Quote from: DistantTemple on 07/28/2019 03:10 amIs this a valid or likely scenario?1) Gateway is made of a habitat(cyrus) and PPI(power and propulsion) Hab has at least 2 radial IDA's. 2) Descent and ascent stages are delivered either together or separate. If separate they are put together at the hab. Their final config will be: hanging off the HAB on an IDA in order - the ascent stage docked, then the descent stage attached (it is not a habitable space just a rocket "stage")3) Orion arrives with crew, and docks at (the) other IDA and crew have use of the hab as well as Orion.4) Any transfers of supplies and propellant etc are completed, and if not done in 2) above the descent and ascent stages are joined, possibly with EVA or Canada arm etc to solve problems.5) Crew transfer to ascent stage with descent stage attached and descend to lunar surface.6) later they ascend in the ascent stage abandoning the descent stage on the lunar surface. The ascent stage docks back at (the same) IDA.7) Crew transfers to the hab.8 ) Crew transfers to Orion nd heads back to Earth. - (I don't know the fuel situation.... for the return)(maybe Dragon2 plus a PPE or F9S2 could take the place of Orion.You've left out the tug.
Is this a valid or likely scenario?1) Gateway is made of a habitat(cyrus) and PPI(power and propulsion) Hab has at least 2 radial IDA's. 2) Descent and ascent stages are delivered either together or separate. If separate they are put together at the hab. Their final config will be: hanging off the HAB on an IDA in order - the ascent stage docked, then the descent stage attached (it is not a habitable space just a rocket "stage")3) Orion arrives with crew, and docks at (the) other IDA and crew have use of the hab as well as Orion.4) Any transfers of supplies and propellant etc are completed, and if not done in 2) above the descent and ascent stages are joined, possibly with EVA or Canada arm etc to solve problems.5) Crew transfer to ascent stage with descent stage attached and descend to lunar surface.6) later they ascend in the ascent stage abandoning the descent stage on the lunar surface. The ascent stage docks back at (the same) IDA.7) Crew transfers to the hab.8 ) Crew transfers to Orion nd heads back to Earth. - (I don't know the fuel situation.... for the return)(maybe Dragon2 plus a PPE or F9S2 could take the place of Orion.
We sort of need a documentation, notices and announcements only thread for this subject so it is easier to look up details or get up to speed.
Speculation:What if the PPE is docked to a radial port on the modified Cygnus?The benefit I see is that no changes are needed to Cygnus' propulsion system. Three radial ports and an axial port allow sufficient docking spaces for the PPE, Orion, the lander, and a cargo module. The area where a fourth radial port could go is set up to allow for a robotic arm. Alternatively, four radial ports with a docking adapter that can support an arm.
Quote from: Joseph Peterson on 07/29/2019 04:34 amSpeculation:What if the PPE is docked to a radial port on the modified Cygnus?The benefit I see is that no changes are needed to Cygnus' propulsion system. Three radial ports and an axial port allow sufficient docking spaces for the PPE, Orion, the lander, and a cargo module. The area where a fourth radial port could go is set up to allow for a robotic arm. Alternatively, four radial ports with a docking adapter that can support an arm.There is no room in the Cygnus pressure vessel for 4 radial ports. This was why OATK/NG proposed a 4.5 meter diameter module for the habitat/node, it wasn't selected for this though. There will be exactly two axial ports and either 0, 1, or 2 radial ports, pending decision by NASA. Probably 2. Hypothetically if there were 4 ports, and if the phase 1 Gateway had an arm, there is no reason one of those ports would be consumed by the arm either for launch or operations
The advantage of an arm attached to a NASA Docking Port is simple retro fitting. Satellites not designed to operate an arm can have one fitted in minutes. The IDSS docking system is a strong point and has power, data and command connectors built in.This is not needed for the Gateway since connectors for the arm have been designed in.
HALO will be based on the company’s Cygnus spacecraft used for International Space Station cargo missions; the company used that design in earlier work under NASA’s Next Space Technologies for Exploration Partnerships program. Hartman said HALO will have an extra section, or bay, compared to the current three-bay Cygnus used on cargo missions. That stretched version will provide more volume, he said, and also ensure adequate clearance for its docking ports.
It is obvious NASA will not finish negotiations (price and specs) with NG until 1 october. That is the final date for offering commercial cargo to Gateway. Obviously, in case of NG, is clearly related because of common parts of their Gateway-Cygnus and HALO Cygnus-derived module.Smart move from NASA to wait a couple of weeks. Also for knowing all the offers of the contrators. It lets NASA to have a clearer and global picture of Artemis and Gateway architecture costs.
There are now quite a few HALO renders and diagrams floating about
Most like Omega US which has 2x RL10.
Quote from: TrevorMonty on 11/03/2019 08:30 amMost like Omega US which has 2x RL10.The Omega renders show a dual tank stage with an x-frame, like DCSS. That looks like Centaur 5.
