Over the last week I completed doing the fiberglass layup for the 3rd and 4th propeller.  Cutting the cores and doing the fiberglass layup for the propellers was one of the biggest parts of the project and it's good to have it out of the way.  The propellers all just need some sanding primer and paint and they'll be ready to start hover testing.  From left to right are propellers 1-4.

The last part needed for mounting the propellers are the crush plates.  These will distribute the force from the bolts around the propeller hub.  I created the CAD, machine code and cut four copies out of 1/8" thick birch plywood.

All the files for the crush plates have been uploaded to the github repository.  I'll be uploading my entry video for The Hackaday Prize in the next day or two and getting everything else ready for the first hover test.