The KFm6 Wing was an airframe I tried, then forgot, then came back to again with an interest to developing into a usable FPV/UAV flying wing. Presented here are the plans for V1 so you can try it for yourself…
Building the KFm6 Wing
The wing is made up of 5 layers, with an additional 2 over the center section (the top one acting as a hatch).
Cut the wing halves and 8 individual wing layers. The wing halves are joined by a central rectangular piece that creates the “blunt nose” structure. I used spray adhesive to stick the wing layers on but I’m not sure how good it is and I did have to reinforce some of the joints.
After putting on the first layer I decided that the wing needed some reinforcement and added a fiberglass spar. This was then held in place using the next two layers.
The plans purposely don’t show any cutouts for the spar, servos or any gear in the central section as the entire design is intended to be fluid. Cutouts can be made specifically to the suit the gear that you want to use. This may take a little planning if you want to locate thinner components within the layers. Just remember to space FPV gear out to reduce interference.
There really isn’t a lot to this model! The top hatch I hinged at the front and secured at the back using strong magnets. A ply firewall was glued directly to the back of the wing and a Turnigy 2836 1000kv motor attached and turning a 10×8 folding prop (which is over-propping this motor a fair bit).
The wing is deep enough to easily swallow a 2200mah 3-cell lipo and will give decent enough flight times.
The only other thing I did was wrap the leading edge in reinforced tape both to strengthen the leading edge but also to give a nice smooth curved surface for air to flow over.
I should probably add the balance point should be set at around 173mm from the leading edge of the nose. If anything go 10-20mm further forward for the first flight but try not to go much further back!
I only flew this wing a couple of times before moving on to other projects but finding the awesome FPV49 “Project Undead” video by FPVTrond on YouTube made me take another look. As a result I’ve now got a TBS camera bay on order and am planning to modify this wing into a full on FPV platform.
I’m also shifting the design over to Remote Pilot as a potential for a solid UAV platform.
The greatest thing about the KFm6 wing, or airframes based on this airfoil is that it gives you a solid platform to build on and develop into something that works for you. For now though, take a look at the Project Undead video and see if you get hooked too…