XOAR PJA 9x4 9 Inch 2-Blade Beechwood Propeller for Gas RC Airplanes (Tractor)

The XOAR PJA 9x4 is a 9-inch diameter, 4-inch pitch, 2-blade tractor propeller made from premium beechwood. Weighing 15 grams with a 5mm shaft bore, it is designed for 3.5 to 5cc gasoline engines used in fixed-wing RC planes like gliders, warbirds, and aerobatic models. This propeller is pre-balanced and manually finished to reduce vibration and improve performance.

What Makes the XOAR PJA 9x4 Propeller Different?

Unlike mass-produced propellers, the XOAR PJA starts with carefully selected Grade A beechwood. The wood is sourced for consistent moisture content and physical properties like elongation and breakpoint resistance. A CNC digital imaging process shapes each blank to an advanced airfoil design. After machining, skilled craftsmen hand-finish every propeller to achieve a smooth surface and both horizontal and vertical balance. This manual step is one reason XOAR propellers stand out from competition.

Two layers of primer and two layers of glossy protective coating are applied to prevent corrosion from fuel and handling. Each propeller is individually balanced at the factory, and random batches undergo dynamic balance, RPM, and noise tests before packaging. However, external factors like temperature and transit can affect balance, so final balancing before flight is recommended.

Dimensions and Specifications

Which RC Airplanes Suit This Propeller?

The 9x4 size and tractor configuration work well with small to medium fixed-wing planes powered by 3.5–5 cc gas engines. It is commonly used on gliders, flying wings, delta wings, warbirds, and aerobatic models from brands like FMS, Hangar 9 XCub, Top Flite Giant, E-flite, and Parkzone. Because it is a tractor propeller, it mounts at the front of the plane and pulls the aircraft forward.

This propeller is not suitable for electric motors or larger engines above 5 cc unless specified by the manufacturer. Always match the propeller diameter and pitch to your engine’s operating range for safe and efficient flight.

Frequently Asked Questions

What is the difference between a tractor and pusher propeller?

A tractor propeller pulls the aircraft forward by facing the front. A pusher propeller faces rearward and pushes the plane. The XOAR PJA 9x4 is a tractor type, designed for conventional front-mounted engines.

Does the propeller need to be balanced before use?

Each XOAR PJA propeller is pre-balanced at the factory, but it is still a good practice to check balance before installation. Handling, temperature changes, and transit can alter the balance. The propeller wood and coating may dry or absorb moisture over time, so periodic rechecking is wise.

Can I use this propeller on a nitro or electric plane?

This propeller is specifically designed for gasoline engines from 3.5 to 5 cc. Using it on nitro or electric setups could cause excessive vibration or suboptimal performance because those engines have different torque and RPM ranges. Always follow the engine manufacturer’s recommendations.

What makes beechwood a good material for propellers?

Beechwood is dense, stiff, and absorbs vibration well compared to many other woods. It can be shaped precisely and holds an edge well. XOAR selects Grade A beechwood and treats it through a heating process to minimize distortion and elongation, ensuring consistent performance between propellers.