Simple and compact aviation kneeboard. The pen holder clips on the side at the top. Tested with 3M 4x6 post-it notes. Works best with pens with a rubber grip. Hook & loop (velcro) or elastic strap is required to fasten it to your leg.
Update Dec 14, 2025: New file with optimized dimensions for 3M notepads. 0.3 mm longer, 1 mm diameter reliefs at inside corners.
The author marked this model as their own original creation.