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So any news about the low-noise propellers for the spark?
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<blockquote data-quote="cozzykim" data-source="post: 57653" data-attributes="member: 6499"><p>They can't produce their own lift, (or very little, as they're almost vertical), what they do is improve the lift/drag coefficient of the main aerofoil surface by reducing drag and vortex turbulence at the end of the wing where air would normally 'fall over' the end of a flat wing from the high pressure underside to the low pressure upper side, producing the vortices as the wing moves forward.</p><p></p><p>Birds have similar devices, eagles and such have winglets (feathers) that lift up at the ends, and some birds have feathers on the upper side of the wing that lift when there's a risk of very low pressure forming a cavity or vortex.</p></blockquote><p></p>
[QUOTE="cozzykim, post: 57653, member: 6499"] They can't produce their own lift, (or very little, as they're almost vertical), what they do is improve the lift/drag coefficient of the main aerofoil surface by reducing drag and vortex turbulence at the end of the wing where air would normally 'fall over' the end of a flat wing from the high pressure underside to the low pressure upper side, producing the vortices as the wing moves forward. Birds have similar devices, eagles and such have winglets (feathers) that lift up at the ends, and some birds have feathers on the upper side of the wing that lift when there's a risk of very low pressure forming a cavity or vortex. [/QUOTE]
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So any news about the low-noise propellers for the spark?