- This technology is the first stage of air travels.
- It is the first type of engine to be developed and it is essential to achieve development of the first spaceships.
- This technology focus on Combustion engines.
- This engine is the best engine for atmospheric journeys (within the same planet).
- However, on long distance space trips, it tends to heavy consumptions and long times.
- Each upgrade increases the combustion engines' efficiency, increasing the average speed in all journeys, with the same fuel consumption.
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