2505.5 1550KV / 1850KV Brushless Motor 4-6S with Titanium Shaft for 6-7 Inch FPV Drones

Overview

This 2505.5 Brushless Motor is built for 6 to 7 inch FPV drones, offering a perfect blend of power, stability, and durability. Available in 1550KV and 1850KV, this motor supports 4–6S LiPo voltage and features a titanium alloy shaft, high-temperature copper winding, and a 12N14P tile magnet configuration. Whether you're pushing long-range or freestyle flights, the 2505.5 motor delivers consistent thrust and reliable efficiency.

Key Features

• Available in two KV options: 1550KV (longer flight time) and 1850KV (stronger thrust)

• Titanium alloy shaft for high strength and reduced weight

• 12N14P tile magnet configuration ensures smooth and powerful output

• Single-strand high-temp copper wire for stable performance under load

• Extended 20AWG 200mm lead wires for flexible installation

• Ideal for 6 inch – 7 inch FPV freestyle or long-range drones

Specifications

What's Included

• 1 × 2505.5 Brushless Motor (KV value selected by option)

Note: Propeller and other accessories shown in the image are not included.

Application

This motor is perfectly suited for:

• 6 inch – 7 inch FPV drones

• Long-range quads requiring efficiency and endurance

• Freestyle setups demanding responsive throttle and durable structure

• DIY drone builders looking for high-efficiency 4–6S motors with reliable output

Recommended Setup

✅ ESC Recommendation:

• For 1850KV @ 4–6S:

  • 35A – 45A 4-in-1 ESC (BLHeli_32 or BLHeli_S)

  • Example: T-Motor F45A, SpeedyBee 50A BL32, Foxeer Reaper 45A

• For 1550KV @ 4–6S:

  • 30A – 40A ESC is sufficient

  • Example: Holybro Tekko32 F3 35A, iFlight SucceX 35A

✅ Battery Recommendation:

• 1850KV:

  • 4S 1300–1550mAh for freestyle (lightweight setup)

  • 6S 1100–1300mAh for racing or freestyle

  • 6S 1500–1800mAh for long-range endurance

• 1550KV:

  • 6S 1800–2200mAh for extended flight time

  • 6S 1500mAh for balance between agility and flight duration

Choose a high C-rate (≥75C) battery for maximum current output.

✅ Propeller Recommendation:

• 6 inch setups:

  • Gemfan 6042, DAL Cyclone T6045C, HQProp 6x4x3

• 7 inch setups:

  • HQProp DP 7x4.5x3 V1S, Gemfan 7040 Durable, Ethix S5 7x4

Use lightweight and balanced props for lower vibration and better efficiency. Ensure prop mounting hole is M5.

Two green 2505.5 brushless motors with 1550KV / 1850KV specifications, featuring gold accents and threaded shafts for model applications.

Brushless motor model 2505.5 with 1850KV rating, featuring green casing and copper windings.

Brushless motor dimensions: Ø16, Ø31.1, 30.9 length, 13.5 width, 8 height, M5 thread, 4-M3 holes. Specifications for 2505.5 1550KV / 1850KV model.

2505.5 1500KV brushless motor with green casing and copper coils, paired with black propeller blades for optimal performance.

Load performance data for 1850KV motor with 6032 and 6145 propellers. Includes throttle points, voltage, current, rotary speed, traction, power, and power efficiency metrics across various settings.

Performance data for 1850KV motor with 51477 and HQ6 propellers includes throttle points, voltage, current, speed, traction, power, and efficiency at various settings. For reference only.

Load performance data for 1550KV motor with propellers 6032 and 6145. Includes throttle points, voltage, current, rotary speed, traction, power, and power efficiency metrics across various settings.

Performance data for 1550KV motor with Propellers 51477 and HQ6, showing throttle, voltage, current, speed, traction, power, and efficiency at different settings. For reference only.