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I am playing with simulations on a Wildman Blackhawk38 with CTI J394. I am using Open Rocket, as I have read on this forum that it is the best for stability calcs.
I am not well-versed in 6 DOF rocket flight dynamics, so bear with me. I am wondering if this is a problem or not:
1. Static stability margin = 2.75 calibers. Check. All is good.
2. Flight simulation with 15 mph wind. At launch rod clearance, AOA = 14 deg and stability margin = -1.0 calibers as shown in this picture.
Stability margin recovers very quickly and there are no other anomalies in the flight data.
Does this brief, negative stability off the launch rod have any any real meaning to worry about, or is it just a numerical thing? I think Barrowman's stuff was only good to 4 deg AOA. I also forced the simulation time step to 0.001 s if resolution is an issue, and I got the same result.
Thanks
I am not well-versed in 6 DOF rocket flight dynamics, so bear with me. I am wondering if this is a problem or not:
1. Static stability margin = 2.75 calibers. Check. All is good.
2. Flight simulation with 15 mph wind. At launch rod clearance, AOA = 14 deg and stability margin = -1.0 calibers as shown in this picture.
Stability margin recovers very quickly and there are no other anomalies in the flight data.
Does this brief, negative stability off the launch rod have any any real meaning to worry about, or is it just a numerical thing? I think Barrowman's stuff was only good to 4 deg AOA. I also forced the simulation time step to 0.001 s if resolution is an issue, and I got the same result.
Thanks