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Delta IV Heavy Launch  
User currently offlineSATL382G From , joined Dec 1969, posts, RR:
Posted (9 years 4 months 1 day 19 hours ago) and read 2378 times:

1st Delta IV Heavy launch is in about 20 min at 1631EST. Boeing is webcasting.

[Edited 2004-12-21 22:12:15]

Webcast available at this site:
http://www.boeing.com/news/feature/livewebcast/d4_heavy_webcast.htm

[Edited 2004-12-21 22:18:41]

13 replies: All unread, jump to last
 
User currently offlineSATL382G From , joined Dec 1969, posts, RR:
Reply 1, posted (9 years 4 months 1 day 19 hours ago) and read 2334 times:

Holding for range safety problem. Launch window remains open until 1731EST

User currently offlineSATL382G From , joined Dec 1969, posts, RR:
Reply 2, posted (9 years 4 months 1 day 19 hours ago) and read 2329 times:

Count resuming...

filler


User currently offlinePPGMD From United States of America, joined Sep 2001, 2453 posts, RR: 0
Reply 3, posted (9 years 4 months 1 day 19 hours ago) and read 2326 times:

lift off, looks good


At worst, you screw up and die.
User currently offlinePPGMD From United States of America, joined Sep 2001, 2453 posts, RR: 0
Reply 4, posted (9 years 4 months 1 day 19 hours ago) and read 2324 times:

No cloud that I can see here in Sarasota, too bad I look forward to see the cloud for the shuttle launches I can't goto in person.


At worst, you screw up and die.
User currently offlinePPGMD From United States of America, joined Sep 2001, 2453 posts, RR: 0
Reply 5, posted (9 years 4 months 1 day 19 hours ago) and read 2322 times:

Strap on booster separation successful


At worst, you screw up and die.
User currently offlinePPGMD From United States of America, joined Sep 2001, 2453 posts, RR: 0
Reply 6, posted (9 years 4 months 1 day 19 hours ago) and read 2322 times:

Successful stage separation, and deployment. Successful fairing release. Looks to be a complete success to me.


At worst, you screw up and die.
User currently offlineSATL382G From , joined Dec 1969, posts, RR:
Reply 7, posted (9 years 4 months 1 day 18 hours ago) and read 2306 times:

PPGMD - Were you able to see anything from your location?

User currently offlineHaveBlue From United States of America, joined Jan 2004, 2090 posts, RR: 1
Reply 8, posted (9 years 4 months 1 day 18 hours ago) and read 2293 times:

I could see it VERY clearly here from Daytona Beach. I didn't realize the launch was today and the phone rings and my buddy is like "what rocket am I looking at?" and I said "damnit, that's gotta be the Delta IV I've been waiting for!". Scramble outside the door and see the huge white plume of smoke, which ended oddly a little ways up the sky, then it was just clear and you could see the rockets fire clearly up above that. I'm assuming the plume stopped where the seperation occurred, but it looked kinda low.

Still, an impressive sight, wish I had caught the whole thing. Very happy that it was successful, especially after all the delays.



Here Here for Severe Clear!
User currently offlineSATL382G From , joined Dec 1969, posts, RR:
Reply 9, posted (9 years 4 months 1 day 18 hours ago) and read 2292 times:

I didn't realize it was today either 'til I saw it on nasawatch.com about 30 min prior. Webcast coverage was pretty good, caught port & starboard CBC cut off and 1st stage sep....

User currently offlinePPGMD From United States of America, joined Sep 2001, 2453 posts, RR: 0
Reply 10, posted (9 years 4 months 1 day 18 hours ago) and read 2280 times:

I saw it all SATL... via the webcast. Didn't see anything here, we can see the shuttle on clear days.

Which today was a clear day, except for some clouds over Orlando area at 5500. *shrugs* Should have seen it, but didn't.



At worst, you screw up and die.
User currently offlineSATL382G From , joined Dec 1969, posts, RR:
Reply 11, posted (9 years 4 months 1 day 1 hour ago) and read 2032 times:

Looks like the first stage was short of energy. 2nd stage tried to compensate and apparently ran out of propellant.

http://www.spaceflightnow.com/delta/d310/


User currently offlineSATL382G From , joined Dec 1969, posts, RR:
Reply 12, posted (9 years 1 month 5 days 20 hours ago) and read 1701 times:

So much for the "software" problem...

http://www.spaceref.com/news/viewpr.html?pid=1642

"The root cause of the anomaly has been identified as a fluid cavitation within the liquid oxygen feed system. Analyses show that the cavitation originated at the entrance of the propellant feedline, where a filtration screen and turning elbow restrict the propellant flow as it accelerates leaving the tank."


User currently offlineAreopagus From United States of America, joined Sep 2001, 1368 posts, RR: 1
Reply 13, posted (9 years 1 month 4 days 15 hours ago) and read 1673 times:

I saw the article on this at Spaceflight Now, which quoted the Air Force report:

"Analyses show that the cavitation originated at the entrance of the propellant feedline, where a filtration screen and turning elbow restrict the propellant flow as it accelerates leaving the tank. This feedline restriction has been present in all previous Delta 4 flights, but the unique combination of vehicle acceleration, liquid level in the tank, and propellant flow rate for this mission, reduced the fluid pressure enough to enable the creation of gaseous oxygen at this location as the tanks emptied," Wednesday's Air Force statement said.

But I'm left wondering, what's so unique about it? The acceleration at center core burnout must have been higher (well, at least different) than at strap-on burnout, and the problem occurred in both conditions. As far as liquid level in the tank and flow rate, how would this differ from earlier flights?


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