So-Cal Bash time!..

[rawfuls]

Haha.
Coaxials (Dual blades, two on bottom, and two on top. No tail motor)
Example: Lama V4; Blade mCX; Blade CX1/2/3

FP = Fixed Pitch (Much less complex than a CP [Collective Pitch] head, which means easier to fix, but much harder to learn how to fly.. Once you learn to fly a FP, rumor has it that you can fly anything)
Examples: ESky Honey Bee Fixed Pitch

CP = Collective Pitch (Inverted, you can't do this with an FP heli)
Much more complex head, but you can do inverted!
Examples: Belt CP, ESky HoneyBee CP

Get it? Not really?
Ehh

I know, way off topic, whatever :P