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#76 2019-07-20 19:01:03

louis
Member
From: UK
Registered: 2008-03-24
Posts: 5,186

Re: Space X - another successful mission...

Latest update from Cloudlicker - very interesting...

Looks like we are close to the Starhopper hover test. smile


Let's Go to Mars...Google on: Fast Track to Mars blogspot.com

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#77 2019-07-21 08:53:03

GW Johnson
Member
From: McGregor, Texas USA
Registered: 2011-12-04
Posts: 3,729
Website

Re: Space X - another successful mission...

Spacex's own website now has an update on the crew Dragon explosion.  It pretty well matches the other recent news stories. 

Looks like a titanium check valve on the Super Draco portion of the system (separate from the Draco attitude thrusters) between the helium pressurant and the NTO oxidizer leaked NTO into the helium side.  Upon sudden pressurization,  conditions were energetic enough to cause ignition between the titantium and the NTO,  bursting the valve and causing the explosion. 

The check valve is being replaced with a burst disc,  which cannot leak until pressurized to burst. 

Be aware that a burst disc is a one-shot device.  This means the Super Draco thrusters can only be ignited once.  In turn that means the Super Dracos can never be used for a powered landing that requires more than one burn.  No one is talking about that.

GW


GW Johnson
McGregor,  Texas

"There is nothing as expensive as a dead crew,  especially one dead from a bad management decision"

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#78 2019-07-21 09:14:30

SpaceNut
Administrator
From: New Hampshire
Registered: 2004-07-22
Posts: 16,833

Re: Space X - another successful mission...

Well that is bad as that puts retro propulsion use out of the question....
Time for a redesign....

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#79 2019-07-25 19:35:12

SpaceNut
Administrator
From: New Hampshire
Registered: 2004-07-22
Posts: 16,833

Re: Space X - another successful mission...

SpaceX’s latest resupply launch to the ISS was a success against the odds

The rocket conveyed SpaceX’s Dragon capsule, decorated with an “Apollo 50th” badge. The capsule contained 5,500 pounds worth of equipment for experiments and ongoing scientific research. The Falcon 9 booster got the Dragon into orbit before making it back down to the Earth and landing exactly where it was supposed to about eight minutes after the launch. This is one of the last cargo resupply missions SpaceX launched under its current initial resupply contract with NASA. The contract covered 20 cargo resupply missions to the ISS, of which this was the 18th. The last two under contract will also fly Dragon capsules.

spacex-falcon-9-success-launch-768x768.jpg

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#80 2019-08-01 14:08:34

louis
Member
From: UK
Registered: 2008-03-24
Posts: 5,186

Re: Space X - another successful mission...

Brilliant four way split showing First Stage Falcon 9 landing. Very impressive!


https://www.youtube.com/watch?v=xJSywgvUh6E


Let's Go to Mars...Google on: Fast Track to Mars blogspot.com

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