Mainly Props — J Perkins

Diameter (inches)

×

Pitch (inches)

Direction

Blades

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Electric

Brushless motors

IC / Petrol

Glow & petrol

Multirotor

Drones & quads

EDF

Fan units & blades

Folding

Gliders & sailplanes

Marine

Boats & ships

Wooden

Traditional kits

Sport / Speed

High pitch for speed. Generates less thrust per watt but top speed is higher. Matched to high-KV brushless motors in fast fixed-wing and racing cars.

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Efficiency

Larger diameter, moderate pitch. Moves more air per revolution — better for trainers, gliders, and models where flight time matters more than speed.

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Scale / 3D

Matching scale appearance or optimised for low-speed hover and 3D manoeuvres. Wider chord, more thrust at slow forward speed.

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IC / Glow

Wood or composite blades for nitro and petrol engines. Engine torque curve differs from electric — IC props have different pitch/diameter ratios.

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Reading the labels

More thrust

Pitch-to-diameter ratio ≤ 0.55. Strong pull and climb. Easier on motors — good for beginners, heavy models, and slow flyers.

e.g. 10×4.7, 11×5

Balanced

Ratio 0.56–0.75. The general-purpose sweet spot — decent speed and pull with good motor efficiency.

e.g. 10×6, 9×6, 8×5

Cruise / sport

Ratio 0.76–0.90. More top speed, still versatile. Suits fast fixed-wing and sport models with capable motors.

e.g. 8×6, 7×6

More speed

Ratio > 0.90. Maximum airspeed. High pitch loads the motor harder — only suited to powerful drive systems.

e.g. 6×6, 5×5.5

Higher load

Appears alongside any primary label when pitch ratio, blade count (3+), or both suggest the motor will work significantly harder.