[amsat-bb] Re: Falcon 9 video - moving early?

Joe nss at mwt.net
Sun Jun 6 13:08:02 PDT 2010

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.


The Original Rolling Ball Clock
Idle Tyme

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"<elanportnoy at 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."
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