JF Mezei wrote:


Questions:


Do you EVER bother to try to find your own answers?


1-If both boosters separate at same time, what sort of logistics are
involved in landing them, presumably at same time?

two barges a few km apart ? 2 landing pads on ground ? (at what distance?)


Trivial to find. One has to wonder why you don't bother.

https://arstechnica.com/science/2017...sters-at-once/

https://www.youtube.com/watch?v=4Ca6x4QbpoM


Apart from extra-terrestrial missions, what sort of commercial payloads
*need* this?

Or is this about launching multiple satellites at the same time?

Or is the goal to use the extra power to deposit second stage at a
higher GTO orbit so it has less work to do?


Again, trivial to find. One wonders why you can't be bothered.

http://www.spacex.com/missions

Generally Falcon Heavy is the alternative for payloads that would
otherwise max out a Falcon 9. It will also allow satellites to carry
much more station keeping fuel, which means they last longer.


But if stage 2 starts at 28° inclination but at higher altitude, doesn't
it make it harder for it to correct inclination to 0° equatorial? Or is
that a minimal concern?


Not a concern at all. Plane change is easier higher up because you're
moving more slowly.


(Or is it expected the 1st stage will make a large contribution to
reduce inclination)


They're going to do what makes sense, just like every other launcher.
Yeah, it's rocket science.


--
"Some people get lost in thought because it's such unfamiliar
territory."
--G. Behn