One piece port covers are unwieldly and hard to actuate. This louvered port design makes the cover lower profile and easier to actuate. This reduces the clearance for the landing gear. Plus it looks super deadly.
Louvred port detail
The root of each louvre section as well as the central fixed spar are attached to the hard plastic porthole sleeve that passes through and reinforces the porthole where the vertical thrusting axial pair are mounted. A moving spar is actuated by a servo to open and close the louvre.
Port covers on the top of the UAV wing are open or closed.
Port covers on the bottom of the wing are controlled using the pitch and yaw signals while in VTOL mode, and are closed in forward flight mode. The pitch control in VTOL mode will help accelerate the UAV to the necessary forward flight speed, while maintaining adequate lift and yaw manuevering through vertical thrust vectoring.