That design is a variation on the Wright Bat. Note, plastic blades are NOT allowed in the national rules. But there are a lot of other ways to get there. If built to minimum weight and max rotor size it should fly well.For those who want helicopter design/idea
http://www.illinoisolympiad.org/iso/fil ... copter.pdf
What's the rotor size on your copter? What's your weight? Shouldn't need to spin fast to lift a 4.0 gm copter with 40 cm span rotor. Note, that's as big as a Wright Stuff Wing that has to lift 7.0 gms! You shouldn't need a lot of speed to lift your copter. But just like Wright Stuff, in helicopter you need to maximize your rotor and minimize your weight for good flights. My slightly under weight prototype with two 40 cm rotors spins so slow you can count the revolutions by eye.
For a hovering copter, there is no real difference between a rotor and a propeller, this is one of those arbitrary differences that engineers sometimes make for their own convenience. Note, a copter that moves horizontally MAY want a rotor designed different than a prop, as you need to take that horizontal motion of the air past the rotor into account. That may be where the terms differentiated for the convenience of designers.i'm not sure if anyone asked this already, but is there a specific reason why helicopters use rotors not propellers?(and vice versa) <---this face looks cool