Master Airscrew 7x4 3-Blade RC Propeller (CCW) with Adapter Rings
Master Airscrew 7x4 3-Blade RC Propeller (CCW) with Adapter Rings
The Master Airscrew 3-Blade 7x4 Performance Propeller is a glass-fiber reinforced composite propeller built for RC model airplanes. It measures 7 inches in diameter with a 4-inch pitch, rotates in a normal/tractor/CCW direction, and weighs just 0.39 oz (11.1 g). The hub fits a 1/4-inch shaft and includes six adapter rings to accommodate smaller shafts, making it versatile for many motor types.
Propeller Dimensions and Fit
| Diameter | 7 in (178 mm) |
| Pitch | 4 in (102 mm) |
| Hub thickness | 5/16 in (7.9 mm) |
| Shaft diameter (hub bore) | 1/4 in (6.35 mm) |
| Weight | 0.39 oz (11.1 g) |
| Rotation | Normal / Tractor / CCW |
| Material | Glass-fiber reinforced composite |
What Shaft Diameters Does This Propeller Support?
The propeller includes six adapter rings to fit different motor shafts. The bag contains rings for: 1/8 in, 3/16 in, 5/16 in, 4 mm, 5 mm, and 6 mm. To install, select the ring that matches your motor shaft, attach it to the propeller hub, then slide the shaft into the ring and secure it. Make sure the motor rotates in the same direction as the propeller (CCW when viewed from the front for a tractor configuration).
Built for Performance and Quiet Operation
The three-blade design gives your model a scale look while providing efficient thrust. Made from glass-fiber reinforced composite, this propeller is built to handle both electric motors and gas or glow engines. It combines strength with light weight, helping reduce vibration and noise. Many hobbyists choose Master Airscrew propellers for their consistent quality and quiet running.
About Master Airscrew
Master Airscrew has designed and manufactured model airplane propellers for more than 45 years. Based in California, USA, they focus on precision and durability. Their propellers are used by experienced flyers worldwide.
Common Questions About This Propeller
Is this propeller for electric or gas engines?
It works with both. The glass-fiber composite material is suitable for electric motors and also stands up to the heat and vibration of glow or gas engines.
What adapter rings are included?
The set includes six rings: 1/8 in, 3/16 in, 5/16 in, 4 mm, 5 mm, and 6 mm. This allows the propeller to fit many common motor shaft sizes.
How do I check the rotation direction?
The propeller is marked as CCW (counter-clockwise) when viewed from the front of the aircraft, which is the standard tractor rotation for most models. Verify that your motor turns the same way before flying.