These designs are without vertical tail very unstable, so most designs have a vertical tail. Fauvel, a French designer, became famous with his unswept designs. Therefore they are the most compact version of a flying wing. You gotta do a LOT of math to figure it out. Designs using auto stable airfoils also called unswept flying wings These designs use an airfoil, which doesn't require a sweep. At which AoA the airfoil should operate at a given CL is determined almost completely by camber (2D case) When the flying wing is cruising, the lift force needs to equal the weight, but does the flying wing cruise at 0 AOA or can it cruise at 3 of AOA so it can keep its. The big factors are sweep and taper more sweep means that the lifting tendency will be more important, and more taper means that the pitching moment tendency will be more important. You should find an airfoil which provided minimum drag at this flying CL. Take your time and try to keep both sides symmetrical. Use the cross-section diagrams as a guide for shaping. The question of which tendency wins out is tricky. With the emery board, sandpaper, or metal file, shape the upper surface of the Flying Wing into an airfoil. In this concept, wide airfoil-shaped body is. It will also try to pitch the plane down because there will be lower lift in the front, HOWEVER that can be remedied by building the root section at a higher AoA than the tip section. This configuration incorporates design features from conventional fuselage as well as traditional flying wing. Increasing reflex in the root area will pitch the plane up due to the higher pitching moment of the airfoil there. It also influences overall pitching by virtue of all the lift it's creating ahead of the CG. A new delta-wing aircraft wherein airflow effectively alters geometry with airspeed to produce high lift at low speed and lowinduced drag at high speed. The YB-49 featured a flying wing design and was a turbojet -powered development of the earlier, piston-engined Northrop XB-35 and YB-35. If the wing is tapered, the root (inboard) section has the largest influence on the craft's overall pitching moment due to the airfoil. The Northrop YB-49 was an American prototype jet-powered heavy bomber developed by Northrop Corporation shortly after World War II for service with the United States Air Force. By the way, for the part of the wing that's inboard of the MAC, you generally don't want reflex - discussed in-depth in various threads on this site, if you're interested why this is so. Reflex airfoils do it all by themselves and unswept flying wings do not need washout, but a proper reflex airfoil.
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