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I have no clue if this will help: http://www.soundabout.net/audio/convert-cassette-to-cd/reel-to-reel-tape-running-times/ On 10/25/2018 11:54 AM, Nick Patterson wrote: > Dear collective ARSC wisdom, > > I'm looking for reference resources for the estimation of the time used on > *partially-full* open-reel audio tapes. > > I'm aware of resources that calculate timings (based on various factors) > for *full* audio tape reels, such as: > > https://www.weareavp.com/open-reel-audio-duration-calculator/ > > But, I'm wondering if anyone might be able to point me towards a stable and > authoritative reference for similar calculations for *partially* full reels. > > So, a sample problem would be: > > What is the duration on a reel which is 7", 1.5 mil tape, recorded at 7.5 > ips, and has a tape-pack diameter of 4.5 inches on the reel (assuming a > 2.25 inch center hub)? > > We have a working estimation method in place, for the project I'm current > working on, but I'd like to find an authoritative reference in the > community, that documents this. > > If anyone knows of such a resource, I'd appreciate any info! > > P.S. the engineers amongst you may scoff that this is simply math, but, > math is not my strongest suit, hence my search for a stable reference, > rather than back-of-the-napkin calculation - please don't judge too harshly > :-) > > best regards, /Nick > > > Nick Patterson, Music Librarian > Music & Arts Library, Columbia University > 701 Dodge, 2960 Broadway > New York, NY 10027 > 212-854-8523 > > --- > This email has been checked for viruses by AVG. > https://www.avg.com >