Legacy-22 Engines

Janning Legacy-22 engines are the rocket engines of choice for the spaceship Reverie. There are four of them mounted onto the rear of the vessel. They are capable of 2.2 million pounds of thrust each, giving Reverie the ability to reach Earth's escape velocity quicker than any other ship in its class.

The actual engines themselves take up little space in their compartments, which is why the hull can cave inward after a few meters (visible in the picture).

Use
The engines are used as Reverie's primary method of forward propulsion while navigating in normal space. They are powered by liquid fuel stored in tanks within the ship, and have been modified to consume as little fuel as possible while still providing substantial thrust. The only downside to these engines is the rapid internal heat buildup when being used for a long amount of time. Since there are no separate stages, heat needs to be purged through heat syncs and ejected through the cargo bay doors during launches from planetary surfaces with high surface gravity.

Trivia

 * The Legacy-22 is influenced heavily off of SpaceX's Merlin 1D rocket engine.