Start with a square piece of cardstock or heavy paper.
For hobbyists making scale planes, you can "laminate" paper to act like wood.
Fold the square diagonally from corner to corner both ways to create an "X" crease.
Cut along each crease from the corner toward the center, but stop about an inch before you hit the middle.
Push a pin through all the tips at the center and into the eraser of a pencil. Leave a little wiggle room so it can spin freely. Method 2: Laminated Model Propeller
Are you looking to attach this to a , or just making a standalone toy? Paper Crafts : How to Make a Paper Propeller
Take every other corner tip and bring it to the exact center point. Do not crease these folds; keep them rounded so they catch the air.