Question on Lunar Lift Off

raven
Jupiter

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Posts: 509

Question on Lunar Lift Off May 26, 2009 17:50:51 GMT -4

Post by raven on May 26, 2009 17:50:51 GMT -4

Quick question.
Did the the astronauts wear the fishbowl pressurized helmets during the lift off of the ascent stage from the lunar surface back to the CSM?
I was sure they did, but puttering around Google has revealed no evidence for or against.

Last Edit: May 26, 2009 17:51:09 GMT -4 by raven

Conspiracy Theorist Mindset: "It's Turtles All The Way Down. Government Turtles. "

laurel

Posts: 1,368

Question on Lunar Lift Off May 26, 2009 18:54:32 GMT -4

Post by laurel on May 26, 2009 18:54:32 GMT -4

They did wear them. "Don helmets and gloves" was on their checklist, it was a few items before "engine start."

history.nasa.gov/alsj/a11/surface11.html

Also in the Apollo 14 ALSJ, Eric Jones asks Ed Mitchell if the LM ascent engine was noisy and Mitchell says, "No, the helmet blocks it out, we weren't paying that much attention to the noise in there."

history.nasa.gov/alsj/a14/a14.launch.html

"My feet they finally took root in the Earth, but I got me a nice little place in the stars, and I swear I found the key to the universe in the engine of an old parked car..."

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raven Jupiter That ain't Earth, kiddies. Posts: 509	Question on Lunar Lift Off May 26, 2009 19:35:21 GMT -4 Select Post Deselect Post Link to Post Member Give Gift Back to Top Post by raven on May 26, 2009 19:35:21 GMT -4 Thank you so much. Once again the good people of the internet help a fellow being in need. Thanks laurel!
	Conspiracy Theorist Mindset: "It's Turtles All The Way Down. Government Turtles. "

laurel Posts: 1,368	Question on Lunar Lift Off May 26, 2009 20:17:33 GMT -4 Select Post Deselect Post Link to Post Member Give Gift Back to Top Post by laurel on May 26, 2009 20:17:33 GMT -4 You should thank the ALSJ people, not me.
	"My feet they finally took root in the Earth, but I got me a nice little place in the stars, and I swear I found the key to the universe in the engine of an old parked car..." Bruce Springsteen

Count Zero

Pad 39A July 14,1969

Posts: 1,183

Question on Lunar Lift Off May 27, 2009 20:27:04 GMT -4

Post by Count Zero on May 27, 2009 20:27:04 GMT -4

May 26, 2009 18:54:32 GMT -4 laurel said:

Also in the Apollo 14 ALSJ, Eric Jones asks Ed Mitchell if the LM ascent engine was noisy and Mitchell says, "No, the helmet blocks it out, we weren't paying that much attention to the noise in there."

history.nasa.gov/alsj/a14/a14.launch.html

How much would the thin air (5psi oxygen) attenuate sound?

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vq
Earth

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Posts: 129

Question on Lunar Lift Off May 28, 2009 15:22:25 GMT -4

Post by vq on May 28, 2009 15:22:25 GMT -4

May 27, 2009 20:27:04 GMT -4 Count Zero said:

May 26, 2009 18:54:32 GMT -4 laurel said:

Also in the Apollo 14 ALSJ, Eric Jones asks Ed Mitchell if the LM ascent engine was noisy and Mitchell says, "No, the helmet blocks it out, we weren't paying that much attention to the noise in there."

history.nasa.gov/alsj/a14/a14.launch.html

How much would the thin air (5psi oxygen) attenuate sound?

I doubt very much; they didn't seem to have any trouble talking to each other when their helmets were off. IIRC, air pressure changes the speed of sound, but doesn't attenuate it significantly.

drewid
Jupiter

Posts: 504

Question on Lunar Lift Off Jun 4, 2009 16:10:35 GMT -4

Post by drewid on Jun 4, 2009 16:10:35 GMT -4

Our ears are incredibly sensitive instruments. The quietest sound you can hear is the equivalent of being able to see 60 watt bulb 3000 miles away.

We have muscles around the bones of the inner ear which clamp down in loud environments to prevent hearing damage. They also stop us going deaf when we eat celery.