Latest from eMotres

8 kW/kg continuous — on a 125 g motor

We just measured 1,014 W of continuous shaft power from the CIANO14 40_12 — 8.11 kW/kg from a 125-gram motor, on a 3-blade 10×5 propeller at 24.6 V / 55 A.

What makes it possible: the AeroStator Core™ topology gives twice the stator cooling surface of a conventional design; rectangular wire coils halve the winding resistance — and the solid copper cross-section doubles as a heat sink, so the same part that generates less heat also carries it away; and an optimized drive, achieved together with FOURnamics GmbH and their nCTRL ESC.

A stator topology can only deliver what the ESC lets it deliver — and nCTRL let it deliver everything.

Half the mass, same thrust class — CIANO14 vs the 4215 heavy-lift motors

Want to take half a kilo off your quadcopter without giving up efficiency? Look at your motors — that is where the weight is hiding. The 4215-class motors most heavy-lift quads fly weigh 257–262 g each. The CIANO14 40_12 weighs just 125 g — and covers the exact same thrust envelope.

Together with FOURnamics GmbH and their nCTRL ESC we benchmarked the CIANO14 40_12 against three 4215-class motors on the same 6S bench (AERONAUT 12×5 2-blade):

Every aerodynamic advantage was on the competitors’ side — their 3-blade 13″ props offer ~17 % more disc area than our 2-blade 12″ — yet the CIANO14 still delivered superior efficiency.

And 500 g off the airframe is never just 500 g: it means less thrust required to hover, lower current draw, and extended flight time — or the ability to carry 500 g more payload with zero penalty. Half the mass. Same thrust class. Higher efficiency.

Two coaxial motors, or one bigger prop? The payoff is flight time

A common heavy-lift setup: a coaxial pair of T-Motor V3115 on 10″ props — 600 W of shaft power. But coaxial props fight for the same air — the lower one loses ~20 % of its efficiency in the wake of the upper.

Our proposal: replace them with one CIANO14 40_12 on a 12″ prop, tuned to the same thrust. On AeroStator Core™ technology. Same thrust (~2,865 g), same battery:

The catch: the single 12″ prop runs at ~2× the torque — where our flat-wire winding earns its place, holding high torque at high efficiency without overheating.

These figures are an estimate — the 12″ operating point is modeled from our measured 10″ data. Bench validation on 12″ is next, and we’ll publish the numbers. AeroStator Core™ is open for licensing and co-manufacturing partners.

84.2 % system efficiency on FOC — the CIANO14 40_12 completes its sinusoidal round

We just finished the FOC round on the CIANO14 40_12 — our 125-gram 3115-class inrunner, built on AeroStator Core™. Peak system efficiency (controller + motor, measured at the bus) reached 84.2 %, holding an 82–84 % plateau across the working range. For comparison, our earlier run on a trapezoidal BLDC controller peaked at 76.9 %.

Why it matters: a standard 3115 motor tops out around 300–350 W continuous. This one sustains 6 kW/kg — more than 2.5× the continuous power of any 3115-class motor we’ve benchmarked against. Same form factor, 2.5× the sustained output. In UAV propulsion, every single watt-hour saved is extra payload and flight time.

6 kW/kg continuous — the CIANO14 40_12 runs 30 minutes straight

We ran the CIANO14 40_12 on a propeller test stand for 30 minutes straight — roughly 2.5× the sustained power of any 3115-class motor on the market. Here’s what the stand logged at minute 29 (125 g motor):

A standard 3115 tops out at 300–350 W continuous before hitting thermal limits. Same form factor — 2.5× the sustained power. The winding stays within its 200 °C insulation limit throughout.

An inrunner that beats the class-leading outrunner

First bench tests of the CIANO14 40_12, built on AeroStator Core™, challenge a basic assumption in this class. Conventional wisdom says outrunners own drone propulsion on efficiency and thrust density — our first data says otherwise.

Benchmarked on the same propeller and the same 24 V against the class-leading T-Motor V3115 outrunner:

And these are trapezoidal BLDC results — we haven’t switched to FOC yet, so there’s clear room to grow. Next: a controller integrated directly into the motor, 0.15 mm laminations, and foil (flat) coils.

First test results — the 150_30 reaches 50 kg continuous thrust

The first drone-propulsion motor built on AeroStator Core™ completed its initial bench tests on a thrust stand. At 50 kg continuous thrust (56″ propeller, BLDC controller):

The AeroStator Core™ architecture turns the stator yoke into an active cooling structure — enabling tangential polarization with standard F45SH magnets at performance levels that usually demand much heavier or more expensive cooling. The roadmap: 60 kg continuous thrust at the same 3 kg, via FOC integration, 28- vs 42-pole analysis, and 63″ propeller tests.