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Ultra-compact structure, four small engines, and coaxial rotors transformed the GEN H-4 into one of the most unusual projects in experimental aviation, combining the characteristics of a real helicopter in a manned aircraft of only 70 kg officially recognized by the Guinness World Records.
Recognized by the Guinness World Records, the GEN H-4 was developed by the Japanese Gen Corporation to occupy a rare space within experimental aviation, combining extremely reduced dimensions without abandoning the basic characteristics required of a manned helicopter.
Weighing only 70 kg, with 4-meter rotors and four compact 125 cc engines, the Japanese aircraft gained international projection precisely by condensing traditional vertical flight systems into a much smaller structure than seen in conventional models.
Japanese helicopter entered the Guinness World Records
Although it has an unusual appearance, the model preserves elements present in traditional helicopters, including landing gear, a lift system with rotating blades, and a manned configuration with the pilot seated in the center of the open structure.
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Unlike most aircraft of this type, the GEN H-4 uses coaxial rotors that rotate in opposite directions, a solution that eliminates the need for a tail rotor and helps significantly reduce the overall size of the assembly.
How the coaxial rotors of the GEN H-4 work
To keep the weight down, Gen Corporation adopted four lightweight 125 cc engines, each equipped with two cylinders and powered by regular gasoline, distributing the necessary force to move the rotors without resorting to a larger unit.
According to data recorded by Guinness, the helicopter can reach an altitude of 1,000 meters, achieve up to 90 km/h, and remain airborne for about 30 minutes, numbers that reinforce its profile geared towards experimentation rather than commercial use.
Open structure reduces weight and size of the aircraft
Visually, the GEN H-4 distances itself from the image associated with traditional helicopters, as it dispenses with a closed cabin, robust fuselage, and long tail to concentrate practically the entire structure around the pilot and the main rotors.
This extreme simplification helps explain the weight of only 70 kg, a value considered unusual for a manned aircraft, especially when compared to light helicopters that often exceed hundreds of kilograms even before refueling.
Simplified control system draws attention
In addition to the compact structure, the control system was also simplified and uses commands similar to handlebars, replacing the traditional set formed by cyclic, collective, and pedals normally found in conventional helicopters.
Although the reduced size may seem strange at first glance, the GEN H-4 is a manned aircraft developed to perform vertical flight with one person on board, within the specific category recognized by the Guinness World Records.
Extreme miniaturization became a project differential
More than competing in commercial aviation, the project gained notoriety for demonstrating how far miniaturization can go within aeronautical engineering without compromising the basic principles necessary for controlled vertical flight.
By removing bulky components, adopting coaxial rotors, and distributing power among compact engines, Gen Corporation created a configuration considered unusual even among ultralight and experimental aircraft produced in recent decades.
The Japanese origin of the helicopter reinforces the project’s connection with precision mechanical solutions, while the recognition obtained in the Guinness keeps the GEN H-4 as one of the most curious aircraft ever recorded within this category.
World’s smallest helicopter continues to arouse curiosity
Reduced weight, compact engines, and rotors of only 4 meters have transformed the GEN H-4 into an unusual example of miniaturization applied to aviation, maintaining classic aeronautical principles in a structure radically smaller than that seen in conventional helicopters.
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