Modular Motor Adaptor for 7.5" V2: Install Guide

Quick answer

Install the Modular Motor Adaptor for the 7.5" V2 by dry-fitting all parts, then epoxy the motor tube and centering rings permanently, or keep the adaptor removable for future motor changes.

Installation steps

1. Dry-fit all components: Slide the motor tube, centering rings, and forward adaptor ring into the 7.5" V2 airframe without glue. Mark the exact position of each ring on the motor tube with a pencil. Common mistake: skipping dry-fit leads to misaligned rings that prevent the nose cone from seating. Check that all parts slide freely and the forward adaptor ring sits flush against the airframe shoulder.
2. Prepare epoxy and apply to rings: Mix a slow-curing epoxy (30-minute or longer working time). Apply a thin, even coat to the inside of each centering ring where it contacts the motor tube, and to the outside where it contacts the airframe. Common mistake: using too much epoxy causes drips that block the motor tube or interfere with the forward adaptor ring. Wipe away excess epoxy immediately with a paper towel before it cures.
3. Insert and align the motor tube assembly: Slide the motor tube with epoxy-coated rings into the airframe, using your pencil marks as a guide. Rotate the tube to spread epoxy evenly. Common mistake: not aligning the forward adaptor ring square to the airframe; a tilted ring prevents the nose cone from locking. Use a straightedge across the airframe opening to verify the forward ring is level before the epoxy sets.
4. Secure the adaptor (permanent or removable): For permanent installation, apply a fillet of epoxy around each centering ring where it meets the airframe. For removable installation, leave the forward adaptor ring unglued and secure it with a single screw or friction fit. Common mistake: epoxying the forward ring when you intended a removable setup, making future motor swaps impossible. Double-check your installation plan before the epoxy reaches its working limit.

Product fact

• Modular Motor Adaptor for 7.5" V2: Designed to work with PK-100 7.5" V2 Rocket Kit. Completely removable or able to be epoxied in permanently. Available in 3x38mm, 1x38mm, 1x54mm, and 1x75mm configurations. You can choose the motor tube cluster that matches your planned motor size, and decide later whether to make the mount permanent.