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A mass driver or electromagnetic catapult is a proposed method of non-rocket spacelaunch which would use a linear motor to accelerate and catapult payloads up to high speeds. Existing and proposed mass drivers use coils of wire energized by electricity to make electromagnets, though a rotary mass driver has also been proposed. [1]
Because a rocket must carry all of its reaction mass, most of the initially-expended reaction mass goes towards accelerating reaction mass rather than payload. If the rocket has a payload of mass P, the spacecraft needs to change its velocity by , and the rocket engine has exhaust velocity v e, then the reaction mass M which is needed can be ...
In aerospace engineering, payload fraction is a common term used to characterize the efficiency of a particular design. The payload fraction is the quotient of the payload mass and the total vehicle mass at the start of its journey. It is a function of specific impulse, propellant mass fraction and the structural coefficient. In aircraft ...
A mass driver uses some sort of repulsion to keep a payload separated from the track or walls. Then it uses a linear motor (an alternating-current motor such as in a coil gun, or a homopolar motor as in a railgun) to accelerate the payload to high speeds. After leaving the launch track, the payload would be at its launch velocity.
Mindustry is a real-time strategy, factory management, and tower defense game developed and published by Anuken under the FOSS GNU General Public License v3. [ 2 ] [ 3 ] It is available for Windows , MacOS , Linux , Android and iOS , [ 4 ] [ 5 ] where it can be bought on platforms like Steam , [ 6 ] iOS App Store [ 7 ] or downloaded for free ...
However, mass fraction may have little to do with the costs of a rocket, as the costs of fuel are very small when compared to the costs of the engineering program as a whole. As a result, a cheap rocket with a poor mass fraction may be able to deliver more payload to orbit with a given amount of money than a more complicated, more efficient rocket.
The EELV Secondary Payload Adapter (ESPA) is an adapter for launching secondary payloads on orbital launch vehicles.. Originally developed for US launch vehicles in the 2000s to launch secondary payloads on space missions of the United States Department of Defense that used the Atlas V and Delta IV, the adapter design has become a de facto standard and is now also used for spaceflight missions ...
Instead, a mass driver can be designed to handle a range of exhaust speeds, to allow mission planners to choose, long after the vehicle has been launched, choose whether any given delta-v maneuver is accomplished with a high-exhaust-velocity, high-energy, low-mass maneuver, or a low-exhaust-velocity, low-energy, high-mass maneuver, or some ...