I hate to throw more fuel on the BO-SpaceX flame wars, but even if Bezos ultimate goal is the moon and not Mars, there won't be enough money coming from the government to pay for two manned programs. And both of these nothing-but-exploration programmes will drain a lot of the funds needed to design all the architecture other than rockets, required to build up a self sustaining space economy.Unless NASA ditches SLS and uses the money to ramp up the development of a commercial space station, so there is an operational cheap laboratory for (semi-) commercial initiatives to research commercial applications of micro gravity by the time ISS comes crashing down (which would be ASAP if there is a more economically viable alternative), no sustainable activities in space will come from these new bigger rocket, and they will all be 'rockets to nowhere', still struggling to get missions funded by short lived administrations.Having now antagonized just about everybody on this site, let me end on a high note: we truly live in a new age of great explorations, with private people paying for spectacular missions, without having to make money from it. I'm not counting on seeing the first succesful colonies in my lifetime, but it'll be a great ride none the less.
My two cents: I would bet that they have oversized their first stage to be able to do RTLS with most commercial payloads. They believe it is worth spending more initially and then recover from minimal refurbishment and operational costs. Sent from my Nexus 5 using Tapatalk
The reasons for these big new rockets (New Glenn and Falcon Heavy) leave me puzzled. There is no apparent DoD or commercial need. NASA hasn't put out an RFP for anything this powerful. But there must be a reason. These are multi-billion dollar development projects!The fact that they are both designed to launch 40 to 50-plus tonnes to LEO is interesting. How could it be a coincidence that they seem to match capabilities? Who has the money to buy rides on these things? What could weigh that much? During the late 1980s there were for a time efforts on Titan Barbarian and on a McDonnell Douglas equivalent, designed to lift 100,000 lbs to LEO, but I doubt that the Pentagon has rebooted a Manhattan-class secret plan to seed the heavens with chemical lasers!China is working on an SLS class rocket. Could there be something afoot to counter that effort? I have a hard time believing that multiple companies, now, would embark on such substantial, almost copy-cat development efforts unless some entity - with funding - had quietly specified a need. - Ed Kyle
Quote from: SgtPoivre on 09/13/2016 06:35 pmMy two cents: I would bet that they have oversized their first stage to be able to do RTLS with most commercial payloads. They believe it is worth spending more initially and then recover from minimal refurbishment and operational costs. Sent from my Nexus 5 using TapatalkIf that were the case then a 2nd stage with a BE-3U would make more sense - using a BE-4 for the second stage is puzzling.
The reasons for these big new rockets (New Glenn and Falcon Heavy) leave me puzzled. There is no apparent DoD or commercial need.
Quote from: GWH on 09/13/2016 07:21 pmQuote from: SgtPoivre on 09/13/2016 06:35 pmMy two cents: I would bet that they have oversized their first stage to be able to do RTLS with most commercial payloads. They believe it is worth spending more initially and then recover from minimal refurbishment and operational costs. Sent from my Nexus 5 using TapatalkIf that were the case then a 2nd stage with a BE-3U would make more sense - using a BE-4 for the second stage is puzzling.The use of a BE-4U on 2nd stage suggests the 2 stage LNG would be used on LEO only where higher energy would add the BE-3U 3rd stage. The 5x higher thrust BE-4U makes sense when used with heavy 50mt payloads or the 3rd stage vs the BE-3U. Gravity losses can eat the advantage of a lower thrust but higher ISP engine. Not so when it comes to already in orbit orbit-maneuvers.
Quote from: edkyle99 on 09/13/2016 06:40 pmThe reasons for these big new rockets (New Glenn and Falcon Heavy) leave me puzzled. There is no apparent DoD or commercial need.There's a DoD need for the Falcon Heavy.
Quote from: Oli on 09/13/2016 07:58 pmThere's a DoD need for the Falcon Heavy. Remains to be seen. Delta 4 Heavy flies less than once per year, average, and the average seems to be decreasing. Vulcan ACES, Falcon Heavy, and now maybe New Glenn are going to compete for this less-than one annual launch and only one will win. - Ed Kyle
There's a DoD need for the Falcon Heavy.
If that were the case then a 2nd stage with a BE-3U would make more sense - using a BE-4 for the second stage is puzzling.
Quote from: Lars-J on 09/13/2016 05:41 amQuote from: QuantumG on 09/13/2016 03:11 amWow, I'm agreeing with Oli. The ADHD of Blue Origin seems set to exceed that of SpaceX. What have these guys got against actually making a profit? That's how you grow a business.We know the business credentials of Jeff Bezos and Elon Musk. Do you care to share yours? If you really have some solid business advice they are unaware of, why don't you do them a favor and let them know? Precisely. It was a nonsense point to start with. Amazon will supply the profit for the ambitions of Blue Origin.
Quote from: QuantumG on 09/13/2016 03:11 amWow, I'm agreeing with Oli. The ADHD of Blue Origin seems set to exceed that of SpaceX. What have these guys got against actually making a profit? That's how you grow a business.We know the business credentials of Jeff Bezos and Elon Musk. Do you care to share yours? If you really have some solid business advice they are unaware of, why don't you do them a favor and let them know?
Wow, I'm agreeing with Oli. The ADHD of Blue Origin seems set to exceed that of SpaceX. What have these guys got against actually making a profit? That's how you grow a business.
Remains to be seen. Delta 4 Heavy flies less than once per year, average, and the average seems to be decreasing. Vulcan ACES, Falcon Heavy, and now maybe New Glenn are going to compete for this less-than one annual launch and only one will win. - Ed Kyle
Please remember that the rocket equation depends not only on isp, but on pmf. A really light engine and stage might be able to (almost) match a normal H2 stage. And at a fraction of the cost. Say 90% of performance at 50% of the cost, or less.
For the 3-stage Glenn which already has a hydrolox 3th stage a hydrolox 2nd stage would be of little benefit. Moreover BO has an efficient methalox engine with the right thrust.
Falcon Heavy? New Glenn? NASA chief says he’s not a “big fan”..."If you talk about launch vehicles, we believe our responsibility to the nation is to take care of things that normal people cannot do, or don’t want to do, like large launch vehicles," Bolden said. "I’m not a big fan of commercial investment in large launch vehicles just yet."...
The reasons for these big new rockets (New Glenn and Falcon Heavy) leave me puzzled. There is no apparent DoD or commercial need. NASA hasn't put out an RFP for anything this powerful. But there must be a reason. These are multi-billion dollar development projects!