3115 FPV Motor Showdown: BrotherHobby T5 vs Flash Hobby A3115 vs GEPRC EM3115 vs T-MOTOR V3115 (8–11-inch LR)
Overview
If you’re building an 8–11-inch long-range or cinematic quad, the 3115 class is a sweet spot for torque, stability, and efficiency on larger props. Below we compare four popular 3115 motors using only the published specs and test data: BrotherHobby Tornado T5 3115 Pro, FlahHobby Arthur A3115 900KV, GEPRC EM3115 900KV, and T-MOTORHOBBY V3115.
Quick look at each motor
BrotherHobby Tornado T5 3115 Pro: 12N14P design with Al 7075 base/bell, N52H arc magnets, titanium alloy hollow shaft, M5 prop thread, and 5–8S support. Multiple KV figures are listed in the materials, and there’s a 1200KV test sheet with detailed electrical data.
FlahHobby Arthur A3115 900KV: 12N14P, Ø37.1 × 32 mm, 5 mm shaft, NSK 5×11×5 mm bearings, 16 AWG/300 mm leads, 3–6S rated. Extensive 6S static tests with 10×5 props show up to 4205 g thrust and 1768 W peak power.
GEPRC EM3115 900KV: Long-range–oriented 12N14P motor with N52H magnets, NSK/NMB bearings, M5 threaded prop interface, Ø37.5 × 30 mm size, 310 mm 18-AWG leads, 6S. Rated 1620 W max, 65 A peak; bench data includes 10×5 prop results.
T-MOTORHOBBY V3115: Cinematic-focused 12N14P lineup in 400/640/900/1050KV, wide 3–12S range, electrophoresis iron core, anti-slip prop groove, and 18AWG/250 mm leads. Per-KV sheets list internal resistance, idle/peak current, power, and weight (incl. cable).
Comparison Table
| Parameter | BrotherHobby Tornado T5 3115 Pro | FlahHobby Arthur A3115 900KV | GEPRC EM3115 900KV | T-MOTORHOBBY V3115 |
|---|---|---|---|---|
| Model | BrotherHobby Tornado T5 3115 Pro | FlahHobby Arthur A3115 900KV | GEPRC EM3115 3115 900KV | T-MOTORHOBBY V3115 |
| KV | 400/640/900/1050/1200KV (title); 900KV/1050KV/1520KV; 1200KV (sheet) | 900KV (custom KV optional) | 900KV | 400KV / 640KV / 900KV / 1050KV |
| Configuration | 12N14P | 12N14P | 12N14P | 12N14P |
| Dimensions | 37.5 × 49.5 mm (sheet) | Ø37.1 × 32 mm | Ø37.5 mm × 30 mm | φ37.2 × 51.1 mm |
| Shaft Diameter | 5.0 mm | Ø5 mm | INS OUT5 | |
| Prop/Shaft Thread | M5 | M5 threaded prop shaft | ||
| Weight (incl. wires) | 110 g with 25 cm wires (110.23–110.66 g in sheets) | 117 g | 115 g | 113.4 g / 113.3 g / 113.1 g / 112.7 g |
| Lead Wires | 18AWG 25 cm | 16 AWG, 300 mm | 310 mm / 18-AWG | 18AWG 250 mm |
| Rated/Input Voltage | 5–8S; (sheet lists 6S) | 3–6S LiPo | 25.2 V (6S LiPo) | 3–12S |
| No-load/Idle Current | Idle Current: unknown; Idle Current @1V: 2.66 A (sheet) | 1.4 A @ 10 V | 0.59 A / 1.10 A / 1.57 A / 1.79 A (10 V) | |
| Max/Peak Current | 72.04 A (60 s) | 65 A (peak) | 41 A / 62 A / 83 A / 83.6 A (10 s) | |
| Maximum Power | 2055.52 W (sheet) | 1768 W | 1620 W | 1982 W / 1927 W / 1894 W / 1903 W (10 s) |
| Peak Static Thrust | 4205 g | 4032 g (MQ10×5, 6S) | ||
| Mount Pattern | M3 (19×19 mm) | 19×19 mm, M3×4 | 19 mm × 19 mm, 4×M3 | |
| Prop Mount (PCD) | 4×M3 on Φ19 mm | Ø19 mm, 4×M3 | ||
| Bearings | Japanese NMB 11×5×5 mm | NSK 5×11×5 mm | NSK/NMB | NSK/NMB (listed) |
| Magnet Grade | N52H arc magnets; Ns2H (listed) | N52H | ||
| Internal/Interphase Resistance | 35.16mo; 25.97 mΩ (1200KV sheet) | 0.037 Ω | 46 mΩ | 145.38 mΩ / 67.13 mΩ / 38.08 mΩ / 33.84 mΩ |
| Recommended Props | 9–11" (9–10" for best efficiency) | 8–10-inch | 8–11 inch | |
| ESC Suggestion | 6S, 90A (sheet) | 60–80 A | 60–80 A | |
| Materials (base/bell) | Al 7075 base; Al 7075 bell cap | |||
| Shaft Material | Titanium Alloy hollow shaft | 5 mm solid shaft | 5 mm steel shaft | |
| Stator | 0.2 mm Kawasaki silicon steel | Electrophoresis iron core (listed) |
Feature-by-Feature
KV and voltage range
BrotherHobby’s published materials list several KV options (400/640/900/1050/1200KV; also 900/1050/1520KV appear) and 5–8S support with a 6S sheet. FlahHobby A3115 is a 900KV, 3–6S motor with optional custom KV. GEPRC EM3115 is a 900KV 6S unit. T-MOTORHOBBY V3115 spans 400/640/900/1050KV with a very wide 3–12S range and KV-to-voltage pairing guidance in the images.
Power, current, and thrust
On 6S static tests with 10×5 props, FlahHobby A3115 reaches up to 4205 g thrust and 1768 W. GEPRC’s datasheet shows up to 4032 g on a MQ10×5 prop at 23.47 V, 66.71 A (1565.7 W). T-MOTORHOBBY V3115 lists per-KV max power around 1894–1982 W (10 s). BrotherHobby’s 1200KV sheet shows 2055.52 W and 6S, 90A ESC guidance.
Thermals and efficiency notes
FlahHobby reports motor surface temps in the low-40 °C range during short 6S bursts (e.g., 39.1–44 °C after 15 s in their prop tests). GEPRC’s table lists max temps of 71 °C (MQ9×4.5) and up to 97 °C (MQ10×5) under bench load. T-MOTORHOBBY provides detailed prop test charts by KV; the V3115 is marketed with a heat-dissipation design.
Build quality and components
BrotherHobby specifies Al 7075 base/bell, N52H arc magnets, and a titanium alloy hollow shaft with NMB bearings. FlahHobby uses a CNC 6061-T6 bell, NSK bearings, and long 16 AWG leads. GEPRC lists N52H magnets, NSK/NMB bearings, and a 5 mm steel shaft. T-MOTORHOBBY highlights an electrophoresis iron core and an anti-slip prop groove, with NSK/NMB bearings.
Weight and leads
Weights (incl. wires) are tightly grouped: BrotherHobby ~110–110.66 g (listed), FlahHobby 117 g, GEPRC 115 g, and T-MOTORHOBBY ~112.7–113.4 g depending on KV. Lead lengths: BrotherHobby 25 cm (18AWG), FlahHobby 300 mm (16 AWG), GEPRC 310 mm (18-AWG), T-MOTORHOBBY 250 mm (18AWG).
Mounting and prop interface
BrotherHobby, FlahHobby, and GEPRC specify the common 19×19 mm, M3 mount pattern (prop PCD also stated for FlahHobby and GEPRC). BrotherHobby and GEPRC list M5 prop threads; FlahHobby specifies a 5 mm shaft with 4×M3 on Φ19 mm prop mount. The V3115’s mount/PCD aren’t stated; the product emphasizes an anti-slip prop groove instead.
Pros & Cons
BrotherHobby Tornado T5 3115 Pro
- Pros: 12N14P; Al 7075 base/bell; N52H arc magnets; titanium hollow shaft; M5 prop thread; NMB bearings; 5–8S and 6S sheet available; detailed 1200KV electrical sheet.
- Cons: KV options and some dimensions vary across the listed sheets; one sheet shows “Idle Current: unknown.” Peak thrust data not provided.
FlahHobby Arthur A3115 900KV
- Pros: Extensive 6S test data (10×5 props) with up to 4205 g thrust; 1768 W max; low reported surface temps (≈39–44 °C); NSK 5×11×5 mm bearings; long 16 AWG/300 mm leads; clear 19×19 mm/M3 mounting and Φ19 mm prop PCD; 3–6S.
- Cons: 3–6S rating (no 8S/12S option listed on this page).
GEPRC EM3115 900KV
- Pros: 1620 W, 65 A peak (6S); N52H magnets; NSK/NMB bearings; M5 threaded prop shaft; 19×19 mm, 4×M3 mount; 310 mm/18-AWG leads; detailed bench data including 10×5 prop results.
- Cons: Datasheet shows max temps up to 97 °C on MQ10×5; 6S input.
T-MOTORHOBBY V3115
- Pros: Cinematic-focused features (heat dissipation, anti-slip prop groove, electrophoresis iron core); very wide 3–12S coverage; per-KV electrical data; 8–11 inch prop guidance; NSK/NMB bearings; competitive weights.
- Cons: Mount/PCD not stated in the sheet here; shaft diameter text appears as “INS OUT5.” Peak thrust not listed.
Use Cases
- 9–11" 6S long-range cruiser with strong published thrust data: FlahHobby Arthur A3115 900KV (up to 4205 g on 10×5 at ~24.6 V).
- 8–10-inch LR platform on 6S with M5 threaded interface and detailed prop tables: GEPRC EM3115 900KV (up to 4032 g on MQ10×5 at ~23.47 V).
- 8–11 inch cinematic X4/X8 rigs, flexible voltage (3–12S) and per-KV specs: T-MOTORHOBBY V3115.
- 5–8S builds seeking premium materials (Al 7075, titanium hollow shaft, NMB bearings) and 12N14P with M5 thread: BrotherHobby Tornado T5 3115 Pro.
Recommendations
Pick by battery S and prop size (based on listed data)
- If you fly 6S with 10×5 props and want published thrust/efficiency curves: choose FlahHobby Arthur A3115 900KV or GEPRC EM3115 900KV.
- If you need a wide voltage span (3–12S) and cinematic features for 8–11 inch props or X4/X8: pick T-MOTORHOBBY V3115 (select KV per the provided pairing: 400KV 6–12S, 640KV 4–8S, 900KV 4–6S, 1050KV 3–6S).
- If your build targets 5–8S with premium construction and M5 prop thread: BrotherHobby Tornado T5 3115 Pro.
Match ESC and wiring to current draw
- FlahHobby and GEPRC both suggest 60–80 A ESCs for 6S use; BrotherHobby’s 1200KV sheet lists “6S, 90A ESC.” T-MOTORHOBBY V3115 provides per-KV peak current figures (up to ~83.6 A for 1050KV, 10 s).
Mounting and hardware check
- Three motors specify the 19×19 mm, M3 pattern (FlahHobby, GEPRC, BrotherHobby). Confirm prop interface: M5 threads are listed for BrotherHobby/GEPRC; FlahHobby uses a 5 mm shaft with 4×M3 on Φ19 mm prop PCD.