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Mars Space Science

Aerial Drone To Hunt For Life On Mars 152

Posted by Soulskill
from the care-for-some-martian-venison dept.
astroengine writes "What if the Martian terrain is too rugged for a rover to traverse? How do we study surface features that are too small for an orbiter to resolve? If selected by NASA, the Aerial Regional-Scale Environment Surveyor (ARES) could soar high above the Martian landscape, getting a unique birds-eye view of the Red Planet. Its primary mission is to sniff out potential microbial-life-generating gases like methane, but it would also be an ideal reconnaissance vehicle to find future landing sites for a manned expedition. Prototypes of the rocket-powered drone have been successfully flown here on Earth, so will we see ARES on Mars any time soon?"
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Aerial Drone To Hunt For Life On Mars

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  • Any time soon? (Score:4, Interesting)

    by fructose (948996) on Monday November 15, 2010 @05:14PM (#34235684) Homepage

    Not likely. This project has been around for several years now. Here's [foxnews.com] a story where they hope to get DARPA to pay for it. And it's was already around for years before that. The problem with it? Real time control. The plane would have to be able to direct it's own flight and research with minimal input from Earth becasue of the time lag in commands. Controlling a Global Hawk or Predator from half way around the world isn't tough. Flying a UAV on another planet? That's tough. Look what happened to poor Spirit [wikipedia.org].

  • by GodfatherofSoul (174979) on Monday November 15, 2010 @05:19PM (#34235738)

    Yeah, I'm sure it's not practical, but Mars apparently has some jaw-dropping vistas. I'd love to see a robotic blimp traversing the planet snapping pictures.

  • by Anonymous Coward on Monday November 15, 2010 @05:28PM (#34235868)

    Or they're testing a full-scale model in one of their low speed wind tunnels and this is just another example of shitty science reporting. It is important to note that the atmosphere on Mars is significantly thinner than the one here on Earth, and wind tunnel testing usually uses Reynolds number as a similarity parameter rather than velocity, so it's completely possible that 100 mph in their wind tunnel is equivalent to 500 mph flight somewhere on Mars.

  • Re:Rocket-powered? (Score:5, Interesting)

    by vlm (69642) on Monday November 15, 2010 @05:39PM (#34235984)

    I'm no expert, but since the atmospheric pressure on Mars is so low propellers/balloons etc probably won't work very well.

    Jet engines work pretty well at low pressure with some cooling issues. The killer is you need something that burns in mostly carbon dioxide (liquid fluorine?)

    The killer for propellers is its just a rotating airfoil (like a helicopter blade) and the speed of sound drops with density. And classical prop designs are an utter failure when supersonic.

    The killer for balloons is a completely different problem, the overall vehicle needs to be less dense than the atmosphere it displaces. Which is just barely possible to do on earth. Not going to work on Mars.

    Flying on Mars is non-trivial. See the X-Plane guys

    http://www.x-plane.com/adventures/mars.html [x-plane.com]

  • Re:Rocket-powered? (Score:1, Interesting)

    by Anonymous Coward on Monday November 15, 2010 @05:54PM (#34236130)

    I'm no expert, but since the atmospheric pressure on Mars is so low propellers/balloons etc probably won't work very well.

    By the same token, (no, I didn't RTFA) it seems the thin atmosphere would supply little purchase for propellers, nor enough lift to get anything off the ground.

    Interesting factoid -- The longest flight in the world of commercial aviation is NY to Johannesburg. A plane can leave NY (at near sea level) and make the flight on a single load of fuel. However, on the way back, the Johannesburg airport is at such an altitude that the fully loaded plane cannot take off in the thin air. Hence, they start with a partial load of fuel and stop en route to top off to make the rest of the trip to NY.

    Info from "Ask the Pilot: Everything You Need to Know About Air Travel" [Paperback] Patrick Smith (Author) -- $10.20 at Amazon.

  • Re:Rocket-powered? (Score:3, Interesting)

    by MichaelSmith (789609) on Monday November 15, 2010 @05:56PM (#34236164) Homepage Journal

    On Earth: The density of air at sea level is about 1.2 kg/m3
    Divide by 100 (pressure difference) times 3 (lower gravity) gives 0.03 kg/m^3. Bump it up to 0.1 kg/m^3 because its CO2 (higher density) and lower temperature. So you have 12 times less lifting capability compared to Earth but one third the gravity so you will need four times the volume of the balloon for the same lifting capacity.

    I suppose its doable but remember the weather balloon which got away from its handlers in Australia some time back. If this one has to launch from the ground without people holding the wires then there are going to be some problems.

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