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Energy considerations in aviation: How realistic are alternative energy forms?

Aerotime

Put in simpler terms: The thrust needed for a plane to fly is dependent on the planes overall mass during the acceleration phase, its speed, the air density, which differs with the altitude and several other factors. Promise: No more physics formulas in this text from now on.)

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Horizon Aircraft is developing the first 800km range hybrid eVTOL aircraft  

Aerotime

This allows air to be drawn through the top of the fan and expelled out through the bottom in the form of downward thrust. Once airborne, the aircraft relies on a conventional rear-mounted propeller to provide forward thrust, while the panels that cover the wing-mounted fans return to their fully closed position.

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Kratos successfully demonstrates trolley takeoff for XQ-58 Valkyrie UCAV

Aerotime

The KTLS is an unpowered system, with takeoff thrust provided solely by the aircraft’s jet engine. During the fully autonomous takeoff, the Valkyrie engine throttles up like a conventional jet, accelerating down the runway with the KTLS.

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Ranked: Top 10 fastest fighter jets in the world in 2025

Aerotime

Known as the Flogger, the MiG-23s variable wing sweep makes it capable of taking off from short, remote runways, as well as optimizing its aerodynamic profile for supersonic or cruise flight. Nevertheless, it was an extremely sophisticated jet for the late 60s and remains one of the most iconic Soviet aircraft of the Cold War.

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