[AR] Re: dynamic stability
- From: "Troy Prideaux" <GEORDI@xxxxxxxxxxxxxxxx>
- To: <arocket@xxxxxxxxxxxxx>
- Date: Thu, 21 Aug 2014 09:51:03 +1000
Openrocket generates the graphs. Whether it's accepted or not I don't know.
Troy
>-----Original Message-----
>From: arocket-bounce@xxxxxxxxxxxxx [mailto:arocket-bounce@xxxxxxxxxxxxx] On
>Behalf Of Monroe L. King Jr.
>Sent: Thursday, 21 August 2014 9:27 AM
>To: arocket@xxxxxxxxxxxxx
>Subject: [AR] Re: dynamic stability
>
>There are no currently available programs (or popular for that matter)
>like you speak of. Rocksim Pro is the only viable program I know of
>unless you can name another that cost less than a grand.
>
>TAOS is not popular and has a learning curve that's pretty steep.
>
>So I have no Idea what you could be speaking about.
>
>There is no question here about CP or flight dynamics. It's about
>solving a very real problem of software available to solve a very real
>problem. A way to get certification for a real flight.
>
>Monroe
>
>> -------- Original Message --------
>> Subject: [AR] Re: dynamic stability
>> From: "Troy Prideaux" <GEORDI@xxxxxxxxxxxxxxxx>
>> Date: Wed, August 20, 2014 3:31 pm
>> To: <arocket@xxxxxxxxxxxxx>
>>
>>
>> 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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