Discussion in 'Too Hot for Swamp Gas' started by 96Gatorcise, Jul 30, 2020.
Safe travels to Perseverance heading to Mars
It has a drone
After the descent stage fueling, the system that will deliver the Mars Helicopter to the surface of the Red Planet was integrated with Perseverance. The helicopter, which weighs 4 pounds (1.8 kilograms) and features propellers 4 feet (1.2 meters) in diameter, is cocooned within the delivery system. In one of the first steps in the day-long process on April 6, technicians and engineers made 34 electrical connections between the rover, the helicopter and its delivery system on the rover's belly. After confirming data and commands could be sent and received, they attached the delivery system to the rover.
Finally, the team confirmed the helicopter could receive an electrical charge from the rover. Before being deployed onto the surface of Jezero Crater, the Mars Helicopter will rely on the rover for power. Afterward, it will generate its own electrical power through a solar panel located above its twin counter-rotating propellers.
The helicopter will remain encapsulated on the rover's belly for the next year and will be deployed around the beginning of May — roughly two-and-a-half months after Perseverance's landing. Once the rover drives about 330 feet (100 meters) away and the helicopter undergoes an extensive systems check, it will execute a flight-test campaign for up to 30 days.
The drone will bring great data for NASA and I'm sure amazing pictures. Man on Mars in 2030 according to some, like.
They said it's mostly going to send telemetry, not many pictures. Its basically just to test whether it works on Mars to learn for future missions. The atmosphere is about 1% of ours while the gravity is about .6 I think. So the rotors need to move very fast to generate lift while the craft has to be very light.
This was the big inaccuracy of The Martian. Because of the thin atmosphere, there are no dust storms on Mars powerful enough to tip over a big ascent rocket.
That and creating water by decomposing hydrazine and burning the resulting hydrogen works, but produces way too much heat. He would have turned the HAB into an oven.
Funny, that was my immediate thought when I heard the NASA lady mention the atmospheric pressure when talking about this thing. Also how the hell were the Martians supposed to go from almost no atmosphere to breathable in The Expanse.
Imagine being the first person on earth to pilot a drone in the Martian atmosphere.
I was listening earlier and they essentially said you could send a mission to Mars every 5-6 months indefinitely. Pretty cool
3/8ths of Earth's gravity.
I didn't realize the atmosphere was that thin. I knew the gravity was lighter, it that the reason for the thin atmosphere?
A couple of videos on Perseverance linked in this thread:
This is stunning.....surface of Mars in 4K
That helicopter is no small task. Flying a helicopter in Mar's atmosphere at the surface is like flying one at 100,000 feet on Earth. The highest a helicopter can fly on Earth is approximately 30,000 feet....they normally hover at 10,000 max.
Whoa, you mean that wasn't a documentary?
I think partially. There is some kind of explanation on Wikipedia but it's all in science talk.
Totally true. What I found cool is that Andy Weir was humble enough to admit it!
"In reality, Mars' atmosphere is 1/200th the density of Earth's. So while they do get 150 km/hr sandstorms, the inertia behind them — because their air is so thin — it would feel like a gentle breeze on Earth. A Martian sandstorm can't do any damage. And I knew that at the time I wrote it.
So I went ahead and made that deliberate concession to reality, figuring, "Ah, not that many people will know it." And then now that the movie's come out, all the experts are saying, "Hey, everyone should be aware that this sandstorm thing doesn't really work and Mars isn't like that."
So I have inadvertently educated the public about Martian sandstorms. And I feel pretty good about that."
Missed it and I was doing my morning walk.
Partially. Research for exact answers is still underway, but basically Mars lacks the internal electric dynamo that Earth has. Either the core cooled more because it was farther from the sun, and/or it lacks as much metal due to initial composition, and/or the planet is smaller. At any rate, it does not create a strong magnetic field and the pressure of energy from the sun has slowly stripped away the atmosphere. Meteorite strikes, maybe some giant ones, probably helped too, and the thinner atmosphere and lower gravity compared to Earth allowed ejected gases to escape.
Hope they find my super ex-girlfriend up there.
Will never happen. It takes EM(light, radio waves etc) between 3 - 22 minutes to go from Earth to Mars depending their orbit around the Sun.
Love this thread.
Mars’ magnetic field shut down (dynamo, as thegator92 said) for some reason, possibly because of it’s size (much smaller than Earth) and the sun stripped the light gasses away. Imagine how precarious our atmosphere is, especially considering Venus which is a runaway greenhouse.