28 Series
Ø28 stator · 6.5–12 mmFour stack heights on one Ø28 stator, 55 to 78 g. The short stacks rev for 6–7 inch props; the tall ones pull 9 inch at lower KV.
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Six frame series, named as the works order names them. Every frame opens on its own data sheet — the specification, the dimensioned drawing and the bench sweep for each winding.
31 Series
Ø31 stator · 10–15 mmThe step up from 28: same 14-pole rotor, more iron. 86 to 112 g, wound from 800 to 1580 KV depending on the prop it has to turn.
See all details32 Series
Ø32.5 stator · 14–20 mmHeavy-lift frame. The 20 mm stack measures just under 6 kgf on a 10 inch prop, and the low-KV winding runs it on 12S.
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40 Series
Ø39 stator · 12 mmAn 18N24P frame at 115 g, measured on two propellers: 4.6 kgf on a 16 inch, and 11.49 gf/W at part throttle — the efficiency end of the catalogue.
See all details42 Series
Ø42 stator · 18 mm300 g of stator and rotor for the large multirotor end, wound at 330 KV for 12S and 560 KV for 6S.
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52 Series
Ø63 envelope · 45 mm longThe largest frame published: eight M4 mounting holes on a Ø30/Ø44 pattern, 7.77 kgf measured on a 15 inch prop.
See all detailsOutside the scale? Start a custom brief and we wind around your numbers.