Gemfan 1238 Carbon Fiber Nylon Propellers - 12x3.8 Inch CW+CCW Pair

Specifications

• Diameter: 12.0 Inch (304.8mm)

• Pitch: 3.8 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)

• Hub Thickness: ~9.5mm

• Weight: ~22g per propeller (~44g per pair)

• Recommended Motors: 2814, 3508, 4108 (500KV - 800KV)

Key Applications & Projects

• F550/F650 Multi-rotors: The ideal upgrade for mid-to-large hexacopters and quadcopters.

• Professional Cinematography: Provides the smooth, high-torque lift needed for heavy camera gimbals.

• Long-Endurance Surveillance: Stiff blades improve efficiency during long-duration hovering and cruising.

Unlock New Capabilities (Project Evolution)

• Feature Upgrade: Switching from 10-inch or standard 12-inch plastic props to the 1238 Carbon Nylon variant often yields a hovering stability increase of up to 20%, making the aircraft much more predictable in light winds.

• Effort Level: Beginner. Each pair includes a universal "adapter tree" to ensure a precise fit on motor shafts ranging from 3mm to 8mm.

Package Includes:

• 1 x Gemfan 1238 Clockwise (CW) Propeller
• 1 x Gemfan 1238 Counter-Clockwise (CCW) Propeller
• 2 x Sets of Adapter Rings (Standard sizes: 3mm, 3.17mm, 4mm, 5mm, 6mm, 8mm)

FREQUENTLY ASKED QUESTIONS (FAQ)

1. What does "1238" stand for? "12" is the diameter in inches; "38" is the 3.8-inch pitch.

2. Will these fit my 2212 920KV motors? No. 12-inch props will likely overheat 2212 motors. Use them with 28mm to 40mm diameter motors (500KV–800KV).

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

4. Are they better than 1245 props? 1238 props are "Slow Fly" optimized, offering more stability for hovering, while 1245 props offer a bit more top speed.

5. How do I tell CW from CCW? The CW prop rotates clockwise (from top) to push air down; the CCW rotates counter-clockwise.

6. Can I use these with 6S batteries? Yes, as long as your motor/ESC combo is rated for 6S with a 12-inch propeller.

7. Do they come with adapter rings? Yes, universal 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 SKU includes 1 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, those require proprietary self-tightening hubs.

14. Is the 3.8 pitch too low? It is optimized for high static thrust (lifting), which is ideal for multi-rotors.

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

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

17. Are they suitable for FPV racing? No, these are designed for stability and efficiency on larger drones.

18. What happens if I install them backward? Your drone will push air up and fail to lift. Markings/Logo should face the sky.

19. Can I use them for a tractor-style plane? Yes, they provide excellent static thrust for slow-fly electric planes.

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