I now have about 24 flights using my new Hobbywing Skywalker 40A ESC. I have tested it at the field with the DYS BE 2208/7 2600 Kv and Grayson SMJV2 motors both with the Master Airscrew 6x4x3 prop.
Both these motor and prop combos pull about 29 amps at full throttle during static bench tests. I ran these setups using my two Mig-35Bs below so that airflow and cooling would be identical.
The ESC delivers power to the motor smoothly and efficiently, no hesitation or skipping, I had it at low setting during all flights. I have "punished" it with lots of rapid throttle movement up and down the throttle spectrum and it has delivered without problem every time thus far.
The internal battery elimination circuit (BEC) works very well. I flew some high alpha several times where all 6 servos were engaged simultaneously for elevons, spoilerons and rudders while the motor was running at about half throttle. No loss of power or response to the servos or the motor while all six servos were working.
Heat build up
This is an area that has me concerned already with this ESC. All the flights I have flown thus far have been in conditions between 8-11 C/46-52 F, so heat build up should not be an issue I wouldn't think, but each time I check it immediately after landing, the ESC is very warm, to the point that after trying to hold my finger on it for 5 seconds, I have to stop as the heat is too much.
So this is a bit puzzling and disappointing to me, I took a couple of pictures of the Hobbywing and Turnigy 40A ESCs side by side to compare the size of the heat sinks on each. I know it is a bit hard to tell in the picture on the left, but the heat sinks are about the same thickness. In the picture on the right, the labels on each ESC cover the heat sink, so in fact the heat sink on the Hobbywing ESC has a larger surface area, yet runs quite a bit hotter than the Turnigy Plush with the same amp draw.
So I will continue to test and fly with this ESC, I will probably pair it with a Turnigy D2826/6 2200 Kv motor and MA 6x4x3 prop combo for awhile as that setup draws only about 26 amps and see how that performs.