Quote from: cscott on 08/18/2021 10:05 pmTory seems to be doubling down on their previous analysis instead of taking in new data.I don’t blame him for propulsive landing to work they would need far more engines. I doubt designing and building another rocket at this point really makes sense.
Tory seems to be doubling down on their previous analysis instead of taking in new data.
Quote from: c4fusion on 08/19/2021 06:35 amQuote from: cscott on 08/18/2021 10:05 pmTory seems to be doubling down on their previous analysis instead of taking in new data.I don’t blame him for propulsive landing to work they would need far more engines. I doubt designing and building another rocket at this point really makes sense.It wouldn't make sense for Vulcan, but designing a larger rocket to be the thing they make reusable seems wiser than developing SMART-Vulcan. Clearly, Starship has changed the game. It's not enough to merely catch up to Falcon Heavy, they need to make some attempt to match or even exceed SS. So keep Vulcan expendable while rapidly developing its successor. Or die.
Their business case is "offer a product nobody else does, and customers who need it will pay what it cost to deliver it". For ULA, that's handling (not just launch, they have decades of experience with all the esoteric groundside rigmarole that comes with National Security payloads or RTG-based vehicles too) one-off high-value payloads to very precise trajectories on no-slip schedules with high reliability. Frankly, the recent Delta IV delays have done more damage to that business case than SpaceX providing lower prices have. When you have a $2.5Bn satellite (NRO's 2014 estimate for the last KENNENs) you can no longer readily manufacture a replacement for, $250mn to the guys who have handled all your previous launches vs. $100mn to the guys who have not handled any of your secret-squirrel flying faberge eggs before is not a massive saving vs. the increased (perceived or actual) risk. 'Heritage' is not always a boat anchor.
Quote from: Paul451 on 08/19/2021 07:24 amQuote from: c4fusion on 08/19/2021 06:35 amQuote from: cscott on 08/18/2021 10:05 pmTory seems to be doubling down on their previous analysis instead of taking in new data.I don’t blame him for propulsive landing to work they would need far more engines. I doubt designing and building another rocket at this point really makes sense.It wouldn't make sense for Vulcan, but designing a larger rocket to be the thing they make reusable seems wiser than developing SMART-Vulcan. Clearly, Starship has changed the game. It's not enough to merely catch up to Falcon Heavy, they need to make some attempt to match or even exceed SS. So keep Vulcan expendable while rapidly developing its successor. Or die.I don’t see how the business case for that could credibly close. A strategy of ‘hang in there and hope for either the competition to fail or the government to keep funding you’ isn’t the most dynamic response, but ULA are playing a bad hand as well as they can here.
A "bad hand" is something that was handed to you.What ULA is playing with is "consequences".
Quote from: meekGee on 08/19/2021 06:47 pmA "bad hand" is something that was handed to you.What ULA is playing with is "consequences".They are a corporation that was and tries to continue playing by the old rules, which had been reasonably stable for several decades. Then some guy showed up who decided he didn't like the old rules, and had the guts and energy to start changing things.IIRC, the same thing happened to the buggy-whip manufacturers. And more recently to IBM.
Can we drop the buggy whip metaphor? If i see it again I may have to commit bloody murder.EDIT: Forgive my reaction to the buggy whip. But it is a tired metaphor. And if anyone, ever uses 'the little <take your pick> that could' I will.... get very annoyed.
[Vulcan has no heritage. Nor does its engine maker. This ain't your grandfather's EELV.
I would swear I’ve seen “that’s a whole new rocket” in response to changing booster engines and/or fuel. The only part of Vulcan that I can see as meaningful heritage are the RL-10s themselves. Everything else is, at minimum, significantly redesigned.Avionics might be an exception, had it not been for Ariane 5.
Quote from: AllenB on 08/19/2021 11:31 pmI would swear I’ve seen “that’s a whole new rocket” in response to changing booster engines and/or fuel. The only part of Vulcan that I can see as meaningful heritage are the RL-10s themselves. Everything else is, at minimum, significantly redesigned.Avionics might be an exception, had it not been for Ariane 5.wrong. Not the same thing. Atlas V, Detla IV and Vulcan all use the same avionics.My post stands.
Atlas V, Delta IV and Vulcan all use the same avionics.
Quote from: Jim on 08/20/2021 12:16 amQuote from: AllenB on 08/19/2021 11:31 pmI would swear I’ve seen “that’s a whole new rocket” in response to changing booster engines and/or fuel. The only part of Vulcan that I can see as meaningful heritage are the RL-10s themselves. Everything else is, at minimum, significantly redesigned.Avionics might be an exception, had it not been for Ariane 5.wrong. Not the same thing. Atlas V, Detla IV and Vulcan all use the same avionics.My post stands.I think AllenB's point with the Ariane 5 was that using the exact same avionics can actually be detrimental, if it means you forgot to reprogram them to handle the different flight profile of the new rocket. Of course, totally new avionics also need to be programmed correctly, so this isn't a unique hazard of flight-heritage avionics, but it shows that something (specifically, the software) will necessarily be new for the new vehicle.
Be careful what you wish for. Same avionics does not necessarily mean you inherit the same successful heritage.Ariane 5 thought they would decrease risk by using EXACTLY the heritage avionics and software that was used on the Ariane 4. Instead it doomed the mission, as the different trajectory caused numbers to overflow.
Quote from: LouScheffer on 08/20/2021 12:48 amBe careful what you wish for. Same avionics does not necessarily mean you inherit the same successful heritage.Ariane 5 thought they would decrease risk by using EXACTLY the heritage avionics and software that was used on the Ariane 4. Instead it doomed the mission, as the different trajectory caused numbers to overflow.Yes, that is exactly the reference I was making. Carrying over the avionics makes good sense and I’m glad they’ve chosen to do so, but it is no guarantee against failure. Certainly not the same level of risk as the 100th AV flight on the same avionics.
Quote from: nicp on 08/19/2021 08:56 pmCan we drop the buggy whip metaphor? If i see it again I may have to commit bloody murder.EDIT: Forgive my reaction to the buggy whip. But it is a tired metaphor. And if anyone, ever uses 'the little <take your pick> that could' I will.... get very annoyed.Aphorisms are familiar, so people know they won't be misunderstood. Sometimes a bird in the hand is worth a second bite of the apple.
Quote from: Jim on 08/20/2021 12:16 am Atlas V, Delta IV and Vulcan all use the same avionics.Be careful what you wish for. Same avionics does not necessarily mean you inherit the same successful heritage.Ariane 5 thought they would decrease risk by using EXACTLY the heritage avionics and software that was used on the Ariane 4. Instead it doomed the mission, as the different trajectory caused numbers to overflow.