Main Shaft Set with Fixing Ring for YuXiang F112S AH-1 Cobra RC Helicopter

Eliminate Rotor Wobble and Restore Drive Mechanics

Even a microscopic bend in your main shaft can create severe high-frequency vibrations that confuse the onboard GPS sensors and cause unstable hovering or violent head shaking. For the YuXiang F112S 32:1 scale AH-1 Cobra, a perfectly true main shaft is vital to transfer brushless motor power smoothly to the rotor head. This replacement main shaft set solves the problem of power transmission loss and electronic stabilization glitches caused by a warped spindle, ensuring rock-solid flight stability.  Ships worldwide.

Product Highlights

• Premium Tempered Steel Shaft: Engineered from wear-resistant, high-strength stainless steel to handle high rotational torque and resist bending during hard impact.

• Flawless Machining & Alignment: Features precision-milled flat spots and pre-drilled holes for factory-perfect alignment with the swashplate and main gear.

• Integrated Fixing Ring System: Includes a heavy-duty aluminum shaft locking collar to eliminate vertical play and vertical slop in the main rotor housing.

• Industrial Grub Screw Included: Supplied with a high-tensile black set screw (grub screw) designed to lock the collar permanently to the shaft without backing out.

Compatibility

For the YuXiang F112S 9CH GPS RC Helicopter only.

Full model page (specs & photos):

https://kadstoylover.com/en-us/products/yuxiang-f112s-9ch-gps-rc-helicopter

What’s in the Box

• 1 x  YuXiang F112S Main Shaft Set

Install Tips

• Main Shaft Installation: Slide the steel shaft vertically down through the main bearings and the swashplate guide; ensure the pre-milled flat indentation faces the correct orientation for the collar lock.

• Fixing Collar Setup: Slide the aluminum fixing ring onto the designated alignment section of the shaft; compress it slightly against the bearing block to remove vertical play before tightening.

• Grub Screw Fastening: Always apply a drop of medium threadlocker (blue Loctite) to the small black grub screw before driving it into the collar flat spot to prevent it from loosening under high vibration.

• Vertical Tolerances Check: Once fully tightened, pull up and down firmly on the rotor head; there should be absolutely zero vertical slop or play, yet the entire assembly must rotate freely by hand.

More Spare Parts & Accessories

Support & Warranty

• 3-month warranty on manufacturing defects
• Ships worldwide