January 1911. Tlalpujahua, Michoacán. Deep within the cavernous iron foundries of the “Las Dos Estrellas” mine, a sound never before heard in Latin America shattered the mountain silence. It was a rhythmic, metallic roar—a mechanical heartbeat.

Standing over a contraption of gleaming steel and copper were two teenagers, their faces smeared with grease and coal dust. Juan Pablo Aldasoro, just 17, and his brother Eduardo, 16, watched with bated breath as the needles on their handmade gauges climbed. Two cylinders, horizontally opposed, air-cooled, pushing 60 horsepower at 900 RPMs. It didn’t just work; it sang.

They had done it. Without a single university degree between them, without blueprints from France, and without a cent of government funding, they had built the first aeronautical engine in Latin America.

While Europe was already industrializing the sky and the United States was still importing French technology, these two brothers from Hidalgo were forging a future for a nation that didn’t even have a single military pilot. This is the documented story of how the Aldasoro brothers didn’t just build a motor—they willed the Mexican Air Force into existence.

A Nation in Flames

To understand the magnitude of the Aldasoro achievement, one must look at the backdrop of 1910 Mexico. On November 20th of that year, Francisco I. Madero proclaimed the Plan of San Luis, sparking the Mexican Revolution. It was a brutal, decade-long civil war against the 31-year dictatorship of Porfirio Díaz.

The statistics of the Revolution are staggering: over a million people died—nearly 8% of the total population. In modern terms, that would be as if the United States lost 27 million citizens today.

Yet, as Mexico bled, the rest of the world was looking upward. In 1903, the Wright brothers flew for 12 seconds in North Carolina. By 1911, Italy became the first nation to use aviation in combat in Libya. By 1912, France operated over 200 military aircraft, Germany 180, and Britain 113. Military strategists reached a singular conclusion: He who controls the skies controls the battlefield.

Mexico, however, had zero military planes, zero infrastructure, and zero trained pilots. The country was an industrial desert—except for two brothers from the mining town of Real del Monte.

The Mechanics of Obsession

Juan Pablo (born 1893) and Eduardo (born 1894) were inseparable from birth. Their father, Andrés Aldasoro, was a high-ranking official in the Díaz administration, which gave them access to something more valuable than gold: information.

While other boys played in the streets, the Aldasoros were dismantling clocks to study their escapements and repairing every bicycle in the neighborhood. As teenagers, they became “armchair engineers,” devouring European scientific journals like L’Aérophile. They taught themselves the principles of internal combustion and aerodynamics at a time when “aeronautical engineering” wasn’t even a recognized curriculum in Mexico.

By 1908, they weren’t just reading; they were building. They constructed gliders in their backyard and tested them in the early morning hours in the open plains near the Piedad Cemetery (now Cuauhtémoc Avenue in Mexico City). They wore heavy leather aprons as “armor” because their landings were almost always crashes.

The Flight of March 9, 1909

The year 1909 marked a turning point. They took their most ambitious glider to the outskirts of the city, on a dirt path that is today Querétaro Street in Colonia Roma.

In a display of youthful audacity, they tied the glider to a “White” steam car—the fastest automobile of the era. Eduardo took the wheel of the car, and Juan Pablo climbed into the cockpit of the glider.

As the car accelerated, a massive cloud of dust swallowed the scene. Suddenly, Juan Pablo felt the tail lift. The glider soared 10 meters into the air, hovering above the dust cloud for nearly 500 meters. For a few glorious seconds, a Mexican was truly flying.

But tragedy struck. The release mechanism for the tow cable jammed. As Eduardo slowed the car, the cable pulled the glider backward. The aircraft performed a violent somersault and slammed into the ground, disintegrating into splinters. Juan Pablo emerged with a shattered leg, but his spirit was untouched. He had proven that his designs worked.

“We don’t need a tow car,” Juan Pablo told Eduardo while his leg was still in a cast. “We need our own power.”

The Birth of the Engine

To build an engine, they moved to the “Las Dos Estrellas” mine in Tlalpujahua, Michoacán. They had a singular goal: to create a powerplant specifically for flight.

At the time, automobile engines were far too heavy. They required massive radiators, gallons of coolant, and cast-iron blocks that would never leave the ground. The Aldasoros decided to go a different route: the Aldasoro Engine would be air-cooled, lightweight, and balanced.

They used the mine’s foundries as their laboratory. For months, they hand-cast cylinders, forged crankshafts, and experimented with alloys. They failed dozens of times. Parts warped under heat; valves leaked pressure. But by January 1911, the prototype was ready.

When they cranked the engine for the first time, it didn’t just run—it reached 60 horsepower, a feat that rivaled the best engines coming out of France at the time. They had achieved the impossible: high power-to-weight ratio in a machine built by hand in a country at war.

From Rebels to Pioneers

In 1912, the new Madero government realized that aviation was the key to ending the Revolution. They selected five promising young Mexicans to go to the Moissant Aviation School in New York. Among them were Juan Pablo and Eduardo Aldasoro.

In the United States, they were sensations. Juan Pablo became the first person in history to fly over the Statue of Liberty in a closed-circuit flight. When they returned to Mexico, they were no longer just “hobbyists”; they were world-class aviators.

In 1913, during the “Decena Trágica” (the Ten Tragic Days), they saw the potential for aircraft in reconnaissance. By 1915, they were instrumental in the creation of the Talleres Nacionales de Construcciones Aeronáuticas (TNCA).

The brothers realized that Mexico could not depend on foreign technology. If a part broke, they couldn’t wait three months for a ship from Europe. They began manufacturing entire airplanes—the “Serie A”—powered by their own engines.

By doing this, they effectively founded the Mexican Air Force (FAM). They proved that Mexico could be technologically sovereign.

Why Are They Forgotten?

If the Aldasoro brothers were Americans or French, they would be as famous as the Wrights or Blériot. But history is often written by the victors of the Great War, and Mexico’s Revolution kept the country isolated from the global stage.

The brothers didn’t care for fame. They spent their later years serving their country; Juan Pablo became a General and Eduardo a Colonel. They paved the way for Mexico to become a hub of Latin American aviation, proving that innovation isn’t a matter of university degrees, but of relentless, gritty obsession.

Today, when a Mexican Air Force jet screams across the sky, it carries the DNA of those two teenagers in the Michoacán foundry. They were the boys who looked at a country in chaos and decided that the only way to save it was to give it wings.