Gemfan 1147 Carbon Fiber Nylon Propellers - 11x4.7 Inch CW+CCW Pair

Specifications

• Diameter: 11.0 Inch (279.4mm)

• Pitch: 4.7 Inch

• Rotation: 1 x Clockwise (CW) + 1 x Counter-Clockwise (CCW)

• Material: Carbon Fiber Reinforced Nylon (Matte Black)

• Center Hole Diameter: 6.0mm (Universal Hub)

• Weight: ~17.5g per propeller (~35g per pair)

• Recommended Motors: 2216, 2810, 2814 (750KV - 1000KV)

Key Applications & Projects

• F550/S500 Builds: The primary upgrade for hexacopters and quadcopters in the 500-600mm class.

• Aerial Photography: Delivers the smooth, low-vibration lift needed for stable cinematic footage.

• Long-Range UAVs: Stiffer blades provide better aerodynamic efficiency for extended cruise missions.

Unlock New Capabilities (Project Evolution)

• Feature Upgrade: The "1147" profile is a "Slow Fly" (SF) style design, meaning it is optimized for high static thrust at lower RPMs—perfect for stable hovering and heavy lifting.

• Effort Level: Beginner. Includes a full "adapter tree" to ensure a perfect fit on motor shafts ranging from 3mm to 8mm.

Package Includes:

• 1 x Gemfan 1147 Clockwise (CW) Propeller

• 1 x Gemfan 1147 Counter-Clockwise (CCW) Propeller

• 2 x Sets of Adapter Rings (Sizes: 3mm, 3.17mm, 4mm, 5mm, 6mm, 8mm)

FREQUENTLY ASKED QUESTIONS (FAQ)

1. What does "1147" stand for? "11" is the diameter in inches; "47" is the 4.7-inch pitch.

2. Will these fit my 2212 920KV motors? Yes, but ensure your frame is large enough (500mm+) to clear 11-inch props without them hitting each other.

3. Are these original carbon fiber? They are a composite of carbon fiber and nylon, offering the best of both: the stiffness of carbon and the impact resistance of nylon.

4. Are they better than 1045 props? They provide more lift at lower RPMs, which can increase flight time if your motors are rated for 11-inch loads.

5. How do I tell CW from CCW? The CW prop rotates clockwise (from top) to push air down; usually marked with an "R" or "P".

6. Can I use these with 4S LiPo? Yes, provided your motor/ESC combo is rated for 4S with an 11-inch propeller.

7. Do they come with the center rings? Yes, universal adapter sets are included in every pair.

8. Will these help reduce video vibration? Yes, the stiffness minimizes blade flex, which is a major source of high-frequency vibration.

9. What is the raw center hole size? 6.0mm, adjustable via the included adapters.

10. How many props are in a pack? This is one pair (2 propellers total).

11. Do they need balancing? They are factory-balanced, but a manual check is always recommended for professional cinematography.

12. What is the color? Matte Black.

13. Will these fit a DJI Phantom? No, Phantoms require proprietary self-tightening hubs.

14. Is the pitch too high for hovering? No, 4.7 is the standard high-lift pitch for "Slow Fly" props of this size.

15. What is the hub thickness? Approximately 9.5mm to 10mm.

16. Can I ream the hole to 8mm? Yes, but use a prop reamer to ensure the hole remains perfectly centered.

17. Are they suitable for high-speed racing? No, these are designed for lift and stability on mid-to-large drones.

18. What happens if I install them backward? Your drone will push air up and fail to lift. The side with markings should always face the sky.

19. Can I use them for a pusher plane? Yes, they provide excellent static thrust for larger electric planes.

20. Is there a warranty? Standard manufacturing defect warranty applies.