On September 23, 2023, I attended the ERC rocket launch in Calmar with two rockets.
The Black Tusk DD is simply my BT-80 rocket, fitted out for dual deployment. Flying on a CTI Pro29 G83, it reached an altitude of 1101 ft, recorded by an EasyMini altimeter. The drogue deployed properly, but the main stuck in the upper airframe. The rocket was recovered in good shape.
The Highlander 29 DD is my original Highlander 29, also fitted out for dual deployment. Flying on an Aerotech G80, it reached an altitude of 708 ft, recorded by a StratologgerCF altimeter. This rocket also was recovered in good shape.
Both of these rockets were my first attempts at dual deployment, using an altimeter bay to deploy a drogue parachute at apogee, and the main parachute at a specified lower altitude. The purpose of dual deployment is to limit the rocket’s drift, so that old rocketeers like me don’t have to walk as far to recover the rocket!