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Old Aug 29, 2014, 11:51 AM
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Had it not been for the Chicxsulub impact, the azdharchid pterosaurs would still be here. They were the most powerful flappers that ever lived, and substantially better at soaring than albatrosses. What they didn't have, was large fat stores. A month without soaring conditions, and they are gone. In the attached photo of a left humerus, note the huge deltopectoral crest that is used to provide extra attachment area and leverage for the flapping muscles.

Pterosaurs also have the elbow driven r/u translation articulation that drives the wrist, though it doesn't operate the same way it does in birds.

The pteroid articulation is critical to both propatagium camber control and to flutter control, but it is usually illustrated wrong in the literature. The fovea (socket) that is usually shown mounting the pteroid actually mounts sesimoid 'A' instead. Sesimoid 'A' faciliates the operation of the tendon that modulates the wing pitch outboard of the wrist during flapping and in response to gusts. The pteroid actually mounts in a cartiledge capsule on the inboard face of the ADC.
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Last edited by JimC3; Aug 29, 2014 at 12:14 PM.
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Old Sep 03, 2014, 12:37 PM
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It is worth noting that pterosaurs do not flap in the same way that birds do and do not have any articulation capable of creating significant wingtip dip outboard of the shoulder. They ain't birds. The nearest approximation they have is to use the pitch articulation between the distal carpal and the 4th metacarpal to take advantage of the aftward curve in the wing finger caused by membrane tension and use that to twist the tip down. A 5 meter span Quetzalcoatlus species can use this articulation to dip the tip by 2.5 cm (1 inch).
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Old Sep 16, 2014, 06:13 PM
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Smart bionic robot that flies like a bird University of Technoloy Twente Oversijssel Netherlands (4 min 1 sec)
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Old Sep 16, 2014, 07:38 PM
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Nice Strouhal Number
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Old Sep 17, 2014, 09:05 PM
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Мy festo bird сlone is still in progress (1 min 10 sec)


Automata : Flying Bird (1 min 22 sec)
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Last edited by ZTEX; Sep 17, 2014 at 09:30 PM.
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Old Sep 18, 2014, 09:11 AM
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Several years ago, Khaled posted an interesting sketch that gave a vertical midwing articulation during the wingbeat. All you have to do to add in a sweep and/or twist component is cock the hingepin.
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Old Sep 19, 2014, 03:59 AM
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Quote:
Originally Posted by JimC3 View Post
Several years ago, Khaled posted an interesting sketch that gave a vertical midwing articulation during the wingbeat. All you have to do to add in a sweep and/or twist component is cock the hingepin.
http://velkovelkov.blogspot.com/2009...nithopter.html
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Old Sep 19, 2014, 08:31 AM
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Good video for observing 3D articulation
Peregrine Falcon Slow Motion In Flight shot on Phantom HD Gold - 3 Shots (1 min 58 sec)
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