After Field Testing these new toneboards across some of the coldest places to hunt waterfowl in North America in the 2009 - 2010 waterfowl season. We are glad to give you the Anti Freeze Duck Call. It says it all in the name. you will be very hard pressed to Stick or have the reed freeze to the toneboard with this call. Which we all know this is one of the most frustrating things to happen in the blind

These calls will be done with Frosted Neon Green Barrels with Polished Black Inserts Only. These calls have been designed off of our Stub Zero call with its 2 3/8 Barrel, but you may notice that the lanyard groove has a different shape and the band has been replaced with O-rings.  Along with this cosmetic change the barrel is also a Glodo Style barrel paired with a Arkansas style toneboard so the caller can get the most performance out of this call.

Important Tuning Info Click Here

Glodo Style Barrel

Victor Glodo was a legendary market hunter from ReelFoot Lake, Tennessee area.

He is credited with inventing the Reelfoot-style duck call. The Glodo style barrel was conceived while Glodo was helping dig a well. He noticed that sounds from the workers digging the well became more amplified after the walls of the well were undercut to enlarge the bottom of the well. When Glodo added this feature to his call design, he noticed an increase in the resonant volume of the call.

The easiest way to think of a “Glodo style” barrel is to imagine a cone, with the tip of the cone representing the mouthpiece of the call. Glodo style barrels have a smaller diameter mouthpiece and an expanded diameter cavity in the remainder of the barrel. This makes the call a “resonant cavity barrel” which results in a more efficient use of the air used to blow the call.

The Glodo style barrel works so well because it harnesses the efficiency of Bernoulli’s principle. This is a law of fluid dynamics stating that the pressure of a fluid varies inversely with speed, so an increase in speed produces a decrease in pressure, and vice versa. This can be seen by the drop in hydraulic pressure as the fluid speeds up flowing through a constriction in a pipe. The principle also explains the pressure differences on each surface of an aerofoil, which gives lift to the wing of an aircraft. Basically, by constricting the flow of a fluid, such as air, you cause the air to speed up on the other side of the constriction. This design allows the caller to maximize the volume of the call without requiring them to present a large amount of air into the call.