In a conventional aircraft, the horizontal tail acts as a counterweight to provide longitudinal stability. However, that tail also creates "parasitic drag" and adds extra weight to the airframe.
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Nickel and Wohlfahrt categorize the difficulties into three main areas: In a conventional aircraft, the horizontal tail acts
The "practice" section of any good PDF reminds us that theoretical stability margins are often too optimistic. Practical issues like servo lag, sensor noise, and structural flex make tailless flight a control systems challenge as much as an aerodynamic one. In a conventional aircraft