Author Topic: Wayne Hale sets up his own blog site  (Read 234095 times)

Offline psloss

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Offline Lee Jay

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Re: Wayne Hale sets up his own blog site
« Reply #121 on: 01/31/2011 04:06 PM »
New post:
http://waynehale.wordpress.com/2011/01/30/memory-fault/


I wonder if someone on NSF could help out Wayne's memory of this event.

Offline Comga

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Re: Wayne Hale sets up his own blog site
« Reply #122 on: 01/31/2011 04:22 PM »
Required reading.

"X-33/Venture Star was a good plan, it could have worked."

My favorite deceased SSTO there.

Let's not derail this by focusing on the one line about X-33.  It is the least favorite rocket for some of us.  I disagree with Mr. Hale's statement above, although I wholeheartedly agree with everthing else in the post.  It is possible we all agree on his main point.
What kind of wastrels would dump a perfectly good booster in the ocean after just one use?

Offline psloss

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Re: Wayne Hale sets up his own blog site
« Reply #123 on: 01/31/2011 04:40 PM »
New post:
http://waynehale.wordpress.com/2011/01/30/memory-fault/


I wonder if someone on NSF could help out Wayne's memory of this event.
I think Wayne concluded this didn't happen as remembered.

Offline Lee Jay

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Re: Wayne Hale sets up his own blog site
« Reply #124 on: 01/31/2011 04:50 PM »
New post:
http://waynehale.wordpress.com/2011/01/30/memory-fault/


I wonder if someone on NSF could help out Wayne's memory of this event.
I think Wayne concluded this didn't happen as remembered.


I know, but I'm wondering if someone remembers a sim or document or something that led his memory to store this as a real event.

Offline Robotbeat

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Re: Wayne Hale sets up his own blog site
« Reply #125 on: 02/02/2011 09:19 PM »
New post:
http://waynehale.wordpress.com/2011/01/30/memory-fault/


I wonder if someone on NSF could help out Wayne's memory of this event.
I think Wayne concluded this didn't happen as remembered.

It actually did happen, though it was a different valve.
This is what Steve T. said in the comments:
http://waynehale.wordpress.com/2011/01/30/memory-fault/
Quote from: SteveT
There was a mis-configured valve in one of the experiments in the lab, designed to allow the experiment to vent to vacuum on orbit. It’s this valve you’re thinking of earlier. The question started out asking if anyone had heard of something like this happening and morphed into a discussion of the cabin depress valve, as communications without a lot of details will sometimes do. At one point your name is mentioned, but the conclusion never got back around to you.

And:
Quote from: SteveT
It was during the turnaround between the first and second launch attempts of STS-55 (there were three attempts; the third was successful). The experiment valve in question was leak checked and failed. They discovered the valve was not in the fully closed position and a redundant sealing cap was not installed correctly. The misconfig likely happened during CEIT. Due to the dilligence you described, the situation was found and corrected. Over the years, it became a story about the depress valve you alluded to in your blog. Typically, the folks who were discussing this are not involved a lot in nitty-gritty pre-launch work, so that’s likely why it got turned into a depress valve story (so probably a lesson more in communicating to upper management properly!). This does not as far as I know involve any data collected from the case studies.
Chris  Whoever loves correction loves knowledge, but he who hates reproof is stupid.

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Offline psloss

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Re: Wayne Hale sets up his own blog site
« Reply #126 on: 02/02/2011 09:31 PM »
New post:
http://waynehale.wordpress.com/2011/01/30/memory-fault/


I wonder if someone on NSF could help out Wayne's memory of this event.
I think Wayne concluded this didn't happen as remembered.

It actually did happen, though it was a different valve.
This is what Steve T. said in the comments:
Seems like a pretty big difference.  Different valve, presumably different hypothetical mission impact...one relationship would be how, as noted in the response on the blog, "Over the years, it became a story about the depress valve you alluded to in your blog."

Offline Chris Bergin

Re: Wayne Hale sets up his own blog site
« Reply #127 on: 03/11/2011 01:22 PM »
Really enjoyed Mr Hale's latest!

http://waynehale.wordpress.com/2011/03/11/breaking-through/

Now searching to see what we have on STS-53 :)

Offline mike robel

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Re: Wayne Hale sets up his own blog site
« Reply #128 on: 03/11/2011 01:33 PM »
I remember my father working (perhaps leading, we didn't talk much about it) elements of the autoland system.  he was always irritated that it was not used.  He mostly dealt with the antennaes for the sytem, as I recall.

Offline nooneofconsequence

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Re: Wayne Hale sets up his own blog site
« Reply #129 on: 03/11/2011 09:06 PM »
I remember my father working (perhaps leading, we didn't talk much about it) elements of the autoland system.  he was always irritated that it was not used.  He mostly dealt with the antennaes for the sytem, as I recall.

The software for MLS / autoland involved comparing the KF position centroid against a modelled trajectory with appropriate control feedback.
"Wise men talk because they have something to say; fools, because they have to say something" - Plato

Offline Wayne Hale

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Re: Wayne Hale sets up his own blog site
« Reply #130 on: 03/12/2011 04:01 PM »
The really scary thing is that I understood that last post. 

The biggest challenge seemed to be multipathing of the antenna signal which would lead to navigation errors.  At KSC we put up microwave "fences" to minimize the possibility of multipath signals.

I think you might soon be able to buy one of those MSBLS units at the government surplus sale; everybody uses GPS these days and there is probably no use for them after the shuttle retires.

Offline Lars_J

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Re: Wayne Hale sets up his own blog site
« Reply #131 on: 03/12/2011 10:37 PM »
So was the autoland system actually used on a later flight?
« Last Edit: 03/12/2011 10:38 PM by Lars_J »

Offline Danny Dot

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Re: Wayne Hale sets up his own blog site
« Reply #132 on: 03/13/2011 01:26 AM »
So was the autoland system actually used on a later flight?

We came very close to testing auto land several yeas ago but changed 'our' mind a few weeks (days?) Before launch.  I personally think auto would work great.
Danny Deger

Offline vt_hokie

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Re: Wayne Hale sets up his own blog site
« Reply #133 on: 03/13/2011 02:11 AM »
Didn't a late transition to manual control during the only White Sands landing have something to do with the late gear deployment? 
« Last Edit: 03/13/2011 02:11 AM by vt_hokie »

Offline psloss

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Re: Wayne Hale sets up his own blog site
« Reply #134 on: 03/13/2011 03:04 AM »
Really enjoyed Mr Hale's latest!

http://waynehale.wordpress.com/2011/03/11/breaking-through/

Now searching to see what we have on STS-53 :)
Wayne's responses in the comments are great, too -- I particularly like the note about what John Shannon said.

Offline edkyle99

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Re: Wayne Hale sets up his own blog site
« Reply #135 on: 03/13/2011 02:51 PM »
Mr. Hale's latest is thought provoking, to say the least. 
http://waynehale.wordpress.com/2011/03/12/a-not-so-simple-truth/

Columbia, it turns out, wasn't "Crater's" fault. 

"A more important lesson is that experts, even in their field of expertise, can be wrong."

 - Ed Kyle 

Offline Chris Bergin

Re: Wayne Hale sets up his own blog site
« Reply #136 on: 03/13/2011 09:09 PM »
Some interlinking :)

Philip's interview with Mr Hale:
http://forum.nasaspaceflight.com/index.php?topic=24466.0 <--thread linking to the article and the book thread.

Offline Aobrien

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Re: Wayne Hale sets up his own blog site
« Reply #137 on: 03/13/2011 09:32 PM »
Some interlinking :)

Philip's interview with Mr Hale:
http://forum.nasaspaceflight.com/index.php?topic=24466.0 <--thread linking to the article and the book thread.
Chris, this is what you need a "like" button for!
Great stuff!
NSF L2=The Ultimate Space Passport

Offline Jester

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Re: Wayne Hale sets up his own blog site
« Reply #138 on: 03/14/2011 07:12 AM »
In reply to Mr. Hale's STS-53 blog entry and comment:
http://waynehale.wordpress.com/2011/03/11/breaking-through/#comment-862

waynehale says:
March 11, 2011 at 8:55 pm

Well, 10 seconds is my rough guess without going back to my files. It seemed like forever. John Shannon was my GNC and I remember him saying out loud: “where is he going?” But the orbiter was coming back with an empty payload bay so it could take more stress.


Below is an excerpt of the STS-53 GNC PFR - Title: Low Energy HAC
(Full report available on L2)
« Last Edit: 03/14/2011 09:54 AM by Jester »

Offline CitabriaFlyer

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Re: Wayne Hale sets up his own blog site
« Reply #139 on: 03/14/2011 08:09 AM »
Really enjoyed the post re STS-53.  Mike Mullane had some good flying stories re Dave Walker in his book Riding Rockets.  Wish I could grab some backseat time in a T-38 with Captain Walker...  I think.

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