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!!