The Most Famous Shallow Water Boat Ever Made?

LOA: 21’

Beam: 7’ 6”

Fuel Capacity: 50 Gallons

Draft (hull): 10”

Dry Weight: 2,750

Here’s the mud-slinging, tree-eating shallow water high performance boat that even your mom knows about. Viewed and shared by millions of people the very week of its debut and many more since, this rugged machine is like nothing else on (or near) the water. With nearly 200 boats delivered each year to demanding customers like the US Army, Navy, Air Force, Coast Guard and foreign militaries worldwide, Metal Shark possesses unsurpassed expertise in the design and construction of durable, military-grade, welded aluminum boats. The 21 Swamp Shark is available with gas or diesel power and a wide range of custom equipment including LED flood lights, bow hunting lights, rod lockers, coolers, and more. Are you ready to move up to a true high performance shallow water machine? Contact us today to begin the process of building your own Metal Shark powered by Swamp Shark, coming soon to a swamp near you. Click here to download 21 Swamp Shark Spec Sheet

Metal Shark is the exclusive supplier of Swamp Shark technology for military applications. The Swamp Shark propulsion system, patents, and trademarks are the property of Swamp Shark Drives, LLC. For propulsion system inquiries contact

Fully Custom and Versatile Arrangements

The 21 Swamp Shark CC boasts a versatile arrangement that may be customized to suit unique requirements and owner tastes, with unique features available for fishing, bowfishing, hunting, or other uses. The vessel shown here was configured in a basic and rugged no-nonsense layout built to withstand a lifetime of hard use with minimal maintenance requirements. Various T-tops and Bimini tops are available to provide protection from the elements. Rod racks, rod holders, gun lockers, and integrated coolers are all available.  Like all Metal Sharks, each 21 Swamp Shark is 100% digitally designed and may be customized to suit the unique requirements of the operator.

The Swamp Shark Difference

Perhaps the most talked-about marine technology to hit the market in years, Swamp Shark is designed to address the many weaknesses of other propulsion types. Developed and extensively tested in the unforgiving swamps of South Louisiana, Swamp Shark is a high performance propulsion system offering boaters the highest levels of handling and control across a wide range of conditions. A Swamp Shark drive offers many advantages over conventional propulsion systems. Metal Shark, a leading designer and manufacturer of welded aluminum boats and exclusive supplier of Swamp Shark to military and government operators, is pleased to now offer Swamp Shark technology to recreational customers, too.

Read on learn more about our rugged, go-anywhere, do-anything, military-tough Gravois 21 CC powered by Swamp Shark. Swamp Shark is available on other models, too, like the 24 Swamp Shark Dual Console.

Swamp Shark Dwells at the Top of the Shallow Water Food Chain

There are lots of little mud boats out there with puny engines on them, struggling along at putt-putt speeds. Swamp Shark leaves them all in its wake. Swamp Shark handles up to 550 fire-breathing horsepower and a whopping 1,250 Ft.-Lbs. of torque so it’s capable of pushing a real boat – big enough for you, your friends, and all your gear – into even the most hostile terrain. Other options do not compare. Airboats offer high power but are meant to run in a straight line. Water jets require large water inlets that often clog, and outboards do, too. Other options have vulnerable appendages like rudders that snag in vegetation, or are so underpowered that they can’t get out of their own way. Swamp Shark offers the acceleration, speed, and handling of a propeller-driven vessel, it accommodates high power and torque loads, and travels in forward and reverse with equal proficiency. In short, Swamp Shark is the most durable and reliable shallow water propulsion system available.

Swamp Shark’s Patented Rebound System: Unmatched Impact Protection

The Swamp Shark propulsion system consists of several key components: A CNC-cut, machined-steel surface drive; internal/external hydraulic Rebound System; and a specialized internal cooling system, all of completely original design. The patented Rebound System, which consists of actuators inside and outside of the vessel, allows the Swamp Shark drive to smoothly and automatically adapt to conditions. When the drive impacts a solid object, such as a log, stump, or other submerged hazard, it swiftly and smoothly “kicks up” so that the propeller will not be impacted (the leading edge of the skeg features a special radius designed to facilitate quick and smooth passage over any objects it encounters). The Rebound System then exerts reverse pressure to instantaneously return the drive to its normal trim position as soon as the object has been cleared.

Go Anywhere, Thanks to Swamp Shark’s Self-Contained Onboard Cooling System

Swamp Shark features a fully self-contained, patent-pending, onboard keel cooling system, with no appendages beneath the hull, to enable smooth and reliable operation over underwater obstacles. Since there is no need for outside water, a Swamp Shark-propelled vessel can traverse shallow, vegetation-clogged water or even loose mud with no cooling issues. This highly-efficient system cools engine oil, power steering and transmission fluid, and also boost-air intercoolers for turbo or supercharged engines, all with no reliance on outside water. A Swamp Shark exclusive!

The Quality You’d Expect From an Industry Leader

Metal Shark is no fly-by-night operation. A leading defense contractor and supplier of boats for the U.S. Armed Forces, Metal Shark designs, builds, and delivers nearly 200 boats per year. From its three shipbuilding facilities in Alabama and Louisiana USA, Metal Shark employs over 500 American workers who produce aluminum and steel vessels up to 300’ in length for military, law enforcement, fire rescue, and commercial operators worldwide. Metal Shark builds each boat to military-spec standards, and from wiring to welds, the superlative quality of a Metal Shark vessel is evident throughout.  Metal Shark possesses not only the knowledge to design and build boats capable of withstanding years of use and abuse, but the company has the strength and the financial backbone to weather the economy. With a multi-year backlog of fleet contracts worth multiple millions of dollars, customers can count on Metal Shark to be there with unmatched warranty service and technical support. We invite you to contact us to begin the process of building your very own Metal Shark powered by Swamp Shark.

100% Digitally Designed, and Built to Mil-Spec Standards

Each Metal Shark Swamp Shark offering is the result of 100% digital design. The process begins with  Metal Shark’s in-house team of over 60 naval architects and marine engineers, who model every single component of a Swamp Shark vessel using the latest parametric modeling software. Details as minute as the threads on each fastener are included in the digital design, allowing the boat to be fully realized in 3D prior to construction. Cut files are nested and transmitted digitally to CNC routers, which then cut each and every aluminum component to exacting standards. Highly trained welders then assemble each boat, turning plates of aluminum into durable, long lasting works of high performance art. Quality Assurance procedures honed in concert with US Navy and Coast Guard inspectors assure consistent quality output. The result is a repeatable design that may be consistently produced, assuring that each Metal Shark hull will perform exactly as intended.