater. (image credits) Building the launch vehicle on a slip way and floating it to the launch site bypasses a number of size constraints in building and moving large ...


9

You might be thinking of the Sea Dragon project, although this never got past the conceptual / early planning stages. Some of the advantages of a sea launch are that you can be far away from habitation and the water can provide cooling and acoustic damping during launch. But the disadvantages are also serious. You are even more at the mercy of the weather ...


0

Another way to look at it: Consider an object orbiting Earth at some inclination relative to the equator. Now consider its path projected onto Earth's surface. If you plot that path as latitude vs longitude, you'll get a sinusoid. You can see this in views of mission control rooms where an orbiting spacecraft is displayed on an equirectangular world map. ...


2

Reductio ad absurdum If you could choose freely on which circle to orbit, the most convenient place to take off from would be the North pole. That would set the circle diameter to zero. You would then climb to whichever altitude you pleased and remain there, immobile in space, for as long as you wanted. How cool would that be? An attempt at analogy In ...


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The short answer is that a spacecraft is attracted to the center point of the earth, not to the earth's rotational axis. [I]t would make sense to me that launching east would result in a 0° inclination with the orbital plane raised so it's parallel to the equator but above or below it. Here's one explanation of why that wouldn't happen that you might ...


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The center of the Earth is, for any reasonable approximation, in one of the focus points of an elliptical orbit. For a circular orbit, there is only one focus point, so the center of the Earth is in the center of the orbit. The plane of the orbit thus would intersect both the center of the Earth as well as the launching site. If the launch site was on the ...


7

Earth's gravity pulls you towards the centre of the Earth, so if you're above Kennedy, that pull has a Southwards component, as well as the component towards the Earth's axis. So your path curves South, so that in the end the orbit spends equal amounts of time North and South of the equator, and the pulls in that direction balance out over time. All orbits ...


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If it's not feasible at all to send a projectile into orbit like this then we'd like to know if it's feasible to perhaps grab the projectile at the height of it's trajectory. Something a little like this may be feasible. The basic idea is to launch the projectile from the highest altitude you can manage, on a fairly flat trajectory a little faster than ...


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1) Cannons don't fire projectiles above the propagation velocity of the propellant. That's nowhere near orbital velocity. 2) Orbital mechanics 101: Other than when conducting gravity maneuvers your orbit will include the point where your rocket shut down. For a cannon that's when it leaves the barrel--thus your payload comes back down after going ...


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Tall long heavy things filled with explosive liquid on a pitching base and a pitching center of gravity and an entended mechanical leverage, not good. Metals can only flex so much.


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