In the (BT-55) 6th Observable, we had a rocket which greatly exceeded expected levels of performance in the category of altitude. .
Now we have a new iteration in work, this one with larger BT-60 fuselage and the same 3" ring fin and 24 mm motor mount. There are now only four fins instead of six, and in place of 1/8" balsa there are now built-up assemblies of polystyrene T-sections and flat PETG plastic sheets of 0.020" thickness. It has a payload section for the altimeter, and recovery is by conventional parachute.
Now we have a new iteration in work, this one with larger BT-60 fuselage and the same 3" ring fin and 24 mm motor mount. There are now only four fins instead of six, and in place of 1/8" balsa there are now built-up assemblies of polystyrene T-sections and flat PETG plastic sheets of 0.020" thickness. It has a payload section for the altimeter, and recovery is by conventional parachute.