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RCINPower Mark I 2750kv
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The latest high performance FPV motor from RCINPower.

Check out the full list of motors in this series here

Summary

Published: Jun 6, 2018

RCINPower Mark I 2750kv

Tested KV:2760kv
Weight:35.6g
Stator W:23mm
Stator H:6mm
RCINPower has been a quite participant in the hobby scene for quite some time, producing some of very high quality and high performing motors, but failing to achieve much notoriety in the community. This Mark I design has real potential to blow that out of the water and see some much-deserved positive attention for RCINPower. RCINPower produces some of the best build and finish quality motors I've seen cross the bench, and this Mark I motor is an excellent example. The two-tone anodizing is beautiful and the visual design is flawlessly executed. The structural design is also well done, though it is based on an older paradigm with a 16x19 mount,  closed base, and an aluminum integrated prop shaft. The functional aspects of the design have been well thought out, with magnets slightly taller than the stators, tight air gap, thick magnets and flux ring, and a 4mm internal hollow shaft with an alloy steel M3 x 4mm retaining bolt. The bearings are both 9x4x4 for added durability. One of the things that sets this motor apart from others is the fact that the flux ring is not painted like most motors on the market, but actually coated in a two process oxidization that creates a much harder and resilient surface in addition to allowing for much finer detail on the laser etching. The laser etched areas are also oxide coated in the second process to make the entire surface resistant to corrosion and scratching. It's a subtle thing, but a nice touch that adds a little extra to the motor design both visually and functionally. My only real complaint here is the weight. With the closed base design and the heavy magnets and flux ring this motor is pushed over the 35g mark, which for a 2306 is extremely heavy. Some changes such as an open base with less material and a fully hollow steel shaft would help both modernize the design and reduce the weight. All things considered this is an extremely strong start to this line of motors, especially for freestyle markets where weight is not a significant factor.

Results

This version of the Mark I is remarkably high Kv for the size and torque capacity of the motor, and as a result it delivers insane power. It's in competition with some of the top performers in the market, pushing it past the F60 Pro II, and matching the GepRC GR2306. The Kv tested at 2760kv, just a tad higher than the GepRC. This motor suffers from a similar issue as the others in its power class in terms of maximum current draw. The remarkable power out of this motor will definitely require a more careful attention to throttle control, though the current draw can be offset by either choosing lighter loaded props or using the flight controller throttle limiting features. The application here is fairly narrow because of the Kv, though the high torque and power are likely to be effective on a range of weight and use cases with the right battery and attention to throttle. The high torque and fast changes in RPM for this motor will make it appealing for applications looking for immediate response and tight control. I'm definitely looking forward to seeing more Kv and future designs in the Mark line.