Hallo!!
Trying to figure out how to fold the wings on some bat-wing people in a project I’m doing and @fantasy-anatomy-analyst said you could help. If you have any pls could you share images and/or diagrams of folded bay wings.
I do apologize on the delay in responding, I've been busy with IRL stuff. You did come to the right place, though. Bat wings work differently from bird wings--basically birds fly with their whole arms while bats use their hands (hence their scientific name, Chiroptera--literally hand wing). This means that that they move differently, as you can see in the following diagram:
image description: a simple diagram showing the different skeletal structures of a generic bat wing vs a generic bird wing image source: University of California Museum of Paleontology, Understanding Evolution, www.understandingevolution.org
The National Park Service has a page on how bats fly that has a diagram comparing a bat wing to a human arm, plus videos on bat flight: https://www.nps.gov/subjects/bats/how-bats-fly.htm
ResearchGate has a few diagrams of bats in flight of varying usefulness to what you: *https://www.researchgate.net/figure/Schematic-of-bat-in-flight-illustrating-aerodynamic-terms-and-concepts-A-Lateral-view_fig1_233835828 *https://www.researchgate.net/figure/The-wingbeat-of-the-long-eared-bat-Plecotus-auritus-illustrating-an-inclined-stroke_fig2_254560995 *https://www.researchgate.net/figure/Full-3D-motion-of-the-bat-wings-the-values-of-the-expansion-coefficients-and-the_fig3_251288251
Brown University News on a bat landing upside down (diagrams and a video): https://news.brown.edu/articles/2015/11/batflip
Current Biology article with a series of pictures of bats of different species: https://www.cell.com/current-biology/fulltext/S0960-9822(15)00415-7
Bats roost in different ways depending on species, and how they fold their wings while they roost differs too. The most common style is by wrapping their wings around them (and possibly also their mates and offspring). And probably the best method for your bat-people, in my opinion (though I'm sure you could get some of the other methods a try, if you wanted, some bats have suction cups on their wings):
image description: a flying fox sleeping upside down with its wings wrapped around it, with green leaves in the background. Its feet are hooked around a piece of rope. image source: NobbiP, via wikipedia
That should be a good start...don't be afraid to ask if you need more, and let me know if there's any particular species you want to look at, wing shapes vary a bit species from species (and not all species have thumbs).
