Micro,
The spool is listed as "size 92" (also from the thread exchange), natural, bonded. It measure about .015 (hard to be precise) with a rated strength of 35 lbs. Rough comparison shows it to be about twice the bulk of the original 16 lbs stuff we used.
I've uploaded a couple of photo's showing the 16 lbs (on the lower left) vrs the 35 lbs (upper right) and you can clearly see the difference. The 16 lbs stuff measures in at around .006" dia.
hope this helps.
jim
Got it! When you are talking 16 and 35 your talking about break strength. 10-4!
Yep I know what ya mean about being precise with the thread sizes, the black Kevlar I've been using lately which is listed as 90lb break strength has a lable on the bottom that shows the thread size and 210? not 207 and is .025" in dia rather then .022" Yet the Natural color(yellow) spool purchase the same time from the same place shows the other dimensions & 90lb test break strength.
Another little factoid I picked up recently concerning Kevlar.
While the material does NOT burn it does start to decompose at 800°F. As this was explained to me by the Dow chemist, as the line is exposed to high heat over 800°F, that part of the line turns to ash and gets a bit thinner in that immediate area with each exposure to that temp level. Add the stress of ejection and we can have line failure at fairly low tension levels.
What this has confirmed for me it that longer shocklines are as important as the initial strength of the line. If we have a long enough shockline allowing the ejected part(s) to slow down before reaching the end of the length, we can use a lighter line break strenght, but must do more to protect it from the degrading heat at it's anchor point.
This gives more credit to the use of Heat resistant Stainless or titanium beading wire Shockcord anchors and prehaps adding a bit of Teflon tape as a protective wrap at the junction loop? Agh! what that heck! Just stick with the thicker/longer line and don't worry to much about it..... how many models get 20+ flights before we lose or total them anyway?
Back to the Dead Ringer Thread!
I started mine last night.
JAL3; I used 38" of the #210 thread black 90lb twirsted kevlar as my shockline. It fits easily with a 1/2" x 12" yellow teflon streamer in the main T2+ Bodytube....using my 1/8" dowel pusher that is! Ya gotta try one!
I found a single wrap of masking tape on the 1/4" inserted part of the coupler made for a much easier centering & alignment between the two glued parts.
Wow! this model does go together quickly!
No Pics yet, I haven't downloaded them from the camera.
