When I saw this “STS System” for the first time I thought, “Aaahh Great! Another gimmicky whatchamacalit filled with romantic and poetic summersaults with a result of adding weight to my bow. These were my initial thoughts on the STS System. Well the proof in the pudding is in the tasting thereof...

Down to the Nuts and Bolts of the issue.

What is the STS System and how does it work?

Preliminary findings

The STS system is system that mounts to rear of the bows riser. Rather like a cable guard would. There is a rubber stopper at the end of the bar that touches up against the bow string. This bar is held in place by a grub screw on the main body of the STS System that bolts into the rear of the riser.

Once installed correctly the rubber stopper on the end of the STS should be touching the string with very little pressure. If pressure is applied by the rubber stopper to the bow string you run the risk of interfering with the firing cycle of the bow as well as causing excessive ware on the rubber stopper and bow string.

Construction:

All Aluminum anodized Black. The construction is basic and very solid. There are no moving parts.

Design Principle:

When you shoot your bow, the string will make contact the rubber stopper at the end of its firing sequence. This culminates in the stopping of the normal forward travel of the bow string as well as a vast reduction in noise.

Image from STS Archery

There are some advantages of the STS System.

One of the most common causes of the bow string slapping your forearm is either the draw length of the bow is to long as result you are over extended or you are torturing the bow. Even with the correct draw length one can still experience this pain due to bad shooting form.

The STS System stops this by not allowing the string to pass the bows natural brace height position thereby eliminating the string from reaching your forearm…No more pain! This intern allows you to be more accurate without the worry of the bow string slapping you during the shot due to bow torque, excessive bow arm movement or even bad shooting form.

In addition, if you are using string dampers such as the Sims String Leach and alike…take them off, you don’t need them. The STS system is an extremely effective dampener.

By removing all the attached string goodies from the bow string, it allows the string to cycle quicker by removing the excessive weight.

Arrow Speeds and final results:

After about a year after the original was written I conduct some speed tests. Given the fact that I'm a target shooter and don't like drawing the 70# or above, I stuck to 60#. Yes I admit that It's off the IBO and AMO scale, but I wanted to see what this product was really made of for a target archer. The arrows that I used in the test were Easton 328's with a 100gn point. I used variable weights from 330 to 353gn on a 30 inch shaft. This averaged out to approximately 6.02gn per pound. The arrows were numbered 1 through 10 and each arrow was shot 10 times with different configurations on the bow. Each arrow was shot in numerical sequence and clocked through a chronograph.
 

Testing equipment and environment Chronograph: CED-M2 by, Recreational Software Inc. Indoor conditions with good all round lighting. Distance to Chronograph: 3 meters. Distance to Target: 10 meters. Archer: Mark Robertson Bow: Compound - Factory Standard at 29 inch at 60 pounds. Let-off: 65% Arrows: Easton 328 at 29 1/2"

Test #1: No STS System and No Bow Jacks
 

Average Speeds:

My findings show:
 

Speed is sacrificed

* Bow Jacks are Limb Saver type devices that are installed onto the limb in the same manner that one would install an original Sims Limb Saver.

Conclusion:

This test was done in shooting 300 arrows in controlled conditions in three separate scenarios.
I have let the figures speak for themselves. One can conclude one of two things. I believe it would be unfair to mention the type of bow that was used in this test.
Does the STS System work or doesn't it. My answerer is no on the speed front, but the bow is definatly quieter. As all the whatchamacalits in archery there is are sacrifices and a trade-offs. The sacrifice to this clever little device is speed.

You can find their Home Page at: http://www.stsarchery.com