ext_291222 ([identity profile] averros.livejournal.com) wrote in [personal profile] pargentum 2016-09-10 10:14 am (UTC)

The explanation is simple: money. One booster is cheaper than two boosters, and it has enough thrust for the mission.

The main engine is Soviet RD-180 with 8 degrees of thrust vectoring, which is sufficient for asymmetry compensation.
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