Why the 4112 Motor Is the Sweet Spot for VTOL Fixed-Wing Drones
If you’re building or upgrading a vertical takeoff and landing (VTOL) fixed-wing UAV in the 4–6 kg takeoff weight class, the 4112 brushless motor (41mm stator diameter, 12mm stator height) is the motor you keep seeing in every serious build log. There’s a reason for that.
The 4112 form factor occupies the goldilocks zone between the agile but light-lift 3508/3510 class and the heavy, power-hungry 5010/6015 class. Pair it with a 15–17 inch propeller on 6S LiPo, and you get a propulsion package that delivers 2.5–3.5 kg of thrust per motor with efficiency numbers that make a real difference in endurance.
At X-TEAM, we’ve been manufacturing brushless motors for the RC and UAV industry since 2007. Below is our field-tested selection framework for choosing and deploying 4112 motors in VTOL applications.
1. Understanding the 4112 Motor Spec
Parameter Typical Value Notes
Stator Diameter 41 mm Wide stator = high torque density
Stator Height 12 mm Short stack = higher KV options
KV Range 340 – 500 340–400 KV for 6S 17″; 400–500 KV for 6S 15″
Motor Weight 150–185 g Light enough for multi-rotor booms
Max Continuous Current 25–35 A Depends on winding & cooling
Peak Thrust (6S, 17×5.8) ~3.2 kg At sea level, static
Recommended ESC 40A BLHeli_32 Headroom for transient loads
Propeller Range 15×5 – 17×5.8 Carbon fiber recommended
LiPo Configuration 6S (22.2V) Standard; 8S possible with lower KV
2. KV Selection: 340 vs 400 vs 500
Choosing the right KV is the single most important decision in a VTOL motor setup.
340 KV — Maximum Endurance
Best for: 17×5.8″ props, mapping/survey drones
Hover current: ~5–7 A per motor (4–5 kg AUW quad-VTOL)
Efficiency sweet spot: 50–65% throttle
Pros: Lowest current draw, longest flight time, cool operation
Cons: Reduced top-end thrust margin
400 KV — Balanced All-Rounder (⭐ Recommended)
Best for: 16–17″ props, general-purpose VTOL
Hover current: ~6–8 A per motor
Efficiency sweet spot: 55–70% throttle
Pros: Best thrust-to-current compromise, wide prop compatibility
Cons: Slightly higher hover current than 340 KV
500 KV — High-Speed Cruise
Best for: 15×5″ props, fast-cruise fixed-wing
Hover current: ~8–10 A per motor
Efficiency sweet spot: 60–75% throttle
Pros: Faster forward flight, better wind penetration
Cons: Higher power consumption, more heat
3. Real-World VTOL Build Configuration
Here is a proven configuration we’ve tested and recommend:
Airframe: Quad-plane VTOL (4+1 layout)
AUW: 5.2 kg
Motors: 4× X-TEAM 4112 400KV (lift)
ESC: 4× 40A BLHeli_32
Props: 17×5.8″ carbon fiber (CW/CCW pairs)
Battery: 6S 22,000 mAh LiPo
Flight time: ~45 min (mixed hover + cruise)
For builders who need a forward propulsion motor in addition to the four lift motors, we recommend a 3520 550KV on a 12×6 pusher prop, paired with a 60A ESC.
4. X-TEAM 4112: What Sets It Apart
After 15+ years manufacturing BLDC motors in Dongguan, here’s what we bring to every 4112 we ship:
Japanese NMB bearings — ABEC-5 rated, sealed both sides
N45SH curved magnets — High-temp grade, minimal flux leakage
0.2mm Kawasaki silicon steel laminations — Low iron loss at high RPM
Hand-wound stators — Consistent winding tension, minimal phase resistance variance (<3% across batches)
Dynamic balancing — Every rotor balanced to <5mg at full RPM
IP43-rated construction — Protected against light rain and dust ingress
OEM Note: All X-TEAM 4112 motors can be customized — alternative KV windings, longer/shorter shafts, custom anodizing colors, and branded packaging. Minimum order quantity (MOQ) for custom orders is 50 units.
5. Installation Checklist for VTOL
Mount rigidly. Use aluminum motor mounts with M3 bolts ≥8mm thread engagement. Nyloc nuts or thread lock mandatory.
Balance your props. Even a 0.1g imbalance at 6000+ RPM generates vibration that kills bearings and confuses flight controllers.
Calibrate ESCs. Always run a fresh ESC calibration after changing motors or props.
Check motor direction before first flight — two motors CW, two CCW for a quad-VTOL layout.
Monitor temperature on first three flights. Motor can temperature should stay below 65°C. If hotter, reduce prop pitch or increase airflow.
Secure wiring. Use braided sleeve + zip ties. Loose wires in a VTOL transition are the #1 cause of in-flight failures.
6. Common Questions
Q: Can I run 4112 on 8S?
Yes, with the 340 KV variant. You’ll see ~20% more thrust but at higher current. Ensure ESCs are rated for 8S.
Q: What’s the difference between 4112 and 4114?
The 4114 has a 2mm taller stator (14mm vs 12mm), giving roughly 15% more torque at the same KV. It’s ~20g heavier. The 4112 offers better power-to-weight for most VTOL applications.
Q: How do I order X-TEAM 4112 motors?
Visit x-teamrc.com or contact our sales team at info@x-teamrc.com. We ship globally with typical lead times of 3–5 business days for stocked items.
7. Summary: When to Choose the 4112
Your Build Motor Choice Why
4–5 kg VTOL, mapping 4112 340KV + 17″ Longest endurance
4–6 kg VTOL, general 4112 400KV + 16″ Best overall balance
3–4 kg VTOL, fast cruise 4112 500KV + 15″ Speed and agility
3 kg quadcopter (pure multi-rotor) 3508 or 3510 Lighter is better
7+ kg heavy-lift VTOL 5010 or 6015 Need more torque
