Square Flying Wing

So I saw a piece of foam laying around on the ground and it looked like this so i built something like that piece of foam and this is what came out. The wing flies AMAZING. When you think about it, regular planes have, for the most part, straight wings, not angled back wings (unless for certain purposes). This wing just seems to track so straight and flies at quarter throttle no joke! I most likely will be using this wing in place of the mini zephyr I have and will also be using this grayson hobby motor over the blue wonders for wings and planes this size..http://www.graysonhobby.com/catalog/disposablefoamiebrushlesscombosport18aesc-p-940.html

I also came across this video yesterday saying that if you cut the wing tips at an angle, it causes drag so you dont need winglets or anything so I'll probably try that.