A NASA engineer accidentally created the Super Soaker from a leaky heat pump
In 1982, NASA aerospace engineer Lonnie Johnson was working at the Jet Propulsion Laboratory on a new heat pump that used water instead of Freon. When he tested a homemade nozzle in his bathroom sink, a powerful jet of pressurized water shot across the room into the bathtub. Johnson realized the propulsion mechanism would make an incredible toy, patenting the pressurized water gun that became the world-famous Super Soaker.
An Accidental Blast in the Bathroom
In 1982, Lonnie Johnson was spending his evenings working on an independent thermodynamics project in the bathroom of his home. By day, he worked as a systems engineer at NASA's Jet Propulsion Laboratory in Pasadena, California, helping design power and propulsion systems for complex interplanetary spacecraft. In his personal workshop, however, his focus was on domestic energy efficiency. Johnson was attempting to design an environmentally conscious heat pump that could operate using water rather than chlorofluorocarbons, commonly known as Freon, which were increasingly recognized as destructive to the Earth's ozone layer.
While testing a series of custom-machined brass nozzles attached to his bathroom sink faucet, Johnson turned on the tap to evaluate fluid flow. Instead of the gentle, controlled stream of water he expected to study for his heat pump condenser, the nozzle abruptly released an intense, pressurized jet of water that shot completely across the room, striking the far wall and splashing down into the bathtub. Rather than merely being annoyed by the mess, Johnson paused to examine the mechanics of what had just occurred. He realized that the pressurized fluid propulsion he had inadvertently created held tremendous potential as a high-powered recreational water toy.
The Physics of Stored Pneumatic Pressure
To appreciate why Johnson's discovery was revolutionary, one has to examine the engineering of water guns prior to the 1980s. For decades, consumer squirt guns relied almost entirely on a small mechanical displacement pump connected directly to a finger trigger. When a child pulled the trigger, a tiny piston squeezed a minuscule volume of water through an open nozzle. The velocity and distance of the spray were limited strictly by the instantaneous finger strength of the user. These toys could typically only propel small droplets a few feet, producing a short and relatively weak discharge that quickly lost momentum.
Johnson's design radically rethought fluid dynamics in a toy by separating the pumping action from the trigger mechanism. Instead of pushing water directly with the trigger, the user operated an integrated manual piston pump to compress air inside an enclosed reservoir containing water. As more air was pumped inside, pressure steadily built within the closed chamber. When the user finally depressed the trigger, it simply opened a valve, allowing the compressed air to violently expand and drive a thick, continuous column of water outward with high velocity and exceptional range. Early hand-built prototypes were constructed from Plexiglas, PVC pipes, O-rings, and an empty two-liter plastic soda bottle mounted upside down to serve as the air-pressure reservoir.
An Aerospace Mind Applied to Everyday Invention
Johnson was uniquely equipped to solve these mechanical challenges due to an extensive background in rigorous aerospace engineering. Growing up in Mobile, Alabama, during the era of racial segregation, Johnson showed a natural talent for inventing from an early age. In high school, he constructed a compressed-air-powered robot named Linex entirely out of scrap metal and discarded parts, taking first place at an Alabama science competition in 1968. He went on to attend Tuskegee University, earning a bachelor's degree in mechanical engineering followed by a master's degree in nuclear engineering.
His professional career took him into the United States Air Force, where he contributed to advanced engineering projects including the development of stealth bomber technology, and later to NASA's Jet Propulsion Laboratory. At JPL, Johnson served as a systems engineer for the historic Galileo mission, which was designed to send an unmanned spacecraft to orbit Jupiter and deploy an atmospheric probe. The demanding discipline required to calculate thermodynamics, fluid mechanics, and pneumatic power systems on deep-space exploration vehicles was the exact technical foundation that informed his domestic prototyping.
The Seven-Year Journey to the Market
Despite the elegance of the invention, turning a handmade prototype into a commercial product proved exceptionally difficult. Johnson filed for a patent on his pressurized water gun in 1983, receiving U.S. Patent 4,591,071 in 1986. Initially, he attempted to manufacture and distribute the gun independently, but the estimated capital costs for tooling and production molds exceeded what an individual engineer could comfortably finance. He spent years pitching the concept to various manufacturing companies, but met with skepticism and repeated rejections.
The decisive turning point arrived in 1989 when Johnson attended the American International Toy Fair in New York City. There, he connected with representatives from Larami Corporation, a Philadelphia-based toy firm. Later that year, Johnson traveled to the Larami headquarters for an in-person demonstration. Rather than relying on simple drawings or patent documents, Johnson opened a briefcase, assembled his custom prototype on the conference table, and pumped the chamber. He pulled the trigger, blasting a powerful jet of water straight across the boardroom into an awaiting trash can. The executives were stunned by the sheer power of the blast and signed an agreement to produce the gun.
A Cultural and Commercial Phenomenon
The toy made its commercial debut in 1990 under the initial name "Power Drencher." While it sold respectably in its initial run, the toy exploded in popularity in 1991 after being rebranded as the "Super Soaker." Larami backed the relaunch with a targeted national television advertising campaign that highlighted the weapon's massive range, large water capacity, and devastating advantage over traditional squirt guns. The toy instantly captured the imagination of American children and teenagers, fundamentally shifting summer outdoor play.
The commercial numbers rapidly reached historic proportions for the toy industry. In 1991 alone, millions of Super Soakers were sold, generating hundreds of millions of dollars in retail revenue and quickly becoming the top-selling toy in the United States. As new models with larger reservoirs, quick-fill attachments, and multiple nozzle settings were introduced, the Super Soaker evolved into an enduring cultural staple. Hasbro subsequently acquired Larami in the mid-1990s, integrating Johnson's pneumatic platform into its broader Nerf lineup.
Funding Clean Energy Through Toy Royalties
While Johnson achieved financial success and widespread recognition through the Super Soaker, his relationship with manufacturers was not without challenges. In 2013, following an extended royalty dispute with Hasbro regarding underpaid royalties across the Super Soaker and Nerf product lines, Johnson was awarded nearly $73 million in an arbitration settlement. Rather than retiring, Johnson redirected his substantial earnings into his lifelong scientific interest: independent energy research.
Operating out of Johnson Research & Development in Atlanta, Georgia, Johnson turned his focus toward pressing global energy dilemmas. He spearheaded the development of the Johnson Thermoelectric Energy Converter (JTEC), an advanced thermodynamic engine designed to convert heat directly into electrical energy using electro-chemical hydrogen expansion without moving mechanical parts. He also established research facilities to develop advanced solid-state lithium battery technologies. In 2022, Lonnie Johnson was formally inducted into the National Inventors Hall of Fame, recognizing a career that bridged deep-space aerospace engineering, global toy culture, and next-generation green energy.
Key takeaways
•Lonnie Johnson conceived the Super Soaker in 1982 while working at NASA's Jet Propulsion Laboratory, discovering the propulsion concept while experimenting with an eco-friendly heat pump that used water instead of Freon.
•The core innovation replaced low-powered finger-pump squirt mechanisms with stored pneumatic pressure, using a manual pump to compress air inside a water reservoir before firing.
•After seven years of rejections, Johnson secured a licensing deal with Larami Corporation in 1989 by demonstrating a working prototype inside a corporate boardroom.
•Johnson reinvested his commercial toy royalties into clean energy innovation, founding research initiatives for solid-state batteries and advanced thermoelectric converters.