T-MOTOR U13 II KV65 (U Power)
Series: T-MOTOR Brushless motors for drones
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The U13 II KV65 from the U-Power series by T-MOTOR, a Chinese maker, is a heavy-lift outrunner for multicopters. The layout has 36 slots and 42 poles, and the housing measures 100 x 60 mm. It is designed for 22 to 25S and the G32x11 propeller.
The motor weighs 975 g and its KV is 65. With the nominal 3.7 V per cell, that works out on 22 to 25S to between about 5,300 and 6,000 rpm at no load. The peak current of 68 A applies for 180 s; at that voltage the electrical power works out to between 5.5 and 6.3 kW. The maximum thrust of 28,700 g is a test-stand value with the G32x11 propeller at 100 % throttle, more than 29 times the motor's own weight. ESC and battery are sized by current, not by a power figure without a time base.
A full 25S battery stands at 105 V (25 x 4.2 V). That is high voltage: assembly, cabling and maintenance belong in the hands of qualified staff, and the ESC must be rated for 25S. The EU open category ends at 25 kg take-off mass; above that an operational authorisation in the specific category is needed. A battery of this voltage sits far above the 160 Wh air-transport limit and falls under dangerous-goods rules.
The narrow range of 22 to 25S requires battery and ESC to match it exactly; with fewer cells, speed and thrust change markedly. The 32-inch propeller creates large radial loads on the bearings, so balancing matters. Before use, check the winding's insulation resistance, the bearing run and the bell's concentricity.
Technical data
Other data
| Cell count (S) | 22-25Scorrect |
|---|---|
| Dimensions (mm) | 100x60correct |
| KV (rpm per volt) | 65correct |
| Maximum current (A) | 68correct |
| Maximum thrust (g) | 28,700correct |
| Power rating time base (s) | 180correct |
| Recommended propeller | G32x11correct |
| Weight (g) | 975correct |
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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