The humpback whale (Megaptera novaeangliae) is exceptional among the baleen whales in its ability to undertake acrobatic underwater maneuvers to catch prey. In order to execute these banking and turning maneuvers, humpback whales utilize extremely mobile flippers. The humpback whale flipper is unique because of the presence of large protuberances or tubercles located on the leading edge which gives this surface a scalloped appearance. We show, through wind tunnel measurements, that the addition of leading-edge tubercles to a scale model of an idealized humpback whale flipper delays the stall angle by approximately 40%, while increasing lift and decreasing drag.

1.
C. M.
Jurasz
and
V. P.
Jurasz
, “
Feeding modes of the humpback whale, Megaptera novaeangliae, in southeast Alaska
,”
Sci. Rep. Whale Res. Inst.
31
,
69
(
1979
).
2.
J. H. W.
Hain
,
G. R.
Carter
,
S. D.
Kraus
,
C. A.
Mayo
, and
H. E.
Winn
, “
Feeding-behavior of the humpback whale, Megaptera-Novaeangliae, in the western North-Atlantic
,”
Fish. Bull. NOAA
80
,
259
(
1982
).
3.
U. M. Norberg, Vertebrate Flight: Mechanics, Physiology, Morphology, Ecology and Evolution (Springer-Verlag, Berlin, 1990).
4.
H. D. Taylor, “Summary report on vortex generators,” United Aircraft Research Department Report R-05280-9 (1950).
5.
D. M.
Bushnell
and
K. J.
Moore
, “
Drag reduction in nature
,”
Annu. Rev. Fluid Mech.
23
,
65
(
1991
).
6.
F. E.
Fish
and
J. M.
Battle
, “
Hydrodynamic design of the humpback whale flipper
,”
J. Morphol.
225
,
51
(
1995
).
7.
D. S. Miklosovic, M. P. Schultz, and C. J. Esquivel, “Effects of surface finish on aerodynamics performance of a representative stabilizer,” J. Aircr. (to be published).
8.
J. D. Anderson, Fundamentals of Aerodynamics Third Edition (McGraw-Hill, Boston, 2001).
9.
I. H. Abbott and A. E. Von Doenhoff, Theory of Wing Sections, Including a Summary of Airfoil Data (Dover, New York, 1959).
10.
D.
Weihs
, “
Stability of aquatic animal locomotion
,”
Cont. Math.
141
,
433
(
1993
).
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