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The Spaceflight Thread
« Reply #210 on: December 15, 2019, 08:55:08 PM »

The Spaceflight Thread
« Reply #211 on: December 15, 2019, 09:04:52 PM »
Today I learned that there is a falcon feather on the moon.
https://www.atlasobscura.com/articles/objects-of-intrigue-the-falcon-feather-on-the-moon.amp



I suppose due to the nature of this site, I was expecting to find that there was a feather in one of the early photographs- and that it would prove that we have not been to the moon yet.

Interesting to find that there was validation. I had always thought it was still a theory...

The Spaceflight Thread
« Reply #212 on: December 15, 2019, 10:21:07 PM »
Today I learned that there is a falcon feather on the moon.
https://www.atlasobscura.com/articles/objects-of-intrigue-the-falcon-feather-on-the-moon.amp



It’s because they replicated Galileo’s famous experiment with a cannonball and a feather to prove the constancy of the rate of gravity. They both fell at the same rate.

The Spaceflight Thread
« Reply #213 on: December 17, 2019, 06:14:44 PM »
It’s because they replicated Galileo’s famous experiment with a cannonball and a feather to prove the constancy of the rate of gravity. They both fell at the same rate.

Apollo 15

https://youtu.be/joiDCk_3t20

peace
Hog

The Spaceflight Thread
« Reply #214 on: December 17, 2019, 06:38:39 PM »
Friday morning 6:30 est an Atlas-5 core with 2 solid boosters and a 2 engine Centaur Upper Stage will launch the Boeing CST-100 Starliner into a trajectory to dock with the ISS a few days later.  This is a test of the human rated Starliner capsule system.  It provides safe launch and entry along with a 6 month long on station emergency escape vehicle.  If ever the ISS requires an immediate evacuation. Astro/Cosmonauts would race to their Soyuz right now, but once the 2 Commercial Crew systems are up and running we no longer pay the Russians US$82 million per seat to and from ISS.  Shuttle last landed July 2011. Since then the USA has relied on Russian rides to its own space station.  Starliner flies uncrewed during its first Orbital Test Flight(OTF-1) this Friday, then if successful flies again but this time with a crew of 3.  Space-X the other Commercial Crew provider will fly its first test crew on Demonstration Mission-2 this Feb.  We "should" have both operators up and running operationally for 2021.



There are a couple opportunities to see this vehicle and the ISS in the next week.  Check the Heavens Above site for your exact view times.
https://heavens-above.com/main.aspx

peace
Hog

The Spaceflight Thread
« Reply #215 on: December 20, 2019, 08:04:56 AM »
The launch which took place almost exactly 1 hour 25 minutes ago saw the first stage of the Atlas 5 and the upper stage of the dual Centaur successfully deliver the CST-100 capsule into just shy of orbit.  The capsules thrusters were supposed to place the capsule into orbit, but they didnt.  It is temporarily in a stable orbit, but there are serious consequences for this.  It was due to meet up with the ISS Saturday morning approx 24 hous after launch.

Space is HARD!

Press conference on NASA TV at 9:30 EST.  https://www.nasa.gov/nasalive



peace
Hog

The Spaceflight Thread
« Reply #216 on: December 20, 2019, 02:10:38 PM »
Well we are just passed the MET(Mission Elapsed Time) of 8-1/2 hours since this mornings 6:36 est launch.

Some excellent photography from the launch.





It is looking like they are going to bring the capsule down on Sunday at the at the White Sands Missile Range. the have 5 landing sites in the Western United States.  This minimizes exposing anything in the flight path from being affected in case something goes wrong.

 The last time a crew-rated space vehicle landed there was the space shuttle that concluded STS-3, the 3rd in the series of 4 test flights.  During the Approach and Landing Test(ALT) a Shuttle Carrier Aircraft(SCA) carried Enterprise(the non space capable orbiter went into a dive turned to the left while just as Enterprise was released above it.  It glided to a runway and landed.

When the SCA 747 is loaded with an Orbiter Vehicle its range was reduced from 4600-5600 nautical miles down to 1000 nautical miles/1150 mile. 

peace
Hog

The Spaceflight Thread
« Reply #217 on: January 01, 2020, 02:39:28 AM »

The Spaceflight Thread
« Reply #218 on: January 08, 2020, 03:45:32 PM »
Here the first Core Stage of SLS was lfted out of the Michoud Assembly Facility in La.  It will be loaded upon the Pegasus barge for the ride to Stennis Space Center in La.  There all 4 RS-25 engines will be fired up at the same time and tested on the B-2 test stand.  The same test stand that tested the S1C first stage of the massive Saturn V moon rocket.



peace
Hog

The Spaceflight Thread
« Reply #219 on: January 08, 2020, 08:08:03 PM »
And onto the Pegasus barge.



peace
Hog

The Spaceflight Thread
« Reply #220 on: January 10, 2020, 12:45:43 PM »
A nice collage of all the Space Launch System hardware that has been manufactured thus far for the first uncrewed Artemis-1 mission to the Moon.
.


And a video of Space Launch System Core Stage-1 rolling out from the Michoud Assembly Facility to the Pegasus barge for transport to Stennis SPace Center where these 4 hydrolox (liquid hydrogen/oxygen) RS-25 engines, all of which have already flown on multiple space shuttle missions.

https://youtu.be/5G9h5MQ9lAU



these are the largest Liquid oxygen and liquid hydrogen tanks ever constructed.  The core stage is 212 feet long and has an empty mass of 85,270 kg (187,990 lb) and when filled with propellant it weighs 979,452 kg (2,159,322 lb).
Compared to the Space Shuttle External Tank(the big brownish tank) which was 158 feet tall and weighed 58,500 pounds when empty and weighed 1,680,000 lb (760,000 kg) when filled with propellant for launch



Towards the end of the year(Dec 5/2019), NASA also did some destructive testing on a Core Stage Structural Test Article.  Apparently the Core Stage failed when 260% of the predicted maximum flight loading, which was within a few percent of the predicted failure point.

This video shows the Structural Test Article and its final test as the test rig exerts millions of pounds of pressure onto the Core Stage.  The video is incorrectly titled, its not just a hydrogen tank test, both the hydrogen AND oxygen tank compose the Core Stage
https://youtu.be/-W5EXElmqC4

High res image post test(obviously)



peace
Hog

The Spaceflight Thread
« Reply #221 on: January 16, 2020, 12:36:10 PM »
17 years ago today STS-107 Columbia launched on her 39º orbital inclination.  A piece of foam liberated from the External Tank and hit the wing leading edge with a closing speed of  approx. 525mph.  Imagery showed a "poof" as the wing hit the foam.  Everyone imagined throwing a Styrofoam cooler out of a car and having it disintegrate on the car behind it. The Reinforced Carbon-Carbon(RCC) that withstood the hottest of entry temps was thought to be VERY resistant to actual physical contacts, when in fact it was a far physically weaker material.

Later testing with actual flight RCC and foam targets fired at the specified velocities actually punched a hole through the "supposedly armour like" RCC panels.  RCC is a highly specialized component costing many millions of dollars.  It's only used on the leading edges of the wings and on the nose cap of the orbiter vehicle.

The vehicle/crew was doomed the moment this damage occurred.  It's easy to look back with the aid of hindsight, but damn an Atlantis Columbia  rescue mission would have made the Apollo 13 rescue look like childs play.  It would have been a gleaming  success for NASA and the United States as a whole.  Someone was too worried about "the next mission" rather than concentrating the one that has possibly been damaged that's on orbit at THIS moment.  There were people attempting to use classified imagery assets to attempt an imagery opportunity of Columbia's wing, but as soon as Linda Hamm(STS-107 Mission Management Team MMT-Head) heard of this, she put an end to all further requests for outside agency help for imagery of Columbia whilst on orbit. Columbia fired her Orbital Maneuvering Engines to come home on Feb 1, 2003 and during entry heating, 3000º+ gasses entered the inside of Columbias wing and began to consume from within. Control was lost and vehicle breakup occurred shortly after.  Blunt force trauma was the primary cause of death.

This video shows the incident AND the subsequent testing.
https://www.youtube.com/watch?v=IgQ3ekcvyRA

Notice that the ISS orbits on a different orbit at 51.6º while Columbia was at 39º .  Using the ISS as a "lifeboat" was impossible.

I was living in downtown Toronto going to school at the time.  I remember seeing the bright streaks across the TV screen.

Condolences to the USA, India and Israel. 
Rear (L-R): David Brown, Laurel Clark, Michael Anderson, Ilan Ramon(Israel);
Front (L-R): Rick Husband(Commander), Kalpana Chawla(USA/india), William McCool(Pilot)

Per aspera ad astra
Hog