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#1 2018-06-30 17:19:41

SpaceNut
Administrator
From: New Hampshire
Registered: 2004-07-22
Posts: 21,310

The difficulty of landing for Mars

The curent status of a mars landing are direct, or after a capture followed by a very quick journey to the surface. The use of an aeroshell made of a heatshield and backshell are standard application for the sweet of rovers and landers that have made it to its surface. Once slowed down a bit in the atmosphere by the heatshield the back shell is ejected and a parachute is used to slow the landing unit to a slower speed before going for the landing. The jettisoning of the heatshield is next followed by more drift to the target landing site followed by the near land firing of retro rockets for that finally speed break to a soft touch down.

We have tried the beach ball landing
MarsPathfinder_airbags_275w.jpg


The hazards of landing on Mars

https://mars.jpl.nasa.gov/msl/multimedi … xV2-2.html

ExoMars2016_descent_sequence_600w.jpg

Of course with each level of mass to the surface requires more energy to be used for the landing and in such we used the skycrane for the MSL

MSL_sky_crane_275w.jpg

http://www.planetary.org/blogs/emily-la … art-1.html
http://www.planetary.org/blogs/emily-la … art-2.html

To that end these are the places we have been able to make it to the surface; all of which are very low mars mean landing areas putting the mountainous areas out of reach.

Mars_landing_sites_600p.jpg

So we are now looking at ATMOSPHERIC MODELS FOR MARS AEROCAPTURE

To which we are talking about the density of mars air as we punge through it from orbit and being able to predict how much it will slow the craft.

That is why it is so challenging to get it right.
The Challenge of Mars EDL (Entry, Descent, and Landing)

pg 12 is the parachute and velocity curves for what we can do

pg 18 is a possible look at what can improve the mass getting to the surface

pg 23 is aerocapture

The Problem With Landing Humans on Mars (and How to Fix It)

Oscillation of Supersonic Inflatable Aerodynamic Decelerators at Mars hypercone or inflateable cone


Beyond current EDL Technologies on Mars: Evaluation of ARMADA Concepts A blade rotation to slow the landing..

https://www.researchgate.net/publicatio … Propulsion

Space x was to be leading the way for getting more mass to the surface with the Red Dragon sample return mission but it has been dropped leaving Mars still off limits for the time being.

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#2 2018-07-04 18:49:42

SpaceNut
Administrator
From: New Hampshire
Registered: 2004-07-22
Posts: 21,310

Re: The difficulty of landing for Mars

Finally found the leg images and such to aid in the landing aspect of larger vehicles like the BFR.

BhM-H_4CUAAWcP0.jpg

spaceX-landing-leg.png

9z9jA.jpg

w03Q1.png

But we do know that if all four legs are not evenly loaded that the rocket will tumble to the ground.

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