NASA Mars Helicopter Ingenuity

If you can't wait to build your own Ingenuity Helicopter model, I have created free step-by-step instructions that are available for download at Rebrickable.  The site also includes a 3D model file, an inventory of the parts, and other useful links.  

You can see how the crank and rotors function on my brick-built Ingenuity model among additional helicopter images on Flickr or in the short video below.

https://youtu.be/wD2Yf70VIpM