Editing Tripropellant rocket (section)

{{More citations needed|date=March 2009}}
{{Short description|Rocket that burns 3 propellants at once or 2 fuels with an oxidizer, sequentially}}
A '''tripropellant rocket''' is a [[rocket]] that uses three [[propellants]], as opposed to the more common [[bipropellant rocket]] or [[monopropellant rocket]] designs, which use two or one propellants, respectively. Tripropellant systems can be designed to have high [[specific impulse]] and have been investigated for [[single-stage-to-orbit]] designs. While tripropellant engines have been tested by [[Rocketdyne]] and [[NPO Energomash]], no tripropellant rocket has been flown.

There are two different kinds of tripropellant rockets. One is a [[rocket engine]] which mixes three separate streams of propellants, burning all three propellants simultaneously. The other kind of tripropellant rocket is one that uses one [[oxidizer]] but two [[fuel]]s, burning the two fuels in sequence during the flight.