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[i]Pratt & Whitney Rocketdyne, which owns rights to the massive engines built by its predecessor Rocketdyne, proposed it as an option to companies that have submitted risk reduction proposals to the U.S. space agency for a strap-on SLS booster. The advanced booster would crank the lift capacity of the deep-space SLS up to at least 130 metric tons, from the targeted 70 metric tons after its first scheduled flights in 2017 and 2021. It's early days yet, to say the least, but the engine-maker had interest in the big old engine from some of the launch vehicle companies that submitted proposals, so it's on the table for the time being... NASA will decide this summer what design options for the advanced booster that it wants to pursue, and the F-1 has some advantages. It's still the most powerful rocket engine ever built, and Rocketdyne engineers in the 1960s solved issues like combustion stability that would cost a fortune to recreate today.[/i]
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