Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP
Posting-Version: version B 2.10.2 9/18/84; site Shasta.ARPA
Path: utzoo!watmath!clyde!burl!ulysses!mhuxr!mhuxt!houxm!mtuxo!mtunh!mtung!mtunf!ariel!vax135!petsd!pesnta!greipa!decwrl!Glacier!Shasta!brain
From: brain@Shasta.ARPA
Newsgroups: net.columbia
Subject: Re: IMAX and the Shuttle flights
Message-ID: <6695@Shasta.ARPA>
Date: Thu, 4-Jul-85 19:56:09 EDT
Article-I.D.: Shasta.6695
Posted: Thu Jul  4 19:56:09 1985
Date-Received: Sun, 7-Jul-85 05:54:19 EDT
References: <1306@islenet.UUCP> <900001@pbear.UUCP>
Organization: Stanford University
Lines: 18

> 
> > One of the problems that they had filming the movie was the gyroscopic
> > effect of the film reels in the camera.
> 
> One simple way to fix that is to have the film reels turn in oppisite
> directions. This way the gyroscopic effect is almost cancelled.
> 
> Peter Barada
> {ihnp4!inmet|{harvard|cca}!ima}!pbear!peterb

Since most of the spinning mass is in the film material itself, and since
that mass is initially all on the supply reel, and eventually all on the
take-up reel, if you have counter-rotating reels, the camera will initially
behave like a gyro spinning in one direction, slowing down, and changing
its direction of spin.

The problem of cancelling out the gyroscopic effects in that type of
system is fascinating!!