Doesn't the Space Shuttle have such a mechanism to hold the vehicle down for the six seconds between main engine ignition and SRB ignition?

From: "W Isaac Carroll" <>
Sent: Monday, August 02, 2010 2:55 PM
To: "James Perkins" <>
Cc: <>; "I" <>
Subject: Re: [PSAS] Sony-sponsored student rocket project

A number of orbital rockets use a hold-down mechanism to ensure all
motors are firing properly before liftoff. How feasible would
something like that be for an amateur rocket? For example, could there
be a link that would disconnect under the thrust of all three motors,
but not under the thrust of just two?

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