--- 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
