I just successfully flight tested the DJI 2312 motors (paired with v2.1 ESCs) on my FC40 with 9443 Props.
I had 9450 props with me, but since I was expecting the fc40 to crash, I didn't mount them on!
I would say, these motors seemed relatively silent to the older ones and ran cooler too!
I just hovered it around the roof of my house as it was quite windy.
Some points :
* Phantom had to fight the winds throughout its hover.
* Time to Red LED warning - ~12 Minutes with stock DJI 2200mah LiPO
* Payload was the FC40 Camera only.
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Had lost the phantom's ESC LED functionality as the Phantom2 board controlled the LEDs on the v2 and 2.1ESCs.
A friend helped code up a IC which emulated the duty cycle for the front arm ESCs. So now, my front arm ESCs are lit up!
I'm still working on the rear arm ESC LEDs and trying to emulate the LED patterns of the main naza LED. As on Phantom 2s.
I will be upgrading the mainboard via the upgrade kit, in order to mount the H3-3D Gimbal and FPV equipment. That weight was the primary reason I upgraded the motors.
Am looking forward to the 4000 or 5200mah batteries to extend the time with all this payload attached!
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Here are some pictures after I had installed the upgrade, closed it up and was testing the motors on my table.
IR images showed motors maintaining a steady temperature while running (no props)
I was surprised to find that even the compass was getting hot as shown in the IR images!
Post 12 min flight, motors had the same temperature of 36degree C.