Hi gramps2361. Thanks for your thought. What nice is the original design of the U.S UCAV X-47B. It is a remarkable design. The original design does not has winglets (vertical stabilizer at wings' tips), I have tried to fly the black diamond, made from paper glider, and it does not fly stable. Therefore I decided to design the black diamond with vertical stabilizers at wings' tips.
LOL indeed. That day when I flew the sport trainer, it was going to rain; and the presence of an army of dragonfly shows the sign
. Sometimes the dragonflies flew past the video camera and the camera adjusts autofocus on the dragonflies; ruining the quality of the flying model.
Speaking of dragonfly, I am going on a new project to design model with wings sort of similar to dragonfly. Like a Bi-plane with large wing surface area and high lift to carry FPV gears and complete autopilot module. The FPV camera should be mounted on the top of the cockpit, and another HD camera (for HD recording, GoPro cam) attached to the belly of the model; probably with a pan and tilt mechanism. The draft design looks something like this:
I hope this design is also efficient for long period flying