Factor for Downspring Hingemoment due to Squared Elevator (and/or Canardvator) Deflection

In an aircraft with elevator control or elevator and canardvator control, hingemoment is from downspring as a result of the square of elevator deflection.

In an aircraft with canardvator control only, hingemoment is from downspring as a result of the square of canardvator deflection.

The hingemoment due to the downspring is calculated at various pitch control surface deflections and tail incidence angles. Curves are fit through these data points with a second order trendline in the following form:

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Note:

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is uniquely determined from the aircraft control system.