|Mar 26, 2014, 08:34 PM|
Joined Dec 2013
This thread explores wing fold.
Fold is defined as a retraction of the wing laterally along the horizontal plane and occurs perpendicular to the flap axis.
Fold is present in all vertebrate natural models. http://arthropter.blogspot.com/
Why aren't we doing this?
Examples of man-made wings that fold?
What are the benefits of fold?
What are the costs of fold?
When is the wing folded?
-wing retracted for upstroke
-wing extended for downstroke
-gliding (no flap) extended and retracted for control
Examples of biological wings that fold:
|Oct 21, 2014, 07:32 AM|
Joined Oct 2014
im as well thinking about the folding possibilities
making the wingarea as small as possible one upstroke to save energy is one point
another point is the form of the vortex if you look at this paper http://www.google.de/url?sa=t&rct=j&...,d.bGQ&cad=rja
you will see that there is a relation between the flapping and the vortex shape
Examples of man-made wings that fold? there are some examples ...
http://eutytoalba.deviantart.com/art...IDEO-377858529 (maybe just fun, but interesting)
this one is maybe interesting, because some bats (esp. fast flight) and many birds do this kind of folding motion during fast flight.
there are some more examples like telescopic contractible wing
i as well observed that birds and bats (
in my oppinion an interesting technical realization would be to roll the wing partially up and out before downstroke or to pivot the whole wing back and forward
problem is the technical solution for this problem, it is not as simple as the existing ornithopter flapping mechanism and 4bar linkage gears (sorry for step on someones toes ...)
|Oct 21, 2014, 12:29 PM|
Joined Aug 2014
Pterosaur wing folding doesn't comply with what is called out in arthropter blogspot. Also, they can't hyperextend their ankles into the position shown.. Ankles will only extend to about 165 degrees.
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