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I don't think it's a suicide burn. The upper stage of the BFG has separate engines for vacuum (4) and atmosphere (2). The two atmospheric engines are only used for landing so, unlike the Falcon 9/Heavy, they can probably be throttled down far enough so the thrust equals the weight. The suborbital earth transport rocket (which is super hypothetical at this point) would presumably have these features too.

Another way to say this is that suborbital flight requires sufficiently less Delta v that you can afford to have engine diversity.




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