Bogging is a condition where the main rotor speed drops due to increased loading, such as applying a large amount of collective pitch (especailly to stop a rapid descent). Bogging is especially common on electric helicopters as when the motor makes large current demands on the battery, its Voltage drops under load, limiting the maximum motor speed possible. Bogging is usually a symptom of either an underpowered model, or poor collective management. Bogging is sometimes accompanied by a sound known as "blade farting", "chuffing" or "woofing", as the airfoil partially stalls.
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