Agile Humpback Whale Flipper Design

Aircraft designers take not in article "Flighty Flippers" in 'Creation' magazinen Vol, 27 No. 2 by Jonathan Sarfati.

'Ever seen the bumps on the front of a humpback whale's flipper? What sort of designer would design such a thing, rather than a smooth, sleek flipper?'

'Engineers and US Naval Academy scientists have inadvertently answered that question: an incredibly ingenious designer - one whom aircraft designers can learn much from!'

'They used scale models of a flipper 56 cm (22") long. One was smooth, and the other had the little bumps, called tubercles. In a wind tunnel, the smooth one behaved like a typical aeroplane wing. But the one with the tubercles had 8% better lift and an astounding 32% less drag. It also resisted stalling at a 40% steeper wing angle.

If that could be applied to aeroplanes, the better lift would make takeoff and landing easier; and lower drag would mean less fuel would be wasted; and the better stall resistance would be a huge safety advantage. The researchers propose that the tubercle design would also greatly benefit propellers, helicopter rotors and ship rudders............ '

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