Moon Walkers.

[MileHigh]

Your thought experiment has nothing to do with your over stated weight of the astronaut and suit on the moon.

One last time, I am fully aware that the gravity is weaker and the astronaut weighs less on the moon.  The issue is that when his feet land on the surface of the moon and make an impact resulting in a certain amount of energy that is transmitted into the lunar soil, it's his mass and his velocity that count, not his weight and velocity.

If you can't understand that, then it's hopeless.

PW stated what sublimation is and in your explanation with the "ice crystals" you seemingly ignored what he said or it all just passed right though you like you weren't even there.

[scratchrobot]

....

[picowatt]

I was doing some work on my bench when I realized I had a bag of small white nylon spacers laying next to me that I had purchased at the local hardware store for a recent build.

I also have a temp controlled heat gun, so just for grins I mounted the .375"OD X .170"ID X .125" thick bushing in a self closing tweezer, set the heat gun to 400F and heated the bushing for some time.  During and after heating no deformation was noted and squeezing along the diameter of the hot bushing with a needle nose pliers indicated that the bushing was only slightly soft but it immediately sprung back to being round as soon as I released the pressure.

To verify the temp, I then mounted a thermocouple between the bushing and tips of tweezer and again heated the bushing.  I took the bushing/thermocouple to 208C/407F and again tried squeezing the bushing with the pliers.  As before, it only appeared a bit soft and sprung back into shape as soon as the pressure was released.

I have no idea what type of nylon this bushing is made from, but it took the heat very well.

Back to work...

PW

[tinman]

If you can't understand that, then it's hopeless.

PW stated what sublimation is and in your explanation with the "ice crystals" you seemingly ignored what he said or it all just passed right though you like you weren't even there.

One last time, I am fully aware that the gravity is weaker and the astronaut weighs less on the moon.  The issue is that when his feet land on the surface of the moon and make an impact resulting in a certain amount of energy that is transmitted into the lunar soil, it's his mass and his velocity that count, not his weight and velocity.

One last time MH,if you are well  aware that his weight is less than what you stated(by over 600%),then you should also be aware that that same mass is going to have an impact that is 600% less than what you tried to present. The fact is(and you can argue all you like)that a mass that weighs 21.45kg's on the moon,is going to dissipate 600% less impact energy than a mass that weighs 130 kg's on the moon,when hitting the moon surface from the same height. As we were discussing the wavering flag on the !!moon!!,then it is clear that when you quoted your weights(more than once),you were clearly trying to increase your chances at making your ridiculous claim believable by others reading this thread. Do what you tell everyone else here to do when presenting an argument of support,or data to present your theory.

Now--you have made a claim. You now have to do what you insist we all do--carry out an experiment that supports your claim. When you have done this,i will carry out an experiment that supports my claim. When we are done,we can see who's theory is correct-->are you up for the challenge MH ? I will even allow you to use your weight of 130kg's to get your flag to wave. All you have to do is place a clear panel between the flag and the weight being dropped at around 2 feet away from the flag--it is that simple--an old glass sliding door as the divider would do just fine. You may choose any surface soil you like-soft,hard,it dose not matter.

I will then carry out my experiment,and see how my theory pans out-->are you up to the challenge MH ?. Im happy if you can not do the experiment,to get some one else to carry it out for you.
What do you say MH--shall we see if your earth quake man theory is correct?.


Brad.

P.S
Then we can try and explain as to why the hammer and feather in the hammer and feather test,fall much slower than that item did that fell out of the astronaut's PLSS unit.

Then after we have solved that,we can then move on to as why the lunar rovers(and every other motion) seem to be in slow motion,when our wonderful laws of physics say that this is impossible when the force of gravity is much less,and the fact that there is also no atmospheric resistance.

[tinman]

Tinman.

The ejected stream is not ice particles.  The water ice sublimes into a gas.  Think a flow of water molecules.

The info I provided was from recollection with discussions I had with an engineer that worked at Huntsville during Apollo.  I was curious as to how heat was dealt with in a vacuum and we spent a great deal of time looking at a photo album and discussing Apollo.  Those conversations were some 45 years ago or so.  I recall there being an opening on the left side of the hard shell for the exhaust, but at my age, it would not be the first time my recollection was in error.  I also recall the O2 bottles being at the very top of the unit.

That said, I admit to being totally unfamiliar with the outer soft shell.  Even so, I find it very hard to believe the area you point out is the exhaust for the sublimator.  That looks too small and more so like the end of a strap.

The fan in the sublimator unit acts more like a turbomolecular pump than like a fan here on Earth.  Molecules are accelerated by impact with the rotating and angled blades.

As time allows, I will try to find out more about the PLSS, particularly with regard to the soft shell lay out.

Do you have a link that indicates the area you outlined is the vent?

PW

I have found many detailed drawings of the PLSS unit,but not one indicates as to where the exaust vent is. The only way i could then use to work out where the vent was,was to look at several HD expanded picture,and try and find the vent visually. The one i have circled is the only outlet i could find,and all the pictures show the left side of the PLSS unit to be totally covered in the outer soft layer and additional carry pack. There is also the fact that the flags first motion is toward the astronaut. If ejected gas was hitting the flag,causing it to move,then it's first motion should be away from the astronaut.


Brad.