Yes, and many larger, clustered rockets do this.

http://en.wikipedia.org/wiki/Space_Shuttle_Solid_Rocket_Booster#Hold-down_posts

<http://en.wikipedia.org/wiki/Space_Shuttle_Solid_Rocket_Booster#Hold-down_posts>It
is more impractical for small rockets because, where you might loose a
tenths of a second holding down the shuttle, that's a tiny percent of the
total impulse. For a rocket that only burns for 3 seconds, a few tenths of a
second is several percent of your burn time. Then again, it won't result in
the loss of your vehicle one motor doesn't light.

I suspect the real reason no one does this is because of the complexity of
the project. You need to understand electronics / sensors / real time
pr embedded programing / hold-down mechanics.  Instead I think the more
experienced builders choose to double up on their pyrogen, pay a little more
attention to the igniter mounting and call it a day.

On Wed, Aug 4, 2010 at 5:34 PM, Frank Mathew <fpmat...@comcast.net> wrote:

> 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?
>
> Frank
> --------------------------------------------------
> From: "W Isaac Carroll" <icarr...@pobox.com>
> Sent: Monday, August 02, 2010 2:55 PM
> To: "James Perkins" <ja...@loowit.net>
> Cc: <psas-team@lists.psas.pdx.edu>; "I" <kirk...@pdx.edu>
> 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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