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From: don@umd5.UUCP
Newsgroups: net.columbia
Subject: Re: Re: IMAX and the Shuttle flights
Message-ID: <635@umd5.UUCP>
Date: Fri, 5-Jul-85 13:31:23 EDT
Article-I.D.: umd5.635
Posted: Fri Jul  5 13:31:23 1985
Date-Received: Thu, 11-Jul-85 05:58:33 EDT
References: <1306@islenet.UUCP> <900001@pbear.UUCP> <6695@Shasta.ARPA>
Organization: U of Md, CSC, College Park, Md
Lines: 38

>> 
>>> 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
> 
> Since most of the spinning mass is in the film material itself  ...
>  ...  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.
> 
*** REPLACE THIS film-reel WITH a constant rotational momentum ***
All one would need (unless my Physics is more than rusty and is just plain
rotten) is a means of having an almost constant rotational momentum for the
opposite spinning reels of film.
The mechanism would work like the classic spinning ice-skater to change
the momentum as the amount of film changes on the reel... a couple of weights
the can be moved inversely to the amount of film on the reel... the weights
would be attached to a spinning rod that is in turn attached to the reel.

Voila! (the added mass might even make the camera work more smoothly)
(on the other hand, the film is only so strong --- SNAP!)

Anybody got some other random thoughts on the matter ? (pun intentional)

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