Analysis of information sources in references of the Wikipedia article "بیافآر (راکت)" in Persian language version.
[Musk] added that, since the presentation last month, SpaceX has revised the design of the BFR spaceship to add a "medium area ratio" Raptor engine to its original complement of two engines with sea-level nozzles and four with vacuum nozzles. That additional engine helps enable that engine-out capability … and will "allow landings with higher payload mass for the Earth to Earth transport function."
{{cite AV media}}: نگهداری CS1: موقعیت (link)