140-Pattern Fixed-Wing Propeller 17x12.5N Narrow Blade - AP17125N by APC  [AP17125N]

This APC AP17125N 17x12.5N narrow blade propeller is a scale replacement sized for 140-pattern fixed-wing models. The reduced blade chord changes aerodynamic loading compared with wider blades, making it a practical choice for pilots adjusting thrust and RPM behaviour on sport and scale airframes.

Installation is straightforward for experienced modelers: confirm the spinner and prop adapter accept the 140-pattern mounting, fit the prop with the correct nut and washers for your motor shaft, and perform static and dynamic balance checks before flight. Apply standard safety checks when swapping props, including verifying thread direction, securing torque on the prop nut, and ensuring clearance for control surfaces and the spinner.

From a tuning perspective the narrower blade usually shifts the motor load toward higher RPM and reduces blade-induced drag at speed, which alters throttle response and climb performance. Use prop balancing and monitor motor and ESC temperatures as part of an iterative setup to find the best match for your airframe and flying style.