Boyce Flip-Out-Fin Unit for BT-101 Tube spo-disabled it is easy to see

it is easy to see why this kit is named the Estes Rockets Hi-Flier XL Model Rocket

This Builders Kit also includes a detailed interstage with visible first state upper tank dome

Altimeter weighs

Our Honest John Fin Upgrade allows you to get rid of those wimpy vacuformed fins and replace them with these high-quality direct glue on replacements

Boyce Flip-Out-Fin Unit for BT-101 Tube spo-disabled it is easy to seeOur new Flip Out Fin Unit is used for creating two stage BT 101 models that don't have second stage fins. This is a perfect upgrade for making a two stage version of the Estes 1: 100 scale Saturn V. Our Flip Out Fin Unit is designed for use on scale or experimental rockets that have a BT 101 as a main body tube and that will use a single 24mm second stage motor. The unit is basically a glue in tube coupler that has 4 flip out fins that automatically