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ZMX FinX30 IJN Akatsuki
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The big mean brother of the FinX23 from ZMX.

Check out the full list of motors in this series here

Summary

Published: Nov 23, 2017 by quadmcfly

ZMX FinX30 IJN Akatsuki

Tested KV:2640kv
Weight:30.8g
Stator W:22mm
Stator H:7mm
The FinX series from ZMX is pushing the limits of motors design, trying some truly new things in the bell and flux-ring design.  You can read a full discussion of the new innovations in the FinX 23 write-up.  This motor takes the concept scales it up significantly, increasing the stator size to 2207. Interesting note, that ZMX calls their stator sizes 0.5 larger than some other manufacturers due to the overhanging magnets (8mm tall on the FinX30 and 6mm tall on the FinX23) but if you count the number of plates on the stator they are still in line with the 7mm stator height.  The combined effect works out to about a 0.5mm increase in stator height.  The fact that ZMX has been able to fit the increased magnet mass into a motor just under 31g is fairly amazing. Given that the other motor that has the same specs in magnet and stator size is the Cobra 2207, which comes in at 36g this is an impressive feat for the FinX motor.

Results

The results hear are similar in effect to the FinX23 though different in scale.  The motor falls just short of the equivalent Cobra motor in terms of output. The thing that stood out to me in this test, as well as the FinX23, is that the coils don't seem to be cooling as effectively. The heat losses are evident in the data as you can see a fairly consistent drop-off in thrust as the coils heat over the 2 second sustained throttle bursts.  This seems to account for a good portion of the lower thrust. It's also important to note that this is greatly emphasised by static load testing where airflow is greatly restricted. In flight with proper air flow the heat will be much less of an issue, but it is something of which to be aware. Even with the heat losses here though, the performance is dramatic for a sub 31g motor.  It easily clears 1500g of thrust on the mid-weight 5" props, and well into the 1600g range on the heavier 5" props with instantaneous peaks coming very close to 1700g.  As mentioned, the efficiency here is not the best, but pushing a light weight motor to this type of output seems to come at a cost.  It is interesting to note that the efficiency increases dramatically lower in the throttle and seems to loose ground mostly in the last 15% or so, likely due to the heat buildup. At 600g of thrust the FinX30 is essentially identical to the Cobra in g/w.  Given the intended application for these motors, the low weight, and increased dynamic unloading, they should be viciously fast on a light weight racer with mid-weight or light-weight prop.