Titan Bumblebee, Small UAV on Titan |
Titan Bumblebee, Small UAV on Titan |
Sep 24 2008, 05:26 AM
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#1
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Member Group: Members Posts: 610 Joined: 23-February 07 From: Occasionally in Columbia, MD Member No.: 1764 |
Since I see Doug
picked up on my Titan Bumblebee talk at EPSC, I've put up some information on it at my website The concept was originated during the 2007 NASA Titan Flagship study when the expectation was for a large long-lived RTG-powered lander in the equatorial dunefields. The UAV would fly off from the lander which could store the image stream from the UAV and then slowly telemeter those GB of data back to Earth over subsequent weeks. (one motivation was that if that architecture - lander plus montgolfiere plus orbiter were descoped, deleting the montgolfiere, the Titan Bumblebee concept still allowed NASA to include a 'flying at Titan' element with low cost and risk. Added coolness would be for the UAV to image the lonely lander sitting in the Titan landscape. Such a UAV is arguably less of a good fit with the present architecture being developed with ESA as a partner providing two in-situ elements (small short-lived battery-powered lake lander plus RTG montgolfiere) although technically it remains quite feasible and there is no reason you couldnt fly it from the montgolfiere - now pictures of that against the Titan landscape would be way cool....! Anyway, I had fun with the idea. |
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Sep 24 2008, 06:09 AM
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#2
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Member Group: Members Posts: 706 Joined: 22-April 05 Member No.: 351 |
Might be interesting to drop bumblebees from the balloon for low elevation looks. Of course, you have to decide where to drop and there is the issue of the bumblebee keeping a certain height above the ground. Ralph, does your concept have any way to determine its elevation? If so, it would be interesting to have a bumblebee drop down from 10 km and survey an area at, say, 100m elevation. Certainly not essential, but its fun to think about.
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Sep 24 2008, 08:39 AM
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#3
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Member Group: Members Posts: 610 Joined: 23-February 07 From: Occasionally in Columbia, MD Member No.: 1764 |
Might be interesting to drop bumblebees from the balloon for low elevation looks. Of course, you have to decide where to drop and there is the issue of the bumblebee keeping a certain height above the ground. Ralph, does your concept have any way to determine its elevation? If so, it would be interesting to have a bumblebee drop down from 10 km and survey an area at, say, 100m elevation. Certainly not essential, but its fun to think about. That's why I suggested a student design competition - to flush out ideas on this sort of question.... you have only to look at the success of the aerial robotics contests to see what students can achieve. A pressure sensor (i.e. barometric altimeter) might be adequate - certainly for 1km accuracy it's ok (when you get to the tens of meters level you need to start taking the atmospheric tide into account!) Radar altimeter is probably too large for such a small vehicle. An ultrasonic altimeter could work - Huygens pinged the surface from 100m - although from a fast-moving platform that may be a less suitable technique. If you know the flightspeed, and can measure the scene motion (e.g. with an optical-mouse based sensor - already experimented with on small UAVs) then you can estimate altitude that way too... or how about a Dambusters approach, with two angled laser beams from the wingtips: by imaging the laser spots on the ground you can estimate the altitude geometrically. Lots of possibilities - The sky is the limit! |
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Sep 24 2008, 09:16 AM
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#4
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Rover Driver Group: Members Posts: 1015 Joined: 4-March 04 Member No.: 47 |
Talking of small UAVs: check this out!
http://www.delfly.nl/ I think they're working on making a model for a future Titan mission too. |
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Sep 24 2008, 10:17 AM
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#5
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Member Group: Members Posts: 809 Joined: 11-March 04 Member No.: 56 |
If they want flight on the ultra-cheap, a couple of struts, a taut, tough fabric, and a windy location are more than sufficient. Add a tether and you have one of the oldest aerial pastimes engaged in by Earthlings.
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Sep 24 2008, 12:55 PM
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#6
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Member Group: Members Posts: 610 Joined: 23-February 07 From: Occasionally in Columbia, MD Member No.: 1764 |
Talking of small UAVs: check this out! http://www.delfly.nl/ I think they're working on making a model for a future Titan mission too. Yes - the delfly is very neat. But as a concept for Titan I don't think it works - its temperature of such a small vehicle is too tightly coupled to that of the environment. The range of such a small vehicle will also be very limited, especially in a headwind. I think 1kg is the sweet spot - big enough that the insulation/thermal power needs close with the propulsion power needs, yet not too big to be frightening as an add-on. (My JBIS paper discusses the rationale for 3-4 hour lifetime, data volume and flight speed giving 100km range - all of these performance parameters are coupled together and to the overall vehicle mass/battery energy) |
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Sep 24 2008, 01:00 PM
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#7
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Founder Group: Chairman Posts: 14432 Joined: 8-February 04 Member No.: 1 |
1kg, even picked arbitrarily, is a good figure as it puts it into the same sort of project scope as a cube-sat, which many universities can finance and fly themselves. Big enough to work, small enough not to be a burden on the lander.
Doug |
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