3115 SL FPV Motor
The 3115 SL is a high-performance brushless motor engineered specifically for 7-inch to 10-inch long-range and cinematic FPV drones. Combining lightweight architecture with high torque, it provides excellent efficiency and responsive handling. This documentation covers the 900 KV variant with detailed specifications and test data.
Key Features:
- High Efficiency: Optimized for long-range cruising missions
- Robust Bearings: Premium Dual 685-zz bearings for ultra-smooth operation
- Propeller Mount: M5 shaft compatibility with anti-slip locknuts
- Lightweight design (113g) for agile performance
- High power density (up to 10.38 W/g maximum)
- 900 KV
900 KV - Specifications
Motor Specifications:
- KV Rating: 900 RPM/V
- Kt (Motor Torque Constant): 0.013 Nm/A @ 10812 RPM
- Weight: 113 g ± 5 g
- Max Thrust: 2,586g (with VT 1050-TRI BLADE GFN prop)
- Voltage Range: 18V – 24V (6S LiPo)
- Io (No Load Current @ 24V): 2.47A
- Max Continuous Current: 24A (180s)
- Max Continuous Power: 597W (180s)
- Power Density: 5.28 W/g (Rated), 10.38 W/g (Maximum)
- Motor Diameter: Ø 37 mm
- Motor Length: 32.90 mm
- Shaft Diameter: Ø 12 mm
- Stator Poles: 12S
- Magnetic Poles: 14P
- Bearings: Dual 685-zz
- Inductance per phase (Winding Inductance): 0.026 (≈0.03) mH
- Resistance per phase (Rph): 0.045 (≈0.03) Ω
- Motor Mount Pattern @ 90°: 4 × M3 @ PCD Ø 19 mm, depth: 3 mm
- Compatible Propeller Size: 7" to 10"
- Propeller Mount Pattern: M5, depth: 10 mm
Test Data - 900 KV
VT 1050-TRI BLADE GFN Propeller
Test Conditions:
- ESC: TM 60A 6S
- Battery: HWB - 22000 mAh 6S
- Test Date: 13-12-2025
- Environmental Temp: 28°C
- Humidity: 40%
- Cross-winds: Mild
| PWM | Throttle % | Voltage (V) | Current (A) | RPM | Thrust (g) | Torque (N·m) | Power (W) | Efficiency (g/W) | Temp (°C) |
|---|---|---|---|---|---|---|---|---|---|
| 1300 | 30 | 24.89 | 4.74 | 6545 | 629 | 0.115 | 118.0 | 5.3 | 50°C (@70% 10 min Constant) |
| 1400 | 40 | 24.75 | 8.99 | 7677 | 877 | 0.158 | 222.5 | 3.9 | 50°C (@70% 10 min Constant) |
| 1500 | 50 | 24.62 | 12.73 | 8903 | 1193 | 0.215 | 313.4 | 3.8 | 50°C (@70% 10 min Constant) |
| 1600 | 60 | 24.42 | 18.32 | 9986 | 1497 | 0.277 | 447.4 | 3.4 | 50°C (@70% 10 min Constant) |
| 1700 | 70 | 24.20 | 24.67 | 10812 | 1787 | 0.330 | 597.0 | 3.0 | 50°C (@70% 10 min Constant) |
| 1800 | 80 | 23.96 | 31.64 | 11515 | 2046 | 0.383 | 758.1 | 2.7 | 60°C (Maximum) |
| 1900 | 90 | 23.71 | 39.37 | 12205 | 2270 | 0.423 | 933.5 | 2.4 | 60°C (Maximum) |
| 1950 | 95 | 23.57 | 43.57 | 12508 | 2388 | 0.447 | 1026.9 | 2.3 | 60°C (Maximum) |
| 2000 | 100 | 23.37 | 50.23 | 12913 | 2586 | 0.486 | 1173.9 | 2.2 | 60°C (Maximum) |
Performance Summary:
- Best Efficiency: VT 1050-TRI @ 30% throttle (5.3 g/W, 629g thrust)
- Maximum Thrust: VT 1050-TRI @ 100% throttle (2,586g thrust, 2.2 g/W)
- Balanced Performance: VT 1050-TRI @ 50% throttle (3.8 g/W, 1,193g thrust)
- Operating Temperature: 50-60°C depending on load
- Recommended Continuous: 70% throttle max for sustained flight
Recommended Applications - 900 KV
- 7" to 10" Long-range FPV drones
- Cinematic FPV platforms
- High-speed chasing applications
- Mid-to-heavy freestyle FPV
Common Resources
2D CAD Drawing
The 2D CAD drawing provides detailed dimensions and mounting specifications for the 3115 SL motor.
Drawing Specifications:
- Motor Mount Pattern @ 90°: 4 × M3 @ PCD Ø 19 mm, depth: 3 mm
- Propeller Mount Pattern: M5, depth: 10 mm
- Motor Diameter: Ø 37 mm
- Motor Length: 32.90 mm
- Stick Out Shaft Diameter: Ø 12 mm
Note: All dimensions in millimeters (mm). Specifications and drawings may be revised without notice.
Recommended ESC & Propeller
Compatible ESCs
Recommended Configurations:
| ESC Rating | Application | Features |
|---|---|---|
| 40A | General purpose | Standard BLHeli_32 |
| 60A+ | High performance | Advanced telemetry, 4-in-1 capable |
ESC Requirements:
- Continuous rating: 40A minimum (60A recommended)
- Voltage support: 4S-6S (16-25V) capable
- Protocol: DShot600 or higher recommended
- Features: Active braking, telemetry support
For detailed ESC specifications and compatibility, see ESC Overview.
Compatible Propellers
Tested Propeller Configurations:
| Propeller Size | Pitch | Application | Performance |
|---|---|---|---|
| VT 1050-TRI | Medium | Balanced performance & efficiency | Excellent |
Propeller Selection Guidelines:
- Use 7" to 10" triblade propellers for best balance of efficiency and thrust
- Always check for propeller clearance on your FPV frame
- Ensure M5 locknuts are fully secured before flight
For more propeller options, see Propeller Overview.
System Integration
Complete System Recommendations:
-
Efficiency Build (Long-range cruising)
- Motor: 3115 SL 900KV
- Propeller: VT 1050-TRI
- ESC: 40A Individual or 4-in-1
- Battery: 6S Li-Ion or LiPo
- Expected Performance: Excellent cruising efficiency at lower throttle
-
Performance Build (Cinematic/Freestyle)
- Motor: 3115 SL 900KV
- Propeller: VT 1050-TRI
- ESC: 60A+ 4-in-1
- Battery: 6S LiPo
- Expected Performance: High thrust bursts up to 2,586g per motor
Maintenance and Inspection
Pre-Flight Checks
Before every flight:
- Visual inspection for physical damage
- Propeller balance and condition check
- Mounting bolt security verification (M3 bolts)
- Locknut security on M5 shaft
- Brief spin test (listen for unusual sounds)
Periodic Maintenance Schedule
Every 10 Flight Hours:
- Re-torque mounting bolts to specification
- Check bearing smoothness (manual rotation)
- Clean motor exterior with compressed air
- Inspect propeller for wear or damage
Every 50 Flight Hours:
- Detailed bearing inspection
- Electrical connection integrity check
- Replace propeller if worn
Signs Requiring Immediate Inspection:
- Unusual vibration during operation
- Increased motor temperature (>60°C)
- Grinding or scraping sounds
- Reduced thrust output
- Propeller wobble
Bearing Replacement
Bearing Specifications:
- Type: Dual 685-zz
- Service Interval: 100-150 flight hours (typical)
Signs of Bearing Wear:
- Grinding or rattling sounds
- Increased vibration
- Shaft play or wobble
- Difficulty rotating by hand
- Increased operating temperature
Safety Notes
⚠️ Important Safety Information
Operational Safety:
- Never run motor without propeller attached for extended periods
- Ensure proper cooling during operation
- Monitor motor temperature - do not exceed 60°C for sustained periods
- Inspect motor bearings regularly for wear
- Replace damaged propellers immediately
Electrical Safety:
- Verify correct ESC wiring before first power-up
- Use only 4S-6S LiPo batteries (16-25V range)
- Do not exceed maximum continuous current (24A @ 180s)
- Ensure proper battery discharge rates (C-rating)
Installation Safety:
- Follow torque specifications exactly
- Never exceed maximum bolt depth (3mm for motor mount)
- Maintain adequate clearance to frame
- Use proper size mounting hardware (M3 for frame, M5 for propeller)
Emergency Procedures:
- If motor overheats (>60°C), land immediately
- If unusual vibration occurs, stop operation
- If motor makes grinding sounds, inspect bearings
Technical Support & Resources
Contact Information
- Technical Support: support@vectortechnics.com
- Phone Support: +918977744819 (Mon-Fri, 9AM-5PM IST)
Related Documentation
Next Steps:
- Review Installation Guide for mounting procedures
- Select compatible ESC from tested configurations
- Choose optimal propeller based on application
- Review Motor Overview for system integration
Document Information:
- Revision: 1.0
- Last Updated: August 2026
- Product Code: VT-3115SL-900KV
- Document ID: VT-DOC-3115SL-01
Note: Specifications and drawings may be revised without notice. Vector Technics assumes no liability for reliance on unverified data. All dimensions in millimeters (mm).