American C—130J Hercules transporters may have strange fins on their tails. The US Air Force, more specifically the Special Operations Command (AFSOC), has begun testing thin keel plates developed by Vortex Control Technologies. They look like small aerodynamic "ears" — but, according to the idea, they should seriously improve the characteristics of the aircraft.
What does this mean? The main goal is to reduce fuel consumption and increase flight range. The plates work according to the principle of controlling air vortices in the tail section of the aircraft — they "smooth out" the flow, reduce turbulence and, as a result, reduce aerodynamic drag.
For C-130J-type transporters, who often fly with heavy loads, at the limit of their capabilities and without fuel reserves, even a small gain in efficiency is already a victory. We may be talking about percentages, but on the scale of a fleet and long—term operation, this means millions of dollars in savings.
Plus, the increased range is especially important for special forces: they often need to fly far, quietly and without refueling. Any improvement is a direct bonus in survival and mission flexibility.
The best part is that the system is cheap and easy to install. No alterations to the engine or fuselage. They just screwed on the plates and flew on, spending less.
If the tests are successful, the entire C-130J fleet can be equipped with such "fins". And who would have thought — the future of fuel economy does not start with a new engine, but with small parts on the tail.
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