Yep. Seriously cool and froody.You really know where your towel is!
The other thing I noticed over the weekend is that quite a lot of the 2 stages that had three fins on the booster started to corkscrew a second or two into the flight. I have no idea why.. but.. if I need to build another booster stage, then I am definately looking at a 4 fin booster.
This is known as coning (or inertia coupling) and can be caused by a variety of factors such as off-center motor cores, or off-axis mass in the rocket. I suspect many of the sustainers you saw were flying on longburn or moonburner motors, which often have a c-slot or moonburner grain geometry. This can lead to thrust asymmetry, which can then lead to coning. Four fins can help eliminate coning to a degree, but it's still something to design for and consider, especially if you're flying a longburn motor.
making a long story short... electronics problem.
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