T-MOTOR U8 II KV100 (U Efficiency)
Series: T-MOTOR Brushless motors for drones
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The U8 II KV100 from the U-Efficiency series by T-MOTOR, a Chinese maker, is a heavy-lift multicopter motor (36N42P) for 12S industrial drones with propellers of 27 to 28 inches.
The motor weighs 272 g and measures 87.1 x 29.1 mm; its shape is wide and flat. At KV 100 and 44.4 V nominal that works out to about 4,400 rpm at no load. The peak current of 29.3 A applies for 180 s. As maximum thrust the overview quotes 7,300 g, more than 26 times the motor's own weight. The specification table lists a total thrust of 14, 21 and 28 kg for quad-, hexa- and octocopters with 28-inch propellers, that is 3.5 kg per motor. The recommended propeller is the G28x9.2.
For classification the take-off mass of the whole aircraft counts, not the thrust: C3 and C4 reach up to 25 kg, above that the specific category with an operational authorisation applies, and Remote ID is mandatory for C1 to C3. A 12S battery at 44.4 V nominal passes the 160 Wh air-transport limit from about 3.6 Ah; up to 100 Wh it travels freely in hand baggage, between 100 and 160 Wh only with the airline's approval.
For industrial drones operation near the hover point counts, not peak thrust; the wide, flat build supplies plenty of torque at low speed for that. The ESC must allow 12S and carry the 29.3 A with headroom. Check the bearing run, the winding insulation under sustained heat and the bell's concentricity.
Technical data
Other data
| Cell count (S) | 12Scorrect |
|---|---|
| Dimensions (mm) | 87.1x29.1correct |
| KV (rpm per volt) | 100correct |
| Maximum current (A) | 29.3correct |
| Maximum thrust (g) | 7,300correct |
| Power rating time base (s) | 180correct |
| Recommended propeller | 27-28 Zoll (G28x9.2)correct |
| Weight (g) | 272correct |
What to check before buying
- Check the hour meter against the service records — a replaced instrument is the most common gap.
- Compare the data plate and chassis number with the papers.
- Ask about parts availability for this build year — the running costs hang on it.
A general list for this type of machine — no substitute for an inspection or an appraiser.
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