Author Topic: Quick LRV question  (Read 6513 times)

Offline BertieSlack

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Quick LRV question
« on: November 11, 2016, 03:19:44 AM »
IIRC, each wheel was driven by its own electric motor. Did the bearings require any lubrication? Or were they dry-lubricated? Does direct drive even require bearings? A hoaxnut is claiming he can see leaking axle grease in an EVA photo. Help me address his (and my) ignorance. Thanks in advance.
« Last Edit: November 11, 2016, 03:40:49 AM by BertieSlack »

Offline Obviousman

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Re: Quick LRV question
« Reply #1 on: November 11, 2016, 03:59:08 AM »
It seems each drive was sealed. See attachment.


Offline Obviousman

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Re: Quick LRV question
« Reply #2 on: November 11, 2016, 04:02:52 AM »
Also this.

Offline BertieSlack

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Re: Quick LRV question
« Reply #3 on: November 11, 2016, 04:49:42 AM »
It seems each drive was sealed. See attachment.

Thanks for the quick response. I'll get back to hoaxer.

Offline onebigmonkey

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Re: Quick LRV question
« Reply #4 on: November 11, 2016, 03:57:55 PM »
I'm curious as to what is being seen as axle grease!

Offline Obviousman

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Re: Quick LRV question
« Reply #5 on: November 11, 2016, 07:59:58 PM »
Ditto.

Offline BertieSlack

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Re: Quick LRV question
« Reply #6 on: November 12, 2016, 02:15:29 AM »
I'm curious as to what is being seen as axle grease!

The hoaxer didn't give the reference number of the EVA photo. I'll try to find it.

Offline BertieSlack

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Re: Quick LRV question
« Reply #7 on: November 12, 2016, 11:19:31 AM »
I'm curious as to what is being seen as axle grease!

The hoaxer didn't give the reference number of the EVA photo. I'll try to find it.

Found it: https://www.hq.nasa.gov/alsj/a17/AS17-146-22296HR.jpg

Offline Obviousman

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Re: Quick LRV question
« Reply #8 on: November 12, 2016, 04:28:41 PM »
He's not referring to the dust, is he? On the wheel, near the axle, etc?

Offline BertieSlack

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Re: Quick LRV question
« Reply #9 on: November 13, 2016, 01:12:31 AM »
He's not referring to the dust, is he? On the wheel, near the axle, etc?

Yep - he's referring to the dust. Would electrostatics be part of the reason it sticks like that?

Offline Bryanpoprobson

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Re: Quick LRV question
« Reply #10 on: November 13, 2016, 04:06:32 AM »

Yep - he's referring to the dust. Would electrostatics be part of the reason it sticks like that?

Would have been my first thought, the astronauts claimed it clung to everything.
"Wise men speak because they have something to say!" "Fools speak, because they have to say something!" (Plato)

Offline bknight

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Re: Quick LRV question
« Reply #11 on: November 13, 2016, 08:04:19 AM »
He's not referring to the dust, is he? On the wheel, near the axle, etc?

Yep - he's referring to the dust. Would electrostatics be part of the reason it sticks like that?
I'm not sure about electrostatics, but from the post EVA images of the astronauts dust was covering them, A17 complained of regolith getting underneath their fingernails after the EVA's.
Truth needs no defense.  Nobody can take those footsteps I made on the surface of the moon away from me.
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Offline Zakalwe

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Re: Quick LRV question
« Reply #12 on: November 13, 2016, 12:38:39 PM »
The dust is, according to Gene Cernan, one of the biggest challenges to Lunar exploration. The Sun's rays charge it (via UV and soft X-ray photons) it so it not only clings electrostatically, but it also lifts itself up and travels along magnetic fieldlines.

https://en.wikipedia.org/wiki/Lunar_soil#Moon_dust_fountains_and_electrostatic_levitation

www.lpi.usra.edu/meetings/lsc1972/pdf/1011.pdf

http://onlinelibrary.wiley.com/doi/10.1029/2005RG000184/full  (Section 3.1)

As for the hoaxie's belief that the bearing is leaking, he is using his limited knowledge of the world and applying it to a very strange environment. If only he'd dig a bit deeper then he'd open up a world of interesting articles about the strangeness of Lunar regolith. I guess that if he did that though then he wouldn't be a conspiratard.
"The strain of anti-intellectualism has been a constant thread winding its way through our political and cultural life, nurtured by the false notion that democracy means that 'my ignorance is just as good as your knowledge.' " - Isaac Asimov