[amsat-bb] Re: Falcon 9 video - moving early?
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 tnetcen...@gmail.com To: amsat-bb@amsat.org 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 elanport...@yahoo.com 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 amsat...@amsat.org. 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 amsat...@amsat.org. 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
[amsat-bb] Re: Falcon 9 video - moving early?
And I heard in a presentation at the Cape some years ago that We are so sure the solid rockets will ignite that we send the command to blow the hold down bolts before we send the solid rocket ignition command. Also I heard from somebody that the fractured hold down bolts are presented to the shuttle crew members as souvenirs after they return to Earth. Dan Schultz N8FGV 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 ___ Sent via amsat...@amsat.org. 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
[amsat-bb] Re: Falcon 9 video - moving early?
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 amsat...@amsat.org. 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
[amsat-bb] Re: Falcon 9 video - moving early?
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 Portnoyelanport...@yahoo.com 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 amsat...@amsat.org. 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 amsat...@amsat.org. 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
[amsat-bb] 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 vk1pe.pe...@gmail.com Sent: Jun 5, 2010 4:59 PM To: amsat-bb@amsat.org 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 amsat...@amsat.org. 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 amsat...@amsat.org. 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
[amsat-bb] Re: Falcon 9 video - moving early?
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.petervk1pe.pe...@gmail.com Sent: Jun 5, 2010 4:59 PM To: amsat-bb@amsat.org 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 amsat...@amsat.org. 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 amsat...@amsat.org. 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 amsat...@amsat.org. 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
[amsat-bb] Re: Falcon 9 video - moving early?
--- On Sat, 6/5/10, Joe n...@mwt.net wrote: From: Joe n...@mwt.net Subject: [amsat-bb] Re: Falcon 9 video - moving early? To: amsat-bb@amsat.org 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 ___ Sent via amsat...@amsat.org. 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
[amsat-bb] Re: Falcon 9 video - moving early?
--- On Sat, 6/5/10, Andrew Glasbrenner glasbren...@mindspring.com wrote: From: Andrew Glasbrenner glasbren...@mindspring.com Subject: [amsat-bb] Re: Falcon 9 video - moving early? To: vk1pe.pe...@gmail.com, amsat-bb@amsat.org 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 ___ Sent via amsat...@amsat.org. 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
