Beagle 2 in HiRISE, Possible Targets |
Beagle 2 in HiRISE, Possible Targets |
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#1
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![]() Administrator ![]() ![]() ![]() ![]() Group: Admin Posts: 5172 Joined: 4-August 05 From: Pasadena, CA, USA, Earth Member No.: 454 ![]() |
EDIT: Moved these posts from the Feb 14 HiRISE Release thread to here to collect all Beagle 2 search related stuff in one place.
I'm downloading them now too -- guess I can't blog about them until I've examined them very carefully! For a bit of history on the search, Here's a blog entry I wrote about this spot a while ago Here's the MOC team's take on that spot And here's the BBC page with the Beagle 2 team's take on it EDIT: and here's my updated blog entry with links to the Beagle 2 landing ellipse images split up into 40-MB chunks. --Emily -------------------- My website - My Patreon - @elakdawalla on Twitter - Please support unmannedspaceflight.com by donating here.
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#2
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![]() Senior Member ![]() ![]() ![]() ![]() Group: Members Posts: 1229 Joined: 24-December 05 From: The blue one in between the yellow and red ones. Member No.: 618 ![]() |
Spinnaker ripstop nylon has a coating which renders it non-porous.
At least, at sailing yacht windspeeds. ![]() -------------------- My Grandpa goes to Mars every day and all I get are these lousy T-shirts!
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#3
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![]() Member ![]() ![]() ![]() Group: Members Posts: 611 Joined: 23-February 07 From: Occasionally in Columbia, MD Member No.: 1764 ![]() |
Spinnaker ripstop nylon has a coating which renders it non-porous. At least, at sailing yacht windspeeds. ![]() A parachute has porosity on a macro-scale (e.g. in a ribbon parachute, or the gap in a disk-gap-band chute) and on the microscale (the permeability of the fabric itself). Both are important in inflation, drag and stability performance : zero porosity is typically rather bad. Note that at the low Reynolds numbers characteristic of Mars flight, what looks like a porous fabric does not, in fact, behave as such since the viscous nature of the flow reduces the effective permeability. |
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#4
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![]() Senior Member ![]() ![]() ![]() ![]() Group: Members Posts: 1229 Joined: 24-December 05 From: The blue one in between the yellow and red ones. Member No.: 618 ![]() |
zero porosity is typically rather bad. Would you care to elaborate on your concerns? Stuart H says the material was tested on earth. Can we assume that means appropriate wind-tunnel or drop tests? -------------------- My Grandpa goes to Mars every day and all I get are these lousy T-shirts!
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#5
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Junior Member ![]() ![]() Group: Members Posts: 39 Joined: 26-March 09 From: Cornwall Member No.: 4697 ![]() |
Would you care to elaborate on your concerns? Zero-porosity means all the air entering the parachute has to leave again at the edge. It is difficult to impossible to get this to happen uniformly, and non-uniform edge venting leads to the parachute swinging from side to side. |
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