downstroke
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	The powered downstroke is achieved by the pilot pushing down the wing beat lever with her/his feet During the downstroke, the increased lift generated by the wings causes the wing incidence bar to tilt into a negative angle of incidence, against the incidence spring tension. (The pivot of the wing incidence bar lies in front of the centre of lift of the wings.)
	The amplitude of the downstroke is limited by the piston reaching the bottom of the wing beat control cylinder

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