Leading edge vortex stably attached near the base of a freely flying maple seed Acer pseudo-platanus
Sign in to YouTube
Sign in to YouTube
Sign in to YouTube
Uploaded on Jun 15, 2009
Supporting Online Material for "Leading-Edge Vortices Elevate Lift of Autorotating Plant Seeds," D. Lentink, W.B. Dickson, J.L. van Leeuwen and M.H. Dickinson, Science 12 June 2009: Vol. 324. no. 5933, pp. 1438 - 1440 http://dx.doi.org/10.1126/science.117...
Abstract: "As they descend, the autorotating seeds of maples and some other trees generate unexpectedly high lift, but how they attain this elevated performance is unknown. To elucidate the mechanisms responsible, we measured the three-dimensional flow around dynamically scaled models of maple and hornbeam seeds. Our results indicate that these seeds attain high lift by generating a stable leading-edge vortex (LEV) as they descend. The compact LEV, which we verified on real specimens, allows maple seeds to remain in the air more effectively than do a variety of nonautorotating seeds. LEVs also explain the high lift generated by hovering insects, bats, and possibly birds, suggesting that the use of LEVs represents a convergent aerodynamic solution in the evolution of flight performance in both animals and plants."
Explanation "The movie shows a leading edge vortex that is stably attached near the base of a freely flying maple seed (Acer pseudo-platanus L.). The seed is spinning at stationary height in a vertical wind tunnel and the flow is visualized at different spanwise stations using a laser light sheet. The laser light sheet illuminates the motion of smoke particles dispersed in the air around the wing that trace the airflow. The seed has a small horizontal speed and, therefore, the seed flies slowly out of the laser sheet. As a result the local airflow is visualized at successively more outward spanwise stations of the spinning seed."
See http://www.sciencemag.org/cgi/data/32... for further details and explanation of key frames.
-
Category
-
License
Standard YouTube License
Loading...
Loading...
Loading...
Loading...
-
5:52
24" Boundary Layer Tesla Turbineby ThrustcycleFeatured
26,177
-
6:38
Worlds first controllable robotic samara monocopter MAV, University of Maryland's Ulrich flyerby RoboSeed
192,254 views
-
2:16
Maple Coptersby kdwpinfo
4,223 views
-
6:31
Directly Downwind Faster than the Wind on Discovery Channelby piratewoodleg
12,889 views
-
1:38
Lockheed Martin 30cm-span Samarai 'maple seed' UAVby theworacle
226,553 views
-
5:01
Ancient Egyptian Planesby sparkleystitch
23,480 views
-
3:10
Fly Cycle Guideby DarkmaneTheWerewolf
33,085 views
-
2:39
World's first controllable MAV monocopter, Robotic Samara (maple seed)by RoboSeed
97,689 views
-
1:45
EFFY R-S2O Y1 Paper airplane Test Flight movieby AriazeAW
334,741 views
-
2:09
Ink Flow Visualization on Wing Surfaceby NASA Langley CRGIS
2,811 views
-
0:37
Dragonfly action in slow motionby ValeVids
49,574 views
-
6:23
Germinating Japanese Maple Seedsby Ken Alston
47,555 views
-
3:09
BAT SENSE - by Nature Videoby nature video
397,636 views
-
0:51
NASA Quiet Short-Haul Research Aircraft (QSRA) Carrier Trialsby jaglavaksoldier
246,700 views
-
1:49
Buzzz another bee taking flight in UltraSlo slow motionby ultraslo
44,618 views
-
0:36
Boeing 747 Wing Tip Vortex Testby ZeroScam
231,115 views
-
1:33
Time Warp: Chicken vs. Propellerby DiscoveryTV
26,208 views
-
4:07
birds flying at 240fps slow motion - grace and beautyby JCVdude
55,491 views
-
0:44
Flying a CX2 with thousands of Maple seed helisby checkdatvid
3,901 views
-
5:16
Hyperactive Ross and his Maple Candiesby yourrandom
230,053 views
- Loading more suggestions...
Report a comment
All Comments (2)
hectorleon 3 years ago
nice!
Sign in to YouTube
Sign in to YouTube