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

John Heath g7hia at btinternet.com
Mon Jun 7 07:44:20 PDT 2010

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 <tnetcenter at gmail.com>
To: amsat-bb at 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

----- 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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