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HomeAircraftHelicopterMain Discussion › Mars Helicopter to Fly on NASA's Next Red Planet Rover Mission
05-15-2018 10:52 PM  3 months agoPost 21
RM3

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Killeen, Texas - USA

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I good question would be: what if the drone does find a very interesting place to investigate further... But the location is inaccessible to the rover... what then? build a drone with the equipment the rover has for sample testing etc? with the air already 100x thinner than here on earth... building a drone that can lift that much equipment plus itself may just be out of reach... or its rotors will be so big as to make the craft ungainly and a nightmare to get into tight places.

showing a preference will only get you into trouble, 90% of everything is crap...

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05-15-2018 11:52 PM  3 months agoPost 22
ssmith512

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Indianapolis, IN USA

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wjvail
You say "lift is lift regardless of the medium" but that assumes there is a medium. I've noticed a lack of propellers on space craft.
Last time I checked Mars has an atmosphere, therefore a medium in which to produce lift/thrust. Also gravity on Mars is something like 40% of that on Earth. "Robustness" on Mars is not the same as "robustness" on Earth.

Steve

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05-16-2018 01:15 AM  3 months agoPost 23
RM3

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ssmith512
has an atmosphere,
Not much... 100 times thinner. So not impossible, but very difficult, so the design must compensate for that. It may too much to ask for anything other than a small vehicle with no more than a camera

showing a preference will only get you into trouble, 90% of everything is crap...

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05-16-2018 01:32 AM  3 months agoPost 24
wjvail

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Meridian, Mississippi

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ssmith512
Last time I checked Mars has an atmosphere, therefore a medium in which to produce lift/thrust.
Well then I suppose we are talking about the semantics of "atmosphere". I suppose we are arguing the same point but it's a matter of degrees.

The Earth has an atmosphere that contains multiple layer and extends up to 10,000km. One layer of our atmosphere is the Troposphere. It is the layer of Earth's atmosphere between the Mesosphere and Exosphere. I suppose you are factually correct to suggest there is "a medium in which to produce lift/thrust" in the Troposphere. As long as there are molecules for blades to push against, there is an opportunity for lift/thrust. But as I said in a previous post, I don't know if I would assume it would be simple to produce a craft to operate there.

I can't argue that Mars doesn't have an atmosphere. It does. That is fact. It's just a question of degrees. What I suggest is that Mar's atmosphere is thin enough that wandering about in it with a rotary craft is anything but "easy". In fact, I'm suggesting that the enterprise is difficult enough to ask the question, what is to be gained by doing so?

https://en.wikipedia.org/wiki/Atmosphere

"Well, Nothing bad can happen now."

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