When building a high-performance FPV drone, motor selection can make or break your entire setup. Two of the most popular choices in X-TEAM’s FPV motor lineup are the XTO-3115 and XTO-2807. Both are purpose-built for multi-rotor applications, but they serve very different build philosophies. After testing both motors across multiple 5-inch and 7-inch builds, here’s my hands-on comparison to help you decide.
Understanding the Numbers: 3115 vs 2807
The naming convention tells you the stator size: 3115 means 31mm stator diameter with 15mm height, while 2807 means 28mm diameter with 7mm height. This single difference in stator volume — roughly 11.3cm³ versus 4.3cm³ — explains almost everything about how these motors behave differently.
The 3115’s larger stator means more copper fill, more magnetic material, and ultimately more torque. But it also means more weight — typically 55-65g per motor versus 35-42g for the 2807. On a quad, that’s an 80-100g weight penalty right off the bat.
XTO-3115: The Torque Monster
The XTO-3115 is what I’d call a heavy-lift specialist. With its massive stator volume and typically 900-1300KV windings, this motor excels at spinning larger propellers — think 7-inch, 8-inch, or even bigger — without breaking a sweat.
Best Use Cases for XTO-3115
- 7-inch long-range cruisers: The low-end torque lets you swing 7×4×3 or 7×5×3 props at low RPM, maximizing flight time
- Cinelifter builds: When you’re carrying a GoPro, LiPo brick, and maybe even a Blackmagic — the 3115 doesn’t care. It just pulls
- Heavy X-Class rigs: If you’re building something in the 9-13 inch range, the 3115 is arguably the minimum viable motor
- Payload delivery drones: Need to carry 500g+ of payload? The 3115’s torque reserve means you won’t brownout your ESC on punch-outs
Recommended setup: Pair with a 6S battery, 45-60A BLHeli_32 ESC, and 7×4×3 propellers. Expect 1900-2300g of thrust per motor at full throttle — enough to give a 2kg quad a 4:1 thrust-to-weight ratio.
XTO-2807: The Freestyle Precision Tool
The XTO-2807 hits the sweet spot for 5-inch freestyle and racing. The 28mm stator with slimmer 7mm height keeps weight down where it matters most — on the ends of your arms, where rotational inertia kills responsiveness.
Best Use Cases for XTO-2807
- 5-inch freestyle: 1700-1950KV on 6S gives you that instant punch-out feel without the weight penalty. Perfect for matty flips and power loops
- 5-inch racing: 1950-2200KV windings let you run lighter props (5×4×3) at higher RPM for top-speed runs
- Lightweight 6-inch builds: If you’re keeping your AUW under 700g, the 2807 handles 6-inch bi-blades cleanly
- Cinewhoops: Protected 3-3.5 inch ducted builds benefit from the 2807’s efficiency at part-throttle
Recommended setup: 6S battery, 40-50A ESC, 5×4.3×3 propellers. Expect 1400-1700g of thrust per motor, giving a 650g freestyle quad a 9:1+ thrust ratio — more than enough to recover from any inverted situation.
Head-to-Head Comparison
| Spec | XTO-3115 | XTO-2807 |
|---|---|---|
| Stator Size | 31mm × 15mm | 28mm × 7mm |
| Weight (per motor) | 55-65g | 35-42g |
| Typical KV Range | 900-1300KV | 1700-2200KV |
| Prop Size Range | 7-10 inch | 5-6 inch |
| Thrust (6S, full throttle) | 1900-2300g | 1400-1700g |
| Best Battery | 6S 1800-2200mAh | 6S 1300-1550mAh |
| Recommended ESC | 45-60A | 40-50A |
| Ideal Build Weight | 1.5-3kg | 500-800g |
Real Flight Impressions
3115 on a 7-inch long-range rig (6S, 1000KV, 7×4×3): The throttle feels almost diesel-like. There’s this deep, authoritative torque band from 20-60% throttle where the quad just floats. You can cruise at 40% throttle pulling 8-10A total, giving you 18-22 minutes on a 6S 2200mAh pack. Punch-out is more of a steady surge than a snap — it won’t throw you back in your seat, but it’ll lift a GoPro like it’s not even there. Motor temps after a 20-minute cruise: barely warm at 45°C.
2807 on a 5-inch freestyle rig (6S, 1850KV, 5×4.3×3): Completely different animal. Throttle response is instant — you breathe on the stick and the quad jumps. Low-end resolution is good enough for smooth proximity flying, but where this motor really shines is mid-to-top end. That 1850KV on 6S with a responsive BLHeli_32 ESC gives you a powerband that feels almost telepathic through gates. Motor temps after 3 minutes of aggressive freestyle: 65-70°C — warm but well within safe limits.
Which Motor Should You Choose?
Choose the XTO-3115 if:
- You’re building a 7-inch or larger quad
- You plan to carry payload (GoPro, action cam, delivery package)
- Flight time matters more than acrobatic agility
- You want headroom — the 3115 runs cooler under load because it’s rarely pushed near its limit
Choose the XTO-2807 if:
- You’re building a 5-inch freestyle or racing quad
- Weight is your primary concern — every gram on the arm matters
- You want crisp, immediate throttle response
- You prioritize agility and snap over raw lifting power
My take: For 90% of FPV pilots flying 5-inch, the XTO-2807 is the right call. It’s lighter, snappier, and the power is more than adequate for anything short of carrying a cinema camera. The XTO-3115 makes sense when you specifically know you need the extra torque — 7-inch long-range, heavy cine-lifters, or commercial payload applications.
Both motors come from X-TEAM’s precision manufacturing line with N52SH magnets, Japanese bearings, and dynamic balancing out of the box. Whether you go 3115 or 2807, you’re getting a motor built to the same quality standard that DJI, SMC, and Castle trust for their OEM requirements.