[AR] Re: dynamic stability
- From: "Troy Prideaux" <GEORDI@xxxxxxxxxxxxxxxx>
- To: <arocket@xxxxxxxxxxxxx>
- Date: Thu, 21 Aug 2014 08:31:40 +1000
As I understand it, most of the currently available popular software programs
will provide you with it - how accurate they are for high mach numbers is
anyone's guess. I think it's primary about the shift in the cp over various
mach numbers and the software programs will generally tell you (for most
conventional rockets) that the cp will move forward with increasing mach
numbers which is generally the opposite to conventional fixed wing aircraft.
This cp shift has apparently caught many HPR flyers out who were pushing the
limits of acceleration and velocity flight profiles by transitioning from a
stable configuration to unstable even though the cg generally shifts forward
for typical solid propelled rockets.
Troy.
>-----Original Message-----
>From: arocket-bounce@xxxxxxxxxxxxx [mailto:arocket-bounce@xxxxxxxxxxxxx] On
>Behalf Of Carl Tedesco
>Sent: Thursday, 21 August 2014 7:46 AM
>To: arocket@xxxxxxxxxxxxx
>Subject: [AR] dynamic stability
>
>I am starting the process for getting a class 3 waiver for a rocket
>launch. Most of the FAA required documentation looks straight forward.
>One piece of information they require is "The dynamic stability
>characteristics for the entire flight profile." A static stability
>analysis is straight-forward, but I have never done a dynamic stability
>analysis.
>
>How have folks on this list addressed this requirement? Is this software
>driven analysis or just hand-calculations? Does anyone have an analysis
>they could share? If software analysis is the norm, can anyone point me
>to affordable software?
>
>--- Carl
>
>--
>Carl Tedesco
>Flometrics, Inc.
>5900 Sea Lion Place, Suite 150
>Carlsbad, CA 92010
>tel: 760-476-2770 ext. 515
>fax: 760-476-2763
>ctedesco@xxxxxxxxxxxxxx
>www.flometrics.com
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