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FREE-ELEVATOR FACTOR
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When the elevator is part of the wing, as on a tailless aircraft, and the elevator is free, the lift-curve slope is given by (6.6,46), i. e.
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The factor in parentheses is the free elevator factor F, and normally has a value less than unity. Likewise, when the elevator is part of the tail, the floating angle can be related to a„ viz.
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and the tail lift coefficient is
(6.6,8)
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The effective lift-curve slope is
place of at and a’ in place of a, then all the equations given in Sec. 6.3 hold for tailed aircraft with a free elevator.
