The 6 bladed R391 propeller for the C-27J aircraft incorporates advanced technologies developed by Dowty over the past 60 years and is certified to JAR-P. It offers the following benefits:
Advanced swept blade design
- Optimized ARAD-A aerofoil sections
- Excellent take-off and climb performance
- Very low noise levels
High integrity all-composite blades
- Over 30% lower system weight
- Highly effective erosion protection system
- Service proven, rugged construction
- Unmatched 25-year record of operational safety and reliability
Fail-safe electronic control system
- Precise speed selection and synchrophasing accuracy
- Counterweighted blades assure safe coarse-seeking operation
- Single lever cockpit control system
- Fully integrated with engine electronic control system
Low maintenance costs
- Modular configuration
- No mechanical linkages to cockpit
- Simple hub construction
- 50% lower parts count
Propeller Data
| Propeller and backplate |
Diameter: 13.5 ft (4.1 m) |
| Overspeed governor |
Activity factor: 128 per blade |
| Pitch control unit |
Tip sweep: 35° |
| Harnesses |
Aerofoil section: ARAD-A |
| Spinner |
Speed Control: ±1 rpm of selected rpm |
| De-icer timer |
Max rpm: 1020 |
| Beta tube assembly |
Cruise rpm: 1020 |
| Brush block bracket assembly |
Phase control: ±1° |
