Page 5 of 5 FirstFirst ... 45
Results 141 to 157 of 157

Thread: Perseverance rover only three weeks from Mars

  1. #141
    Join Date
    May 2010
    Location
    Victoria BC
    Posts
    17,843

    Default Re: Perseverance rover only three weeks from Mars

    Quote Originally Posted by AndyG View Post
    Whoosh. Bang. Thwump. Wind. Roar. Crackle. Whizz. Bump. Bang. Diminishing crackle. Wind (lighter than before). Silence.

    That do you?

    Andy
    I may need to take up smoking again.

  2. #142
    Join Date
    Mar 2011
    Location
    The Now
    Posts
    3,357

    Default Re: Perseverance rover only three weeks from Mars

    Eu3HnBVWYAEyugm.jpg

    There's a code in the pattern of the parachute panels. It reads:

    "Dare mighty things".

    ...How awesome!

    Andy
    "In case of fire ring Fellside 75..."

  3. #143
    Join Date
    Jun 2003
    Location
    Fredericton, New Brunswick
    Posts
    45,064

    Default Re: Perseverance rover only three weeks from Mars

    If I use the word "God," I sure don't mean an old man in the sky who just loves the occasional goat sacrifice. - Anne Lamott

  4. #144
    Join Date
    Jun 2003
    Location
    Fredericton, New Brunswick
    Posts
    45,064

    Default Re: Perseverance rover only three weeks from Mars

    Tweet from Prof. Paul Byrne
    You guys, the Mastcam-Z instrument on @NASAPersevere is showing us some *amazing* views from Mars
    If I use the word "God," I sure don't mean an old man in the sky who just loves the occasional goat sacrifice. - Anne Lamott

  5. #145
    Join Date
    Mar 2010
    Location
    central cal
    Posts
    20,932

    Default Re: Perseverance rover only three weeks from Mars

    Quote Originally Posted by TomF View Post
    Tweet from Prof. Paul Byrne

    Sooga. SOOGA!

  6. #146
    Join Date
    Jan 2002
    Location
    victoria, australia. (1 address now)
    Posts
    65,364

    Default Re: Perseverance rover only three weeks from Mars

    Thos guys sure do get around…….


  7. #147
    Join Date
    Apr 2009
    Location
    Mountain lakes of Vermont
    Posts
    15,950

    Default Re: Perseverance rover only three weeks from Mars

    When they gonna fly that copter?
    I was born on a wooden boat that I built myself.

  8. #148
    Join Date
    May 2010
    Location
    Victoria BC
    Posts
    17,843

    Default Re: Perseverance rover only three weeks from Mars

    Perseverance is getting ready to deploy Ingenuity and NASA will reveal the details of its first attempt at flight sometime tomorrow.

    This is a picture of the now discarded debris shield that protected the helicopter throughout the landing. The Rover will drive for a few days to the launch sight where is will reorient Ingenuity, it's currently stowed on its side, and lower to the surface. Fun fact: the rotor on Ingenuity is 4 feet and it will spin up to 2,500 RPM, about five times faster than it would need to spin to create the same amount of lift here on Earth.



    https://www.theverge.com/2021/3/22/2...ity-helicopter
    Last edited by Old Dryfoot; 03-22-2021 at 11:22 PM.

  9. #149
    Join Date
    May 2010
    Location
    Victoria BC
    Posts
    17,843

    Default Re: Perseverance rover only three weeks from Mars

    Unfolded, reoriented, and waiting to be lowered to the surface. Ingenuity's first flight will be a 30-second hover some 10 feet high and will occur on the 8th.

    https://www.space.com/mars-helicopte...ce-rover-video


  10. #150
    Join Date
    Mar 2010
    Location
    central cal
    Posts
    20,932

    Default Re: Perseverance rover only three weeks from Mars

    Quote Originally Posted by Old Dryfoot View Post
    Perseverance is getting ready to deploy Ingenuity and NASA will reveal the details of its first attempt at flight sometime tomorrow.

    This is a picture of the now discarded debris shield that protected the helicopter throughout the landing. The Rover will drive for a few days to the launch sight where is will reorient Ingenuity, it's currently stowed on its side, and lower to the surface. Fun fact: the rotor on Ingenuity is 4 feet and it will spin up to 2,500 RPM, about five times faster than it would need to spin to create the same amount of lift here on Earth.



    https://www.theverge.com/2021/3/22/2...ity-helicopter

    Whew!

    I thought they dropped an oil pan!

  11. #151
    Join Date
    Aug 2004
    Location
    Cantão - Brazil
    Posts
    13,956

    Default Re: Perseverance rover only three weeks from Mars

    Fun fact: the rotor on Ingenuity is 4 feet and it will spin up to 2,500 RPM, about five times faster than it would need to spin to create the same amount of lift here on Earth.
    Since the atmosphere here is over 100 times denser, I suppose that lift is proportional to a power function of rotation speed. Didn't know that.

  12. #152
    Join Date
    Mar 2010
    Location
    central cal
    Posts
    20,932

    Default Re: Perseverance rover only three weeks from Mars

    Quote Originally Posted by George. View Post
    Since the atmosphere here is over 100 times denser, I suppose that lift is proportional to a power function of rotation speed. Didn't know that.
    They likely need less overall lift, too, eh? Less dense medium would require less lift overall, right?

    This is not a Bilge “gotcha”.

    I learn a **** ton of stuff here.

  13. #153
    Join Date
    May 2002
    Location
    the hills
    Posts
    60,462

    Default Re: Perseverance rover only three weeks from Mars

    Quote Originally Posted by Old Dryfoot View Post
    Unfolded, reoriented, and waiting to be lowered to the surface. Ingenuity's first flight will be a 30-second hover some 10 feet high and will occur on the 8th.

    https://www.space.com/mars-helicopte...ce-rover-video

    what gets me is that 2/3 of the batteries capacity is devoted to just keeping the batteries and electronics warm.

  14. #154
    Join Date
    Jul 2011
    Location
    Isle of Mull, Scotland
    Posts
    8,076

    Default Re: Perseverance rover only three weeks from Mars

    Quote Originally Posted by amish rob View Post
    They likely need less overall lift, too, eh? Less dense medium would require less lift overall, right?

    This is not a Bilge “gotcha”.

    I learn a **** ton of stuff here.
    Less lift needed, as less gravity on Mars compared to Earth.

  15. #155
    Join Date
    Mar 2010
    Location
    central cal
    Posts
    20,932

    Default Re: Perseverance rover only three weeks from Mars

    Quote Originally Posted by birlinn View Post
    Less lift needed, as less gravity on Mars compared to Earth.
    Yeah, I knew that. I also imagine less overall drag from atmosphere provides less lift, but requires less, too?

    I don’t know. I don’t even understand how helicopters work on EARTH!

  16. #156
    Join Date
    Mar 2011
    Location
    The Now
    Posts
    3,357

    Default Re: Perseverance rover only three weeks from Mars

    ...but the thin atmosphere supports less lift than the gain provided by the lower gravity. Where you really want to be flying is Titan. 14% of Earth's gravity, 150% of Earth's atmospheric pressure at the surface. Too cold? Try ballooning on Venus at about 50km. 1 bar, temperature ok, and breathable air is a lifting gas. Win-win-win.

    Andy
    "In case of fire ring Fellside 75..."

  17. #157
    Join Date
    Mar 2010
    Location
    central cal
    Posts
    20,932

    Default Re: Perseverance rover only three weeks from Mars

    Quote Originally Posted by AndyG View Post
    ...but the thin atmosphere supports less lift than the gain provided by the lower gravity. Where you really want to be flying is Titan. 14% of Earth's gravity, 150% of Earth's atmospheric pressure at the surface. Too cold? Try ballooning on Venus at about 50km. 1 bar, temperature ok, and breathable air is a lifting gas. Win-win-win.

    Andy
    I DO want to be flying on Titan. I do.

    Don’t truth me.

    Peace,
    Chrono

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •