We have a NEW new leader of the thrust charts! And significantly cheaper than the #2 spot. And with color options!
This offering from Sunnysky is well built, SUPER thrusty, also amp - thirsty, well built, a bit heavy, and in the mid-low price range.
The hollow titainum shaft is 4mm at the bearings, which have a 9mm outer diameter. They use a 1.5mm set screw with a tapered bushing. The threadlocking compund seems appropriate, and removal of the screw was no problem. Stators measured 22.1* 7.3 mm, which seems about right given the epoxy on the top/bottom of the stators adding a little to the overall thickness. The shaft is press-fit into the bell, which is anodized then milled for a 2-color scheme on the top.
One design trick used by sunnysky, which is likely related to the thrust numbers, is that the flux ring wraps around the bottom of the magnets by a MM or so. This feature, along with the beefier bell top both add weight, contributing to a total weight of 35.2 g, putting this motor in at the heavier end of the 2207 offerings.
This motor produced the most thrust out of a 6S motor measured to date. It performed well on all of the props measured, up to and including the buttercutter 5x5x3. Max measured thrust was 2098 g, but it pulled a steady 46 amps doing so. It is outside the scope of this review to discuss, current draw in the air vs. on the bench, as well as the ability of a battery to deliver the necessary current for these thrust values, but suffice to say, this motor will require a bigger battery than most others in this category.
It makes sense to compare this motor to the next closest competitor, the HGLTech Flame 2207 1775 KV. On the steepest props that were shared in both motor tests, the Sunnysky produces ~50g more thrust at the cost of 1 amp. The flame does weigh in at 3.5g less per motor, but that does not seem to affect throttle ramp response, so it's not a rotating mass issue, but it is a 14g total weight increase per quad, which eats into its thrust advantage. At the time of this writing, the Sunnysky motor is available ~$5 less per motor than the HGLTech one.
This motor would make an excellent choice for a high-power GoPro hauler, or a top speed contender. It's heavy, and very thirsty, but with the right battery and overall build choices, this could make for an exciting build.
One thing worth mentioning is that the buttercutter 5x5x3 made more thrust at the same current draw when compared to the HQ 5.1x4.9x3. I'm not sure if this speaks more to the prop, or the motor's ability to push it, but I like to point out efficiency gains whever noted. It's always possible to get more power, but seldom without a corresponding increase in current draw.