Tag Archives: drag

Customer asks a good prop question with implications…..

Hi Dave, Quick question about the APC props. I note that for multi-rotor the sizes seem to be with 4.5 pitch. Is there a reason why I should not use say, 9×6 with 9x6R for multi rotor craft? Thanks David … Continue reading

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Flow Visualization

Did you ever wonder how the aerodynamic (fluid dynamic) principles were worked out in order to produce the high performance airplanes of the 50’s and 60’s were developed before the advent of computer flow models? Some of those aircraft sill … Continue reading

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The Fluid Dynamics Of Drag Part II

What has less drag, a smooth surface or one with imperfections such as rivit heads or seams?

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Fluid Dymanics of Drag – Boundary Layers

Excellent video showing in real experiments you can understand and see. Shows what the boundary layer is, what a stall looks like (if you could see the air) and vorticity. EXCELLENT! Part 1: Part 2: Notice also as the airfoil … Continue reading

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The Fluid Dynamics Of Drag

Excellent video from days of old that demonstrate some very important aerodynamic principles.  The different drag produced by common objects is shown on a scale. You’ll be amazed.

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