[AR] Re: Dynamic stability in supersonic rockets
- From: Mike Caplinger <mc@xxxxxxxx>
- To: arocket@xxxxxxxxxxxxx
- Date: Tue, 16 Nov 2021 08:41:02 -0800
On 11/16/21 8:30 AM, William Claybaugh wrote:
Looking at your posted image and your description, I would first guess
that the rocket had a structural failure just above the motor which
failure proceeded first as an offset of the top of the rocket wrt to
bottom
I've had a number of structural failures ("shreds" in HPR parlance) in
this exact area on extreme flights. Obviously it's a weak point, but
it's never been clear to me if it was the root cause of the shred or an
effect of instability. I also usually see a slow ramp-up in lateral
acceleration (the Raven has a two-axis accelerometer with the lateral
normal to the velocity vector) right before the shred which is not
consistent with a lot of coning, but I've never had three-axis
orientation data on these flights.
I looked at an aeroelastic resonance as a possible cause but it didn't
seem like a viable hypothesis.
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