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manboy
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« Reply #60 on: 06/21/2012 03:20 AM » |
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Your NDS mechanism isn't too accurate (looks like you based your drawing off of SpaceX's). Why are you make these slides anyway?
Sounds as if you want to discourage this commendable effort?
Grazie davvero for the slides Giuseppe!
Nope. I was just curious.
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Robotbeat
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« Reply #61 on: 06/21/2012 04:36 AM » |
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bravo archipeppe68
Does anyone know if SpaceX has done the wind tunnel testing of the superDraco LAS pods on Dragon Rider?
Probably. I believe they have done or have a deal to do wind tunnel testing to support Grasshopper. It'd only be logical if they did some for crewed Dragon.
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archipeppe68
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« Reply #62 on: 06/21/2012 07:36 AM » |
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Sounds as if you want to discourage this commendable effort?
Grazie davvero for the slides Giuseppe!
Grazie a te!!! Regarding the NDS representation manboy was right, my early version wasn't accurate at all, thanks to his reference material I improved my drawings.
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archipeppe68
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« Reply #63 on: 06/21/2012 07:38 AM » |
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Great effort. Thanks for putting this together. Are you happy for others to copy and use in presentations, etc?
No problem, you can circulate such presentation (and all the other stuff I usually produce). The only thing I ask is to respect the copyright leaving the author's name. No more than that...
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Chandonn
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« Reply #64 on: 06/21/2012 12:46 PM » |
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Here it is the whole presentation re-worked, including all the inputs and suggestion come in the last day (up to the NDS mechanism for DragonRider).
I hope you don't mind: I've repackaged your latest graphics as a PDF file: so people can access it easier than having to download 20 slides... Very nice presentation, BTW ! [EDIT: new file posted below: http://forum.nasaspaceflight.com/index.php?topic=29182.msg919880#msg919880]
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archipeppe68
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« Reply #65 on: 06/21/2012 12:50 PM » |
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I hope you don't mind: I've repackaged your latest graphics as a PDF file: so people can access it easier than having to download 20 slides...
Very nice presentation, BTW !
Never mind, many thanks for the help. It would be really usuful to have all of them at once. 
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archipeppe68
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« Reply #66 on: 06/21/2012 01:45 PM » |
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Following the advice of Chandonn, I've printed out the whole presentation directly in pdf format. It should works better than the pdf obtained by the jpg images.
Let me know what do you think about it.
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mrbliss
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« Reply #67 on: 06/21/2012 02:44 PM » |
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Very nice work! I love all the artwork, multiple views. Minor nit ... on slide 12, the payload ... er, crew ... should be green to match the legend. 
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Comga
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« Reply #68 on: 06/21/2012 04:19 PM » |
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At the risk of propagating JPEG artifacts, this is your diagram with the pontoon ejections moved to the solar array deployment. Also attached a schedule of events, although I can't recall the original source.
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Robotbeat
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« Reply #69 on: 06/21/2012 04:53 PM » |
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bravo archipeppe68
Does anyone know if SpaceX has done the wind tunnel testing of the superDraco LAS pods on Dragon Rider?
Probably. I believe they have done or have a deal to do wind tunnel testing to support Grasshopper. It'd only be logical if they did some for crewed Dragon.
Responding to myself, here's from SpaceX's website (circa 2007): http://www.spacex.com/updates_archive.php?page=121007Falcon 9 Wind Tunnel Testing "Over one hundred years ago, the Wright brothers built small wind tunnels to study the aerodynamics of potential wing designs for their first Flyer. Even in this digital age, where we use computers to perform massive and highly detailed simulations of aerodynamic forces, we still look to wind tunnel data to verify and validate our digital models. 1:33 scale model of Falcon 9 with 17 foot diameter payload fairing To that end, we recently tested a 5 foot long Falcon 9 model in one of the few remaining wind tunnels capable of moving air at over three times the speed of sound. Built in the 1950’s, the venerable North American Trisonic Wind Tunnel happened to be located just blocks from our old El Segundo headquarters, and provided us with the ability to test a variety of Falcon 9 configurations, including both the large 17 foot fairing design and the Dragon capsule models." (By the way, the wind tunnel was demolished in 2009)
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BrightLight
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« Reply #70 on: 06/21/2012 04:58 PM » |
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bravo archipeppe68
Does anyone know if SpaceX has done the wind tunnel testing of the superDraco LAS pods on Dragon Rider?
Probably. I believe they have done or have a deal to do wind tunnel testing to support Grasshopper. It'd only be logical if they did some for crewed Dragon.
Responding to myself, here's from SpaceX's website (circa 2007):
http://www.spacex.com/updates_archive.php?page=121007
Falcon 9 Wind Tunnel Testing
"Over one hundred years ago, the Wright brothers built small wind tunnels to study the aerodynamics of potential wing designs for their first Flyer. Even in this digital age, where we use computers to perform massive and highly detailed simulations of aerodynamic forces, we still look to wind tunnel data to verify and validate our digital models.
1:33 scale model of Falcon 9 with 17 foot diameter payload fairing
To that end, we recently tested a 5 foot long Falcon 9 model in one of the few remaining wind tunnels capable of moving air at over three times the speed of sound. Built in the 1950’s, the venerable North American Trisonic Wind Tunnel happened to be located just blocks from our old El Segundo headquarters, and provided us with the ability to test a variety of Falcon 9 configurations, including both the large 17 foot fairing design and the Dragon capsule models."
(By the way, the wind tunnel was demolished in 2009)
Probably. The Super Draco pods at high Mach number might be an issue, if they validated there CFD code with these tunnel runs they might be able to predict the characteristics and perturbations caused by the pods.
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archipeppe68
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« Reply #72 on: 06/21/2012 07:34 PM » |
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At the risk of propagating JPEG artifacts, this is your diagram with the pontoon ejections moved to the solar array deployment. Also attached a schedule of events, although I can't recall the original source.
Thanks Comga, I had the same table. My guess is that SpaceX doesn't want to have the two pontoons in orbit with Dragon because they can easily become "space debris" against the current regulation on this matter. The solar array deployment doesn't mean, automatically, that the pontoons are jettisoned at that point, only that the solar panel deployment mechanism enter in action. The two pontoons have the same purpose of the shroud for a payload satellite, you want to discard them just outside the atmosphere but before you arrive in orbit. OK this is my mind but if I mistake something I will replace that slide asap...
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archipeppe68
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« Reply #73 on: 06/21/2012 07:37 PM » |
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On page 6, what are the grey rectangles on the "back view"?
Also, a view with the protective toothbrush moustache above the philtrum, named "The Brogan", is displayed here:
http://forum.nasaspaceflight.com/index.php?topic=28847.msg896095#msg896095
They are the fruit of my ignorance on Dragon's back side, there must be some sort of containers for the solar panels joint engines and also for the batteries, but you must intend it like a sort of placeholder until SpaceX will release some information about it. Furthermore, thanks to Docmordred, I got an updated image of the C2 heatshield that is not exactly as I represented. I will update the drawings asap.
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Robotbeat
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« Reply #74 on: 06/21/2012 07:37 PM » |
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At the risk of propagating JPEG artifacts, this is your diagram with the pontoon ejections moved to the solar array deployment. Also attached a schedule of events, although I can't recall the original source.
Thanks Comga, I had the same table.
My guess is that SpaceX doesn't want to have the two pontoons in orbit with Dragon because they can easily become "space debris" against the current regulation on this matter.
The solar array deployment doesn't mean, automatically, that the pontoons are jettisoned at that point, only that the solar panel deployment mechanism enter in action.
The two pontoons have the same purpose of the shroud for a payload satellite, you want to discard them just outside the atmosphere but before you arrive in orbit.
OK this is my mind but if I mistake something I will replace that slide asap...
The solar arrays deploy just as the pontoons are jettisoned. They are spring loaded, like spring snakes that shoot out when you open the can.
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