3B-R 2407 2600kv
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Tested KV:	2660kv
Weight:	34.1g
Stator W:	24mm
Stator H:	7mm

BBB or 3B-R, depending on how you read it, came on the scene last year with some really beautiful designs, and this latest offering from them is no exception. The machining and finish work more than lives up to their previous offerings, improving on the design in several areas. Aside from the stator size, this design integrates a few innovative features that are rare even in today's prolific motor market. The usual features are present here: a Titanium alloy shaft, 16x16mm mount oapatte and open base design, insanely tight air gap, and strong arc magnets. The real interest features are on the bottom of the motor. The most innovative is a 5mm internal shaft that comes with both a circle clip and an optional 3mm retention bolt. This leaves it up to the user as to their preferred method for shaft retention. The bolt is a full M3 alloy steel bolt with a 2mm hex drive. The second interesting bit on the bottom is a thin sheet of nylon plastic between the screw holes and the stators. This provides some protection from motor bolts impacting the windings if the wrong length is used. The weight comes in at just over 34g, which is quite respectable for such a large stator.  My only concern with this motor is the lack of a magnet retention lip. On a high torque and high Kv motor, the retention lip becomes particularly critical to avoid slipped magnets, as these conditions put even the best glues to under significant pressure. Overall some interesting features and visually striking motor from 3B-R.