Assertion: rocket's stage | /r/HasProperty | powered by its be-4 rocket engine
Facets:
value: under development
type: OTHER
Source sentences:
text: In September 2015, Blue Origin announced details of an unnamed planned orbital launch vehicle, indicating that the first stage would be powered by its BE-4 rocket engine currently under development, while the second stage would be powered by its recently completed BE-3 rocket engine.