A few months ago I recieved an email from Lorenz, main developer of the Pixhawk research project and the PX4 autopilot. He urged me to create a small flying wing platform. Around 35 inch wing span and around 500 grams. capable of carrying a small camera like a gopro or canon s100.camera and an autopilot. I thought it sounded like an excellent idea. I could make it very portable and it could operate out of much more confined spaces then the techpod.
So I got to work. After about 4 weeks of analyzing airfoils and reiterating designs I finally came up with this wing set up.
I cut the wings out of EPP with a 4 axis hotwire CNC machine. I glued the sections together with goop and covered it with laminate material. I made some balsa elevons and vertical stabs. It came out to be 20 oz which is a little over the target weight but this is a prototype and a fully molded EPO version will be much lighter. I put a couple small holes in the bottom so it could be easily launched two finger style. hear is the video from the flight.
other than the roll trim being out a bit with it pulling to the left, the launch went very well. a little bit of left trim and it was flying flat and level. there are a couple obvious changes i need to make. one is I need to move the motor down to center with the wing. The other is to turn down the throws. It was pretty twitchy but I usually set up the first flight with a lot of throw. I put it into a few stalls and it takes a good two revolutions to recover from a spin but I think that is to be expected from a wing. I had a blast flying it and it can take a hard landing. I will be putting an apm in it and I should have much more flight performance data.
you can read more about the techwing and the techpod at hobbyuav.com