kerbiloid Posted January 27, 2020 Share Posted January 27, 2020 (edited) If the seat belts are fastened - no. If not - then the loader has more room to fly than the driver. Edited January 27, 2020 by kerbiloid Quote Link to comment Share on other sites More sharing options...
ARS Posted January 27, 2020 Share Posted January 27, 2020 3 hours ago, kerbiloid said: If the seat belts are fastened - no. If not - then the loader has more room to fly than the driver. LMAO you made my day Quote Link to comment Share on other sites More sharing options...
DDE Posted January 27, 2020 Share Posted January 27, 2020 How to make winter finally come to Moscow? Our top men are on the case! Quote Link to comment Share on other sites More sharing options...
tater Posted January 28, 2020 Share Posted January 28, 2020 (edited) Tomorrow night (said tonight by mistake): Edited January 28, 2020 by tater Quote Link to comment Share on other sites More sharing options...
tater Posted January 28, 2020 Share Posted January 28, 2020 Quote Link to comment Share on other sites More sharing options...
kerbiloid Posted January 28, 2020 Share Posted January 28, 2020 Tomorrow they'll figure out, who's a chicken. Quote Link to comment Share on other sites More sharing options...
tater Posted January 28, 2020 Share Posted January 28, 2020 Quote Link to comment Share on other sites More sharing options...
mikegarrison Posted January 29, 2020 Share Posted January 29, 2020 I'm not worried. If they pass through each other between physics tics, they will be fine. Quote Link to comment Share on other sites More sharing options...
wumpus Posted January 29, 2020 Share Posted January 29, 2020 Anybody know where the "best" part of the atmosphere to renter is (or at least best place to burn off the most velocity)? Is it the mesopause (lowest temperature, about 200K) or the stratopause (higher temperature ~275K, but more than twice the pressure). I suspect the stratopause, considering that all that heat comes from adiabatic heating. If they reach nearly the same pressure, you will be cooler in the stratopause (don't know if they will reach the same pressure). Or do you often have somewhere between each the "best" place? Quote Link to comment Share on other sites More sharing options...
mikegarrison Posted January 29, 2020 Share Posted January 29, 2020 2 hours ago, wumpus said: Anybody know where the "best" part of the atmosphere to renter is (or at least best place to burn off the most velocity)? Is it the mesopause (lowest temperature, about 200K) or the stratopause (higher temperature ~275K, but more than twice the pressure). I suspect the stratopause, considering that all that heat comes from adiabatic heating. If they reach nearly the same pressure, you will be cooler in the stratopause (don't know if they will reach the same pressure). Or do you often have somewhere between each the "best" place? Depends. Are you more worried about g-loading or shedding heat? If it's heat you are worried about, go steep and get to the thicker air ASAP, but accept you will get massive g-loading. You'll dump your energy quickly, which will mean you shed your heat before a lot of it can transfer to the re-entry vehicle. If g-loading is a concern, go shallow. But in that case, you'll experience a much longer time in the heating window, which will transfer more heat to your re-entry vehicle (so you need better heat shielding). Quote Link to comment Share on other sites More sharing options...
tater Posted January 29, 2020 Share Posted January 29, 2020 No bueno: Up that tweet thread: Quote Link to comment Share on other sites More sharing options...
DDE Posted January 29, 2020 Share Posted January 29, 2020 1 hour ago, tater said: No bueno: This is how I imagine it now: Quote Link to comment Share on other sites More sharing options...
tater Posted January 29, 2020 Share Posted January 29, 2020 https://www.technologyreview.com/s/615113/these-are-the-highest-resolution-photos-of-the-sun-ever-taken/?utm_medium=tr_social&utm_campaign=site_visitor.unpaid.engagement&utm_source=Facebook&fbclid=IwAR3Oa34fTKc9irU6OLK_9V4K5Rb_GQmxHDgLiV6e2WQfx7aAHpHTTKcfzaM#Echobox=1580323290 Quote Link to comment Share on other sites More sharing options...
tater Posted January 29, 2020 Share Posted January 29, 2020 (edited) Edited January 29, 2020 by tater Quote Link to comment Share on other sites More sharing options...
tater Posted January 29, 2020 Share Posted January 29, 2020 Quote Link to comment Share on other sites More sharing options...
mikegarrison Posted January 29, 2020 Share Posted January 29, 2020 5 minutes to go. Quote Link to comment Share on other sites More sharing options...
tater Posted January 29, 2020 Share Posted January 29, 2020 It happened or it didn't... Quote Link to comment Share on other sites More sharing options...
mikegarrison Posted January 29, 2020 Share Posted January 29, 2020 2 minutes ago, tater said: It happened or it didn't... -- Erwin Schrödinger Quote Link to comment Share on other sites More sharing options...
tater Posted January 30, 2020 Share Posted January 30, 2020 Quote Link to comment Share on other sites More sharing options...
Dirkidirk Posted January 30, 2020 Share Posted January 30, 2020 38 minutes ago, tater said: that's a relief, I wonder what would have happened if they did collide. Probably not much. Spoiler or a lot! Quote Link to comment Share on other sites More sharing options...
kerbiloid Posted January 30, 2020 Share Posted January 30, 2020 (edited) Quote 47 meter predicted miss distance The word "miss" looks wonderful in this context... Btw, which result we should treat as "successful"? Edited January 30, 2020 by kerbiloid Quote Link to comment Share on other sites More sharing options...
mikegarrison Posted January 30, 2020 Share Posted January 30, 2020 6 minutes ago, kerbiloid said: Btw, which result we should treat as "successful"? If the weather prediction says 40% chance of rain, was it wrong if it does rain? How about if it doesn't rain, was it wrong then? Quote Link to comment Share on other sites More sharing options...
kerbiloid Posted January 30, 2020 Share Posted January 30, 2020 6 minutes ago, mikegarrison said: If the weather prediction says 40% chance of rain, was it wrong if it does rain? How about if it doesn't rain, was it wrong then? Did we "aim" to say "miss"? Quote Link to comment Share on other sites More sharing options...
K^2 Posted February 2, 2020 Share Posted February 2, 2020 On 1/28/2020 at 4:29 PM, wumpus said: Anybody know where the "best" part of the atmosphere to renter is (or at least best place to burn off the most velocity)? Is it the mesopause (lowest temperature, about 200K) or the stratopause (higher temperature ~275K, but more than twice the pressure). I suspect the stratopause, considering that all that heat comes from adiabatic heating. If they reach nearly the same pressure, you will be cooler in the stratopause (don't know if they will reach the same pressure). Or do you often have somewhere between each the "best" place? Re-entry is so energetic that temperature of atmosphere makes almost no difference at all. Only density. All of the interesting things are happening in the shockwave, and its temperature is basically determined by density and speed of the craft. Shape also plays a role there, but maintaining a dense, slow moving (relative to the craft) shockwave far ahead of the shield is more important, so blunt shapes are practically universal. @mikegarrison covered the rest in his reply. Quote Link to comment Share on other sites More sharing options...
kerbiloid Posted February 2, 2020 Share Posted February 2, 2020 The temperature defines the speed of sound in the medium.https://en.wikipedia.org/wiki/Speed_of_sound#Practical_formula_for_dry_air As the reentry happens on Hyper- and Super-Sonic Spoiler speed, the temperature affects the aerobraking via the local speed of sound in the external medium. Quote Link to comment Share on other sites More sharing options...
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