Delta 4 Should Be Replaced by New Delta 5

[VDD1991]

The hypothetical notion of a Delta V is now moot because the Delta IV Heavy will be supplanted by the new Vulcan rocket along with the Atlas V. The name Delta refers to the fact that the fourth upper stage developed for early SLV derivatives of the Thor IRBM was named the Delta in honor of the Greek letter delta.

[VDD1991]

@ robert_d
We already have the Atlas V and the Falcon 9.
Atlas V and Delta IV are expected to be replaced by Vulcan.
We expect to have Falcon heavy and New Glenn.

It would be better to spend the time working on payloads and BLEO missions for these launchers.
So why keep trying to find a replacement for SLS and or reuse of shuttle hardware?
Very true SLS has to go sooner than later. It is holding the U.S. space program back by funding and resources.

The SLS intended for deep space missions. The Vulcan and Falcon Heavy are only intended to deliver payloads to LEO and GTO only.

[GWH]

@ robert_d
We already have the Atlas V and the Falcon 9.
Atlas V and Delta IV are expected to be replaced by Vulcan.
We expect to have Falcon heavy and New Glenn.

It would be better to spend the time working on payloads and BLEO missions for these launchers.
So why keep trying to find a replacement for SLS and or reuse of shuttle hardware?
Very true SLS has to go sooner than later. It is holding the U.S. space program back by funding and resources.

The SLS intended for deep space missions. The Vulcan and Falcon Heavy are only intended to deliver payloads to LEO and GTO only.

LOL. Remind me again which rockets every single deep space mission in the past decade have flown on? Ones sized like FH and Vulcan or smaller.

If you are referring to crewed deep space missions, there are plenty of alternative architectures that would work just find on FH or Vulcan.