A new offering from FPVModel in their Dragonfly brand of motors.
Check out the full list of motors in this series here
Summary
Published: Mar 8, 2018 by quadmcfly
| Tested KV: | 2690kv |
| Weight: | 33.4g |
| Stator W: | 22mm |
| Stator H: | 7mm |
FPVModel has been producing motors and props under the Dragonfly brand for quite some time, in fact one of the earlier motors on the bench here was a high Kv 2206 motor. This latest release under the brand however is something completely new. The quality on this motor is top notch, on par with some of the best production quality I've seen in miniquad motors. Given the economy market for this motor that is quite impressive. The finish quality and workmanship is top notch, and the motor has all the signature features we have come to expect. In order to save weight this model has a 3mm solid steel shaft with an integrated aluminum prop adapter, however the steel portion of the shaft continues all the way up to the top of the prop adapter, which adds significantly to the strength. The shaft is also retained with a screw even though it keeps the 3mm internal diameter. One point to note is that the magnets on this motor are quite thick for the stator size. This brings the weight up a bit over what would otherwise be a remarkably light design, but given the weight is productive weight, this isn't really too much of a problem. Even with the heavier magnets, this motor only weighs in at just over 33g. The final production version of the motor removed some material from the motor which shaved a few grams based on their listed stats. Another design feature that stood out to me is a thin plastic shroud that covers the screw holes preventing damage to the windings. This is brilliant and I wish we'd see more manufacturers doing something similar. It's an easy solution and significantly cuts down on the risk of user error damaging a motor. Obviously with a light weight design durability is always a question, and only flight time and use/abuse will give an answer, but on all other fronts this motor is a spot on. My only complaint with this design is that it uses very thin gauge multistrand windings. However as you'll see below this doesn't seem to have impacted the performance in the least, though it could possibly impact the long term heat handling. On the short term there don't seem to be any ill effect, and the motor seemed to handle the heat fine even under extreme stress. Defintely a strong contender here from FPVModel, just based on the build.
Results
This motor is an aboslute monster. The Kv tested a tad higher than stated coming in at 2690kv, and man does it back that up! Normally I test even high Kv motors on all the 5" props even up to the heavy tri-blades and quad blades, just to see what they can do. I stopped this one on the HQ 5x4.5x3 v1s when it hit over 1700g of thrust at 45A. There's really not much point in going beyond that given the current limitations of our batteries. I can honestly say I've never seen a 2207 motor across the bench that put out that kind of power. The only other motor that has come close was the Northaero Typhoon, and it has a full half mm more stator height. Very impressive numbers out of this motor. The final production version very wisely has backed the the Kv down to 2500kv, which will definitely make this thing more manageable and applicable to a wider range of props and flight styles. At 2650kv this thing is limited to very light race rigs on light weight props, and very specific types of freestyle flying, while a 2500kv should scale that back to a broader audience. Overall this is a huge step in the right direction for FPVModel, especially given the low price point.
