Du-Bro 10-867 - DU-BRO H/DUTY CNTRL HORN.40-91

Du-Bro - Heavy Duty Control Horn - .40-.91

The Du-Bro 867 Heavy Duty Control Horn is a robust control horn assembly used in radio-controlled (RC) aircraft to connect the control surface (like an elevator, rudder, or aileron) to the pushrod linkage from your servo. It's designed specifically for medium to large-sized models rated .40 to .91 cubic inch engine size, making it suitable for sport, scale, and aerobatic planes where stronger control hardware is needed.

Du-Bro control horns are typically constructed from durable materials that can withstand the forces exerted on larger control surfaces. The 867 uses a 6-32 x 1½" socket head cap screw as the mounting shaft, and the horn arm itself is about ¾" long (≈ 19 mm), providing solid leverage and clearance for linkage movement.

A control horn is a small but critical part of your model's control system: it transfers servo motion (rotary movement from the servo arm) into linear motion on the pushrod, which then changes the angle of the control surface. The Du-Bro 867 is a heavy duty version, meaning it's built to handle the greater loads seen on larger aircraft's surfaces without bending or introducing slop in the linkage.

For hobbyists upgrading or repairing aircraft, choosing a heavy duty horn like the Du-Bro 867 can improve durability and precision compared to lighter, economy horns. It provides better control feel and reduces the likelihood that control linkages will flex or fail under stress - especially important during aggressive maneuvers or higher speeds.