Re: Falcon 9 video - moving early?
SpaceX starts all nine engines and makes sure they are operating to spec before releasing the rocket from the pad. The shuttle does the same thing with the three shuttle engines before they light the solids.
73, Drew KO4MA
-----Original Message-----
From: "vk1pe.peter" [email protected] Sent: Jun 5, 2010 4:59 PM To: [email protected] Subject: [amsat-bb] Falcon 9 video - moving early?
I think that my eyes are not deceiving me.
See http://www.youtube.com/watch?v=sP5gykvTBpM or http://bit.ly/dx9Vot. Falcon 9 appears to move at about T -3s. The count is still running towards zero in the video, and the "call" seems to be between 4 and 3. What do others think?
Also, were the umbilicals meant to "tear away" (as it moved) or "drop away" (before it moved)?
Peter VK1PE _______________________________________________ Sent via [email protected]. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
yES BUT IN THAT VIDEO BELOW IT IS CLEASRLY OFF THE PAD AND MOVING UP AT T-3 SECONDS.
The Original Rolling Ball Clock Idle Tyme Idle-Tyme.com http://www.idle-tyme.com
On 6/5/2010 5:57 PM, Andrew Glasbrenner wrote:
SpaceX starts all nine engines and makes sure they are operating to spec before releasing the rocket from the pad. The shuttle does the same thing with the three shuttle engines before they light the solids.
73, Drew KO4MA
-----Original Message-----
From: "vk1pe.peter"[email protected] Sent: Jun 5, 2010 4:59 PM To: [email protected] Subject: [amsat-bb] Falcon 9 video - moving early?
I think that my eyes are not deceiving me.
See http://www.youtube.com/watch?v=sP5gykvTBpM or http://bit.ly/dx9Vot. Falcon 9 appears to move at about T -3s. The count is still running towards zero in the video, and the "call" seems to be between 4 and 3. What do others think?
Also, were the umbilicals meant to "tear away" (as it moved) or "drop away" (before it moved)?
Peter VK1PE _______________________________________________ Sent via [email protected]. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
Sent via [email protected]. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
--- On Sat, 6/5/10, Joe [email protected] wrote:
From: Joe [email protected] Subject: [amsat-bb] Re: Falcon 9 video - moving early? To: [email protected] Received: Saturday, June 5, 2010, 5:27 PM yES BUT IN THAT VIDEO BELOW IT IS CLEASRLY OFF THE PAD AND MOVING UP AT T-3 SECONDS.
I noticed that as well, but, since I was watching this via webcast, what I saw might have been due to a lag between the video and audio feeds.
73s
Bernhard VA6BMJ @ DO33FL
--- On Sat, 6/5/10, Andrew Glasbrenner [email protected] wrote:
From: Andrew Glasbrenner [email protected] Subject: [amsat-bb] Re: Falcon 9 video - moving early? To: [email protected], [email protected] Received: Saturday, June 5, 2010, 4:57 PM SpaceX starts all nine engines and makes sure they are operating to spec before releasing the rocket from the pad. The shuttle does the same thing with the three shuttle engines before they light the solids.
<snip>
That's been the case even earlier as well. Listen to any of the countdowns for the Apollo lunar missions. The Saturn V's engines would ignite at about T-9 and take a few seconds to produce full thrust before lift-off at T = 0.
If I'm not mistaken, in the very early days, T (or, as it was originally called X) = 0 was when actual ignition occurred, so lift-off was 2 or 3 seconds later.
73s
Bernhard VA6BMJ @ DO33FL
That's been the case even earlier as well. Listen to any of the countdowns for the Apollo lunar missions. The Saturn V's engines would ignite at about T-9 and take a few seconds to produce full thrust before lift-off at T = 0.
I remember the announcer saying something to the effect of, "T minus 9, ignition sequence has started."
That sort of thing is actually common practice. The Shuttle, for example, fires the main engines and allows them to get up to thrust and stabilize while the vehicle is still clamped down, then they fire the solid boosters, then they let it go.
Jeff Moore -- KE7ACY BAR - Born Again Rocketeer CN94
----- Original Message ----- From: "Elan Portnoy" [email protected]
That's been the case even earlier as well. Listen to any of the countdowns for the Apollo lunar missions. The Saturn V's engines would ignite at about T-9 and take a few seconds to produce full thrust before lift-off at T = 0.
I remember the announcer saying something to the effect of, "T minus 9, ignition sequence has started."
Yes we all know this,
and have heard and seen it a hundred times. t-9 and ignition sequence has started, and you see all the engines starting up.
But what the original poster questioned wasn't that. but that it left the pad early.
even on the shuttle or the giant Saturn 5 launches. ignition starts yes long before zero, but the rocket or shuttle never left the ground before zero,
whereas on the video seen here of this launch it is very clear by both the digital timer and audio countdown that the rocket has left the pad and is airborne clearly 3 seconds before zero.
Joe
The Original Rolling Ball Clock Idle Tyme Idle-Tyme.com http://www.idle-tyme.com
On 6/6/2010 2:43 PM, Jeff Moore wrote:
That sort of thing is actually common practice. The Shuttle, for example, fires the main engines and allows them to get up to thrust and stabilize while the vehicle is still clamped down, then they fire the solid boosters, then they let it go.
Jeff Moore -- KE7ACY BAR - Born Again Rocketeer CN94
----- Original Message ----- From: "Elan Portnoy"[email protected]
That's been the case even earlier as well. Listen to any of the countdowns for the Apollo lunar missions. The Saturn V's engines would ignite at about T-9 and take a few seconds to produce full thrust before lift-off at T = 0.
I remember the announcer saying something to the effect of, "T minus 9, ignition sequence has started."
Sent via [email protected]. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
A few years ago at the Amsat Colloquium University of Surrey we were privilaged to have astronaut Ron Parise (SK) as a guest speaker. He explained the ignition suquence for the shuttle in a very entertaining way, as best I remember it went like this
As the engines come up to thrust the explosive bolts fire and away she goes. If one of the pyrotchnics fails its no problem the bolt just gets ripped out of the concrete
73 John G7HIA
________________________________ From: Jeff Moore [email protected] To: [email protected] Sent: Sunday, 6 June, 2010 20:43:11 Subject: [amsat-bb] Re: Falcon 9 video - moving early?
That sort of thing is actually common practice. The Shuttle, for example, fires the main engines and allows them to get up to thrust and stabilize while the vehicle is still clamped down, then they fire the solid boosters, then they let it go.
Jeff Moore -- KE7ACY BAR - Born Again Rocketeer CN94
----- Original Message ----- From: "Elan Portnoy" [email protected]
That's been the case even earlier as well. Listen to any of the countdowns for the Apollo lunar missions. The Saturn V's engines would ignite at about T-9 and take a few seconds to produce full thrust before lift-off at T = 0.
I remember the announcer saying something to the effect of, "T minus 9, ignition sequence has started."
_______________________________________________ Sent via [email protected]. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
participants (6)
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Andrew Glasbrenner -
B J -
Elan Portnoy -
Jeff Moore -
Joe -
John Heath