The Jet WACO Biplane, the WACO Aircraft Legacy from Ohio to Oshkosh, and the Turbine Conversion That Asked What a Classic Biplane Could Become

At AirVenture 2026 in Oshkosh, Wisconsin, among more than ten thousand aircraft and over six hundred thousand visitors, the photograph that circulated widest across the aviation community was of a biplane. Not a warbird behind a velvet rope - a biplane under jet power, vertical off the deck, doing things the original designers never imagined. AVweb titled the image Sky Dancing. It earned the name.

The aircraft is known as the Jet WACO. Understanding why it matters starts with understanding what WACO is, and where it came from.

WACO: The Weaver Aircraft Company of Ohio

WACO stands for Weaver Aircraft Company of Ohio. The company was founded in 1919 in Medina, Ohio by three aviators: Elwood Junkin, George Weaver, and Buck Weaver. Operations moved to Troy, Ohio within a few years, and it was there that the company built its reputation.

Through the 1920s and 1930s, the WACO name became synonymous with a particular vision of sport flying - one that was fast, honest, and aesthetically deliberate. These were not minimum-viable aircraft. The engineering intent was visible in how they flew. They told the pilot exactly what they were doing.

WACO’s Role in the Barnstorming Era

WACO emerged during the barnstorming era, when air racing was a national spectacle and every flight carried the weight of proving human flight possible. County fairs across the Midwest featured pilots doing aerobatics and passenger rides for crowds who had never left the ground.

WACO built aircraft for that world. Their biplanes were fast by the standards of the day, responsive, and structurally honest. By the mid-1930s, WACO was one of the most prolific aircraft manufacturers in the United States, producing dozens of models - cabin biplanes for the business traveler, open-cockpit sport planes for the enthusiast, and military trainers.

WACO Aircraft in World War II

The WACO story is not just aerobatics and county fairs. The UPF-7 trainer was used extensively to prepare military pilots for combat. More significantly, the CG-4A glider, built by WACO under wartime contract, carried Allied troops into occupied France on D-Day and into Holland during Operation Market Garden.

A biplane company from Troy, Ohio put soldiers into the sky over Normandy. That is not a footnote - it is a central chapter of what the WACO name actually represents.

How WACO Disappeared - and Came Back

The postwar civilian market destroyed WACO, as it did most piston manufacturers of that era. The federal government flooded the market with surplus military trainers - Stearmans, Fairchilds, PT-19s - available for a few hundred dollars. WACO could not compete. The company folded in 1947.

The idea did not fold with it. In the 1980s, a group of aviation enthusiasts began the process of reviving the WACO name. WACO Classic Aircraft Corporation, based in Battle Creek, Michigan, eventually returned the YMF-5 to production. These are not kit planes or tribute reproductions. They are manufactured aircraft certified under FAA Type Certificate standards, built from designs that trace directly to the original WACO engineering.

What the YMF-5 Offers Pilots Today

The YMF-5 is an open-cockpit biplane powered by a 300-horsepower radial engine. It cruises around 100 knots, has a service ceiling of roughly 14,000 feet, and carries a range of approximately 400 miles.

It is not designed for long GPS-routed legs at altitude. It is designed for the kind of flying where you depart in the morning, fly low and slow over visible terrain, land at a grass strip for lunch, and return in the afternoon. The communication between pilot and aircraft is direct and unfiltered. More automated machines do not replicate it.

Why Turbine Conversions Change an Airframe’s Character

Turbine conversions on proven airframes follow a consistent logic: the structure works, the aerodynamics are known quantities, and the handling characteristics are established. What changes is the powerplant - and with it, the aircraft’s entire performance identity.

Turbines offer reliability that reciprocating engines cannot match at the same class level. Carburetor ice is not a turbine concern. Vapor lock does not apply. The mechanical complexity that makes piston engines vulnerable - thousands of components in precise coordination, each a potential failure mode - is simply absent from a turbine’s operating reality.

Turbines also burn Jet-A fuel, which matters for a reason beyond performance. The aviation industry is actively working through the phase-out of 100 low lead aviation gasoline via the FAA’s EAGLE initiative (Eliminate Aviation Gasoline Lead Emissions). Turbine aircraft step outside that problem entirely. Jet-A is already unleaded, already widely available, and will remain so past whatever transition timeline the piston fleet navigates.

What the Jet WACO Is and Why It Matters

Put a turbine in a WACO biplane and the performance envelope changes categorically. Climb rates belong to a different class of aircraft. Aerobatic maneuvers carry energy reserves the original radial could not sustain. The aircraft can pull vertical off the deck at Oshkosh and make six hundred thousand people stop talking mid-sentence.

And it still looks, unmistakably, like a 1930s biplane. The stacked wings. The wire bracing. The visual vocabulary of a century-old era, executing performance the era never imagined. That is the cognitive dissonance in Sky Dancing. Something that should be slow is very obviously not.

The Regulatory Framework: STCs and the Experimental Category

Modifying a certified aircraft with a different powerplant requires a Supplemental Type Certificate (STC) from the FAA - formal approval that a specific modification to a specific airframe meets airworthiness standards. The STC process involves engineering analysis, flight testing, and documentation. It is not simple or inexpensive, but it produces a legal, insurable, flyable aircraft.

Turbine conversions carry STCs on a number of well-known airframes. The most commercially significant is the Cessna 208 Caravan - an airframe that became, with the right powerplant, one of the most capable utility aircraft in the world, serving cargo, parachute, bush, and island operations globally.

For experimental and custom-built aircraft, the FAA experimental category provides significant design and modification latitude in exchange for restrictions on commercial operations and a requirement that the aircraft be operated primarily for education or recreation. The most innovative aircraft flying today were largely born in that category, because it permits the iterative development the certified world cannot support.

AirVenture and the Community That Built This Culture

The Jet WACO did not emerge in a vacuum. It emerged at AirVenture, produced annually by the Experimental Aircraft Association (EAA), an organization founded in 1953 by Paul Poberezny in Milwaukee, Wisconsin on the premise that aviation should be accessible to builders and modifiers - not just those who could afford factory-built aircraft.

That philosophy has shaped Oshkosh across seven decades. The soul of AirVenture is the experimental community: builders who solved engineering problems in garages because the certified pathway was too slow, too expensive, or too unwilling to entertain new ideas. A Jet WACO belongs at Oshkosh because it answers the central question that community has always asked: what is this airframe capable of, given everything we now know?

Preservation vs. Evolution: Aviation’s Ongoing Debate

The Jet WACO sits at the center of an unresolved argument in aviation. One side holds that classic aircraft should be maintained as close to original specification as possible - that their value is historical and documentary, and that modification is a kind of loss.

The other holds that aviation is a living tradition. That the engineers who designed these airframes were pragmatists who would have used whatever powerplant made the aircraft better, and that freezing a design in amber at a specific moment in time would have struck them as foreign.

Both arguments carry weight. The Corsairs and Stearmans flying in original configuration serve a role nothing else can fill - a direct physical link between pilots today and the pilots who flew them when those aircraft were current technology. That is irreplaceable.

The Jet WACO is making a different argument. It asks what happens when you hand the visual language of a classic era the performance tools of the present one. At AirVenture 2026, the answer was a photograph called Sky Dancing - and a flight line that went quiet.

Key Takeaways

• WACO Aircraft Company was founded in 1919 in Troy, Ohio and became one of the most prolific U.S. manufacturers of the 1920s–30s before folding in 1947; WACO Classic Aircraft Corporation revived the YMF-5 in Battle Creek, Michigan in the 1980s.
• The WACO CG-4A glider carried Allied troops into Normandy on D-Day and into Holland during Operation Market Garden - a largely overlooked chapter of the company’s legacy.
• The Jet WACO combines the classic biplane airframe with a turbine powerplant, producing climb rates and aerobatic energy reserves far beyond what the original radial engine could sustain.
• Turbine-powered aircraft run on Jet-A fuel, which is already unleaded - placing them entirely outside the industry’s ongoing effort to phase out 100LL avgas under the FAA’s EAGLE initiative.
• AirVenture 2026 drew more than 600,000 visitors and 10,000 aircraft; the Jet WACO’s performance there was among the most widely shared images of the event, sparking debate over preservation versus evolution in classic aviation design.