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- Path: sparky!uunet!portal!lll-winken!taurus.cs.nps.navy.mil!hp850.mbari.org!colu
- From: colu@hp850.mbari.org (Luke Coletti)
- Newsgroups: sci.electronics
- Subject: Re: Pyrotechnics
- Message-ID: <C1H2Dq.1r4@taurus.cs.nps.navy.mil>
- Date: 26 Jan 93 17:39:25 GMT
- References: <1993Jan21.204726.6074@newshub.ccs.yorku.ca>
- Sender: news@taurus.cs.nps.navy.mil
- Organization: Monterey Bay Aquarium Research Institute
- Lines: 28
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-
- The use of computer control for the firing of aerial shells has already
- been done and is sold commercially. The company is Pyrodigital Consultants
- in Pebble Beach, Ca. A more unlikely place to have a "pyro shop" I can't
- imagine, yet since it's in my backyard I was glad to hear of it. The system
- is controlled using a PC and is kept in sync with a musical program via time
- code on a second audio track. It is more work than you can imagine to do the
- scripting for the firing in relation to the music. Samples for each different
- shell type "have to be" tested to determine the time from ignition to burst;
- a timer and photo-optic detector are used. This is hand fed into the master
- scripting program as a prefire offset. When it all works and the bursts are
- in time with the music it is truly awesome. I can remember one occasion where
- the finale was scripted to "Eye of the Tiger" the aerial bombs (6" flash
- powder shells) perfectly created a sustained roll of thunder in sync with
- the music that left me with my jaw hanging. There was of course another
- occasion not so memorable, the units that fire the squibs are each addressed
- over a differential communications line with each unit being manually set
- to a particular address. Well as it turned out the units that were to fire
- the finale were addressed wrong and the entire finale went up only a quarter
- into the show. That sure wouldn't have happened with a hand fired show.
-
-
- Luke Coletti
-
- MBARI
- Monterey Bay Aquarium Research Institute
-