the polk dr1 i have flies great. it has an eflite 15 motor with a 40 amp esc, and an eflite 2100mah lipo battery. needed alot of weight up front. i think around 10 ounces. flies very smooth and has no bad characteristics. even bought a second one, but it's going to be powered by an o.s. 15. the polk dr1 is a great inexpensive, easy to build kit.