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Re:Rocket Will Be Recaptured in Midair with a Helicopter by JshWright on Tuesday April 14, 2015 @09:01AM (#9373842)
What do you mean by fewer? Vulcan is replacing the Atlas and Delta platforms. Both use a single engine per core (the Atlas uses the Russian RD-180, while Delta uses Aerojet's RS-68).

This will actually double the number of engines they're using.

Re:Rocket Will Be Recaptured in Midair with a Helicopter by ansible on Tuesday April 14, 2015 @10:22AM (#9374434)
What do you mean by fewer?

1 or 2 vs. 9 for a Falcon9 core.

Re:Rocket Will Be Recaptured in Midair with a Helicopter by JshWright on Tuesday April 14, 2015 @10:29AM (#9374499)
Falcon 9 is a SpaceX rocket, not a ULA rocket.

There are advantages and disadvantages to both approaches. ULA has a long track record of going to space very reliably on single engine platforms.

Re:Rocket Will Be Recaptured in Midair with a Helicopter by ansible on Tuesday April 14, 2015 @01:23PM (#9375817)
Falcon 9 is a SpaceX rocket, not a ULA rocket.

Yes, I'm aware of that.

There are advantages and disadvantages to both approaches. ULA has a long track record of going to space very reliably on single engine platforms.

That's true. Both the Atlas and Delta programs have been pretty reliable.