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Thread: New Mars Cameras
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02-09-2021, 05:47 PM #276
^^^I have a lot of thoughts on the topic, but probably shouldn't put them online. It is risky regardless. But I have never seen an explanation of why the sky crane is better than designing the powered descent stage so the rover sits on top or in and then drives off/out after landing.
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02-09-2021, 11:41 PM #277
Play some Kerbal Space Program. Seriously. Rocket science is really, really, really fucking hard. So many trade offs and it all boils down to deltaV.
As for sky crane vs. lander, it's weight saving (don't need landing legs, just use the rovers wheels and shocks) and a big improvement on the vehicle center of gravity in relation to center of thrust in order to keep the rover wheels side down on landing, especially on uneven terrain. Lots of physics benefits as long as the computers and sensors hold out.I've concluded that DJSapp was never DJSapp, and Not DJSapp is also not DJSapp, so that means he's telling the truth now and he was lying before.
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02-13-2021, 01:48 PM #278
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02-17-2021, 07:59 PM #279
m20 landing in 18 hours! https://mars.nasa.gov/mars2020/
Something about the wrinkle in your forehead tells me there's a fit about to get thrown
And I never hear a single word you say when you tell me not to have my fun
It's the same old shit that I ain't gonna take off anyone.
and I never had a shortage of people tryin' to warn me about the dangers I pose to myself.
Patterson Hood of the DBT's
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02-18-2021, 09:21 AM #280
Oh no, I know exactly whom I was directing that to. That game gets a lot of the physics correct enough to illustrate the bigger points, and can be pretty unforgiving if you're not thoughtful about how you design your ship. It doesn't incorporate Murphy's laws when one of your thrusters fails on decent and throws you into a spin, so at least you have that going for you.
My point of top heavy vs. bottom heavy landers is amplified in KSP in funny explosions with little green people. The number of top heavy landers I've wrecked in that stupid game before I started really paying attention to CoM and CoT on the decent portions led to many hours of frustration. Many landed only to tip over after the thruster shut off because the ground wasn't level enough. Now think about landing a craft with a small car on top of it, on unlevel ground, without a pilot and NOT tipping it over.
Back on point - this is about roll stability in aircraft, but many of the points carry through to descenders. Self stabilizing craft to get the rover to the ground are desirable. The Sky Crane design with a dangling pendulum payload is more stable than many other designs as long as it remains within the flight envelope, which leads to the rover landing rubber side down.
I've concluded that DJSapp was never DJSapp, and Not DJSapp is also not DJSapp, so that means he's telling the truth now and he was lying before.
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02-18-2021, 11:20 AM #281
2.5 hours until landing sequence
Aim for the chopping block. If you aim for the wood, you will have nothing. Aim past the wood, aim through the wood.
http://tim-kirchoff.pixels.com/
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02-18-2021, 01:35 PM #282
14 min to entry
I've concluded that DJSapp was never DJSapp, and Not DJSapp is also not DJSapp, so that means he's telling the truth now and he was lying before.
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02-18-2021, 01:57 PM #283
Touchdown.
The floggings will continue until morale improves.
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02-18-2021, 01:57 PM #284
Sky crane 2 for 2. Congrats NASA & JPL
I've concluded that DJSapp was never DJSapp, and Not DJSapp is also not DJSapp, so that means he's telling the truth now and he was lying before.
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02-18-2021, 02:00 PM #285
Incredible!
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02-18-2021, 02:07 PM #286
Outstanding.
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02-18-2021, 02:10 PM #287
Ohhh yeah Nice work!
Aim for the chopping block. If you aim for the wood, you will have nothing. Aim past the wood, aim through the wood.
http://tim-kirchoff.pixels.com/
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02-18-2021, 02:12 PM #288
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02-18-2021, 02:12 PM #289
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02-18-2021, 02:31 PM #290
They showed the nav cam pictures almost as they were downloading.
All amazing. Congrats to everybody involved.
Also some very smart ladies in that room. I tried to stay focused on the landing.
Sent from my SM-G981U using Tapatalk
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02-18-2021, 03:21 PM #291
the raw images public site is starting to populate:
https://mars.nasa.gov/mars2020/multimedia/raw-images/
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02-18-2021, 05:16 PM #292www.dpsskis.com
www.point6.com
formerly an ambassador for a few others, but the ski industry is... interesting.
Fukt: a very small amount of snow.
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02-18-2021, 05:18 PM #293www.dpsskis.com
www.point6.com
formerly an ambassador for a few others, but the ski industry is... interesting.
Fukt: a very small amount of snow.
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02-18-2021, 08:03 PM #294
Last edited by 406; 02-18-2021 at 10:18 PM.
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02-18-2021, 10:20 PM #295
Also check out:
https://www.missionjuno.swri.edu/junocam/processing/
The raw images get posted there and public can process and upload.
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02-19-2021, 10:22 AM #296
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02-19-2021, 11:23 AM #297
FUCK YEAH. Lifted from Perseverance's twitter feed
I've concluded that DJSapp was never DJSapp, and Not DJSapp is also not DJSapp, so that means he's telling the truth now and he was lying before.
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02-19-2021, 11:33 AM #298
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02-19-2021, 11:42 AM #299
Bravo mag. Amazing shit.
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02-19-2021, 11:42 AM #300
view from orbit:
https://www.uahirise.org/releases/perseverance/
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