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Also your ESCs can't get too high of an amperage rating, but those would be pretty heavy for a motor than can only draw 8 amps. Is this a 250mm frame?

7.6a? How many KV?

The multiwii is nice, but if you want to do many custom things you can really drag down that Atmel processor. probably best to use a little nano or UNO for most additions, and have the FCB like a slave.

I suggest you get both, getting everything setup for a multiwii (I'd strongly suggest you get the APM instead) is a heard task as you may have hardware problems and unforeseen problems.

Be sure to post some flight time test hahaha.

Unless you are buying those newer LiHV batteries from HK that may or may not contain traces of graphene.

@Mike H.

Not that I know of for quadcopters as the drag depends in the frame's shape and style. I imagine that you could find out the drag using a traditional equation(D = Cd * A * .5 * r * V^2) provided you are able to calculate the reference area of whichever frame you are using.

Is english a second language for you? Can you try to reword that last sentence?

That is a common setup, find some PIDs that others have used on similar hardware and go with them. Then as you learn you can tweak them.

Do you have any mixing on in your Radio's settings? For delta wings you need mixing like this, but quadcopters do not.

What type of budget do you have for a screen?

Check that the channel inputs are set as such.

Not the loops, just the settings.

Yeah, could create problems down the road. I was just listing kinda bodges/possibilities.

You probably could if you could make sure they were flashed with the exact same firmware, but it is certainly not recommended. If you are forced to mix them place brand A on CW and brand B on CCW motors to make flipping on takeoff less likely if they started up at different times.

Just on the axis that you problem is occurring. Usually on a quadcopter the Roll and pitch are linked.

High frequency oscillation that remain the same are P being too high, lower frequency oscillations that may get worse over time are I.

Hahahahaha, so are you setting up a FCB or trying to get a DIY FCB together?

If you want to you can repair the ESCs with a soldering iron and some spare/cheap transistors, but it would probably be a bit easier to buy newer ESC(s).