So, I gots some spools of kelvar. 29 Den, on a 4" x 8" core, 1" of material on it. How would I know how much yardage is on it, and, how much would someone buy this for? not sure what anyone would do with such a small denier of kevlar :-/
I assume 8" wide core correct? Does the material cover all 8" and also does the material tapper like a football shape or form a vertical wall? How wide/thick is the tow/yarn? I have a calculator I made in excel that will tell the length but I need to know the above questions.
Edit: it is a spool and not a reel correct? I assume so cause you’ve been playing with looms.
i did not know there was a difference between spool and reel. I know there are straight spools, and cone spools 
But no, straight paper tube.
Size of the tow, the best I can measure is about 0.0015" thick by 0.012" wide as it lays.
Vertical wall. Exact material measured size is 7" wide and rolled up to 1" thick.
On a spool the tow oscilates across the core before it winds up another layer in thickness, a reel just doesn’t oscolate like a roll of toilet paper.
I am curious about the dimensions of your tow cause I came out with 73.9 KM (73,826 meters) or 583 oscilations per layer. :eek: Is the tow really that small? A standard tow for AFP/ATL is .2-.26MM yes prepreg but still not even close to the .0381mm of your material.
What is the approx weight? Denier is a measure of weight vs length. (mass in grams of 9000 meter yarn.) So your 29 denier is 29 grams per 9000 meter (some 5.5 miles)
With the claimed 73 km by Rotorage, your spool weighs some 320 grams (is that 10 or 12 oz?)
1910g weight.
it’s small 
odd, won’t let me post. 1910g weight.
it’s small
http://imgur.com/kzN9UBc incase the image doesn’t attach