Now this is a fun rocket, 8 fins total. 4 main fins and then 4 more fins with whistler tubes on them.
The idea is that during thrust the air gets thrust though the whistle tubes blowing them. All 4 whistles sound and it "screams" all the way up.
In reality you can't hear them over the motor burn but after motor burn out you can hear them for a little bit until the parachute deploys. It's a fun one that the kids like.
Built 3-1-03
Diameter 1.64", Length 25.5", and Weight 5.3 oz. 24mm motors and parachute recovery.
Lifting off on a D12-5
Under boost.