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SIFT Study Guide with Accurate Solutions

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SIFT Study Guide with Accurate Solutions

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SIFT Study Guide with Accurate
Solutions

what is lift? - ANS-difference in air pressure

how does a helicopter generate lift? - ANS-Reduced pressure above the airfoil pushes it
downward.
pressure below pushes upward.
air pressure is greater below the airfoil


what are the three subcategories of Drag? - ANS-parasitic, profile, induced

what is parasitic drag? - ANS-caused by non-lift portions of helicopter (fuselage, landing
gear, etc.)

increases with speed (dominant at high airspeeds)

what is profile drag? - ANS-created by the friction resistance of spinning airfoils.

increases with velocity, but only slightly

remains moderate throughout, not dominant nor negligible

what is induced drag? - ANS-when blades spin, they leave a small gap of air behind
them, creating a vortex pushed in the opposite direction of lift. Pushes helicopter back
as it moves forward

The greater the AOA the greater the induced drag

decreases with airspeed. Dominant force at low speeds

what is the basic empty weight? - ANS-weight when everything unattached in removed

what is max Gross wieght? - ANS-max weight a helicopter can bear safely

what is max internal gross weight - ANS-max weight within the helicopter

what is max external weight - ANS-max weight supported externally by helicopter.

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