How to Install the 6.0" Carbon Coupler Long

Quick Answer

To install the 6.0" Carbon Coupler Long, prepare the airframe ends, dry-fit the coupler, apply epoxy evenly, and slide it into place with a twisting motion, then align and clamp until cured.

Step-by-Step Installation

1. Prepare the work area and parts: Lay out all materials: the coupler, the two airframe tubes, epoxy, mixing sticks, a brush or spreader, and clamps. Clean the inside of the airframe ends and the outside of the coupler with isopropyl alcohol to remove any dust or oils. Let them dry completely. Check that the coupler slides into both airframe tubes without excessive force before applying epoxy.
2. Dry-fit and mark alignment: Insert the coupler into one airframe tube to the desired depth (typically half the coupler length). Use a pencil to mark the tube at the coupler's end. Repeat for the other tube. This ensures you know how far to insert the coupler and helps you align the tubes later. Make sure the marks are clearly visible and match the coupler's actual insertion depth.
3. Mix epoxy thoroughly: Mix a sufficient amount of structural epoxy according to the manufacturer's instructions. Stir slowly and thoroughly for at least two minutes, scraping the sides and bottom of the mixing cup to ensure a uniform mix. Use a timer to track the pot life. Do not mix more than you can use within the working time; leftover epoxy will harden in the cup.
4. Apply epoxy to the coupler: Using a brush or spreader, apply a thin, even layer of epoxy to the outside of the coupler over the entire area that will be inserted into the airframe. Avoid applying too much, as excess will squeeze out and create a mess. Ensure full coverage, but keep the layer thin to prevent drips and uneven bonding.
5. Insert the coupler into the first airframe tube: Slide the coupler into the first tube up to your alignment mark. Use a twisting motion to distribute the epoxy evenly. Wipe away any excess epoxy that squeezes out at the joint. Check that the coupler is fully seated to the mark and that the tube is square to the coupler.
6. Attach the second airframe tube: Apply epoxy to the exposed portion of the coupler (if not already coated) and slide the second tube over it, again using a twisting motion until it reaches the other mark. Ensure both tubes are aligned—rotate them so any fin slots or markings line up as needed. Verify the overall length matches your design and that the joint is straight; adjust before the epoxy sets.
7. Clamp and let cure: Use clamps or tape to hold the joint securely while the epoxy cures. Follow the epoxy's recommended cure time, typically 24 hours for full strength. Do not move the assembly during curing. After curing, inspect the joint for any gaps or excess epoxy; sand smooth if necessary.

Product Facts

• 6.0" Carbon Coupler Long: The 6.0" Carbon Coupler Long is 14.75" long and fits any 6.0" PML Carbon Airframe. This extra length provides a larger bonding surface, which increases joint strength and helps maintain alignment between airframe sections.