This is a new version of the Twin Loops sling that was made by adding a cobra weave on top of the west country whipping at the pouch center.

The cobra weave added 31” of additional paracord on top of the 33” of paracord used in the west country whipping. Per google, the paracord weight increased from 6.2 grams (WCW only) to 12.5 grams (WCW+cobra) at the pouch center.


Compared to a 59 grams tennis ball, the weight added by the paracord to the pouch center went from making the tennis ball feel 10.5% heavier (WCW only) to 21.2% heavier (WCW+cobra).

Pic of new sling shown.

Tutorial to make this Twin Loop sling is shown here….scroll down and see the version using west country whipping at the pouch center. 
https://slinging.org/forum/YaBB.pl?num=1780363211


Comments on how the west country whipping version of the Twin Loop sling feels/performs:
https://slinging.org/forum/YaBB.pl?num=1780366421

So how does this new sling perform??

As noted in the link in the first post above, comments about the WCW-only Twin Loops sling included:

-more accurate with much less scatter vs seatbelt sling
-tennis ball felt heavier and easier to throw. Felt like ball went where I threw it.
-sling felt “snappy” and released quickly. Google says extra pouch weight pulls harder on retention cord…this extra pulling snaps pouch open quicker.

Adding even more pouch weight by tying the cobra weave on top of the WCW basically amplified all of the above characteristics and made the sling even more accurate and “snappier”.  The main difference is while the WCW-only makes the tennis ball feel heavier, adding the cobra weave makes the tennis ball feel HEAVY!!!

That was the overwhelming impression. It really does not feel like a tennis ball at all. It feels like a much heavier ball. I would say the sling also feels like it takes way more effort to throw. I think that is because the weight or heaviness is felt in your hand (maybe extra pulling on the retention cord due to extra pouch weight).


At the moment, I prefer how the WCW-only Twin Loop sling feels with the less throwing effort despite adding the cobra weave increasing the sling’s accuracy slightly.  That is just me. But the knock on tennis balls are they are too light and both versions of this Twin Loop sling help with that significantly.

Hope to do some distance throwing to see if there is any difference soon.

Excellent video. Thanks for sharing that. Love seeing data!

For me, heavier ammo is more accurate to throw. I have thrown from plastic whiffle golf balls all the way to egg sized rocks and consistently found heavier ammo just has a better feel and goes where I throw it. By adding weight to the pouch, tennis balls feel heavier and I throw them significantly more accurately (seatbelt vs Twin Loop sling…..both paracord slings….no idea how woven sling throws)


More accurate (cause I can better feel the ball) but I don’t think faster. I made no claim power/velocity has increased. In fact my intuition says the heavier thing throws slower and therefore not as far. I hope to throw for distance soon. That will give me good data and I can really see the velocity/distance penalty (if there is one). I will surprised if the heavier feeling sling out distances the lighter sling.



The Twin Loop sling does feel “snappy”. Initial throws were to the right (like an early release). Why?? Not sure to be honest   

“Snappy” can be explained by the pouch opening quicker. Force = retention cord mass times acceleration…..the greater pouch weight means higher cord tension (force) so the retention cord should accelerate faster out of the way.  Faster accelerating release cord would “snap” out of your hand. This might be true.

Alternatively half the pouch is mostly air bracketed by a top and bottom paracord. So there is minimum material for the tennis ball to push out of the way. Tennis ball then “escapes” out of the pouch faster. Or you could say the tennis ball “snaps” free faster.   This might be true too.

I also don’t think really understand the geometry fully. At the moment of release, I imagine the release cord could be in front of the tennis ball with some throwing styles.   I could also see the release cord on top of the tennis ball with other styles. So the direction the release cord moves “to get out of the way” can be radically different depending on where the release cord starting position is.  Easier “get out of the way” paths should be “snappy”??

There is also this idea in my head the pouch applies a clamping force on the ball during the spin. Let go of the release cord and the clamping force goes to zero. This can’t be instantaneous….there must be some amount of time due to inertia of the release cord….dragging the clamping force application out for a longer time. If this time is then reduced or minimized somehow, the sling feels “snappy”??

bandit111964 wrote on Jun 15^th, 2026 at 10:49pm:

100%!  You and most slingers.  A little more weight in the pouch means more feedback for you to work with.


bandit111964 wrote on Jun 15^th, 2026 at 10:49pm:

Sorry.  My misinterpretation.  Descriptors like "snappy' and "quicker release" tend to indicate a faster moving projectile.  I was just reading through things a little too quickly, so my fault.  I didn't mean to misrepresent.


bandit111964 wrote on Jun 15^th, 2026 at 10:49pm:

It's not about the release cord being in front of the ball (although that can absolutely happen).  It's about the direction the projectile moves when the sling is released.  The projectile will try to move in a tangential line to the arc of the sling.  But the sling is in the way because it's still rotating.  It's literally just for a split second, but this happens with any projectile and any sling.  You can see it pretty well in this video from Goober: https://www.youtube.com/watch?v=rEUM6-XarKM.  Thinner and lighter slings will interfere with the projectile less.  Which is why they tend to have faster/cleaner releases.  You mentioned the tennis balls going to right.  That means you're getting a cleaner release from the sling.  Strangely that's not necessarily a good or bad thing.  It depends on the slinger and what they prefer.


And great test data!   The different results between the styles is interesting.


bandit111964 wrote on Jun 15^th, 2026 at 10:49pm:

A while back IronGoober made a post about the amount of time it took for a projectile to clear the pouch and how it related to the amount of spin that resulted.  I can't find it.  If anyone can dig it up and post the link, I'll give you a virtual pat on the back.

I have some 1000fps footage of several different slings opening with tennis balls… let me dig it up and find a place to drop the footage so you can see what is happening during the release… may take a few days (weeks?) to get it all together.

The “ideal” sling disappears suddenly just as the ammo is exiting the pouch. Once the ammo is accelerated, any further interaction with the projectile will knock it off course. I noticed this while experimenting with two slings of identical geometry but with different surface friction properties. The higher friction surface was hitting more to the right with a left-handed sidearm throw, and the low friction projectile had significantly less spin.  I guess I need to add this to the list of thimgs that need a more formal and methodical testing regime 🤷‍♂️

Bandit,
There are two main reasons to add spin: stability is one, and this depends on the specific aerodynamic characteristics of your ammo. The other reason for spin is Magnus effect, which can alter the trajectory of the ammo in flight.