Lets start off with the CC/CCW, shall we?
Motors produce torque on the airframe. For rotorcraft, the motor axis is pointing up, so once it gets free of the ground, the airframe want's to spin around the motor shaft -- I know, basic physics. On helicopters they counter that torque typically with a tail rotor, but an interesting class of rotorcraft is the "coaxial" -- it has two counter rotating (spinning opposite directions) blades, both typically generating the same-but-opposite torque canceling out any spin from motor torque. What's interesting about this, is you can change the speed of one motor relative to the other and it will give you control in yaw -- the direction you're pointing.
Now let's double the number of blades (to 4 sets) and move them out from underneath each other -- we now have a quad copter. As long as the frame remains rigid, the torque doesn't have to be on top of each other, just parallel to each other. That means every other motor will need to have an opposite rotation to cancel their torque, and the control board will speed up/slow down the motors in pairs to change the motion in yaw.
Now for your purchased motor, a 2000g airframe might be asking a bit much. It will fly, but you'll probably be running higher on the throttle than you like -- keep in mind, it's that margin between hover throttle and WOT(Wide Open Throttle) that your control board uses to maintain stability.
The HK page recommends a 10x5 or 10x4.7 (not a tremendous difference between them), and gives a measured max thrust under 750g. That's low -- you really want to shoot for 1/2 AUW (All Up Weight) per motor, because in a hard yaw, quads *will* balance on the lift of two motors. Effectively, a set of those motors will loose altitude in yaw.
Can you just go with a bigger prop? Yes, but I wouldn't recommend it. First, it'll drive the WOT current up, for which the recommended prop is already up to the limit, and at the price of these motors, I wouldn't push limits. Second, Moving up from a 10x4.7 to a 10x5 you *loose* thrust -- the 10x4.7 is already at or beyond peak efficiency. I doubt moving further up or down in prop size will do any better. Third, normally I'd say quads don't spend much time at WOT so it's not that critical, but *even if* you got more thrust out of a bigger prop, this motor probably will run far too close to WOT with that load.
Would this work for a 2kg hex? absolutely. quad? barely, and you probably won't like it.
So you've already bought those motors -- what now?!? Loose weight. Don't have enough info to help you know how, but for that motor I'd recommend loosing *at least* 500g from your AUW. Otherwise, either buy a motor set with more thrust or buy another pair + booms and convert to a hex.
BTW, Welcome to the Forum!
)
