Nh - The Launch Thread, Godspeed little one |
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Nh - The Launch Thread, Godspeed little one |
 Jan 24 2006, 04:48 AM
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#541
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 Junior Member  Group: Members Posts: 27 Joined: 13-November 05 From: Edmonds, Washington Member No.: 552  |
QUOTE (tty @ Jan 23 2006, 01:04 PM) Very true. If something bad happens during a launch it is very often near "Max Q", i e maximum dynamic pressure.  Yeah, learning about dynamic pressure, what it is and why it is important, was a big part of my growth as a rocket engineer. Growth from drawing rockets in the margins of my notebooks in school (elementary school) to drawing rockets in the margins of my notebooks in school after doing a great deal of math first (graduate school). Its worth pointing out I'm a masters of education program... --Nick |
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Jan 24 2006, 02:36 PM
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#542
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 Member Group: Members Posts: 183 Joined: 22-October 05 From: Cape Canaveral, FL Member No.: 534 |
Just to share, I made Astronomy Picture of the Day today:
http://antwrp.gsfc.nasa.gov/apod/ap060124.html pretty cool! -------------------- |
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Jan 24 2006, 02:52 PM
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#543
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 Senior Member Group: Members Posts: 2454 Joined: 8-July 05 From: NGC 5907 Member No.: 430 |
QUOTE (BPCooper @ Jan 24 2006, 09:36 AM) Just to share, I made Astronomy Picture of the Day today: http://antwrp.gsfc.nasa.gov/apod/ap060124.html pretty cool! Congrats and yes, very cool! How did you do it without your and/or the camera becoming a crispy critter? -------------------- "After having some business dealings with men, I am occasionally chagrined,
and feel as if I had done some wrong, and it is hard to forget the ugly circumstance. I see that such intercourse long continued would make one thoroughly prosaic, hard, and coarse. But the longest intercourse with Nature, though in her rudest moods, does not thus harden and make coarse. A hard, sensible man whom we liken to a rock is indeed much harder than a rock. From hard, coarse, insensible men with whom I have no sympathy, I go to commune with the rocks, whose hearts are comparatively soft." - Henry David Thoreau, November 15, 1853 |
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Jan 24 2006, 03:31 PM
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#544
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 Senior Member Group: Members Posts: 2488 Joined: 17-April 05 From: Glasgow, Scotland, UK Member No.: 239 |
QUOTE (ljk4-1 @ Jan 24 2006, 03:52 PM) Congrats and yes, very cool! How did you do it without your and/or the camera becoming a crispy critter? Ben: Congratulations, too - I presume you used the good ol' sound operated camera setup... Bob Shaw -------------------- Remember: Time Flies like the wind - but Fruit Flies like bananas!
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Jan 24 2006, 04:53 PM
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#545
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 Member Group: Members Posts: 147 Joined: 3-July 04 From: Chicago, IL Member No.: 91 |
Ben,
Congrats! Wow that is one fantastic picture! Great job. |
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Jan 24 2006, 05:18 PM
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#546
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 Senior Member Group: Members Posts: 3648 Joined: 1-October 05 From: Croatia Member No.: 523 |
To answer my own question earlier, those of you who missed the launch webcast, there's a very nice archive on The Spacearium. Among others, it has a clip running from T-4 until T+5, the post-launch press conference as well as a number of launch replays are available.
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Jan 24 2006, 05:40 PM
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#547
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 Special Cookie Group: Members Posts: 2168 Joined: 6-April 05 From: Sintra | Portugal Member No.: 228 |
 HOW ON EARTH DID I MISS THIS?!?  
-------------------- "Ride, boldly ride," The shade replied, "If you seek for Eldorado!"
Edgar Alan Poe |
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Jan 24 2006, 08:13 PM
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#548
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Member Group: Members Posts: 624 Joined: 10-August 05 Member No.: 460 |
QUOTE (Ames @ Jan 23 2006, 05:47 AM) I think the rationale behind this is that early on, what you want to do is to get out of the dense atmosphere (high drag) as quickly as possible and straight up vertically (whilst augmented with the SRB's) is the quickest way. Then when drag becomes less of an issue you want to build speed to reach orbital velocity and horizontal (tangential) is the way to go. Obviously they can't launch straight up because of safety reasons. So you usually see a gradual transition from vertical to horizontal, but NH nodded! it was VERY noticeable and may heart sank for a moment. New Horizon used liquid, rather than solid boosters. The 'nod' may have been when more thrust was added after dynamic pressure concerns were reduced. The Shuttle boosters are solids, so the thrust is controlled by the propellant grain contour: The more grain surface area, the more thrust. There is another subtle difference: Most solid motors burn from the inside out, so there is an inertial column the length of the motor. In a liquid engines, and liquid boosters, the combustion chamber is at the bottom, so it is more like a balanced pencil on the tip of your finger - slightly more prone to wobble than a solid rocket motor. |
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Jan 24 2006, 08:51 PM
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#549
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Founder Group: Chairman Posts: 14432 Joined: 8-February 04 Member No.: 1 |
The Atlas V 551 uses 5 solid rocket motors + the RD180 engine, so considerably more than half the thrust at launch comes from solid motors.
Doug |
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Jan 24 2006, 09:16 PM
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#550
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Member Group: Members Posts: 183 Joined: 22-October 05 From: Cape Canaveral, FL Member No.: 534 |
Thanks, yep the remote sound activated camera. I escaped this time. If you want to read more on how we get those kinds of shots, I wrote up an article yesterday:
http://www.popphoto.com/idealbb/view.asp?t...=45561&pageNo=1 -------------------- |
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Jan 25 2006, 05:41 AM
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#551
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Member Group: Members Posts: 624 Joined: 10-August 05 Member No.: 460 |
QUOTE (djellison @ Jan 24 2006, 01:51 PM) The Atlas V 551 uses 5 solid rocket motors + the RD180 engine, so considerably more than half the thrust at launch comes from solid motors. Doug Thanks Doug, that is correct, it is the core of the 'zero' stage that is liquid, the five strap-ons are solid. Minor aside here: As NASA scrambled for a replacement for the shuttle, they ask both Boeing and Lockheed to prepare a list of viable options. Boeing retorted that only their stack would work, Lockheed said only theirs would, so NASA decided to do their own study and concluded that since both stacks involved a cadra of solids, providing most of the thrust, why not just elliminate the liquid core and go with a solid first stage? |
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Jan 25 2006, 06:43 AM
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#552
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 Senior Member Group: Members Posts: 2492 Joined: 15-January 05 From: center Italy Member No.: 150 |
QUOTE (BPCooper @ Jan 24 2006, 02:36 PM) Just to share, I made Astronomy Picture of the Day today: http://antwrp.gsfc.nasa.gov/apod/ap060124.html pretty cool! I join to the congrats chorus..! I always asked myself how similar pictures were taken... there are many other examples, taken from even closer distances (eg the popular shuttle view from below, shortly after launch)... I understand they are remotely taken, but how cameras are protected from extremely high temperature/pressure from engines? Thanks. -------------------- I always think before posting! - Marco -
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Jan 25 2006, 08:56 AM
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#553
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Senior Member Group: Moderator Posts: 4279 Joined: 19-April 05 From: .br at .es Member No.: 253 |
QUOTE (dilo @ Jan 25 2006, 07:43 AM) I always asked myself how similar pictures were taken... there are many other examples, taken from even closer distances (eg the popular shuttle view from below, shortly after launch)... I understand they are remotely taken, but how cameras are protected from extremely high temperature/pressure from engines? Thanks. IIRC, some of them (e.g. AT the shuttle launch pad) are encased on boxes which automatically close a protecting cover seconds after T0 in a process similar to the shuttle T0 umbilicals. On the other side, I remember a sequence on the ISS IMAX movie in which a camera lens (or its protecting cover) was literally broken during the Proton launch due to debris. |
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Jan 25 2006, 01:01 PM
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#554
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Member Group: Members Posts: 183 Joined: 22-October 05 From: Cape Canaveral, FL Member No.: 534 |
QUOTE (Tesheiner @ Jan 25 2006, 04:56 AM) IIRC, some of them (e.g. AT the shuttle launch pad) are encased on boxes which automatically close a protecting cover seconds after T0 in a process similar to the shuttle T0 umbilicals. On the other side, I remember a sequence on the ISS IMAX movie in which a camera lens (or its protecting cover) was literally broken during the Proton launch due to debris. Yes, that's correct. Many of us use boxes but not all. But for the cameras mounted on the Shuttle launch tower that get those shots, they are definitely housed inside heat and flame proof boxes that flip open for the shot and close afterwards. -------------------- |
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Jan 25 2006, 10:12 PM
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#555
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Senior Member Group: Members Posts: 2492 Joined: 15-January 05 From: center Italy Member No.: 150 |
Thanks Tesheiner/BPCooper, I suspected this answer but is great to know from experts!
Where is possible to see broken IMAX camera movie? -------------------- I always think before posting! - Marco -
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