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Author
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Topic: [Discuss] SpaceX Dragon Crew-2 mission
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328KF Member Posts: 1340 From: Registered: Apr 2008
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posted 11-09-2021 10:08 AM
quote: Originally posted by Robert Pearlman: ...they had seen this type of delayed unfurling of one parachute during earlier tests
Oh, we’ve seen this before, and it’s normal. We’ve always gotten away with it. Great answer. Sounds a lot like the “in family” characterization given to ET foam shedding before and during STS-107.So what if two chutes fail to inflate properly? |
Robert Pearlman Editor Posts: 47348 From: Houston, TX Registered: Nov 1999
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posted 11-09-2021 10:24 AM
Without more information from NASA or SpaceX, it seems premature to assume this is a safety issue being ignored. As mentioned, we should learn more later today. In the meantime, here is what Lueders said about last night's landing: It is behavior we've seen multiple times in other tests, and it usually happens when the lines kind of bunch up together until the aero forces kind of open up and spread the chutes. The thing that makes me feel a little bit more confident is that the loading and the deceleration of the spacecraft all looked nominal. If I recall correctly, SpaceX has said Dragon can land safely on just three main parachutes. I do not know (and cannot immediately find info) about a two parachute landing. |
ManInSpace Member Posts: 252 From: Brooklin, Ontario Canada Registered: Feb 2018
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posted 11-09-2021 03:54 PM
You are correct, Robert. One of the airdrops used to verify the parachute systems' reliability; was a test to prove that a safe landing could be achieved with only three chutes and that capability was verified. |
Robert Pearlman Editor Posts: 47348 From: Houston, TX Registered: Nov 1999
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posted 11-09-2021 11:00 PM
Tonight, after completing the Crew-3 flight readiness review, Bill Gerstenmaier, SpaceX's vice president for build and flight reliability, said: We did have the one parachute that was a little slow to deploy and we looked at that in detail and video. Also, we looked at in detail the acceleration data from the vehicle. It performed essentially the way it was designed to perform, we can land with three parachutes if we have to.This is potentially a known condition that can occur with the four parachutes. One of the four parachutes can be a little slow to deploy. This one was a little bit slow, it deployed about 75 seconds late. But again, all within the design criteria. We were actually able to get the parachute out of the water, actually have it on a helicopter, fly it back to the Cape, actually hang it off of a crane in a building at the Cape and actually go ahead and inspect it with a NASA team and the SpaceX team to make sure that there was nothing in that parachute that we didn't understand. So, you know each one of these flights is really a gift for us. We're still learning how to operate these vehicles, learning how to fly in space. And the way you do that safely is you keep looking at the data and you learn from each and every flight. So we looked at this, we don't see anything that's off nominal that concerns us from a parachute standpoint. We also talked to the parachute vendor to make sure that they were comfortable with where we're going. We pulled up build records from the the assembly of these parachutes that went into Crew-2. We're pulling up both build records for Crew-3 to make sure there's nothing there but again, we've done an extremely thorough review, everything looks like we're in a good place to go fly tomorrow. | |
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Ultimate Bulletin Board 5.47a
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