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They say bigger is better. If you have a lot you want launched into space, the Falcon Heavy is definitely better.
Instead of multiple launches to get a certain amount of items into space, the Falcon Heavy’s larger payload capacity will enable just one launch to perform the same function.
Falcon Heavy
When Falcon Heavy lifts off in 2017, it will be the most powerful operational rocket in the world by a factor of two. With the ability to lift into orbit over 54 metric tons (119,000 lb)--a mass equivalent to a 737 jetliner loaded with passengers, crew, luggage and fuel--Falcon Heavy can lift more than twice the payload of the next closest operational vehicle, the Delta IV Heavy, at one-third the cost.
The engine can be restarted multiple times to place payloads into a variety of orbits including low Earth, geosynchronous transfer orbit (GTO) and geosynchronous orbit (GSO).
To simplify, the Falcon Heavy will take much heavier payloads into space than any other rocket is capable of, enabling combined payloads to launch together.
It will have double the payload capacity of the current leader in operational launch craft, the Delta IV Heavy from ULA. Capacity goes down if the rocket is intended to be reused, rather than expend it all in a single mission. Yet, SpaceX’s goal is to undercut both the SLS and the Delta IV Heavy launch bills with the ability to reuse parts of the Falcon Heavy.
Here is the launch manifest at this time for the Falcon Heavy first launches.
So, according to this schedule, there are two large satellites, a crewed Dragon private launch, and an Air Force certification plus mission of combined payload.
The Falcon Heavy will primarily be used for very large satellites, combined payloads, and the future proposed “lunar tourism trips.”
1 - For heavy GEO satellite launches
2 - To launch SpaceX own Starlink constellation (perhaps launching as many as 30 or 40 satellites per launch)
3 - To satisfy all US government launch scenarios (becoming a full replacement to ULA rockets)
4 - To launch satellites that F9 can launch but expending the whole rocket or doing a HOT recovery, replacing with a FH launch with much milder thermal re-entry profiles
5 - To launch missions to the Moon and Mars (including manned around the moon very expensive joyrides).
6 - Provide enough performance so the early full re-use experiments can be undertaken (say 4 tons of extra recovery mass is required on the upper stage, that will directly remove 4 tons of payload capability, but since FH can drop over 20 tons to LEO with side booster RTLS + center core ASDS, FH could conceivably do a Iridium/CRS class launch and still recover the upper stage. It might even be possible to launch some smaller payloads to GTO while recovering all 4 pieces of the FH.
