Pictures of the Mustangs used in this experiment (glow not pictured)

About the Flight Numbers
The Mustang have some pretty classic, yet dominate midrange flight numbers. With a Speed & Glide of 5, this is one of the furthest flying mids on the market. 

The 0 turn will help it resist a higher speed throw, showing a little turn if you throw it on angle or off-axis. The 2 fade will be visible as the disc slows down at the end of its flight (or more readily apparent for slower arm speeds).

Understanding some nerdy terminology first
In order to understand what we will be covering in this analysis, it's probably a good idea to familiarize yourself with some more advanced disc terminology. The two key terms are Parting Line Height (PLH) and Dome. 

The Parting Line is what most people call "flashing" on the outer rim of a disc. This flashing or parting line area is where the mold comes together and excess plastic is left when the mold comes out of the cavity. Many smart disc golfers before us began to realize that this line could be used to measure a change in disc stability, or it's tendency to have more or less Turn & Fade. 

Most disc golfers should be familiar with the core disc flight descriptors: Speed, Glide, Turn and Fade

 As noted above, Turn and Fade are generally what have some correlation to the PLH. Speed typically translates to the diameter of a disc and its wing size. These are usually pretty fixed variables, especially when comparing premium plastics. It just doesn't change more. What is commonly known as Glide can be best attributed to a discs dome. The more dome a disc has, the more glide. If you make it super flat, then it becomes a Speed based disc, with minimal glide. This change in dome is also what many have theorized helps to push or pull the Parting Line up and down.

So generally (not always), as the Dome goes up, the Parting Line will go down. This will make the disc less stable, but higher in glide. The same is true for a flat, no-dome disc. As you flatten a discs Dome, the Parting Line will pull up and make the disc a lot more overstable and speed focused.

Table Top Calipers
These things are super handy! We used this device to measure the Dome and PLH on each disc.

What Does All This Data Mean?
We chose two weight classes for Apex, Eternal and Sublime. We have found that 170-173g and 174-177g have slightly different profiles.

Using our calipers in a method similar to the photo above, we measured the dome height. We also aligned the calipers even with the partline line(not shown). We measured these both in Milimeters.

What you'll see here is that the Nocturnal Glow had the flatest dome and the highest parting line. We have found most people consider the Nocturnal to be the most overstable Mustang, which the data does reflect quite well. 

Based on this data the Orange Mustang, with more dome and a lower parting line should be the least stable Mustang (but not a true understable).

Deviations from the Average:
We took an average of all these numbers(see the bottom line), and then compared it to each disc. The average is intended to show a baseline for what a Mustang should fly like. While this isn't perfect, it's a nice starting point to allow us to compare each one more accurately.

How does this affect the flight numbers? (see chart above)
We left speed alone since we did not measure the disc diameter. For Glide, we combined the deviation with the "Actual Flight" that we adveratise of 5.

Because the Partling Line can be used to explain Turn & Fade we combined them into one "flight number". Basically Turn 0 + Fade 2 equals a rating of 2. 

In the future we will call this new number "Resistance" as it reflects the overall High Speed and Low Speed ability of the disc all in one number. This number in addition to glide, will be what we publish with each new run. It is also a number we hope to publish on our websistes disc listings so that you know what stability disc you are buying.

The Glide and PLH deviations were then combined with the actual published numbers(see chart above). This allowed us to create a new set of flight numbers for each run of Mustang.

So based on this data, if you want a high glide Mustang with less stability, go find a 2nd run Domey Eternal.

This data also verified what we have been feeling with the new 2nd Run Sublime Swirl Mustang. They are more overstable than usual, with a little less glide. This makes the Sublime Swirl a perfect disc to fit between your go-to Mustang and a Bobcat. 

Now that you have a good understanding of PLH, Resistance, and Dome, we hope it will help you pick out the best one for you.

Outliers & Sample Size:
We must note that the sample size is very small here. Despite our best effort to categorize these different runs, you will still find discs that are outliers for what we have published here. We can garauntee you that some of these discs will be less or more stable than we advertised here. But this should help give you a head start on what to look for if you want a certain Mustang for your bag.