@S1-A.ARPA,@MIT-MC.ARPA:king@Kestrel (07/03/85)
From: king@Kestrel.ARPA As the fullness of a reel increases its moment increases and its angular velocity decreases. We have two degrees of freedom: hub diameter and moment of an empty reel. It seems likely to me that e can make any variations in the angular momentum third-order. I'll do the math when I'm less busy...
rivero@kovacs.UUCP (Michael Foster Rivero) (07/10/85)
In article <2498@mordor.UUCP> @S1-A.ARPA,@MIT-MC.ARPA:king@Kestrel writes: >From: king@Kestrel.ARPA > >As the fullness of a reel increases its moment increases and its >angular velocity decreases. > >We have two degrees of freedom: hub diameter and moment of an empty >reel. It seems likely to me that e can make any variations in the >angular momentum third-order. I'll do the math when I'm less busy... Of course, there's the problem of mass leaving one rotating tape reel and moving to the other on a continuous basis. That makes the math more interesting! Mike
spangler@kvue.UUCP (Lance Spangler) (07/11/85)
There are motion picture cameras which should solve the problems associated with one reel being fuller than the other...and the inertia problems associated with the speed involved. Most everyone remembers the film magazines shaped like mouse ears. Most film cameras (16 & 35mm) still use something like that. But years ago, a 16mm sound camera called a (sp?) Belieau used what was termed stacked loading. That is, the feed reel and the take up reel literally sat on top of each other, with a small hub between each to take care of the difference in reel speed. While I haven't picked up a camera in years (anyone want to buy a complete Bolex 16mm outfit? <:-)) I know the technology still exists. We presently use a RCA portable 1" vtr that uses the same type of stacked loading. Would this sort of setup solve the inerta problems which seem to be creating problems in a weightless environment? I'm not sure, but after reading the hack about opposing reels traveling in opposite directions, I thought I'd throw the idea out. I'm sure Arriflex or who ever is making the motion picture cameras for NASA these days could whip one out. Or for that matter, check with Belieau in France to see if they make a unit suitable for the shuttle. I know the Belieau was a beauty of a camera back in my news photographer days...power zoom...auto iris...a battery that lasted for ever...etc. {ihnp4,seismo,gatech,harvard,ctvax,nbires,ucb-vax}!ut-sally!kvue!spangler Telco: 512-459-6521 (Ext. 2068) Lance Spangler Telco: 512-459-1433 (Pvt. biz line) Senior Producer KVUE Television The only thing we have to Austin, Texas fear is computing itself! <:-)) ((P. O. Box 9927)) zip------> 78766