4 ms·
That depends on the orbital destination. Delta IV Heavy has a _very_ eficient upper stage, which makes it better for high energy destinations. Additionally, th
by JshWright 9y ago
That depends on the orbital destination. Delta IV Heavy has a _very_ eficient upper stage, which makes it better for high energy destinations.
Additionally, the Falcon upper stage has very limited on-orbit capabilities. It can't coast for a long time in order to insert a payload directly into a high orbit. (Though SpaceX is working on this, and did some tests in that direction on the recent NROL-76 launch)