The second stage tank of a Falcon 9 is simply a shorter version of the first stage tank and uses most of the same tooling, material, and manufacturing techniques, reducing production costs. Bringing the second stage back to Earth in one piece might well be the most challenging aspect of developing the Falcon 9. Static fire of Falcon 9 complete ahead of launching 60 Starlink satellites—due to poor weather in the recovery area tomorrow, now targeting launch on Sunday, February 16 at 10:25 a.m. EST, 15:25 UTC News Follow a SpaceX Falcon 9 Block 5 booster recovery from start to finish [video] Falcon 9 B1047.2 lands aboard drone ship OF Course I Still Love You for the second time. — Elon Musk (@elonmusk) November 7, 2018 “Falcon 9 second stage will be upgraded to be like a mini-BFR Ship,” Musk said. Only the Saturn V moon rocket, last flown in 1973, delivered more payload to orbit. Its first stage is composed of three Falcon 9 nine-engine cores whose 27 Merlin engines together generate more than 5 million pounds of thrust at liftoff, equal to approximately eighteen 747 aircraft. it would then be possible to calculate the complete flight parameters. So, I was wondering if someone has a reference or something for the trajectory actually used by Falcon 9 v1.1 before first stage separation in particular before first stage separation. Falcon 9's second-stage Merlin engine, shown above during its pre-deployment burn, demonstrated its ability to restart after all 11 Orbcomm satellites were successfully deployed. The payload continues into space, riding on the second stage. By mean of the other published parameters (thrust, weight, etc.) Something relating the altitude with the angle respect to the vertical. Falcon 9 Second Stage Recovery Requires 'Giant Party Balloon' Landing the second stage of the Falcon 9 requires a really big balloon, and there's no guarantee it will work.  The Falcon 9 interstage, which connects the upper and lower stage, is a carbon-fiber aluminum-core composite structure. Excess propellant reserved for Falcon 9 first-stage recovery operations will be diverted for use on the primary mission objective, if required, ensuring sufficient performance margins for successful missions". Despite early public statements that SpaceX would endeavor to make the Falcon 9 second-stage reusable as well, by late 2014, they determined that the mass needed for a re-entry heat shield, landing engines, and other
The first stage of this specific Falcon 9 – B1056.3 – has flown twice before. The payload, SSO-A, was deployed over a 30 minute period shortly after the second stage of the Falcon had shut down.
A two-stage Falcon 9 rocket rises from its launchpad, and at an altitude of fifty miles the first-stage booster separates.