Quote from: several posters...After looking at this, I'm believing that the Enhanced stage does not use RL10 or liquid hydrogen. The performance described seems to mesh better with an upper stage working at 330-340 sec specific impulse and 10 to 20 tonnes thrust. Something like half of an RD-0110 (LOX/kerosene), or some type of pump-fed hypergolic engine. In other words, no existing U.S. engine - though it would make sense for Aerojet to be involved in this somehow......May be two RD-58M or two 11D33?......How about AJ-10, it is an engine with substantial flight history and powers the delta II upper stage right now plus it is an artojet engine......Here's an idea: LR-91...There has been considerable discussion on what liquid engine we would select for the Enhanced configuration liquid upper stage. Having lost my own personal battle for an RL10-based upper stage (probably for good reason...) I am happy to report that we are negotiation with the Russian government for usage approval of the RD-0124, the current (relatively new) Soyuz upper stage engine. The bad news is that it is yet another non-U.S. engine (the rest of the stage, however, is U.S. manufacture, with final assembly in Chandler). The good news is that it has the perfect packaging aspect ratio for Taurus II, and it's performance kicks a$$!!!Initially it will not have restart capability, so it's definitely ISS-oriented. With restart capability (to be developed later) it has some serious mid-class GTO capability.Now Taurus II ("II E"?) has an easy time lifting a three-person capsule!
...After looking at this, I'm believing that the Enhanced stage does not use RL10 or liquid hydrogen. The performance described seems to mesh better with an upper stage working at 330-340 sec specific impulse and 10 to 20 tonnes thrust. Something like half of an RD-0110 (LOX/kerosene), or some type of pump-fed hypergolic engine. In other words, no existing U.S. engine - though it would make sense for Aerojet to be involved in this somehow......May be two RD-58M or two 11D33?......How about AJ-10, it is an engine with substantial flight history and powers the delta II upper stage right now plus it is an artojet engine......Here's an idea: LR-91...
Why does the diagram contain the non-Cyrillic letters 'L' and 'S'?
. If it did Orbital's got themselves an Atlas V-killer, especially with a liquid engine upper stage.
Quote from: Hyperion5 on 11/14/2012 02:53 pm. If it did Orbital's got themselves an Atlas V-killer, especially with a liquid engine upper stage. Not really. Need the non existent liquid upperstage. Need west coast and KSC pad. Need more performance than Atlas with 2 solids. Need 5m fairing.
a. Given the Antares is 3.9 m in diameter, it's not going to be hard to produce a 5 meter fairing.1. The solid booster issue is also not that hard to overcome--a little engineering work and I'd bet you could fit the same solid boosters onto Antares. 2. Of course, since the VAB is being built to handle just about any rocket type now, Orbital could always just use the shuttle pads as a way around the new pad requirement.
If Korolev is going to wreak revenge beyond the grave, it'll be on Glushko ahead of anyone else. If Antares uses the AJ-1-E6 and it is also used by the SLS, we'd pretty much get the ultimate "Korolev's revenge" moment. Also, there's a real possibility at the AJ-1 replacing the RD-180 in the US fleet. My only concern with the AJ-1 is I have not yet heard definitively, one way or the other, whether it would fit into the Antares' engine bay. If it did Orbital's got themselves an Atlas V-killer, especially with a liquid engine upper stage.
Quote from: Hyperion5 on 11/14/2012 03:35 pma. Given the Antares is 3.9 m in diameter, it's not going to be hard to produce a 5 meter fairing.1. The solid booster issue is also not that hard to overcome--a little engineering work and I'd bet you could fit the same solid boosters onto Antares. 2. Of course, since the VAB is being built to handle just about any rocket type now, Orbital could always just use the shuttle pads as a way around the new pad requirement. a. What experience does OSC have with a large fairings?1. Those are for Atlas and not others2. No, it is not. It is only being stripped so it can be. There is no program coming forward to pay for the mods. Also, use of the VAB and pads and label of "Atlas Killer" are mutually exclusive. The costs with using LC-39 would negate any advantage. Your point has been discredited.
1. Orbital contracting with either the same firm that builds the Atlas V fairings OR another firm is not an impossibility.2. SRBs) SRBs are cheap, ubiquitous and made by at least two firms for US-launched rockets. If Orbital put out the call for SRBs tailored to their rocket, the fuel and basic architecture is going to be very similar to the SRBs used on an Atlas V. I'm fairly confident if Aerojet or ATK were told Orbital was looking into SRBs for the Antares, that they would not exactly turn down the opportunity. 3. Pads and money for mods) If Spacex believes they can build an all-new launch pad in Texas or elsewhere on the cheap, why can't Orbital? It's not like Orbital is a tiny firm without the cash for this. If they want to turn the Antares into an EELV competitor,
Quote from: Hyperion5 on 11/14/2012 04:11 pm1. Orbital contracting with either the same firm that builds the Atlas V fairings OR another firm is not an impossibility.1. There are agreements where companies don't allow subcontractor to supply the same hardware to competitors.
1. Orbital contracting with either the same firm that builds the Atlas V fairings OR another firm is not an impossibility.
Quote from: Jim on 11/14/2012 06:50 pmQuote from: Hyperion5 on 11/14/2012 04:11 pm1. Orbital contracting with either the same firm that builds the Atlas V fairings OR another firm is not an impossibility.1. There are agreements where companies don't allow subcontractor to supply the same hardware to competitors.Doesn't the Atlas V use the same 5 meter fairing as Ariane 5? Not that I am advocating an Antares evolution to EELV range, think it is just fine in its eventual Delta II to Atlas III range.
Quote from: Hyperion5 on 11/14/2012 04:11 pm1. Orbital contracting with either the same firm that builds the Atlas V fairings OR another firm is not an impossibility.2. SRBs) SRBs are cheap, ubiquitous and made by at least two firms for US-launched rockets. If Orbital put out the call for SRBs tailored to their rocket, the fuel and basic architecture is going to be very similar to the SRBs used on an Atlas V. I'm fairly confident if Aerojet or ATK were told Orbital was looking into SRBs for the Antares, that they would not exactly turn down the opportunity. 3. Pads and money for mods) If Spacex believes they can build an all-new launch pad in Texas or elsewhere on the cheap, why can't Orbital? It's not like Orbital is a tiny firm without the cash for this. If they want to turn the Antares into an EELV competitor,1. There are agreements where companies don't allow subcontractor to supply the same hardware to competitors.
2. No, new developments are not cheap. And the point was the "same" boosters. Additionally, Antares ground processing flow would preclude many SRM attachment configurations.
3. If the pads are not located at CCAFS or VAFB, then the vehicle is not an EELV competitor.