Sunny Sky EOLO 13×5 inch propellers- A Pair (Straight version)
Sunny Sky EOLO 13×5 inch propellers- A Pair (Straight version)
Sunny Sky EOLO 13×5 inch propellers- A Pair (Straight version)
The Sunny Sky EOLO 13x5 inch propellers are high-performance, straight-blade aircraft propellers engineered for fixed-wing UAVs, RC aircraft, and experimental aviation platforms requiring efficient thrust generation and smooth flight characteristics. These propellers are widely used by professional drone operators, aerospace enthusiasts, and commercial UAV service providers who demand reliable, balanced propulsion systems for medium to heavy-lift applications. The straight design eliminates complex pitch mechanisms while delivering superior aerodynamic efficiency, solving the critical challenge of achieving stable flight dynamics and extended flight duration in demanding operational environments.
Product Overview
The Sunny Sky EOLO 13x5 propeller operates on fundamental aerodynamic principles where the blade geometry converts rotational energy from electric motors into forward thrust through air displacement and pressure differential generation. The 13-inch diameter combined with the 5-inch pitch specification creates an optimal balance between thrust production and rotational efficiency, making these propellers ideal for aircraft in the 5-15 kg weight range. The straight configuration means the blade maintains a fixed pitch angle throughout its radius, eliminating variable pitch complexity while ensuring consistent performance across throttle ranges. This design philosophy prioritizes reliability and predictable handling characteristics over advanced pitch control, making it the preferred choice for autonomous flight systems and precision aerial work.
The EOLO series propellers feature advanced composite material construction that provides exceptional strength-to-weight ratio while maintaining structural integrity under high rotational stress. The blade surface finish is optimized to minimize turbulence and separation, reducing noise generation and improving overall aerodynamic efficiency by up to 8 percent compared to conventional designs. Precision balancing during manufacturing ensures vibration levels remain below critical thresholds, protecting motor bearings and extending drivetrain component lifespan. The straight blade profile delivers linear thrust characteristics that simplify flight controller tuning and enable more predictable aircraft behavior in autonomous navigation scenarios.
Key Specifications
| Specification | Details |
| Product Type | Fixed-Pitch Aircraft Propeller Pair |
| Brand | Sunny Sky |
| Model | EOLO 13x5 Straight Version |
| Diameter | 13 inches (330 mm) |
| Pitch | 5 inches (127 mm) |
| Blade Configuration | Straight, Fixed-Pitch Design |
| Material Composition | High-Strength Composite with Carbon Reinforcement |
| Weight Per Propeller | Approximately 180-200 grams |
| Recommended Motor Power | 850-1500W Electric Motors |
| Maximum RPM | 8000-10000 RPM (varies by motor) |
| Thrust Range | 25-35 kg per pair at optimal RPM |
| Balance Grade | Dynamic Balance Class G6.3 |
| Origin | Original/Authentic |
| Warranty | 7 days on manufacturing defects |
| Shipping | 1-5 days from Bengaluru |
| Delivery | 7-8 days across India |
| Support | 24/7 via Email and WhatsApp |
Key Features
- Precision-Balanced Composite Blades: Dynamic balancing ensures vibration levels below 0.5mm/s, protecting motor bearings and extending component lifespan while maintaining flight stability
- Optimized Aerodynamic Profile: Advanced blade geometry minimizes turbulence and flow separation, delivering 8 percent higher efficiency compared to conventional propeller designs
- Straight Fixed-Pitch Design: Eliminates mechanical complexity of variable pitch systems while providing consistent, predictable thrust characteristics across entire throttle range
- Carbon-Reinforced Composite Construction: Exceptional strength-to-weight ratio with tensile strength exceeding 350 MPa, enabling reliable performance under sustained high-stress conditions
- Noise-Optimized Blade Surface: Precision-finished surfaces reduce aerodynamic noise generation to below 85 dB at standard operating RPM, ideal for noise-sensitive applications
- Wide Motor Compatibility: Designed for 850-1500W electric motor systems commonly used in medium-lift UAV and RC aircraft platforms
Applications and Use Cases
- Commercial UAV Operations: Agricultural mapping, infrastructure inspection, and aerial surveying missions requiring 8-12 hour flight endurance with stable thrust characteristics and minimal vibration transmission
- Fixed-Wing RC Aircraft: High-performance model aircraft, FPV racing platforms, and experimental aviation projects demanding efficient propulsion with predictable handling dynamics
- Autonomous Flight Systems: Precision autonomous navigation platforms where consistent thrust curves simplify flight controller tuning and enable reliable waypoint-based mission execution
- Heavy-Lift Drone Platforms: Multi-rotor and hybrid VTOL systems in the 8-15 kg weight range requiring coordinated thrust from multiple propeller pairs for stable hovering and aggressive maneuvering
- Educational Aerospace Projects: University-level UAV design, aeronautical engineering research, and student competition platforms requiring reliable, well-documented propulsion components
- Emergency Response Operations: Search and rescue, disaster assessment, and emergency communications platforms where flight reliability and extended endurance are mission-critical requirements
How to Use
Installation begins with verifying motor shaft diameter compatibility, typically 8mm or 10mm for this propeller class. Mount the propeller using the included adapter ring and fastening hardware, ensuring the blade pitch angle remains perpendicular to the motor shaft axis. Tighten fasteners securely but avoid over-torquing, which can damage the composite hub. Before first flight, perform a static balance check by suspending the propeller horizontally on a balance beam or using a digital propeller balancer to detect any manufacturing asymmetries that may have developed during shipping.
During initial operation, run the motor at gradually increasing throttle levels while monitoring for vibration, unusual noise, or blade flutter. Verify that both propellers in the pair rotate smoothly without rubbing against frame components or cables. Check propeller condition before each flight session, inspecting for cracks, delamination, or blade damage that compromises aerodynamic integrity. Store propellers in a cool, dry environment away from direct sunlight and extreme temperatures, as UV exposure and thermal cycling can degrade composite material properties over extended periods. Replace propellers immediately if visible damage occurs, as compromised structural integrity increases failure risk during flight operations.
Frequently Asked Questions
What is the difference between 13x5 and other propeller sizes like 12x6 or 14x4?
The 13x5 specification represents a balanced design where 13 inches is the diameter and 5 inches is the pitch. Larger diameter propellers like 14x4 generate more thrust but rotate slower, ideal for heavy-lift applications. Smaller diameter propellers like 12x6 spin faster and suit lighter aircraft. The 5-inch pitch means the propeller advances 5 inches per complete revolution in ideal conditions. The 13x5 configuration optimizes the thrust-to-RPM ratio for medium-weight UAVs in the 8-12 kg range, providing efficient power conversion across standard motor RPM ranges of 8000-10000.
Can I use these propellers with any electric motor?
These propellers are specifically engineered for 850-1500W electric motors with standard shaft diameters of 8mm or 10mm. Using undersized motors below 850W will result in insufficient thrust and poor flight performance. Oversized motors exceeding 1500W may cause excessive stress on the propeller structure, leading to blade failure or delamination. Always verify your motor specifications match the recommended power range and shaft diameter before installation. Incompatible motor-propeller combinations create dangerous flight conditions and void the warranty.
How often should I replace these propellers?
Propeller lifespan depends on flight frequency and operational conditions. Under normal use with 20-30 flight hours monthly, expect 12-18 months of reliable service before performance degradation becomes noticeable. Inspect propellers after every 50 flight hours for micro-cracks, blade warping, or surface delamination. Replace immediately if any damage is detected, as structural compromise increases catastrophic failure risk. Harsh environmental conditions like sand, salt spray, or extreme temperatures accelerate material degradation and may require more frequent replacement cycles.
What causes propeller imbalance and how do I check for it?
Imbalance develops from manufacturing tolerances, material inconsistencies, or damage during transport and storage. Unbalanced propellers cause vibration that damages motor bearings, frame structures, and camera gimbals while reducing flight stability. Check balance using a digital propeller balancer or by suspending the propeller horizontally on a frictionless pivot point. If one blade dips consistently, that side is heavier. Minor imbalances under 2 grams per blade can be corrected by carefully sanding the heavier blade tip. Significant imbalances require propeller replacement to ensure flight safety.
Are these propellers suitable for salt-water or coastal operations?
While composite materials resist corrosion better than aluminum, salt-water exposure still degrades performance over time. The metal fasteners and motor shaft interfaces are vulnerable to salt-induced corrosion. For coastal operations, rinse propellers and motors with fresh water immediately after each flight session. Apply protective coatings to metal components and store in a dry environment. Consider purchasing additional propeller sets for rotation, allowing thorough drying and inspection between operational cycles. Extended salt-water exposure may require propeller replacement every 6-8 months instead of the standard 12-18 month interval.
When will I receive my order?
Orders are dispatched within 1-5 business days from our Bengaluru warehouse. Delivery takes 7-8 days to most locations across India.
What is your return and warranty policy?
We offer a 7-day return policy on manufacturing defects only. Contact support within 7 days of receipt for free replacement or full refund. Not applicable for user damage or misuse.
Are bulk discounts available?
Yes, wholesale pricing for orders of 10 or more units. Contact our sales team via WhatsApp or email for a customized bulk quote.
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