Hi, if you to SPAD to The bone .com , you will see planes made of sign post plastic material called aircore. Some of these planes have flat wings called Stop Signs and Pizza Box . They are fairly good flyers. You may get some good ideas, RCU has some forums on SPAD airplanes that may help also. Easy material to work with and a lot cheaper than balsa.Remenber the .049 planes for U-Control years ago ? They mostly used flat wings and flew good. I have been toying with these planes for a while, once you get a good design you are going to have a lot of fun. Watch you center of gravity closely to make a good flyer. Have fun let me know how it works out for you. Thanks Dan