Five Spacex Raptor Engines on a first stage could launch 536 tons of payload
A June 2014 talk by Tom Mueller, the head of rocket engine development at SpaceX, provided more specific engine performance target specifications indicating 6,900 kN (705 tonnes-force) of sea-level thrust, 8,200 kN (840 tonnes-force) of vacuum thrust, and a specific impulse of 380 seconds.
Source: http://nextbigfuture.com/2014/10/five-spacex-raptor-engines-on-first.html
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