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A reaction engine is an engine or motor that produces thrust by expelling reaction mass (reaction propulsion), in accordance with Newton's third law of motion. This law of motion is commonly paraphrased as: "For every action force there is an equal, but opposite, reaction force."
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mass needed energy reaction citation displaystyle rocket delta-v power exhaust speed thrust engines mission engine delta payload velocity required fuel
| Subject | Predicate | Object | Confidence | Src |
|---|---|---|---|---|
| Reaction engine | is a | engine or motor that produces thrust by expelling reaction mass | 0.90 | text |
| Hall effect thrusters | instance of | and more uncommon variations | 0.80 | text |
| ion drives | instance of | and more uncommon variations | 0.80 | text |
| mass drivers | instance of | and more uncommon variations | 0.80 | text |
| and nuclear pulse propulsion | instance of | and more uncommon variations | 0.80 | text |
| Ion thrusters have exhaust velocities that can be enormously higher than this ideal | instance of | Drives with a specific impulse that is both high and fixed | 0.80 | text |
| and thus end up powersource limited | instance of | Drives with a specific impulse that is both high and fixed | 0.80 | text |
| give very low thrust | instance of | Drives with a specific impulse that is both high and fixed | 0.80 | text |
| rockets | instance of | Some effects such as Oberth effect can only be significantly utilised by high thrust engines | 0.80 | text |
| moving from one orbit to another | instance of | for a given objective | 0.80 | text |
| the required Δ v | instance of | for a given objective | 0.80 | text |
| Reaction engine | related to Cycle efficiency | All | 0.60 | section |
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