Propeller Calculator — Prop Matching

The first number is the diameter in inches and the second is the pitch in inches. A 10x6 prop is 10 inches diameter with a 6-inch pitch. Pitch means the theoretical distance the prop would move forward in one revolution, like a screw thread.

Match the prop to your motor. Low KV motors (below 1000) suit larger, lower-pitch props (12x6, 14x7). High KV motors (2000+) suit smaller, higher-pitch props (6x4, 7x5). The motor specification sheet will list recommended prop ranges.

Tip speed is how fast the propeller tips travel through the air. Above Mach 0.5 (170 m/s), efficiency drops and noise increases significantly. Above Mach 0.7, compressibility effects cause major efficiency loss. Keep tip speed below Mach 0.5 for best results.

Larger diameter gives more thrust at lower speeds — good for climbing and hovering. More pitch gives more speed at the cost of thrust. Trainers and 3D planes favour large diameter, low pitch. Speed models favour smaller diameter, higher pitch.