The Extra 2mm Is Not the Answer: UMT 2812 vs 2814 Motors
Quick Answer
A 2814 has the same 28mm stator diameter as a 2812, but 2mm more stator height and about 16.7% more theoretical stator volume. That does not make every 2814 installation stronger. Propeller, voltage, winding, ESC and cooling decide what the complete powertrain can safely deliver.
What Those Four Digits Actually Tell You
The first two digits describe stator diameter; the last two describe stator height. On paper, the taller 2814 should offer more torque than a comparable 2812 because it has more active magnetic volume. The catch is the word “comparable”: two motors with the same 1100KV label can still use different windings, magnets, bearings and thermal designs.
That is why we list the UMT 2812 1100KV and UMT 2814 1100KV as separate power-system choices, not automatic upgrades. The 2814 weighs 88.3g including its wire, only 4.5g more than the 83.8g 2812, but their published thrust tables use different test conditions.
The Thrust Tables Are Not a Race
| Catalogue detail | UMT 2812 1100KV | UMT 2814 1100KV |
|---|---|---|
| Motor weight | 83.8g including wire | 88.3g including wire |
| Published test voltage | 24V | 16V |
| Highest listed test load | 8×4.5×3 at 64.1A | 9×5×3 at 43.9A |
| Highest listed static thrust | 3,722g | 2,216g with 10×4.5×2 |
| Mounting | 19mm, four M3 holes | 19mm, four M3 holes |
Reading only the final thrust column makes the 2812 look decisively stronger. That conclusion is false: it was tested at 24V with an 8-inch tri-blade, while the 2814 table uses 16V and several 9- and 10-inch props. Voltage, diameter, pitch and blade count all changed, so the numbers cannot isolate the motor.
Our rule is simple: compare thrust and current only at matched voltage and matched propeller. Use the published rows to size one known combination, not to invent performance for another. Our broader motor, ESC and prop matching article explains the full chain.
What We Would Actually Fit
For an 8-inch 6S build using an 8×4.5×3 prop, we would start with the 2812 because that is the combination represented by its 24V data. Its 64.1A ten-second peak also means we would not pair it with a marginal ESC or assume a “60A” label provides unlimited headroom.
For a 9- or 10-inch build, the taller 2814 is the more interesting starting point, especially where torque matters more than minimum motor mass. However, its catalogue data is at 16V. We would not run this 1100KV motor on a 10-inch prop at 6S merely because both limits appear separately on a listing; we would require matched bench data first. See our motor selection guide by aircraft class, then choose from our brushless motor range.
FAQ
Q: Is a 2814 always more powerful than a 2812?
A: No. It has more theoretical stator volume, but winding, KV, propeller, voltage and cooling determine usable output.
Q: Can I replace one 2812 motor with a 2814?
A: Not on a multirotor. Keep all four motors matched in model and KV; mixed motors can respond differently and make tuning or current loading unpredictable.
Q: Does 1100KV mean both motors use the same propeller?
A: No. KV describes no-load speed per volt, not a safe propeller size. Use test data for the exact voltage and prop, then confirm ESC and battery headroom.