Quick Answer

The AeroTech RMS-75 Tail Cone Aft Closure (75TAC) is a specialized motor hardware piece that reduces drag on minimum diameter rockets. Use it only with RMS-75 reload kits that have the large 01770 nozzle, and always verify compatibility before assembly.

Why Use a Tail Cone Aft Closure?

On a minimum diameter rocket, every bit of drag counts. The AeroTech RMS-75 Tail Cone Aft Closure replaces the standard aft closure to streamline the rear of the motor, reducing aerodynamic drag and potentially improving altitude performance.

However, this part is not universal. It is designed specifically for RMS-75 reload kits that use the large (01770) 75mm nozzle. If your reload kit uses a different nozzle, this closure will not fit correctly.

Compatibility Check: Know Your Nozzle

Before purchasing or installing the 75TAC, confirm that your reload kit includes the large 01770 nozzle. This information is usually printed on the reload kit label or in the instructions. Using the wrong closure can lead to unsafe assembly and motor failure.

Also note that high power RMS reload kits are not compatible with Mid Power RMS products. Even if the diameter looks similar, mixing hardware families is dangerous.

How to Fit the RMS-75 Tail Cone Aft Closure

  1. Confirm Nozzle Compatibility: Check your RMS-75 reload kit to ensure it uses the large (01770) 75mm nozzle. If not, stop and use the standard aft closure. Common mistake: assuming all RMS-75 reloads use the same nozzle.
  2. Gather Required Hardware: You will need the tail cone aft closure, the reload kit's nozzle, and the motor case. Motor reloads and other hardware are sold separately. Checkpoint: ensure you have all parts before starting assembly.
  3. Inspect the Closure and Nozzle: Visually inspect the tail cone closure and nozzle for any damage, burrs, or debris. Clean if necessary. Checkpoint: never assemble with damaged parts.
  4. Install the Nozzle into the Motor Case: Place the nozzle into the aft end of the motor case, ensuring it seats properly. Refer to your reload kit instructions for orientation. Common mistake: forcing the nozzle can damage the O-ring or seating surface.
  5. Thread the Tail Cone Aft Closure: Screw the tail cone aft closure onto the motor case threads. Tighten securely but do not over-torque; follow recommended torque values if available. Checkpoint: ensure the closure is snug but not stripped.
  6. Verify Fit with the Rocket Airframe: Dry-fit the motor assembly into your rocket's motor mount. The tail cone should align smoothly with the airframe, reducing any step or gap. Common mistake: ignoring fit issues can cause drag or instability in flight.

Product Facts

  • AeroTech RMS-75 75mm Tail Cone Aft Closure - 75TAC: For use with all AeroTech RMS-75 high power motor reload kits using the large (01770) 75mm nozzle ONLY. This ensures you only use the tail cone with compatible reload kits, preventing fitment issues and unsafe conditions.

    AeroTech RMS-75 75mm Tail Cone Aft Closure - 75TAC

    AeroTech RMS-75 75mm Tail Cone Aft Closure - 75TAC

  • AeroTech RMS-75 75mm Tail Cone Aft Closure - 75TAC: Useful for reducing drag on minimum diameter rockets. If you fly minimum diameter, this closure can help improve performance by streamlining the rocket's rear end.