Yeah the parallel gaps threw me for a loop for a while, but if you think about a motion that's a little bit inwards (closing the gaps) and otherwise axially aft, you get pretty much the macro-nozzle.I even tried at one time (in my head) and even-odd arrangement, where the odds ones extend twice as far as the even ones, and everything shrinks inwards. This is how desperate I got Static radiators would also be beneficial. You need to press the tanks, and that's a great way to grab heat from the engines.Oh Monday, deliver us.
I would hope that SpaceX would consider a lifetime NSF member with engineering degrees as possible crew.
Earlier in this thread - because of Elon's Japanese flag tweet - Yusaku Maezawa's name was thrown about as the potential SpaceX moon traveler. I followed his twitter account, and have since seen a series of tweets I find very interesting. And today... he's put up a cryptic tweet with a picture of his watch here:https://twitter.com/yousuck2020/status/1041135281653465088Note the date/time. 0946 hrs on September the 19th... which if you account for the timezone difference, is 46 minutes after the SpaceX event is due to start. Time for Elon to give a presentation on how BFS now works, and then introduce the customer
tuesday is september 18. the first september 19 that falls on a tuesday is 2023...
This may actually not be mutually exclusive... late 2023 is a rather fitting NET for this sort of crewed lunar mission, at least in SpaceX's 'aspirational' schedule parlance.
No person may operate a reusable launch vehicle (or, as currently, a reusable suborbital rocket) under an experimental permit for carrying any property or human being for compensation or hire.
Elon Musk (@elonmusk)Replying to @johnkoetsierDesign has been changed so the lands on legs that extend from the tips of the three fins, two of which actuate (mostly for pitch control)
Quote from: garcianc on 09/16/2018 05:27 pmThis leads me to think that there would be plenty of other opportunities to support multiple other mission objectives other than tourism.I would hope that the announcement covers that and also that, if anyone from NSF is given the opportunity to ask, they would press SpaceX to discuss any such plans.What other mission objectives do you have in mind? Its seems to me that SpaceX will have only two objectives on this flight: 1. Testing hardware, procedures etc, and 2. Earning money. Though I'm sure that if they have the spare capacity they'll consider taking extra cargo and personnel along for the appropriate fee (see 2).
This leads me to think that there would be plenty of other opportunities to support multiple other mission objectives other than tourism.I would hope that the announcement covers that and also that, if anyone from NSF is given the opportunity to ask, they would press SpaceX to discuss any such plans.
https://twitter.com/elonmusk/status/1041482806600204294QuoteElon Musk (@elonmusk)Replying to @johnkoetsierDesign has been changed so the lands on legs that extend from the tips of the three fins, two of which actuate (mostly for pitch control)7:23 PM - 16 Sep 2018Note: We need an update thread now, there's a lot of discussion.
https://twitter.com/elonmusk/status/1041482806600204294QuoteElon Musk (@elonmusk)Replying to @johnkoetsierDesign has been changed so the lands on legs that extend from the tips of the three fins, two of which actuate (mostly for pitch control)7:23 PM - 16 Sep 2018
Quote from: Robotbeat on 09/17/2018 12:51 amhttps://twitter.com/elonmusk/status/1041482806600204294QuoteElon Musk (@elonmusk)Replying to @johnkoetsierDesign has been changed so the lands on legs that extend from the tips of the three fins, two of which actuate (mostly for pitch control)7:23 PM - 16 Sep 2018Note: We need an update thread now, there's a lot of discussion.Chris already set one up... The man never sleeps!https://forum.nasaspaceflight.com/index.php?topic=46372.0
Quote from: vaporcobra on 09/17/2018 12:27 amThis may actually not be mutually exclusive... late 2023 is a rather fitting NET for this sort of crewed lunar mission, at least in SpaceX's 'aspirational' schedule parlance.Doubly so since the Commercial Space Launch Competitiveness Act of 2015 states: QuoteNo person may operate a reusable launch vehicle (or, as currently, a reusable suborbital rocket) under an experimental permit for carrying any property or human being for compensation or hire.
Currently, commercial spaceflight crew and participants engage in spaceflight operations through “informed consent.” Informed consent regulations require crew and spaceflight participants to be informed, in writing, of mission hazards and risks, vehicle safety record, and the overall safety record of all launch and reentry vehicles. Prior to flight, crew and spaceflight participants must provide their written consent to participate.
I guess I meant a general update thread for BFR, not necessarily just the event. But I guess that explains why we don't have one, yet.
Quote from: Robotbeat on 09/17/2018 01:37 amI guess I meant a general update thread for BFR, not necessarily just the event. But I guess that explains why we don't have one, yet.Might be worth a spin off on specific topics.. eg a new thread on just this "actuated" confirmation and totally separate from the weird petals at the back, and the moon mission. There is probably a fair history behind this idea.. and at the same time it is rare for movable wings to actually be implemented (I think someone brought up one example upthread?)
Quote from: Robotbeat on 09/17/2018 12:51 amhttps://twitter.com/elonmusk/status/1041482806600204294QuoteElon Musk (@elonmusk)Replying to @johnkoetsierDesign has been changed so the lands on legs that extend from the tips of the three fins, two of which actuate (mostly for pitch control)7:23 PM - 16 Sep 2018So the hinged wings help with angle-of-attack(AoA) -- what are the risks from the hinged wings?Can thermal expansion from re-entry heating potentially cause problems for those hinges?I know it's not landing on the Moon - yet - but could that devilish moondust potentially cause problems for those hinges?How do you avoid such problems?
The XB-70 Valkyrie bomber is probably the closest. It has winglets that deflect downward in flight of roughly comparable size.
Quote from: sanman on 09/17/2018 02:03 amQuote from: Robotbeat on 09/17/2018 12:51 amhttps://twitter.com/elonmusk/status/1041482806600204294QuoteElon Musk (@elonmusk)Replying to @johnkoetsierDesign has been changed so the lands on legs that extend from the tips of the three fins, two of which actuate (mostly for pitch control)7:23 PM - 16 Sep 2018So the hinged wings help with angle-of-attack(AoA) -- what are the risks from the hinged wings?Can thermal expansion from re-entry heating potentially cause problems for those hinges?I know it's not landing on the Moon - yet - but could that devilish moondust potentially cause problems for those hinges?How do you avoid such problems?The dust wouldn't really penetrate until after the vehicle has landed on Mars or the Moon. On the return trip, the wings can be actuated before leaving Mars/Moon orbit to ensure they work fine.
Bigger problem is excavating a crater while landing, a problem that is reduced by using this larger legspan.
So the hinged wings help with angle-of-attack(AoA) -- what are the risks from the hinged wings?
Quote from: KelvinZero on 09/17/2018 01:50 amQuote from: Robotbeat on 09/17/2018 01:37 amI guess I meant a general update thread for BFR, not necessarily just the event. But I guess that explains why we don't have one, yet.Might be worth a spin off on specific topics.. eg a new thread on just this "actuated" confirmation and totally separate from the weird petals at the back, and the moon mission. There is probably a fair history behind this idea.. and at the same time it is rare for movable wings to actually be implemented (I think someone brought up one example upthread?)The XB-70 Valkyrie bomber is probably the closest. It has winglets that deflect downward in flight of roughly comparable size.
Perfect excuse to pull the XB-70 reference off the shelf. The compression lift drooping wing tips are around 500 square feet.
Quote from: Robotbeat on 09/17/2018 01:54 amQuote from: KelvinZero on 09/17/2018 01:50 amQuote from: Robotbeat on 09/17/2018 01:37 amI guess I meant a general update thread for BFR, not necessarily just the event. But I guess that explains why we don't have one, yet.Might be worth a spin off on specific topics.. eg a new thread on just this "actuated" confirmation and totally separate from the weird petals at the back, and the moon mission. There is probably a fair history behind this idea.. and at the same time it is rare for movable wings to actually be implemented (I think someone brought up one example upthread?)The XB-70 Valkyrie bomber is probably the closest. It has winglets that deflect downward in flight of roughly comparable size.Perfect excuse to pull the XB-70 reference off the shelf. The compression lift drooping wing tips are around 500 square feet.