Concept cars show automakers where they can go with vehicles that are either too costly, unconventional or technical to mass produce. Many large auto shows display these experimental vehicles, and they allow companies to show off new engineering strategies, present more innovative styles and assess whether there is market appeal before trying to create one for purchase. While there’s some expense in building a concept car, that’s also a cheaper pursuit than designing an entire production line of a vehicle that will never find enough customers to be financially successful. For Ford, concept cars have long been a way to think outside its normal vehicle range.

Over the years, Ford has created concepts that pushed the boundaries of performance, aerodynamics, interior layouts and powertrain systems. They ranged from offerings that took the optimism of the space and atomic age in their design concept to lightweight sports cars and ’60s and ’70s concept cars and unique vehicles to some truly high-performance benchmarks. Not every one of those tests projects was intended to go into production, but it is revealing to see how many did, and the forces that helped determine which did and which didn’t.

Reflecting on these abandoned ideas also reveals what was lost when Ford abandoned these concepts. Some cars came up with design ideas that looked like they came from decades in the future, while still others revealed performance that could have given current sports cars and supercars a run for their money. Some of them were ground-breaking prototypes with intelligently designed mechanicals, and others simply aimed to paint a picture of what might have been. From the FX-Atmos of the 1950s to the Shelby GR-1 of the 2000s, these 10 concepts tell one of the more compelling what if stories in the automotive industry.

1. 1954 Ford FX-Atmos

The 1954 Ford FX-Atmos was a snapshot of all the newfangled tech that fired popular imagination in the mid-1950s. Showcased at the Chicago Auto Show in March 1954, this atypical concept drew inspiration from an era of aviation, rocketry, and scientific reaching for the stars. The design was conceived as an alternate to the more typical layout of an existing passenger car, and was built more like a future machine. A notable feature of the FX-Atmos was an centrally-mounted driver’s seat, a setup that would later be seen in several other performance cars, such as the McLaren F1, and the cockpit was protected by a bubble-style canopy modelled on second world war Korean war fighter jets.

Futuristic Features Inspired by Aviation:

• Centrally positioned driver’s seat
• Jet fighter-inspired bubble canopy design
• Aircraft-style control levers for steering
• Roadarscope radar-style dashboard display
• Rocket-inspired rear lights and prominent tailfins

The FX-Atmos carried the aircraft theme into the controls and interior panel. Besides the usual steering wheel, two other control levers in this concept were designed to look like the control columns of a jet aircraft, and the dashboard had an instrument called the Roadarscope, a radar-like device that was supposed to give information to drivers on freeways. Elsewhere on the car were antennae on the front and rocket-nozzle exhaust-shaped taillights, and huge tailfins, as people imagined transportation in the future would be dominated by aerospace and electronics technology.

What Ford missed out on with dropping the FX-Atmos as a concept was the chance to see exactly how far ahead futuristic styling could push the envelope of the modern road car. The unique seating arrangement, aircraft-inspired interior and outlandish exterior made the FX-Atmos too extreme to be considered a normal car. Still, the FX-Atmos is one of many ways Ford was prepared to push the boundaries of mainstream design, illustrating that a concept can have a vision without a costly production run.

2. 1958 Ford Nucleon

The 1958 Ford Nucleon was born at a time when nuclear science had been capturing the imagination of several industries, from electricity generation to aviation. Engineers saw nuclear technology as a potential future for the way we travel and pondered how it could change our daily commutes. Ford took that idea and the totally off-the-wall concept car was a capsule nuclear reactor that could be carried beneath the floor of a car. It was estimated that the Nucleon would be able to power a car for around 5,000 miles on a single nuclear core.

Engineering Ideas Behind Nuclear Propulsion:

• Removable capsule-style nuclear reactor concept
• Projected range of approximately 5,000 miles
• Multiple theoretical power package options
• Forward-positioned cabin above front tires
• Rear space reserved for reactor shielding

Whatever the advantages of its extreme power source, the Nucleon was designed around the problems it posed. Ford built a half-size model rather than a full-size prototype, and the theoretical dimensions were about 16.7 feet long and 6.5 feet wide, with a short 5.8 foot wheelbase. The interior was set over the front wheel, with room at the back for the reactor and its shielding. The Nucleon had an odd look, but given the size of the reactor, it clearly demonstrated just how much a different powertrain could change a car’s design.

Without the Nucleon ever working as a production car, the problem at the heart of the concept wasn’t solved. To be a viable passenger car, any nuclear-powered vehicle would need to have a safe and workable design to house its reactor, defend the passengers and various other engineering factors. As an idea, the Nucleon was now a vision rather than a side-show concept for the showroom floor. But it was not only a strange Ford, it was an example of how hope in the power of a new technology can give rise to cars as incredible as the Nucleon.

3. 1961 Ford Gyron

Gyron challenged the four-wheel automobile with a very different in-line pair of wheels. For the 1961 Detroit Auto Show, the niche car, with its fiberglass body, proved whether or not a crazy shape could work better than an SUV when it came to aerodynamics. Its base depended on a balancing system to keep the car from toppling over, which were aided by stowaway wheels that looked like training wheels on a bicycle when the car wasn’t moving, but once it was up to speed, according to the plan, internal gyroscopes could do the balancing.

The Technology Behind Its Two-Wheel Design:

• Two wheels arranged in a single line
• Narrow fiberglass body construction
• Retractable auxiliary wheels for low speeds
• Proposed gyroscopic system for balancing
• Two-passenger cabin with early mobile phone

While the Gyron was an interesting engineering concept, building it into a working vehicle was problematic. Ford realized that functioning gyroscopes would be prohibitively expensive to develop in their “show car,” and the working Gyron Prototype was built without the balancing capability, and was later fitted with training wheels and could only operate at very low speeds, and then only at about 5 mph, according to some reports. The interior could accommodate two occupants and included an early mobile phone, illustrating how the concept was conceived to be the “car of the future,”. Its narrow body and odd mechanical configuration made it quite unlike other cars Ford was selling at the time.

The Gyron’s story also finished badly. Its concept car was gutted in a 1962 fire, although two other early non-runner prototypes remained. If Ford had succeeded with the balancing technology, it would have offered more scope for a full two-wheel passenger car. But the cost and complexity of the system limited what was practical. The Gyron ultimately proved that a classic concept could excite the public even if the engineering needed to get it on the road wasn’t available within the scope of the project.

4. 1962 Ford Mustang I

Before the 1964 production Ford Mustang made a true pony car from the latest member of the Ford family, the company set out on a quite different course with the 1962 Mustang I concept car. Unveiled in the spring of 1962 at the United States Grand Prix at Watkins Glen, New York, Mustang I was a mid-engine roadster of modest dimensions. This lightweight space-frame chassis, with aluminum body panels, weighed somewere between 1,148 and 1,543 pounds. It was not designed to use all the styling and creature-comfort packages of a typical passenger car; it was built to be a small, lightweight sports car that showcased performance and technology.

Lightweight Construction and Sports-Car Engineering:

• Compact two-seat roadster configuration
• Mid-engine layout with rear-mounted powerplant
• Lightweight space-frame chassis construction
• Aluminum body panels reduced overall weight
• Open cockpit with simple wind deflector

The power originated in a 1.5-liter V4 installed in the back of the engine compartment that generated 100 gross horsepower. Ford’s projection was a top speed of 115 mph, a lofty aspiration for the lightweight that had an open-air design with no windshield or roof, except for a windshield-deflecting bubble. Other exterior details included hand-operated pop-up headlights, side vents for cooling, and a racing-inspired racing fuel-opening. The Mustang I was no show car it was a fully-functioning prototype that could be driven and experienced firsthand.

Ford wanted to show off the Mustang I on a race track. A fellow by the name of Dan Gurney took a turn in the concept car and set times comparable to modern race cars of the time. That showed what this approach could achieve, by the way. But the production model took a different path, weighing more and incorporating a traditional layout and a more mainstream appeal. But you, the enthusiast, were denied a production Mustang along the lines of the Mustang I’s lean and lean-bodied, two-seater sports-car line. The Mustang I did help underscore Ford’s racing interests, and it became a key part of Mustang lore from the very beginning.

5. 1967 Ford Mach 2

The 1967 Ford Mach 2 concept was an effort to investigate a more direct competitor to the Chevrolet Corvette. The design study, created by contractor Kar-Kraft, was also associated with Sports Car Club of America racing classes. Moving away from the front engine setup common in other sports cars, the Mach 2 had its engine installed behind the passenger compartment. The structure of the Mach 2 used a Mustang Convertible floor pan, upgraded rocker sills, and independent suspension on each end to create a sound platform for a car designed with handling in mind.

Performance Hardware Beneath the Mach 2:

• Mid-engine layout behind passenger compartment
• 4.7-liter Windsor V8 engine
• Engine family associated with 271 horsepower
• ZF four-speed manual transmission
• Independent front and rear suspension

The design was based on a 4.7-liter Windsor V8, which is the same size of the engines that Mustang options could achieve up to 271 hp. This was combined with a ZF four-speed manual gearbox and a weight of 2,644 lb. Ford and Kar-Kraft built the two prototypes, with one finished in white and the other in red. The two cars make up an effort to explore how Ford’s available engineering resources could be used to build a one-off sports car with a mid-engine layout. This glimpse of a potential performance model would have competed in a very different way to the production Mustang.

Tragically, despite the promising design, the Mach 2 never made it to market. The white prototype was scrapped in the late-1970s, and the red unit was last seen in a 1969 video taken at Kar-Kraft. However, its vanishing act robbed the world of a production Ford sports car that could have challenged the very notion of what a medium-engined sports car should be based on the mid-engine performance platform it had begun to pioneer. Its role was that of an alternative, a small-displacement, pushrod V8-engined car designed around a very different fundamental concept than the Ford performance cars.

6. 1984-1985 Ford Maya

The Ford Maya was one of the more production-ready concepts in the company’s experimental history. Rendered by italian styling house Italdesign, the wedge sports car was conceived during the mid-80s to go all the way to series production. Ford built three fully functional prototypes from 1984 to 1985, iterating with the design and mechanical package as the programme went on. Reportedly intended for a production rate of 50 per day, the Maya was indeed more than a styling study: its proportions and low angular coupe profile fit right in with the era’s shape language of choice.

Engineering That Brought the Maya Closer to Production:

• Italdesign-developed wedge-shaped body
• Mid-mounted 3.0-liter V6 engine
• Proposed production version targeting 250 horsepower
• All-aluminum independent suspension at both ends
• Three functional prototypes developed

The original Maya came with a mid-mounted 3.0L V6 making 140 horsepower. Ford was even contemplating working with Yamaha on a high-performance street version of 250 horsepower. Its chassis features included fully independent all-aluminum suspension at each end, four-wheel disc brakes, and a five-speed manual gearbox. The drag coefficient of 0.28 was reported, which revealed the thought the designers had put into aerodynamic details. The second developed version was called the Maya II ES, which had cleaner bodywork and a new central air intake, while the third model, called the Maya EM, increased the racing focus, with a twin turbo V6 engine rated at 300 horsepower.

Even with this kind of progress, the Maya was never given the green light for production in a showroom. This was especially frustrating because Ford had three functional prototypes, and had tested a number of different models. It showed that as attractive as the design was, and as good the engineering looked, and even as serious as production was, it couldn’t simply win favor on that basis. If it ever did reach the customers, the Maya would have offered Ford a unique mid-engined sports car that was made almost completely with aerodynamics in mind. This never happened, and the Maya remains one of the most fascinating concept to make it to the brink of production.

7. 1995 Ford GT90

In its day, the 1995 Ford GT90 represented an ultra-competitive entry competing against the best supercars of the 1990s. Underneath its mid-engine bonnet was a 5.9-liter V12 turbocharged by four Garrett T2 units. Power output was 720 horsepower with 660 lb-ft of torque, values that made the GT90 into one of the most extreme performance iterations of the 1990s. Ford spec’d the GT90 for 0-to-60 mph acceleration of 3.1 seconds and quarter-mile time of 10.9 seconds. But it was the predicted top speed of 253 mph which drove the GT90’s speculative on-road performance being somewhat above the norm.

Extreme Performance Specifications:

• 5.9-liter mid-engine V12
• Four Garrett T2 turbochargers
• Rated at 720 horsepower
• Produces 660 lb-ft of torque
• Projected top speed of 253 mph

The GT90 was another bold attempt at Ford’s New Edge styling cues. Its sharp lines were positioned above an aluminium chassis with a five-speed manual transmission, also borrowed from the Jaguar XJ220. The twin-turbocharged V12 had been mated to the bodywork with its combination of aggressive styling and lightweight construction seeming to promise performance on par with the world’s most elite supercars. An initial run of 500 copies was proposed by Ford, giving the impression that the car was more than just a styling exercise but creating a reliable version of the GT90 would require a significant engineering effort.

The biggest challenge was in controlling the heat. A quad-turbocharged powerhouse, the GT90’s incredible torque created heat issues that proved insurmountable they just couldn’t get it where they could keep it cool enough to use it. That was the end of the project, which meant we never saw Ford turn their hypercar concept into a limited-production reality. And while the GT90 is a memorable bit of visionary engineering and eye-catching design, it also proves we sometimes can’t have it all; incredible numbers alone can’t power a production car.

8. 1996 Ford IndiGo

The 1996 IndiGo was another step in Ford’s mid-engine performance car program, but it was also linked to open wheel racing. The IndiGo was envisioned as a production race car for the street, designed to demonstrate the technology found in CART and Indy Car racing. Reynard Racing Cars designed the chassis with a carbon-fiber tub and aluminum composite matrix to deliver stiff torsional performance and occupant protection without adding excessive weight. The open-wheel configuration and odd shape of the car made the IndiGo appear to be more like a race car than a street car.

Racing-Inspired Mechanical Components:

• Reynard-developed advanced chassis
• Carbon-fiber central tub construction
• 6.0-liter V12 producing 435 horsepower
• Six-speed sequential transaxle
• Steering-wheel-operated gear controls

Ensconced within the IndiGo was a 6.0-liter V12 making 435 horsepower and 405 pound-feet of torque. The V-12 was assembled from two 3.0-liter Duratec V6 engines using Cosworth aluminum alloy. Power was directed to the rear wheels through a six-speed sequential transaxle that was operated with wheel-mounted shift paddles, for that true racing feel. A dry weight of only 2,299 pounds accompanied the IndiGo’s powertrain, which garnered special attention from Ford’s R&D department. The blue oval’s engineers were intrigued by the thought of applying track-based knowledge to an automotive conceived to demonstrate how a distinctly specialized performance car might work in a non-competitive environment.

Although it was a working proposal, the IndiGo was never made into a production model. Its prototype status, open wheels and the racing-specific mechanical package made it stand out in any crowd of more conventional customer Ford vehicles. To turn the IndiGo into a production program, Ford would have had to find a way to translate the unusual physical and mechanical concepts into a successful commercial program. What live motorsport fans would have loved was for the IndiGo to have been a racing-inspired Ford for the road it would have been a fascinating take on the racing-to-road-car concept.

9. 2001 Ford Forty-Nine

The 2001 Ford Forty-Nine foray into Ford design DNA took a slightly different tack. Instead of going after high speed or unorthodox body plans, the Forty-Nine was a reflection on the custom hot rod culture that grew around American cars of the era. With a coupe body, the Forty-Nine paired flowing bodywork with 20-inch wheels for a modern take on traditional styling. The interior was created along similar lines, combining 1950s-inspired design cues with modern furnishings to arrive at a retro-futuristic concept that was driven more by nostalgia than by the express purpose of reinterpreting existing themes.

Classic Styling With Contemporary Foundations:

• Low-slung coupe profile
• Polished 20-inch wheels
• Interior inspired by 1950s design
• Ford/Jaguar DEW platform
• 3.9-liter V8 associated with the Thunderbird

The Forty-Nine was built on a Ford/Jaguar DEW platform, shared with the Lincoln LS sedan, and was put on display beneath custom bodywork. Its power was derived from the 3.9-liter V8 that was used in the Thunderbird. Satin-black paint with stainless steel and chrome details further accentuated the thoughtfully designed vehicle. And the Forty-Nine was not just a static styling exercise, but a running show car, which proved that familiar, proven mechanical bits could be used to support a unique design direction.

The Forty-Nine, you see, was not a production model, but the design was not about over-the-top horsepower, or a radically new approach to performance although it may have appealed to buyers wanting a contemporary, cap-shaped coupe that had a retro presence. But that is not to say that a production version would not have found a buyer, or not maintained a particular retro appeal. Perhaps what was lost was the chance to go to market with such a different interpretation of classically American looks. And the Forty-Nine serves as a reminder that concept cars are about exploring one facet of our culture as much as they are about working out the technical details.

10. 2005 Ford Shelby GR-1

The 2005 Ford Shelby GR-1 came to life after the mid-engine Ford GT was launched and Ford’s Advanced Product Creation team decided to pursue a different high-performance vision. Borrowing inspiration from the Shelby Cobra Daytona Coupe, the GR-1 concept featured a keenly honed fastback body, flared rear quarters and long, low front end. With its front mid-engine placement, the GR-1 concept has an entirely different attitude from the mid-engine GT and showed that Ford was willing to pursue a different approach. This mix of inspiration from the past mixed with the proportions of a modern supercar.

Performance and Design of the Shelby GR-1:

• Front-mid-engine layout
• V10 engine producing 605 horsepower
• Reported weight of approximately 3,900 pounds
• Functional aluminum chassis and body setup
• Fastback styling inspired by the Cobra Daytona Coupe

Back under the long hood was a V10 of 605 horsepower. Weighing in (so we’ve heard) at about 3,900 pounds, the GR-1 was obviously intended to be the total-package (sharp looks plus real straight-line performance). The car’s aluminum chassis and body assembly (all structural and functional) indicated a strong engineering presence, not just design. Tied to the car’s philosophical underpinnings were its connections to the Cobra Daytona Coupe and re-imagination of a known body style of performance car design. As such, the GR-1 was also a technical trial effort of sorts, but also essentially a re-imagination of a known sports car shape.

While the frame and appearance seem ready for the road, the Shelby GR-1 never went into production. Ford had difficulty pushing the new supercar in today’s market, and the decision was made to abandon plans for the production version of the GR-1 before the manufacturing line could even be built. It was an unfortunate decision for those interested in a road going version of this concept vehicle that also packed a large V10, front-mid engine location, and fastback body styling. In the case of the Shelby GR-1 the loss of a prototype to production demonstrates how the commercial performance of one vehicle can have a direct impact on the development of another.