Fiala Prop Wooden 20x10P 2-blade natural propeller

Fiala Prop Wooden 20x10P 2-blade natural propeller

The Fiala Prop Wooden 20x10P 2-blade natural propeller is a highly specialized, competition-grade wooden airfoil manufactured in the Czech Republic by Fiala Propellers. Distinct from conventional layouts, the “P” designation explicitly identifies this as a Pusher (Reverse Rotation) propeller. It is engineered specifically for giant-scale gasoline RC aircraft utilizing a rear-engine pusher configuration or for twin-engine models requiring counter-rotating props to cancel out engine torque steering effects. Built to manage the sharp, high-amplitude power pulses of 30cc to 40cc gasoline engines, this 20-inch wood blade combines classic natural aesthetics with high-grade European mechanical balancing.

The Crucial “P” (Pusher / Reverse Rotation) Engineering

When looking at an aircraft from the front facing the cockpit, a standard tractor propeller rotates counter-clockwise (CCW) to pull the aircraft forward. In contrast, the Fiala 20x10P Pusher propeller features an inverted airfoil pitch orientation designed to rotate clockwise (CW) to generate forward thrust. This reverse-pitch configuration allows pilots to mount standard gasoline engines backward—such as on flying wings, canard-style aircraft, or scale replica pusher planes (e.g., the Wright Flyer or various UAV platforms)—without needing to physically reverse the internal mechanical rotation of the engine’s crankshaft.

Precision Airfoil Carving and Factory Balancing

Rear-mounted pusher engines operate in inherently turbulent, “dirty” air trailing behind the fuselage or wings. To minimize structural drag and vibrations under these conditions, Fiala propellers are carved on precise multi-axis CNC machinery from premium, hand-selected German Beechwood. This manufacturing guarantees absolute dimensional symmetry across both blades. Every single propeller undergoes rigorous static and dynamic factory balancing before being finished, protecting your rear engine’s front crankshaft bearings from premature wear and smoothing out complex mid-range throttle transitions.

Key Features

• Explicit “P” Type (Pusher / Clockwise CW Rotation) design optimized for rear-engine installations.

• Premium European hardwood construction delivers excellent structural rigidity under heavy G-loads.

• Optimized 20-inch diameter with a 10-inch pitch profile tailored for 30cc–40cc gasoline engines.

• Factory pre-balanced to prevent high-amplitude harmonic resonance through the airframe.

• Coated in a fuel-proof, high-gloss transparent varnish to resist oil and gas staining.

• Low rotational mass enables crisp throttle tracking and rapid RPM acceleration curves.

• Features a standard 10mm pilot shaft hole, easily reamed for custom multi-bolt hubs.

• High-efficiency 2-blade geometry maximizes static thrust and top-end airspeed performance.

Aerodynamic Efficiency and Protective Finishing

Large-scale RC aircraft demand a rigid propeller that maintains its true pitch shape under heavy flight loads and aggressive snapping maneuvers. Unlike composite plastic or nylon blades that flex and lose efficiency under high load, the dense wooden structure of the Fiala 20x10P prop remains completely rigid. This gives pilots highly predictable vertical climbing power and excellent aerodynamic braking performance during steep descents. To shield the wood fibers from the elements, each prop is sealed in a specialized, fuel-resistant clear lacquer. This transparent varnish highlights the natural wood grain while shielding the core from raw gasoline, exhaust residue, and field humidity.

Technical Integration and Safety

Investing in authentic Fiala hardware ensures exceptional mechanical safety buffers for giant-scale aircraft. The prop features a standard $10\text{ mm}$ center shaft pilot hole, which can be custom-drilled using a precision propeller guide to match standard multi-bolt gas engine hubs like DLE, DA, or OS Engines. Due to its lightweight wooden composition, it possesses significantly lower rotational inertia than equivalent carbon fiber or plastic blades, allowing your engine’s carburetor to track throttle changes rapidly without bogging down, giving you total control during critical low-altitude maneuvers.